1
00:00:00,000 --> 00:00:08,070

2
00:00:08,070 --> 00:00:10,430
>> R.J. Aquino: Ejja biss tibda.

3
00:00:10,430 --> 00:00:12,310
Allura dan huwa Quiz 1.

4
00:00:12,310 --> 00:00:14,890
Hawn xi informazzjoni ta 'livell għoli.

5
00:00:14,890 --> 00:00:19,915
Il-paġna About għall-kwizz huwa f'dan il-
URL, m'għadhiex CS50.net, għalkemm dan

6
00:00:19,915 --> 00:00:21,080
xorta se taħdem.

7
00:00:21,080 --> 00:00:26,920
Huwa CS50.harvard.edu/quizzes/2013/1.

8
00:00:26,920 --> 00:00:31,070
Hu l-big About paġna, tghidlek
fejn u meta, jiġifieri l-Erbgħa li jmiss

9
00:00:31,070 --> 00:00:32,100
fil-mazz ta 'kmamar.

10
00:00:32,100 --> 00:00:36,120
U sal-Erbgħa li jmiss, I
tfisser żewġ jum minn issa.

11
00:00:36,120 --> 00:00:37,890
Din l-informazzjoni hemm.

12
00:00:37,890 --> 00:00:39,110
Iżda huwa kumulattiv.

13
00:00:39,110 --> 00:00:43,790
>> Hekk kollox mill-ewwel nofs tas-
sena huwa potenzjalment fuq il-kwizz,

14
00:00:43,790 --> 00:00:50,780
għaliex inti ma tistax verament tagħmel avvanzat
affarijiet C mingħajr jekk il-kundizzjonijiet u

15
00:00:50,780 --> 00:00:51,920
għal-linji u simili.

16
00:00:51,920 --> 00:00:55,580
Imma se jkun hemm enfasi fuq il-
materjal kopert peress Quiz 0,

17
00:00:55,580 --> 00:00:59,570
jibda bl structs u File
I / O. Huwa tipikament aktar

18
00:00:59,570 --> 00:01:01,620
sfida minn Quiz 0.

19
00:01:01,620 --> 00:01:03,870
Il-punteġġ medju huwa tipikament aktar baxxi.

20
00:01:03,870 --> 00:01:05,980
Studju iebes.

21
00:01:05,980 --> 00:01:09,340
>> Filwaqt li int tistudja, ikunu żguri li jużaw
CS50/discuss biex wara l-mistoqsijiet tiegħek

22
00:01:09,340 --> 00:01:10,830
u aqra mistoqsijiet nies oħrajn.

23
00:01:10,830 --> 00:01:13,550
Mela jekk inti ma għandekx xi mistoqsijiet,
login u jaqraw

24
00:01:13,550 --> 00:01:14,580
mistoqsijiet ħbieb tiegħek ".

25
00:01:14,580 --> 00:01:16,560
Huma qed probabbilment mistoqsijiet tajba.

26
00:01:16,560 --> 00:01:17,730
U tieħu l-kwiżż prattika.

27
00:01:17,730 --> 00:01:20,750
Imxejna kien jagħti kwizzijiet għal
seba 'jew tmien snin issa.

28
00:01:20,750 --> 00:01:22,180
Huma qed kollha online.

29
00:01:22,180 --> 00:01:25,540
Mistoqsijiet futuri huma simili
għall-mistoqsijiet qodma.

30
00:01:25,540 --> 00:01:26,550
Thats kif nagħmlu minnhom.

31
00:01:26,550 --> 00:01:27,740
>> L-kwizz s'issa ma jeżistix.

32
00:01:27,740 --> 00:01:28,670
Xejn minna raw dan.

33
00:01:28,670 --> 00:01:32,496
Iżda se look like
kwizzijiet preċedenti.

34
00:01:32,496 --> 00:01:36,500
Għal din is-sessjoni reviżjoni, dan mhuwiex
lista eżawrjenti ta 'suġġetti.

35
00:01:36,500 --> 00:01:40,740
Inti ma tistax biss jattendu dan u mbagħad
jkun perfettament lest għall-kwizz.

36
00:01:40,740 --> 00:01:43,330
Inkella, ma jkunx
li ħafna ta 'kwizz.

37
00:01:43,330 --> 00:01:46,270
U dan huwa wkoll mhux neċessarjament
dak kollu li għandek bżonn tkun taf dwar kwalunkwe

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00:01:46,270 --> 00:01:46,970
mogħtija suġġett.

39
00:01:46,970 --> 00:01:50,520
Huwa maħsub biex jesponu li inti l-affarijiet
konna koperti, infakkarkom dak li aħna

40
00:01:50,520 --> 00:01:53,070
koperti, u l-mod
li aħna koperti minnha.

41
00:01:53,070 --> 00:01:57,030
Imma inti se jkollhom imorru ulterjuri u
aktar profonda meta inti tistudja biex double check-

42
00:01:57,030 --> 00:02:00,230
li inti taf kollox dwar kwalunkwe mogħtija
suġġett u li inti stajt mimlija

43
00:02:00,230 --> 00:02:03,320
-irkejjen kollha li kienu
koperti fil-lecture.

44
00:02:03,320 --> 00:02:07,980
>> In-noti kwizz jgħidlek biex tmur fil-
jinnota scribe, watch videos lekċers.

45
00:02:07,980 --> 00:02:10,155
Li l-mod tajjeb biex tagħmel żgur li int ħadthom
koperti bażijiet kollha tiegħek.

46
00:02:10,155 --> 00:02:12,670

47
00:02:12,670 --> 00:02:17,340
Allura jkollna beda, meta I magħmula dawn
slides, I ppruvaw li jpoġġi fejn sibt

48
00:02:17,340 --> 00:02:18,350
informazzjoni.

49
00:02:18,350 --> 00:02:22,890
Allura għal File I / O, per eżempju, Ġimgħa 7,
It-tnejn lecture, u l stazzjonati

50
00:02:22,890 --> 00:02:27,960
Taqsima 6 u Problem Set kollha għandhom
informazzjoni dwar File I / O. I ghamilt

51
00:02:27,960 --> 00:02:28,840
dan għal kull suġġett.

52
00:02:28,840 --> 00:02:33,010
Allura dawk slides titolu jista '
tkun utli għalik.

53
00:02:33,010 --> 00:02:38,950
>> Allura hawnhekk għandna File I / O. Ftakar, fil-
Problema Set 5, użajna fopen, fclose,

54
00:02:38,950 --> 00:02:41,210
fwrite, fread, u fseek.

55
00:02:41,210 --> 00:02:48,090
Wara li rkuprati 30ish JPEGs u
wara li tingħata daqs ieħor u messed ma

56
00:02:48,090 --> 00:02:50,320
bitmaps, inti għandek tkun pretty familjari
ma 'dawn il-funzjonijiet

57
00:02:50,320 --> 00:02:51,830
u kif jaħdmu.

58
00:02:51,830 --> 00:02:54,420
Jekk inti m'għadekx familjari,
definittivament jirreveduhom.

59
00:02:54,420 --> 00:02:56,860
U aċċerta ruħek li tifhem dak li
l-argumenti differenti huma,

60
00:02:56,860 --> 00:02:58,260
meta jkunu qed jintużaw.

61
00:02:58,260 --> 00:03:03,620
>> Iżda l-bugs relatati mal-fajl komuni
inti tista 'tiġi mistoqsi dwar -

62
00:03:03,620 --> 00:03:07,270
ukoll, jekk inti ħadthom minsija biex jiċċekkjaw jekk
fopen attwalment maħduma qabel ma tmur

63
00:03:07,270 --> 00:03:08,350
timmodifika fajl.

64
00:03:08,350 --> 00:03:09,760
Dan jista 'jkun ħażin.

65
00:03:09,760 --> 00:03:13,560
Jekk inti ħadthom insejt fclose fajl
li inti stajt fopened, li huwa simili għal

66
00:03:13,560 --> 00:03:14,400
nixxija memorja.

67
00:03:14,400 --> 00:03:15,980
Li pretty bad.

68
00:03:15,980 --> 00:03:18,670
U jinsa li jiċċekkja jekk inti stajt
laħqu t-tmiem tal-fajl qabel ma

69
00:03:18,670 --> 00:03:19,790
tibda tikteb lilha.

70
00:03:19,790 --> 00:03:22,320
>> Mela jekk inti tgħidli, ħej, jien fuq
l-aħħar tal-fajl.

71
00:03:22,320 --> 00:03:23,750
Agħti me 5 bytes aktar.

72
00:03:23,750 --> 00:03:27,370
Ukoll, li probabbilment mhux se
taħdem il-mod inti tistenna.

73
00:03:27,370 --> 00:03:30,930
Li tassew għal File I / O,
għaliex għamilna daqstant minnu

74
00:03:30,930 --> 00:03:32,300
mal-problema stabbiliti.

75
00:03:32,300 --> 00:03:36,000
Mela jekk inti mifhum dak li kien għaddej
fil Problem Set 5, ftakar l bitmats

76
00:03:36,000 --> 00:03:40,090
u l-JPEGs, allura int probabilment kollha
stabbiliti għall File I / O. Jekk dan huwa daqsxejn

77
00:03:40,090 --> 00:03:44,770
fuzzy, definittivament tirrevedi din il-problema
stabbiliti u l-materjal assoċjati.

78
00:03:44,770 --> 00:03:51,110
>> Structs kienu l-tema li kienu fuq il-
linja bejn Quiz 0 u Quiz 1.

79
00:03:51,110 --> 00:03:53,090
Ma pjuttost tagħmel il-qatgħa għal Quiz 0.

80
00:03:53,090 --> 00:03:57,040
Sabiex dawn ser definittivament fuq
Quiz 1, Ġimgħa 7, it-tnejn.

81
00:03:57,040 --> 00:03:58,150
X'inhu Istituzzjonjijiet?

82
00:03:58,150 --> 00:04:00,250
Here we juru Struct.

83
00:04:00,250 --> 00:04:03,140
Huwa simili ta 'tip ġdid.

84
00:04:03,140 --> 00:04:07,940
Huwa bħal kontenitur
għall-oqsma multipli.

85
00:04:07,940 --> 00:04:12,970
>> F'dan il-każ, konna ddikjarat Istituzzjonjijiet
student li għandha żewġ oqsma -

86
00:04:12,970 --> 00:04:17,750
string li aħna qed ssejjaħ isem u
l int li aħna qed ssejjaħ età.

87
00:04:17,750 --> 00:04:21,450
Allura meta I jgħaddu madwar istudenti jew I
timmodifika l-istudenti, I ser tkun kapaċi

88
00:04:21,450 --> 00:04:24,430
aċċess isem tagħhom u l-età tagħhom.

89
00:04:24,430 --> 00:04:26,670
Ejja nħarsu lejn xi kodiċi għal dan.

90
00:04:26,670 --> 00:04:29,090
Hawnhekk naraw li stajt iddikjarat
student s, bħal

91
00:04:29,090 --> 00:04:30,300
Niddikjara kwalunkwe varjabbli -

92
00:04:30,300 --> 00:04:32,430
int x, y int, eċċetera.

93
00:04:32,430 --> 00:04:34,180
>> Hawn student s.

94
00:04:34,180 --> 00:04:37,370
Huwa jibda ma 'xejn fl-oqsma tiegħu.

95
00:04:37,370 --> 00:04:38,240
Mela ejja jistabbilixxu lilhom.

96
00:04:38,240 --> 00:04:40,681
Tissettja oqsma ta 'Struct ma dot.

97
00:04:40,681 --> 00:04:43,780
Hekk stajt qal hawnhekk li s.name = RJ.

98
00:04:43,780 --> 00:04:46,470
U s.age = 21.

99
00:04:46,470 --> 00:04:48,500
Tista 'wkoll taġġorna l-oqsma
bl-istess mod youd taġġorna

100
00:04:48,500 --> 00:04:49,550
il-valur ta 'varjabbli.

101
00:04:49,550 --> 00:04:53,270
So I trid tibdel isem tiegħi minn RJ ma
ebda perjodi għall R.J. spelt l-

102
00:04:53,270 --> 00:04:54,540
mod korrett.

103
00:04:54,540 --> 00:04:58,890
Ikun s.name = RJ, l-istess
kif għidna oriġinarjament.

104
00:04:58,890 --> 00:05:00,030
U allura inti tista 'aċċess għalihom.

105
00:05:00,030 --> 00:05:00,930
>> Allura aħna ħadthom jistabbilixxu lilhom.

106
00:05:00,930 --> 00:05:01,840
Imxejna aġġornat minnhom.

107
00:05:01,840 --> 00:05:03,890
Tista 'wkoll aċċess għalihom
fil-ħafna istess mod.

108
00:05:03,890 --> 00:05:09,330
So here, jien istampar
R.J. 21 sena.

109
00:05:09,330 --> 00:05:14,700
U jien aċċess ta 'dawn il-valuri
ma s.name u s.age.

110
00:05:14,700 --> 00:05:17,040
Allura thats aċċess structs
mal-dot notazzjoni.

111
00:05:17,040 --> 00:05:17,850
Yep, mistoqsija?

112
00:05:17,850 --> 00:05:21,176
>> UDJENZA: Hemm raġuni fuq il-
slide qabel li inti ma poġġiex

113
00:05:21,176 --> 00:05:24,848
student fuq il-linja ta 'fuq, bħall typedef
student Istituzzjonjijiet u mbagħad

114
00:05:24,848 --> 00:05:25,840
student fl-aħħar?

115
00:05:25,840 --> 00:05:29,040
>> R.J. Aquino: Għalhekk il-kwistjoni kienet, fuq
dan slide, konna tipikament dehru

116
00:05:29,040 --> 00:05:32,400
typedef node Struct u allura l-
oqsma ta 'l-Istituzzjonjijiet u

117
00:05:32,400 --> 00:05:34,250
allura l-node kelma.

118
00:05:34,250 --> 00:05:37,790
U kif come here I ma jgħidu, typedef
student Struct u allura l-

119
00:05:37,790 --> 00:05:39,820
oqsma ta 'l-Struct u mbagħad student?

120
00:05:39,820 --> 00:05:44,310
Ir-raġuni hija li I m'għandhomx bżonn li
aċċess għaliha ġewwa tal-Struct.

121
00:05:44,310 --> 00:05:46,270
Allura huwa OK li jitilqu minnu mingħajr isem.

122
00:05:46,270 --> 00:05:49,210
I tista 'sempliċement inħallu kif
l Struct anonima.

123
00:05:49,210 --> 00:05:53,130
>> Ir-raġuni nagħmlu dan għal listi marbuta u
affarijiet huwa għaliex ġewwa għandek bżonn

124
00:05:53,130 --> 00:05:55,360
ta 'referenza stilla nodes Struct.

125
00:05:55,360 --> 00:05:58,220
Allura l-Struct għandu jkollu isem,
sabiex inti tista 'aċċess aktar tard.

126
00:05:58,220 --> 00:05:59,540
Huwa dettall minuri.

127
00:05:59,540 --> 00:06:04,750
Iżda inti ser tipikament tara typedef Istituzzjonjijiet
braces kaboċċi jekk inti m'għandekx bżonn

128
00:06:04,750 --> 00:06:08,720
l-isem u typedef Istituzzjonjijiet xi isem
segwit minn braces kaboċċi jekk inti se

129
00:06:08,720 --> 00:06:09,520
bżonn l-isem.

130
00:06:09,520 --> 00:06:12,070
Allura li hija mistoqsija tajba.

131
00:06:12,070 --> 00:06:17,000
>> U fuq dan il-punt, għandna t-tendenza li jimmodifikaw
structs u jgħaddu madwar structs minn

132
00:06:17,000 --> 00:06:18,680
referenza, mhux mill-valur.

133
00:06:18,680 --> 00:06:21,940
Allura aħna ser biss jgħaddu madwar pointers għal
structs minflok tgħaddi madwar il-

134
00:06:21,940 --> 00:06:23,150
structs infushom.

135
00:06:23,150 --> 00:06:28,050
Allura int ħafna drabi ser ikunu
użu, f'dan il-każ, student * jew

136
00:06:28,050 --> 00:06:34,150
Istituzzjonjijiet node * jew node * minflok
l-istudenti jew lymph.

137
00:06:34,150 --> 00:06:39,350
So here, stajt qal, OK, il-varjabbli PTR
se tkun l-indirizz ta 's.

138
00:06:39,350 --> 00:06:45,570
Li għaddej biex tkun l-pointer
lill-istudent R.J.

139
00:06:45,570 --> 00:06:48,965
>> Allura nistgħu nibdew fuq dawk l-oqsma
l-istess kif aħna tikseb xejn.

140
00:06:48,965 --> 00:06:51,460
L-ewwel, ID referenza l-pointer
biex jiksbu l-Struct.

141
00:06:51,460 --> 00:06:55,530
C'est * PTR u mbagħad
dot u mbagħad età.

142
00:06:55,530 --> 00:06:58,790
Allura biex jaċċessaw il-qasam, u stajt aġġornati
Issa sa 22, minħabba, ejja

143
00:06:58,790 --> 00:07:00,860
jiġifieri, kien birthday tiegħi.

144
00:07:00,860 --> 00:07:03,990
Hemm sintassi shortcut
jużaw il-vleġġa hawn.

145
00:07:03,990 --> 00:07:07,060
Età arrow Allura PTR huwa biss
l-istess bħal * ptr.age.

146
00:07:07,060 --> 00:07:10,150

147
00:07:10,150 --> 00:07:11,550
Issa, li xi ħaġa inti ser ikollok
li jimmemorizza u ftakar.

148
00:07:11,550 --> 00:07:15,010
>> You użati ħafna fil pset6,
l pset speller.

149
00:07:15,010 --> 00:07:18,350
Iżda dan huwa attwalment dak li għaddej
fuq taħt il-barnuża.

150
00:07:18,350 --> 00:07:20,500
Huwa dereferencing l-pointer
u mbagħad jaċċedi għaliha.

151
00:07:20,500 --> 00:07:21,432
Mistoqsija?

152
00:07:21,432 --> 00:07:22,682
>> UDJENZA: [inaudible].

153
00:07:22,682 --> 00:07:25,860

154
00:07:25,860 --> 00:07:28,060
>> R.J. Aquino: Allura għaliex aħna jużaw
pointers bħala structs minflok il-

155
00:07:28,060 --> 00:07:29,500
structs infushom?

156
00:07:29,500 --> 00:07:33,740
Ir-raġuni tkun jekk int tgħaddi
a Struct għal funzjoni, inti probabilment

157
00:07:33,740 --> 00:07:36,900
jridu jgħaddu madwar biss 4 jew hekk
bytes li jirrappreżentaw l-pointer, kif

158
00:07:36,900 --> 00:07:40,375
kuntrarju għall-potenzjalment 30 jew
40 bytes li huma l Istituzzjonjijiet.

159
00:07:40,375 --> 00:07:44,410
Allura tgħaddi xi ħaġa għal xi funzjoni
tkun eħfef meta l-ħaġa

160
00:07:44,410 --> 00:07:48,230
hija iżgħar fil-qosor.

161
00:07:48,230 --> 00:07:49,074
Mistoqsija?

162
00:07:49,074 --> 00:07:53,026
>> UDJENZA: Inti tista semmejt dan
fil-bidu, iżda hemm

163
00:07:53,026 --> 00:07:56,000
slides oħra fuq [inaudible]?

164
00:07:56,000 --> 00:07:58,960
>> R.J. Aquino: Dawn slides se jkun
up wara s-sessjoni ta 'reviżjoni.

165
00:07:58,960 --> 00:08:00,210
Aħna ser post minnhom fuq il-websajt.

166
00:08:00,210 --> 00:08:02,450

167
00:08:02,450 --> 00:08:06,870
Allura jimxu fuq u jimxu fuq ftit
aktar mgħaġġel, aħna qed tmur biex jitkellmu dwar data

168
00:08:06,870 --> 00:08:07,350
istrutturi.

169
00:08:07,350 --> 00:08:08,040
Hemm ħafna.

170
00:08:08,040 --> 00:08:10,080
We koperti mazz minnhom.

171
00:08:10,080 --> 00:08:12,500
Hawn dak li għandek tifhem
dwar l-istruttura tad-data.

172
00:08:12,500 --> 00:08:15,590
>> Inti għandek verament jifhem bi għolja
livell dak li kull istruttura hija.

173
00:08:15,590 --> 00:08:21,190
Inti tista 'tispjega bl-Ingliż tiegħek
ħabib li ma jkunx ħa CS50 kif

174
00:08:21,190 --> 00:08:25,580
aħna qed jorganizza data tagħna u għaliex aħna'd
tkun qed tuża xi ħaġa b'dan il-mod?

175
00:08:25,580 --> 00:08:26,990
Dik ħaġa waħda.

176
00:08:26,990 --> 00:08:29,650
Ħaġa tnejn, jifhmu
l-implimentazzjoni.

177
00:08:29,650 --> 00:08:34,270
Allura jifhmu kif jużaw dawn l-affarijiet
fl C. U aħna ser jkunu għaddejjin fuq dan.

178
00:08:34,270 --> 00:08:39,030
>> U mbagħad ħaġa tlieta jkunu jafu l-
ħinijiet run u l-limitazzjonijiet tal-

179
00:08:39,030 --> 00:08:40,470
istrutturi varji li inti qed tuża.

180
00:08:40,470 --> 00:08:44,059
Allura wieħed jifhem għaliex inti tuża
hash tabella minflok firxa.

181
00:08:44,059 --> 00:08:49,570
Jifhmu kif fast, fuq medja,
aċċess tabella hash huwa.

182
00:08:49,570 --> 00:08:54,010
Jifhmu liema operazzjonijiet huma veloċi fuq
lista marbuta iżda bil-mod fuq arrays u

183
00:08:54,010 --> 00:08:56,080
vice versa.

184
00:08:56,080 --> 00:08:59,780
Allura biex jifhmu li, inti ser ikollok
jifhmu notazzjoni Big-O biss li tkun taf

185
00:08:59,780 --> 00:09:01,310
kif jitkellmu dwar dawn
xorta ta 'affarijiet.

186
00:09:01,310 --> 00:09:02,700
U aħna ser nitkellmu dwar dan.

187
00:09:02,700 --> 00:09:06,040
>> Allura l-ewwel ħaġa, listi marbuta.

188
00:09:06,040 --> 00:09:07,770
Hawnhekk hija stampa ta 'livell għoli
ta 'lista marbuta.

189
00:09:07,770 --> 00:09:08,830
Nuru dan fil-klassi.

190
00:09:08,830 --> 00:09:11,670
Aħna tipikament ikollhom 10 persuni
wieqfa fuq l-istadju.

191
00:09:11,670 --> 00:09:16,790
Iżda aħna għandna serje ta 'punti ta' konġunzjoni fejn kull
node għandha xi valur u pointer

192
00:09:16,790 --> 00:09:18,610
għall-valur li jmiss tagħha.

193
00:09:18,610 --> 00:09:21,730
Allura biex tikseb minn node wieħed għall-ieħor, inti
biss jgħidu, tagħti me-node li jmiss.

194
00:09:21,730 --> 00:09:22,530
Inti għandek li node.

195
00:09:22,530 --> 00:09:23,770
Agħtini l-node li jmiss.

196
00:09:23,770 --> 00:09:24,400
Inti għandek li node.

197
00:09:24,400 --> 00:09:28,790
Agħtini l-node li jmiss u l-bqija
sakemm hemm l-ebda xellug node.

198
00:09:28,790 --> 00:09:31,850
>> Allura jkomplu jitkellmu dwar
f'livell għoli.

199
00:09:31,850 --> 00:09:34,100
Huwa faċli ħafna li daħħal affarijiet
fil-lista marbuta.

200
00:09:34,100 --> 00:09:36,010
Jekk inti ma 'kura dwar l-ordni,
inti tista 'biss qatra

201
00:09:36,010 --> 00:09:36,840
dritt fil-bidu.

202
00:09:36,840 --> 00:09:38,520
Dak iż-żmien kostanti.

203
00:09:38,520 --> 00:09:39,900
Iżda huwa diffiċli li ssib valur.

204
00:09:39,900 --> 00:09:43,060
Jekk inti qed tipprova jistaqsu,
huwa seba 'fil-lista tiegħi?

205
00:09:43,060 --> 00:09:44,740
Ikollok tmur permezz
kull valur wieħed.

206
00:09:44,740 --> 00:09:45,680
Huwa dan seba?

207
00:09:45,680 --> 00:09:46,610
Huwa dan seba?

208
00:09:46,610 --> 00:09:47,770
Huwa dan seba?

209
00:09:47,770 --> 00:09:48,690
Huwa dan seba?

210
00:09:48,690 --> 00:09:49,830
Aktar u aktar mill-ġdid.

211
00:09:49,830 --> 00:09:51,520
U li O (n).

212
00:09:51,520 --> 00:09:53,800
Allura meta jistudjaw għall-kwizz,
tqabbel dan mal arrays.

213
00:09:53,800 --> 00:09:57,010

214
00:09:57,010 --> 00:09:58,220
>> Huwa li OK?

215
00:09:58,220 --> 00:09:59,220
Id-dwal marru dim.

216
00:09:59,220 --> 00:10:01,110
OK.

217
00:10:01,110 --> 00:10:02,400
Meta hija lista irbit aħjar?

218
00:10:02,400 --> 00:10:04,640
Meta huwa firxa aħjar?

219
00:10:04,640 --> 00:10:06,670
Mela ejja nħarsu lejn xi kodiċi.

220
00:10:06,670 --> 00:10:08,960
Hawnhekk huwa node potenzjali.

221
00:10:08,960 --> 00:10:09,770
Huwa Struct.

222
00:10:09,770 --> 00:10:12,220
Hija għandha n int, li
se jkun il-valur tagħna.

223
00:10:12,220 --> 00:10:17,780
U għandu node Struct * li jmiss, li
huwa pointer tagħna għall-node li jmiss.

224
00:10:17,780 --> 00:10:23,040
Allura hawnhekk, nistgħu naraw li aħna ġara
li tpoġġi int fl node tagħna.

225
00:10:23,040 --> 00:10:27,850
Imma jekk dan kien lista marbut ta 'char
stilla jew lista marbut ta 'sufruni, aħna

226
00:10:27,850 --> 00:10:28,820
totalment tista 'tagħmel dan wisq.

227
00:10:28,820 --> 00:10:33,110
>> Ftakar fil pset6, inti probabilment kellha
lista marbuta ta 'stilel char jew eżatt

228
00:10:33,110 --> 00:10:34,360
arrays char statiċi.

229
00:10:34,360 --> 00:10:37,370

230
00:10:37,370 --> 00:10:39,040
Ejja nħarsu hawn fuq operazzjoni.

231
00:10:39,040 --> 00:10:43,570
Allura aħna tixtieq li daħħal ġdida
n fil-lista marbuta tagħna.

232
00:10:43,570 --> 00:10:48,940
Nibdew mill b'ras pointer li hija
pointer għal dan node li għandha l-

233
00:10:48,940 --> 00:10:53,460
valur ta 'n u li jmiss ta' pointer li
punti għal dan node huwa valur ta '

234
00:10:53,460 --> 00:10:57,760
n u li jmiss ta null, għaliex
huwa l-aħħar node.

235
00:10:57,760 --> 00:11:00,440
Għalhekk fl-interess ta 'żmien, I se
ipoġġu l-kodiċi fuq l-iskrin.

236
00:11:00,440 --> 00:11:03,130
U aħna ser jimxu permezz ta 'dan
ftit linji fi żmien.

237
00:11:03,130 --> 00:11:05,790
>> Allura hawnhekk il-kodiċi.

238
00:11:05,790 --> 00:11:07,560
Nispera huwa tinqara.

239
00:11:07,560 --> 00:11:11,275
L-ewwel ħaġa li nagħmlu huwa
aħna malloc a node ġdid.

240
00:11:11,275 --> 00:11:15,105
Għalhekk jagħmel pointer għal node ġdid li
ma pjuttost jkollhom xejn stabbiliti

241
00:11:15,105 --> 00:11:16,450
up fil encore.

242
00:11:16,450 --> 00:11:19,580
Aħna jivverifika sabiex ikun żgur li
l-node ġdid mhuwiex null.

243
00:11:19,580 --> 00:11:22,220
Inkella, aħna għandna biex iċedu.

244
00:11:22,220 --> 00:11:27,680
Allura wara li ivverifikat li, aħna issa
tistabbilixxi l-valuri fil-node.

245
00:11:27,680 --> 00:11:31,520
Allura aħna tpoġġi l-n-ġdid fil-qasam n tagħna.

246
00:11:31,520 --> 00:11:36,050
U aħna waqqafna l-pointer li jmiss għall-punt li
ir-ras oriġinali, sabiex inkunu nistgħu

247
00:11:36,050 --> 00:11:38,900
issa daħħal din
node fil-lista tagħna.

248
00:11:38,900 --> 00:11:44,600
>> Fl-aħħarnett, aħna għandna l-punt ewlieni globali
biex node ġdid tagħna, hekk li jekk konna biex

249
00:11:44,600 --> 00:11:50,300
bidu għal ras, irridu jkunu f'dan
ewwel node ġdid minflok

250
00:11:50,300 --> 00:11:51,560
l-ewwel node qodma.

251
00:11:51,560 --> 00:11:55,320
U meta din il-funzjoni ħruġ, il-
varjabbli node ġdid m'għadux jeżisti,

252
00:11:55,320 --> 00:11:57,130
għaliex kienet lokali għall-funzjoni.

253
00:11:57,130 --> 00:11:59,770
Allura dan huwa l-istat tad-dinja.

254
00:11:59,770 --> 00:12:03,570
Ewlieni globali tagħna punti li ġdida tagħna
ewwel node, li jindika tagħna

255
00:12:03,570 --> 00:12:06,346
ewwel node oriġinali, liema punti
għall-node wara dik.

256
00:12:06,346 --> 00:12:09,790
>> Dan kien inserzjoni.

257
00:12:09,790 --> 00:12:12,150
Nittama li kien relattivament
sempliċi biex isegwu.

258
00:12:12,150 --> 00:12:14,300
Meta fid-dubju, tfassal stampa.

259
00:12:14,300 --> 00:12:17,820
So I isibu li jitkellem dwar
listi konnessi u tħares lejn

260
00:12:17,820 --> 00:12:19,870
kodiċi huwa ħafna mhux utli.

261
00:12:19,870 --> 00:12:23,790
Billi tħares lejn stampa ta 'marbuta
lista tippermetti lili biex jaħsbu, oh, so

262
00:12:23,790 --> 00:12:24,970
I jkollhom din node hawn.

263
00:12:24,970 --> 00:12:28,980
Imma jekk jien jaġġornaw dik pointer,
jispiċċa skonnettjata.

264
00:12:28,980 --> 00:12:34,340
U stajt minsija fejn
l-node tmur.

265
00:12:34,340 --> 00:12:35,390
U l-kodiċi ħruġ.

266
00:12:35,390 --> 00:12:37,830
U inti għandek lymph multipli
li huma skonnettjata.

267
00:12:37,830 --> 00:12:39,970
U inti ma jispiċċaw ma
il-lista trid.

268
00:12:39,970 --> 00:12:43,320
>> Mela jekk inti tiġbed l-istampa u tagħmel dan
pass pass, wieħed jittama, tkun taf tara

269
00:12:43,320 --> 00:12:46,840
l-ordni korretta ta 'affarijiet f'termini ta'
taġġorna l-pointers li tagħmel ċert

270
00:12:46,840 --> 00:12:48,830
li l-lista jiltaqa 'flimkien.

271
00:12:48,830 --> 00:12:51,240
Daħħal huwa relattivament sempliċi.

272
00:12:51,240 --> 00:12:55,210
A waħda aktar ikkumplikat tkun
inserzjoni ġo lista magħżula.

273
00:12:55,210 --> 00:12:59,980
Funzjoni aktar ikkumplikat huwa tħassar
u jsibu, sabiex tfittex permezz ta 'lista li

274
00:12:59,980 --> 00:13:03,030
ara jekk xi ħaġa hemmhekk.

275
00:13:03,030 --> 00:13:07,220
Forsi inti għamilt dan fil pset6 meta inti
ltqajna fis tabella hash tiegħek u inti qal,

276
00:13:07,220 --> 00:13:10,460
ukoll, huwa l-tuffieħ kelma
fil-lista marbuta tiegħi?

277
00:13:10,460 --> 00:13:11,440
>> Allura inti tista 'diġà għamlu dan.

278
00:13:11,440 --> 00:13:15,530
Iżda ċert, jġedded memorja tiegħek
u jippruvaw reimplement isibu u

279
00:13:15,530 --> 00:13:19,150
reimplement tħassar għal lista marbuta.

280
00:13:19,150 --> 00:13:22,850
Nota tal-ġenb gost, hemm ukoll doppjament-linked
listi, fejn inti għandek

281
00:13:22,850 --> 00:13:27,490
pointers dan il-punt kemm quddiem u
lura, sabiex inti tista 'tmur għall-

282
00:13:27,490 --> 00:13:29,270
node li jmiss u lill-node preċedenti.

283
00:13:29,270 --> 00:13:33,860
U kien hemm kwistjoni fuq il-sena li għaddiet
kwizz ta 'dak it-tip, jitkellem

284
00:13:33,860 --> 00:13:36,190
dwar listi doppjament-linked.

285
00:13:36,190 --> 00:13:40,070
>> Issa, li l-istruttura li int
relattivament familjari ma ', minħabba li ħafna

286
00:13:40,070 --> 00:13:42,520
minnkom probabbilment tintuża minnhom fuq pset6.

287
00:13:42,520 --> 00:13:45,680
Hawn wieħed li l-daqsxejn inqas familjari.

288
00:13:45,680 --> 00:13:51,020
Bħala nota tal-ġenb, naħseb li Quiz 1 huwa
primarjament aktar diffiċli milli Quiz 0, għaliex

289
00:13:51,020 --> 00:13:54,600
l-għalf qed tagħmel, inti
ma jsir kemm.

290
00:13:54,600 --> 00:13:58,100
Li tikkontesta din mod ieħor, għall Quiz 0,
inti kien kiteb ħafna ta 'C. U aħna

291
00:13:58,100 --> 00:13:58,880
talab li inti dwar C.

292
00:13:58,880 --> 00:14:02,310
>> Għal Quiz 1, aħna qed tmur biex nitolbuk dwar
PHP u JavaScript, li inti

293
00:14:02,310 --> 00:14:03,490
ma miktub kemm ta '.

294
00:14:03,490 --> 00:14:07,590
Aħna ser jgħidlek dwar C-kodiċi li
inti ma miktub kemm ta ',

295
00:14:07,590 --> 00:14:09,130
dan il-għalf avvanzati C.

296
00:14:09,130 --> 00:14:11,520
Allura definittivament, il-prattika l-għalf we
tkellem dwar fl lecture li inti

297
00:14:11,520 --> 00:14:15,260
ma neċessarjament tagħmel
fuq il-problema sett.

298
00:14:15,260 --> 00:14:17,870
>> Taħdit li, inti ma miktub
munzell fuq problema stabbiliti.

299
00:14:17,870 --> 00:14:19,610
Iżda kien fil-lecture.

300
00:14:19,610 --> 00:14:22,530
Hawn l-istampa ta 'livell għoli ta'
stacks li nuru kull sena.

301
00:14:22,530 --> 00:14:26,180
Hu l-munzell ta 'dixxijiet fil-
l-dining sala Mather.

302
00:14:26,180 --> 00:14:30,570
Fuq livell għoli, stacks huma aħħar
fl-ewwel out istruttura tad-data.

303
00:14:30,570 --> 00:14:32,040
Dan ifisser li inti qed tmur
biex l-affarijiet fil -

304
00:14:32,040 --> 00:14:36,400
1, 3, 7, 12, 14, negattiv 0.

305
00:14:36,400 --> 00:14:39,180
L-unika ħaġa I ma setax
qal - negattiv 3, 0.

306
00:14:39,180 --> 00:14:40,250
Inti tpoġġi dawn l-affarijiet pulzieri

307
00:14:40,250 --> 00:14:42,940
U l-aħħar waħda inti tpoġġi fil hija l-ewwel
wieħed li għaddej biex toħroġ.

308
00:14:42,940 --> 00:14:44,170
>> Allura għandek żewġ operazzjonijiet -

309
00:14:44,170 --> 00:14:45,260
timbotta u pop.

310
00:14:45,260 --> 00:14:49,180
Kollha ta 'l-istabbiliment li kien I
gesturing bħal dan huma push.

311
00:14:49,180 --> 00:14:52,020
U mbagħad meta I jilħqu in to grab
xi ħaġa jew jilħqu fuq top biex grab

312
00:14:52,020 --> 00:14:53,940
xi ħaġa, li pop.

313
00:14:53,940 --> 00:14:55,540
Allura aħna qed tmur biex jimplimentaw stacks.

314
00:14:55,540 --> 00:14:57,870
U aħna wrew lilhom fl lecture
użu arrays.

315
00:14:57,870 --> 00:14:59,550
Iżda int tista 'tagħmel lilhom
użu ta 'listi marbuta.

316
00:14:59,550 --> 00:15:01,770
A munzell hija data konċettwali
istruttura, mhux bħal xi

317
00:15:01,770 --> 00:15:03,760
waħda speċifika ta 'implimentazzjoni.

318
00:15:03,760 --> 00:15:06,420
>> Allura dak li kieku look like?

319
00:15:06,420 --> 00:15:07,970
Hija kienet ser tfittex tip ta 'bħal dan.

320
00:15:07,970 --> 00:15:10,840
Youd jkollhom daqs integer.

321
00:15:10,840 --> 00:15:16,000
U inti d jkollhom firxa ta 'valuri li
aħna qed ssejjaħ trejs, minħabba li l-

322
00:15:16,000 --> 00:15:18,570
dak l-istampa kienet għal
magħna - int trays -

323
00:15:18,570 --> 00:15:21,740
u mbagħad ftit kapaċità massima.

324
00:15:21,740 --> 00:15:27,100
Allura dak li timbotta look like?

325
00:15:27,100 --> 00:15:33,250
Ukoll, jekk ikollna munzell s, imbagħad imbotta
xi ħaġa fuq i, aħna se jiksbu

326
00:15:33,250 --> 00:15:34,620
id-daqs tal-i.

327
00:15:34,620 --> 00:15:42,270
U li tkun li jmiss
post miftuħ ta 'firxa tagħna.

328
00:15:42,270 --> 00:15:50,510
Mela jekk għandna tliet affarijiet fil-ċmieni tagħna,
allura trays 3 se tkun li jmiss

329
00:15:50,510 --> 00:15:54,290
spot miftuħa, għaliex 0, 1, u
2 huma diġà mimlija up.

330
00:15:54,290 --> 00:16:01,790
>> Allura aħna tpoġġi l-valur fis
s.trays [s.size], it-tielet post.

331
00:16:01,790 --> 00:16:06,290
U allura aħna inkrement s.size jiġifieri,
ħej, kellna tliet affarijiet qabel.

332
00:16:06,290 --> 00:16:07,400
Issa, għandna erba.

333
00:16:07,400 --> 00:16:10,180
Allura l-ħin li jmiss inti timbotta, int
ser jitqiegħdu xi ħaġa fis 4.

334
00:16:10,180 --> 00:16:15,560
Jew il-ħin li jmiss inti pop, int ser
li tħares lejn 3 minflok 4 jew ikun x'ikun.

335
00:16:15,560 --> 00:16:18,000
U allura aħna ser jirritornaw veru li
jiġifieri, ħej, aħna irnexxielu.

336
00:16:18,000 --> 00:16:19,160
Dan maħduma.

337
00:16:19,160 --> 00:16:22,060
Bħala regola ta 'thumb, jekk il-funzjoni li l-
suppost li jirritornaw vera jew

338
00:16:22,060 --> 00:16:26,370
falza dejjem prospetti veru, inti tista '
għamlu xi ħaġa ħażina.

339
00:16:26,370 --> 00:16:28,350
Allura ma dan ix-xogħol?

340
00:16:28,350 --> 00:16:32,400
>> Ukoll, hija taħdem multa għal 1, u
2, u 3, u 4, u ħamsa.

341
00:16:32,400 --> 00:16:34,640
Imma ejja ngħidu I tilħaq il-kapaċità tiegħi.

342
00:16:34,640 --> 00:16:38,750
Stajt imbagħad run fis-problema, għaliex
jekk id-daqs huwa l-istess kapaċità, jien

343
00:16:38,750 --> 00:16:43,340
issa tipprova xi ħaġa fi
firxa fejn I m'għandhomx spazju.

344
00:16:43,340 --> 00:16:46,980
Allura check qasir biex jiffissaw dan.

345
00:16:46,980 --> 00:16:51,630
Jekk s.size KAPAĊITÀ ==, ritorn foloz.

346
00:16:51,630 --> 00:16:54,130
Inkella, mur u jagħmlu dak li għamilna.

347
00:16:54,130 --> 00:16:55,660
Allura dak li inkella jista aħna nitolbu
dwar għas stacks?

348
00:16:55,660 --> 00:16:56,460
X'iktar għandek tistudja?

349
00:16:56,460 --> 00:16:57,690
X'iktar għandek prattika?

350
00:16:57,690 --> 00:17:01,030
>> Ukoll, l-implimentazzjoni pop.

351
00:17:01,030 --> 00:17:02,370
Aħna diġà għamlu push.

352
00:17:02,370 --> 00:17:04,280
I ser jiffissaw dak.

353
00:17:04,280 --> 00:17:08,180
A implimentazzjoni non-array, fejn
tuża lista marbuta, forsi.

354
00:17:08,180 --> 00:17:09,390
A implimentazzjoni mhux int.

355
00:17:09,390 --> 00:17:10,940
Aħna ma ints hawn.

356
00:17:10,940 --> 00:17:11,880
Iżda dan seta 'kien flowts.

357
00:17:11,880 --> 00:17:13,010
I setgħu ġew kordi.

358
00:17:13,010 --> 00:17:14,290
Dan seta 'kien istilel char.

359
00:17:14,290 --> 00:17:17,960
Ħares lejn kwizzijiet aħħar għat-tipi ta '
mistoqsijiet konna mistoqsija dwar stacks.

360
00:17:17,960 --> 00:17:20,000
>> I ser ngħid li aħna koperti stacks madwar
l-istess kif aħna ħadthom koperti minnhom

361
00:17:20,000 --> 00:17:20,540
aħħar snin.

362
00:17:20,540 --> 00:17:24,400
Allura l-mistoqsijiet kwizz għandhom
tkun indikazzjoni tajba.

363
00:17:24,400 --> 00:17:27,010
Nimxu 'l quddiem aktar malajr, kjuwijiet.

364
00:17:27,010 --> 00:17:28,200
Huma qed simili stacks.

365
00:17:28,200 --> 00:17:29,960
Iżda dawn qed l-ewwel fl-ewwel out.

366
00:17:29,960 --> 00:17:33,530
Jekk int British, kju il-kelma
probabbilment magħmula ħafna sens lilek.

367
00:17:33,530 --> 00:17:36,390
Inkella, jista 'jkollok
semgħu biha bħala linja.

368
00:17:36,390 --> 00:17:38,120
Huma jaħdmu bħal-linja
fil-maħżen Apple.

369
00:17:38,120 --> 00:17:40,740
L-ewwel persuna li juru up fi 3:00
fil-għodu huwa l-ewwel

370
00:17:40,740 --> 00:17:42,880
persuna li jixtru iPad tiegħu.

371
00:17:42,880 --> 00:17:44,260
>> Allura għandna żewġ operazzjonijiet -

372
00:17:44,260 --> 00:17:45,720
enqueue u dequeue.

373
00:17:45,720 --> 00:17:47,560
Enqueue tpoġġi xi ħadd fil-linja.

374
00:17:47,560 --> 00:17:50,070
Dequeue jiġbed l-ewwel
persuna off-linja.

375
00:17:50,070 --> 00:17:52,640
Għal darb'oħra, nistgħu timplimenta
dan ma 'firxa.

376
00:17:52,640 --> 00:17:54,880
Allura x'inhi l-Istituzzjonjijiet we
wera fil-lecture?

377
00:17:54,880 --> 00:17:57,660
Kien dan wieħed.

378
00:17:57,660 --> 00:17:59,300
Għal darb'oħra, in-numri.

379
00:17:59,300 --> 00:18:02,020
Għal darb'oħra, id-daqs u dan front ħaġa ġdida.

380
00:18:02,020 --> 00:18:04,880
Għaliex hemm xi ħaġa imsejħa 'quddiem?

381
00:18:04,880 --> 00:18:07,050
Hu l-indiċi tal-li jmiss
element li dequeue.

382
00:18:07,050 --> 00:18:12,210
Huwa biss internament iżżomm rekord ta '
l-ewwel Guy biex juru up, sabiex inkunu

383
00:18:12,210 --> 00:18:15,005
tista 'pull it out meta għandna bżonn.

384
00:18:15,005 --> 00:18:19,322
>> Żgur tħares lejn noti lecture u jippruvaw
biex jimplimentaw enqueue u dequeue

385
00:18:19,322 --> 00:18:21,700
meta jistudjaw għall-kwizz.

386
00:18:21,700 --> 00:18:23,190
Affarijiet importanti li wieħed jaħseb dwar.

387
00:18:23,190 --> 00:18:27,260
Tgeżwir madwar jekk il-quddiem flimkien mal-
daqs jispiċċa akbar minn kapaċità.

388
00:18:27,260 --> 00:18:32,670
Għal darb'oħra, jekk l-istruttura tiegħek hija sħiħa,
int se jkollhom problema.

389
00:18:32,670 --> 00:18:34,780
Hash tabelli inti stajt tidher qabel.

390
00:18:34,780 --> 00:18:39,820
Ħafna mill inti probabilment implimentati
dawn fuq pset6.

391
00:18:39,820 --> 00:18:44,210
Hija struttura li timmira għall-O (1)
inserzjoni ta 'żmien kostanti u O (1)

392
00:18:44,210 --> 00:18:46,430
lookup żmien kostanti.

393
00:18:46,430 --> 00:18:49,760
>> Fl CS50, aħna implimentat dan bħala
firxa ta 'listi marbuta.

394
00:18:49,760 --> 00:18:53,690
Il-komponent ewlieni għal tabella hash
hija l-funzjoni hash.

395
00:18:53,690 --> 00:18:58,350
Għalhekk tikkonverti input tiegħek, ejja ngħidu,
kelma dizzjunarju, f'numru,

396
00:18:58,350 --> 00:18:59,560
li se tkun indiċi tagħna.

397
00:18:59,560 --> 00:19:01,410
U aħna ser tuża l-indiċi
fil-firxa tagħna.

398
00:19:01,410 --> 00:19:05,374
Allura hawnhekk stampa ftit ħelu
minn study.50.net.

399
00:19:05,374 --> 00:19:08,060
Aħna tarmi l-kliem fil
funzjoni hash tagħna.

400
00:19:08,060 --> 00:19:10,950
U l-funzjoni hash tgħidilna
fejn jitqiegħdu dawn il-kliem.

401
00:19:10,950 --> 00:19:15,650
>> Dan huwa kbir fl-art fejn
hemm kelma waħda biss għal kull slot.

402
00:19:15,650 --> 00:19:20,480
Imma kif tiftakar minn pset6, hemm
huma kliem aktar minn slots.

403
00:19:20,480 --> 00:19:23,080
Allura x'jiġri meta inti
tikseb ħabta?

404
00:19:23,080 --> 00:19:26,730
Minflok ħażna valur wieħed,
ejja ngħidu, tabella hash 3, inti

405
00:19:26,730 --> 00:19:27,990
jaħżnu lista marbuta.

406
00:19:27,990 --> 00:19:32,900
U hekk minflok li cantaloupe
hawn, inti għandek lista marbuta,

407
00:19:32,900 --> 00:19:34,190
fejn l-ewwel node huwa cantaloupe.

408
00:19:34,190 --> 00:19:35,260
U l-node li jmiss huwa qattus.

409
00:19:35,260 --> 00:19:38,970
U t-tielet node huwa kolliżjoni, ejja
jgħidu, għaliex dawn il-kliem kollha jibdew

410
00:19:38,970 --> 00:19:41,110
mal C.

411
00:19:41,110 --> 00:19:42,700
>> Għalhekk ħafna mill għamilt dan għal pset6.

412
00:19:42,700 --> 00:19:45,685
Jekk inti ma tagħmel tabella hash fuq pset6
u inti attentat xi ħaġa simili

413
00:19:45,685 --> 00:19:47,720
a trie, definittivament tirrevedi tabelli hash.

414
00:19:47,720 --> 00:19:50,650
Jekk inti ma tagħmel dan fuq pset6, definittivament
tirrevedi tabelli hash.

415
00:19:50,650 --> 00:19:53,610
U jekk inti ma kien fuq pset6 u hija ma
taħdem pjuttost tajba u int

416
00:19:53,610 --> 00:19:56,150
kellhom ħafna problemi ma 'dan, definittivament
tirrevedi tabelli hash.

417
00:19:56,150 --> 00:20:01,610
Allura l-lezzjoni hija verament definittivament
tirrevedi tabelli hash.

418
00:20:01,610 --> 00:20:07,130
>> Il-minoranza l-kbira tal inti ppruvaw
out tipprova fuq pset6.

419
00:20:07,130 --> 00:20:08,570
Stampa ta 'livell għoli.

420
00:20:08,570 --> 00:20:15,150
Hija xi ħaġa bħal din, fejn kull
node għandha sett ta 'tfal, fejn kull

421
00:20:15,150 --> 00:20:17,100
tfal tikkorrispondi għal ittra.

422
00:20:17,100 --> 00:20:20,520
U kull node jgħid ukoll,
ħej, I am a kelma.

423
00:20:20,520 --> 00:20:25,933
Allura f'dan il-każ, il-kelma Maxwell,
jekk inti ssegwi l-M għall-A għall-

424
00:20:25,933 --> 00:20:28,530
X-W-E-L-L u mbagħad issegwi waħda aktar.

425
00:20:28,530 --> 00:20:32,800
U ikollok dan is-simbolu, delta, li
aħna turi li tfisser din hija kelma.

426
00:20:32,800 --> 00:20:34,780
Allura Maxwell hija kelma.

427
00:20:34,780 --> 00:20:38,430
Dawn deltas huma madwar li tfisser
li l-affarijiet huma kliem u li

428
00:20:38,430 --> 00:20:40,360
affarijiet mhumiex.

429
00:20:40,360 --> 00:20:46,400
>> Għalhekk fl pset6, id-data aħna maħżuna
flimkien ma kwalunkwe mill lymph tagħna kien "I am a

430
00:20:46,400 --> 00:20:52,630
kelma. "U l-ħaġa jibred dwar jipprova
qed juru inserzjoni u

431
00:20:52,630 --> 00:20:55,080
lookup fil O (tul ta 'kelma).

432
00:20:55,080 --> 00:20:59,450
Hekk biss biex jiksbu permezz Maxwell, huwa
M-A-X-W-E-L-L. Allura seba 'jew tmien -

433
00:20:59,450 --> 00:21:00,360
I ma jistgħux jgħoddu -

434
00:21:00,360 --> 00:21:03,920
passi biex tikseb sa l-aħħar
u jiċċekkjaw affarijiet out.

435
00:21:03,920 --> 00:21:06,800
Implimentazzjoni hekk malajr hawn.

436
00:21:06,800 --> 00:21:10,230
Rob għaddiet minn marbut
lista fl postmortem tiegħu.

437
00:21:10,230 --> 00:21:11,600
Sabiex jiċċekkjaw li l-.

438
00:21:11,600 --> 00:21:11,720
Jiddispjacini.

439
00:21:11,720 --> 00:21:13,240
Marru permezz ta 'trie fl postmortem tiegħu.

440
00:21:13,240 --> 00:21:14,260
Sabiex jiċċekkjaw li l-.

441
00:21:14,260 --> 00:21:24,410
>> Imma inti bażikament għandhom kull node għandha 27
indikaturi għall-lymph jmiss u wieħed

442
00:21:24,410 --> 00:21:27,050
Boolean għal am I kelma.

443
00:21:27,050 --> 00:21:31,530
Iċċekkja postmortem Rob għal kif
dan fil-fatt tiġi implimentata.

444
00:21:31,530 --> 00:21:34,750
Istruttura finali tagħna, siġar tagħna
u siġar tfittxija binarja.

445
00:21:34,750 --> 00:21:41,530
Allura tħares lejn dawn, dawn kienu koperti
aktar reċentement Ġimgħa 8, it-Tnejn.

446
00:21:41,530 --> 00:21:46,960
A siġra huwa simili għal trie, ħlief int
ma neċessarjament ikollhom 27 lymph fuq

447
00:21:46,960 --> 00:21:47,500
kull punt.

448
00:21:47,500 --> 00:21:52,820
U inti ma għandekx din id-data f'kull
pass li jissinifika jekk l -

449
00:21:52,820 --> 00:21:54,030
il-passaġġ ma jimpurtax.

450
00:21:54,030 --> 00:22:00,870
Billi trie, il-passaġġ minn fuq għal
qiegħ, Maxwell, kien importanti għalina.

451
00:22:00,870 --> 00:22:05,270
>> Iżda kull node għandha multiple
tfal, forsi.

452
00:22:05,270 --> 00:22:07,290
Għandna xi vokabularju aktar.

453
00:22:07,290 --> 00:22:09,530
L-għerq tal-siġra
jinsab fil-quċċata ħafna.

454
00:22:09,530 --> 00:22:12,520
U aħna ngħidu li l-bottommost ħafna
lymph li m'għandhomx

455
00:22:12,520 --> 00:22:14,530
tfal huma weraq.

456
00:22:14,530 --> 00:22:18,040
Allura bħal trie, siġra
struttura ta 'nodes.

457
00:22:18,040 --> 00:22:21,490
Tip komuni ta 'siġra li aħna qed tmur
biex jitkellmu dwar hija siġra binarju, fejn

458
00:22:21,490 --> 00:22:26,040
kull node m'għandha l-ebda tfal jew
wild wieħed jew żewġt itfal.

459
00:22:26,040 --> 00:22:28,890
Allura din l-istampa hawnhekk mhix
siġra binarju, minħabba

460
00:22:28,890 --> 00:22:32,890
node 3 għandu tlett itfal.

461
00:22:32,890 --> 00:22:38,140
>> Imma jekk konna li jinjora dawk, il-bqija
ta 'dan hija siġra binarja minħabba li

462
00:22:38,140 --> 00:22:43,200
juri l-proprjetà li kull node
għandha żero, wieħed, jew tnejn tfal.

463
00:22:43,200 --> 00:22:46,400
Allura kif nistgħu jesprimu dan fil-kodiċi?

464
00:22:46,400 --> 00:22:51,460
Jista 'jkollna node fejn kull node għandha
integer ġewwa ta 'dan, kif ukoll

465
00:22:51,460 --> 00:22:55,590
bħala pointer għall-siġra fuq ix-xellug
u pointer għall-siġra fuq il-

466
00:22:55,590 --> 00:22:59,510
tajjeb, sabiex l-żewġt itfal.

467
00:22:59,510 --> 00:23:00,880
Kif dan huwa utli?

468
00:23:00,880 --> 00:23:05,740
Ukoll, jekk nagħmlu regoli dwar fejn aħna
tpoġġi lymph, nistgħu nagħmlu tfittxija malajr.

469
00:23:05,740 --> 00:23:10,630
>> Hekk hemm kunċett ta 'tfittxija binarja
siġra, fejn nodes kollha fuq il-

470
00:23:10,630 --> 00:23:14,420
subtree xellug għandhom valur iżgħar
mill-node aħna qed tħares lejn.

471
00:23:14,420 --> 00:23:17,880
U lymph kollha fuq il-subtree dritt
ikollhom valur ikbar

472
00:23:17,880 --> 00:23:18,660
mill-node għerq.

473
00:23:18,660 --> 00:23:20,670
Issa, li tidher simili ħafna ta 'kliem.

474
00:23:20,670 --> 00:23:23,770
Jien ser tqiegħed lilha ġewwa ta 'double
kwotazzjonijiet u nuruk stampa.

475
00:23:23,770 --> 00:23:27,010
Allura hawnhekk huwa eżempju ta '
siġra tfittxija binarja.

476
00:23:27,010 --> 00:23:28,770
Ara li aħna tibda bil 10.

477
00:23:28,770 --> 00:23:31,780
Kollox għall-xellug tal
10 huwa iżgħar minn dan.

478
00:23:31,780 --> 00:23:33,130
U kollox lejn il-lemin
hija akbar minn dan.

479
00:23:33,130 --> 00:23:37,620
>> Iżda aktar minn hekk li, kull node fil-
l-siġra jesprimi din il-proprjetà.

480
00:23:37,620 --> 00:23:42,110
Allura l-node 7 għandha 3 għall-
tax-xellug u 9 lejn il-lemin.

481
00:23:42,110 --> 00:23:44,440
Għalhekk dawk kollha huma iżgħar minn 10.

482
00:23:44,440 --> 00:23:50,470
Iżda tħares lejn biss dawk, 7 għandha
3 għall-xellug tagħha u 9 għad-dritt tiegħu.

483
00:23:50,470 --> 00:23:56,100
U l-istess fuq il-lemin, 15 għandha 14
għall-xellug tagħha u 50 għad-dritt tiegħu.

484
00:23:56,100 --> 00:24:03,770
Allura t-tliet lymph hemmhekk, 15, 14,
u 50, huma wkoll siġra binarju validu

485
00:24:03,770 --> 00:24:05,480
jew siġra tfittxija valida binarju.

486
00:24:05,480 --> 00:24:07,250
U dawn qed kollha akbar minn 10.

487
00:24:07,250 --> 00:24:08,960
Għalhekk huma għandhom jiġu permessi
dwar id-dritt hemmhekk.

488
00:24:08,960 --> 00:24:09,940
Hemm kwistjoni?

489
00:24:09,940 --> 00:24:12,580
>> UDJENZA: Kif taħseb li jittrattaw meta
għandek żewġ sevens?

490
00:24:12,580 --> 00:24:12,850
>> R.J. Aquino: Yeah.

491
00:24:12,850 --> 00:24:16,550
Kif inti jittrattaw żewġ valuri
li huma l-istess?

492
00:24:16,550 --> 00:24:21,465
Xi siġar tfittxija binarja ngħid li inti
jinjora duplikati, minħabba l-għan huwa

493
00:24:21,465 --> 00:24:24,280
biss biex jgħidu, stajt tidher
dawn l-affarijiet s'issa.

494
00:24:24,280 --> 00:24:28,120
Xi siġar tfittxija binarja inti tista 'tgħid
jkollhom għadd ġewwa tal-node.

495
00:24:28,120 --> 00:24:32,000
Oħrajn jista 'jgħid li kollox biex
ix-xellug hija inqas minn jew ugwali għal.

496
00:24:32,000 --> 00:24:33,470
U kollox lejn il-lemin
huwa akbar minn.

497
00:24:33,470 --> 00:24:36,520
>> Huwa biss tiddependi fuq dak li l-
problema hija int jissolvew.

498
00:24:36,520 --> 00:24:40,840
Għalhekk fl-dizzjunarju, per eżempju, inti
ma care about duplikati.

499
00:24:40,840 --> 00:24:41,490
Int tkun tarmi dawn isiru.

500
00:24:41,490 --> 00:24:44,719
Iżda xi problema oħra li inti tista 'kura.

501
00:24:44,719 --> 00:24:49,242
>> UDJENZA: Huwa possibbli li jkollhom
ta '1 għall-xellug tal-15, li

502
00:24:49,242 --> 00:24:50,590
huwa inqas minn 10?

503
00:24:50,590 --> 00:24:51,885
>> R.J. Aquino: Le

504
00:24:51,885 --> 00:24:56,570
Jekk l-14 hawn kienu 1, dan kieku
Ma jkun siġra tfittxija valida binarju,

505
00:24:56,570 --> 00:25:00,840
għaliex kollox għad-dritt ta '
10 għandu jkun akbar minn dan.

506
00:25:00,840 --> 00:25:02,300
U aħna ser tara għaliex.

507
00:25:02,300 --> 00:25:07,960
Jekk fl-art ta 'tfittxija għan tiegħi huwa
isibu 14, nibda l-għerq.

508
00:25:07,960 --> 00:25:08,500
So I tfittex.

509
00:25:08,500 --> 00:25:08,710
OK.

510
00:25:08,710 --> 00:25:10,670
Aħna ser tibda fil-għerq.

511
00:25:10,670 --> 00:25:12,500
Ħares lejn 10.

512
00:25:12,500 --> 00:25:16,050
>> Well, 14, Mira tagħna,
huwa akbar minn 10.

513
00:25:16,050 --> 00:25:17,370
Għalhekk din għandha tkun fuq il-lemin.

514
00:25:17,370 --> 00:25:21,780
Dan huwa simili ħafna għall-telefon kollu
Ħaġa ktieb għamilna, il-binarju

515
00:25:21,780 --> 00:25:23,720
tfittxija hemmhekk.

516
00:25:23,720 --> 00:25:26,430
Iżda minflok tiftix binarju
fil-firxa, aħna qed binarju

517
00:25:26,430 --> 00:25:28,490
tiftix fil din is-siġra.

518
00:25:28,490 --> 00:25:31,260
Allura aħna qed għadhom tfittex 14.

519
00:25:31,260 --> 00:25:32,480
Well, 14 hija iżgħar minn 15.

520
00:25:32,480 --> 00:25:36,430
Mela jekk huwa fil-siġra tagħna, huwa għandu
jkun f'dan il-qasam hawn.

521
00:25:36,430 --> 00:25:39,680
Għandu jkun għad-dritt ta '
10 u lejn ix-xellug tal-15.

522
00:25:39,680 --> 00:25:42,250
>> U hekk aħna jivverifikaw dan node.

523
00:25:42,250 --> 00:25:45,790
U yay, aħna ħadthom misjuba 14.

524
00:25:45,790 --> 00:25:46,760
Jien ma jmur biex jimxu permezz tiegħu.

525
00:25:46,760 --> 00:25:48,090
Iżda hawn l-kodiċi.

526
00:25:48,090 --> 00:25:49,690
Huwa attwalment relattivament
sempliċi,

527
00:25:49,690 --> 00:25:52,630
għaliex dan huwa rikursivi.

528
00:25:52,630 --> 00:25:55,420
Liema jista aħna nitolbuk tagħmel fuq kwizz?

529
00:25:55,420 --> 00:25:57,000
Nistgħu jgħidlek biex tikteb dan il-kodiċi.

530
00:25:57,000 --> 00:25:59,170
Nistgħu jgħidlek biex tħares lejn dan il-kodiċi
u timmodifika dan il-kodiċi u jispjegaw dak

531
00:25:59,170 --> 00:26:00,210
huwa qed jagħmel.

532
00:26:00,210 --> 00:26:00,390
Yeah.

533
00:26:00,390 --> 00:26:00,770
Mistoqsija?

534
00:26:00,770 --> 00:26:04,240
>> UDJENZA: Huma dawn slides ser ikunu
disponibbli kif kienu aħħar darba?

535
00:26:04,240 --> 00:26:04,740
>> R.J. Aquino: Iva.

536
00:26:04,740 --> 00:26:06,460
Allura dawn slides definittivament se
jiġu stazzjonati.

537
00:26:06,460 --> 00:26:08,640
>> UDJENZA: Huma qed attwalment stazzjonati
dritt issa fuq il-websajt.

538
00:26:08,640 --> 00:26:10,020
David biss għamlet dan.

539
00:26:10,020 --> 00:26:12,720
>> R.J. Aquino: Is-slides
dritt issa fuq il-websajt.

540
00:26:12,720 --> 00:26:16,420
I ser probabbilment garża ftit ta '
l-typos I nnutat u tiffissa minnhom.

541
00:26:16,420 --> 00:26:19,940
Iżda hemm kurrent
verżjoni fis-sit.

542
00:26:19,940 --> 00:26:21,820
Oħrajn affarijiet nistgħu nitolbuk tagħmel -

543
00:26:21,820 --> 00:26:23,790
jiktbu daħħal.

544
00:26:23,790 --> 00:26:27,490
Ikteb verżjoni iterattiv ta 'l-
funzjoni jirrikorri aħna biss wera inti

545
00:26:27,490 --> 00:26:32,520
jew jitkellem dwar dawn l-affarijiet, bħal fil-
paragrafi, fi kliem, fil-sentenzi.

546
00:26:32,520 --> 00:26:35,760
Tqabbil-ħinijiet run u jispjega
dak li inti tixtieq li tuża binarju

547
00:26:35,760 --> 00:26:39,200
siġra tfittxija għal minflok
hash tabella, per eżempju.

548
00:26:39,200 --> 00:26:43,580
>> Allura jifhmu dawn l-istrutturi
fuq livell pretty fond.

549
00:26:43,580 --> 00:26:47,440
Jifhmu kif jiktbu għalihom, kif
jużawhom, kif jitkellmu dwarhom.

550
00:26:47,440 --> 00:26:50,270
U tkun taf tkun kollha stabbiliti.

551
00:26:50,270 --> 00:26:50,630
Mistoqsija?

552
00:26:50,630 --> 00:26:55,070
>> UDJENZA: Meta int bil-miktub l-
siġra tfittxija binarju, kif taħseb li

553
00:26:55,070 --> 00:27:01,460
jiddeterminaw liema valur
jagħmilha bħala l-għerq?

554
00:27:01,460 --> 00:27:06,120
>> R.J. Aquino: Għalhekk il-kwistjoni kienet, liema
valur inti tagħmel bħala l-għerq?

555
00:27:06,120 --> 00:27:08,760
Jiddependi fuq kodiċi tiegħek, inti
jista 'jkollhom għerq globali.

556
00:27:08,760 --> 00:27:14,290
Allura inti jista 'jkollok probabbilment kellhom fl
pset6 tabella hash globali.

557
00:27:14,290 --> 00:27:18,640
Jew inti tista 'tgħaddi l-għerq
fl bħala argument.

558
00:27:18,640 --> 00:27:23,810
Allura dan tfittxija funzjoni hawn
jieħu argument a node *.

559
00:27:23,810 --> 00:27:27,420
U sabiex ikun x'ikun node inti jiġri li jkun
tħares lejn huwa l-waħda inti qed trattament

560
00:27:27,420 --> 00:27:31,510
bħala għerq tiegħek meta inti tgħaddi hija pulzieri

561
00:27:31,510 --> 00:27:32,320
U jien kollha stabbiliti.

562
00:27:32,320 --> 00:27:33,480
Dawk huma slides tiegħi.

563
00:27:33,480 --> 00:27:35,940
Il-persuna li jmiss jista 'jidħol swap
fil-laptop u mic.

564
00:27:35,940 --> 00:27:47,390

565
00:27:47,390 --> 00:27:49,760
>> ROB BOWDEN: I think I jista 'jkollhom
interpretat din id-domanda differenti.

566
00:27:49,760 --> 00:27:53,826
Imma jien interpretata bħala, jekk għandek
in-numri 1, 2, u 3, kif nistgħu

567
00:27:53,826 --> 00:27:56,720
taf biex tagħmel 2-għerq
kontra 1 jew 3?

568
00:27:56,720 --> 00:27:59,480
Jekk nagħmlu 2-għerq, allura huwa nicely
1 u 3 lejn ix-xellug u lemin.

569
00:27:59,480 --> 00:28:04,610
Imma jekk 1 hija l-għerq, allura huwa 1 lill-
top, 2-dritt, 3 lejn il-lemin.

570
00:28:04,610 --> 00:28:10,880
Allura billi default, inti ma tafx
dak li jagħmel l-għerq.

571
00:28:10,880 --> 00:28:15,400
U għal kull algoritmu aħna qed jistennew biex
jagħtik, biss l-ewwel ħaġa li għandek

572
00:28:15,400 --> 00:28:16,680
daħħal tkun l-għerq.

573
00:28:16,680 --> 00:28:19,890
Jew aħna'd jagħtuk siġra binarju li
diġà teżisti li għandha għerq.

574
00:28:19,890 --> 00:28:24,760
Iżda algoritmi oħra teżisti tali li
l-għerq se taġġorna, b'tali mod li jekk inti

575
00:28:24,760 --> 00:28:28,370
jispiċċaw fis-sitwazzjoni fejn huwa 1, 2,
3, ikun taġġorna awtomatikament

576
00:28:28,370 --> 00:28:30,900
jagħmlu 2-għerq ġdid, b'tali mod li
huwa għadu ibbilanċjat nicely.

577
00:28:30,900 --> 00:28:33,750

578
00:28:33,750 --> 00:28:34,833
>> ANGELA LI: Kessaħ.

579
00:28:34,833 --> 00:28:36,170
Hey, guys.

580
00:28:36,170 --> 00:28:37,810
Jien Angela.

581
00:28:37,810 --> 00:28:42,490
U jien ser biex jintemm off C tagħna
u mbagħad tmur fis xi wħud mill web tagħna

582
00:28:42,490 --> 00:28:43,120
teknoloġiji -

583
00:28:43,120 --> 00:28:46,570
HTTP, HTML, u CSS.

584
00:28:46,570 --> 00:28:49,610
Allura l-ewwel ħaġa hija buffer
attakki overflow.

585
00:28:49,610 --> 00:28:53,070
Mela ejja tagħti ħarsa lejn dan il-kodiċi.

586
00:28:53,070 --> 00:28:54,260
Huwa pjuttost sempliċi.

587
00:28:54,260 --> 00:28:55,460
Hemm foo funzjoni.

588
00:28:55,460 --> 00:28:56,990
U ma jerġax lura xejn.

589
00:28:56,990 --> 00:29:00,950
Iżda tieħu fil-pointer
għal string imsejħa bar.

590
00:29:00,950 --> 00:29:04,920
>> U li għaddej biex jiddikjara dan
buffer, li huwa karattru

591
00:29:04,920 --> 00:29:07,690
array li għandha 12 slots.

592
00:29:07,690 --> 00:29:11,730
U juża memcpy, li huwa biss
funzjoni li kopji minn indirizz wieħed

593
00:29:11,730 --> 00:29:12,910
għal ieħor.

594
00:29:12,910 --> 00:29:19,400
Allura dan qed tipprova li kopja fis
buffer tagħna minn kwalunkwe

595
00:29:19,400 --> 00:29:21,140
bar hija li tipponta lejn.

596
00:29:21,140 --> 00:29:24,640
Allura kull idea x'hemm ħażin
ma 'dan il-kodiċi?

597
00:29:24,640 --> 00:29:27,568

598
00:29:27,568 --> 00:29:30,830
>> UDJENZA: Jekk bar huwa itwal minn
C, dawn se jissostitwixxu.

599
00:29:30,830 --> 00:29:31,520
>> ANGELA LI: Yeah, eżattament.

600
00:29:31,520 --> 00:29:34,200
Għandna l-ebda garanzija li bar
se jkun inqas minn 12.

601
00:29:34,200 --> 00:29:36,080
Aħna biss għamel xi numru arbitrarju 12.

602
00:29:36,080 --> 00:29:38,380
U aħna kienu simili, ejja tama li
input utent tagħna huwa inqas minn

603
00:29:38,380 --> 00:29:40,440
12 karattri fit-tul.

604
00:29:40,440 --> 00:29:46,320
Allura f'dinja ideali, jekk input tagħna huwa
dejjem kif mistenni, allura aħna ser tingħata

605
00:29:46,320 --> 00:29:47,550
xi ħaġa simili, bonjour.

606
00:29:47,550 --> 00:29:48,920
C'est inqas minn 12-il karattru.

607
00:29:48,920 --> 00:29:51,870
Jiġrilha tinqara fis char c.

608
00:29:51,870 --> 00:29:53,280
U allura aħna nagħmlu xi ħaġa magħha.

609
00:29:53,280 --> 00:29:54,800
Hija ma verament kwistjoni.

610
00:29:54,800 --> 00:29:59,740
>> Iżda persuna malizzjużi jistgħu jagħmlu
xi ħaġa aktar bħal dan, fejn

611
00:29:59,740 --> 00:30:04,760
agħtina kwalunkwe bar hija li tipponta lejn,
li għaddej biex jindikaw din il-firxa enormi

612
00:30:04,760 --> 00:30:06,280
ta 'ftit A tal.

613
00:30:06,280 --> 00:30:10,680
U dan huwa mod itwal minn 12.

614
00:30:10,680 --> 00:30:13,830
Allura li għaddej biex tmur it-triq
down hawn biex fejn ir-ritorn

615
00:30:13,830 --> 00:30:15,420
indirizz użati biex ikunu.

616
00:30:15,420 --> 00:30:17,860
Mela ejja ngħidu din il-funzjoni
tissejjaħ foo.

617
00:30:17,860 --> 00:30:20,970
Forsi foo ġie mitlub minn xi oħra
funzjoni, li kienet tissejjaħ mill-prinċipali.

618
00:30:20,970 --> 00:30:24,890
Allura meta foo qed taħdem, jeħtieġ
li tkun taf fejn li jirritornaw għall.

619
00:30:24,890 --> 00:30:29,130
>> Jekk foo ġie mitlub minn xi funzjoni msemmija
baz, hija għandha tkun taf li huwa

620
00:30:29,130 --> 00:30:30,250
qbilna li jmorru lura għall baz.

621
00:30:30,250 --> 00:30:34,040
U dak hu li dan l-indirizz ta 'ritorn
stabbiliti hawn qed tgħidilna.

622
00:30:34,040 --> 00:30:38,340
Imma jekk aħna jissostitwixxu ma 'xi ieħor
indirizz, f'dan il-każ, dan huwa

623
00:30:38,340 --> 00:30:42,650
rappreżentazzjoni tal-indirizz fl-
bidunett ta 'din buffer, allura

624
00:30:42,650 --> 00:30:45,240
dak li attwalment jiġri huwa li
minflok jirritornaw lura lejn baz,

625
00:30:45,240 --> 00:30:48,470
li sejjaħ funzjoni tagħna, huwa biss
se jmorru għall-quddiem ta 'dan il-kodiċi.

626
00:30:48,470 --> 00:30:53,930
>> U jekk dan kien hemm minħabba
malizzjużi Hacker raġel daħal u

627
00:30:53,930 --> 00:30:56,820
injettat dan, allura forsi dan l-ammont
ta 'A ma tkunx attwalment A tal.

628
00:30:56,820 --> 00:31:02,030
U huwa attwalment biss kodiċi li pawżi
kompjuter tiegħek jew xi ħaġa.

629
00:31:02,030 --> 00:31:05,930
Allura biex tkun difensiva dwar din it-tip
ħaġa, inti għandek qatt jassumi li

630
00:31:05,930 --> 00:31:09,120
input utent ċertu
ammont ta 'karattri.

631
00:31:09,120 --> 00:31:13,310
Per eżempju, meta inti kienu qed jagħmlu
speller, inti qalulhom li kliem kienu

632
00:31:13,310 --> 00:31:15,580
biss se jkun ta '40 karattri
massimu twil.

633
00:31:15,580 --> 00:31:16,570
U li kienet tajba.

634
00:31:16,570 --> 00:31:20,150
>> Imma jekk le, allura inti għandek
kun żgur li taqra biss 45

635
00:31:20,150 --> 00:31:21,520
karattri fi żmien.

636
00:31:21,520 --> 00:31:24,430
Inkella, inti tista jissostitwixxu
buffer tiegħek.

637
00:31:24,430 --> 00:31:26,140
Kwalunkwe mistoqsijiet dwar dan.

638
00:31:26,140 --> 00:31:26,733
Yeah.

639
00:31:26,733 --> 00:31:28,850
>> UDJENZA: Tista 'biss jitkellmu
ftit aktar dwar dawn?

640
00:31:28,850 --> 00:31:29,790
>> ANGELA LI: Jiddispjacini.

641
00:31:29,790 --> 00:31:31,040
Iva.

642
00:31:31,040 --> 00:31:32,813

643
00:31:32,813 --> 00:31:35,870
>> UDJENZA: Il mic huwa biss għall-video.

644
00:31:35,870 --> 00:31:37,640
I se tipprova u l-proġett.

645
00:31:37,640 --> 00:31:39,900
Hi, guys.

646
00:31:39,900 --> 00:31:40,920
Appoġġ?

647
00:31:40,920 --> 00:31:45,330
Mela ejja jmorru fuq ftit affarijiet fil-
Librerija CS50, li inti kont qed tuża

648
00:31:45,330 --> 00:31:49,072
kollha semestru, l-aktar
tikseb input utent.

649
00:31:49,072 --> 00:31:53,140
Kif tafu, inti jinkludu l-CS50
librerija bi ftit tagħmel CS50.h, li

650
00:31:53,140 --> 00:31:55,660
fiha l-prototipi tal-
funzjonijiet li tista 'tuża, bħal

651
00:31:55,660 --> 00:31:58,640
GetString u GetInt, u
GetFloat, eċċetera.

652
00:31:58,640 --> 00:32:02,870
U hemm din il-linja waħda fil-CS50
librerija li jiddefinixxi sekwenza, li

653
00:32:02,870 --> 00:32:05,380
inti guys lkoll nafu minn issa
huwa biss char *.

654
00:32:05,380 --> 00:32:07,900
>> Iżda ejja tieħu Peek lejn
kif GetString xogħlijiet.

655
00:32:07,900 --> 00:32:10,010
Din hija verżjoni mqassra ħafna.

656
00:32:10,010 --> 00:32:15,090
Inti tista 'pull up-fajls librerija CS50
minn, I think, manuals.CS50.net.

657
00:32:15,090 --> 00:32:16,750
U inti tista 'taqra permezz
il-funzjoni effettiva.

658
00:32:16,750 --> 00:32:19,330
Iżda dan ikopri xi wħud
il-partijiet importanti.

659
00:32:19,330 --> 00:32:23,870
Allura ħloqna xi buffer
ma 'xi kapaċità.

660
00:32:23,870 --> 00:32:27,570
U dak li nagħmlu huwa irridu jiksbu karattru wieħed
fi żmien mid n standard.

661
00:32:27,570 --> 00:32:30,910
Li meta l-inputs utent
test fl-console.

662
00:32:30,910 --> 00:32:33,430
>> U hekk aħna qed tmur biex taqra fil-
karattru sakemm mhuwiex ġdida

663
00:32:33,430 --> 00:32:37,220
line u mhuwiex tmiem tal-fajl, li
hija t-tmiem ta 'input standard.

664
00:32:37,220 --> 00:32:45,690
U għal kull karattru li naqraw fi,
jekk dik il-karattru jispiċċa jżid

665
00:32:45,690 --> 00:32:50,120
għan-numru ta 'karattri aħna stajt taqra
fi u li hija aktar minn kapaċità tagħna,

666
00:32:50,120 --> 00:32:53,490
allura dak li nagħmlu huwa aħna biss resize tagħna
buffer b'tali mod li huwa darbtejn sakemm.

667
00:32:53,490 --> 00:32:56,950
Għalhekk għal darb'oħra, dan jipproteġi kontra buffer
attakki overflow, għaliex inti moqri

668
00:32:56,950 --> 00:32:58,315
karattru fi żmien.

669
00:32:58,315 --> 00:33:02,290
U jekk fi kwalunkwe punt inti taqra fl wisq
ħafna, inti biss jespandu buffer tiegħek.

670
00:33:02,290 --> 00:33:03,330
Inti immoltiplika lilha mill tnejn.

671
00:33:03,330 --> 00:33:05,510
U allura inti għandek aktar spazju.

672
00:33:05,510 --> 00:33:09,120
>> Inkella, inti biss żid
karattru biex jitnaqqas.

673
00:33:09,120 --> 00:33:15,080
U wara li tkun ħadthom taqra kollox il-
karattri, se tiċkien il-buffer

674
00:33:15,080 --> 00:33:18,510
lura għad-daqs normali, żid
terminatur null, u mbagħad jirritornaw.

675
00:33:18,510 --> 00:33:21,880

676
00:33:21,880 --> 00:33:24,960
Issa, ejja nħarsu lejn GetInt.

677
00:33:24,960 --> 00:33:27,700
Tista 'inti guys taqra dan?

678
00:33:27,700 --> 00:33:30,710
I jistgħu zoom daqsxejn.

679
00:33:30,710 --> 00:33:33,410

680
00:33:33,410 --> 00:33:34,660
I do not know kif il-kompjuters jaħdmu.

681
00:33:34,660 --> 00:33:40,840

682
00:33:40,840 --> 00:33:41,270
Qatt f'moħħu.

683
00:33:41,270 --> 00:33:42,520
I ma tistax zoom suppost.

684
00:33:42,520 --> 00:33:47,500

685
00:33:47,500 --> 00:33:48,770
>> Dan huwa verament diffiċli.

686
00:33:48,770 --> 00:33:49,180
Jien sorry.

687
00:33:49,180 --> 00:33:51,490
Ejja biss ħarsa lejn dan.

688
00:33:51,490 --> 00:33:57,140
Allura dak GetInt ma huwa l-ewwel taqra
fil string minn GetString, li

689
00:33:57,140 --> 00:33:59,250
konna implimentati qabel.

690
00:33:59,250 --> 00:34:02,945
U l-parti importanti li wieħed jinnota hawnhekk
hija jekk dan qsim li jispiċċa

691
00:34:02,945 --> 00:34:06,400
qari huwa simili ma attwalment string,
allura aħna biss jirritornaw INT_MAX li

692
00:34:06,400 --> 00:34:09,409
jirrappreżentaw falliment.

693
00:34:09,409 --> 00:34:12,645
Għalfejn nagħmlu ritorn INT_MAX minflok
ta negattiv 1 jew 1?

694
00:34:12,645 --> 00:34:13,895
Xi ideat?

695
00:34:13,895 --> 00:34:16,853

696
00:34:16,853 --> 00:34:19,350
>> UDJENZA: [inaudible]
negattiv 1 fuq waħda.

697
00:34:19,350 --> 00:34:20,070
>> ANGELA LI: Yeah, eżattament.

698
00:34:20,070 --> 00:34:24,560
Allura int mod aktar probabbli li biss trid
għal input 1 jew negattiva 1 meta imqanqla

699
00:34:24,560 --> 00:34:27,469
għal nth u tkun xi tkun Maxes nth.

700
00:34:27,469 --> 00:34:27,969
Huwa enormi.

701
00:34:27,969 --> 00:34:29,690
Inti probabilment mhux se tużah.

702
00:34:29,690 --> 00:34:32,690
Allura dan huwa bħal deċiżjoni disinn li
kun żgur li inti ma aċċidentalment

703
00:34:32,690 --> 00:34:38,540
ritorn żball jew inti ma jirritornawx
1, li jistgħu jiġu parsed

704
00:34:38,540 --> 00:34:41,199
bħala risposta korretta.

705
00:34:41,199 --> 00:34:45,110
Hekk jekk linja ma jeżistix,
nerġgħu lura INT-MAX.

706
00:34:45,110 --> 00:34:48,090
Inkella, nużaw sscanf,
li huwa simili scanf.

707
00:34:48,090 --> 00:34:49,449
Iżda jgħid minn string.

708
00:34:49,449 --> 00:34:54,310
>> U aħna għandna dan ifformattjat
spag, li huwa% i% c.

709
00:34:54,310 --> 00:34:57,440
U nippruvaw u jaqblu li ma
ikun x'ikun l-utent tana.

710
00:34:57,440 --> 00:35:01,420
Aħna rridu li l-numru ta 'affarijiet mqabbla
li tkun l-1, li jfisser li aħna biss

711
00:35:01,420 --> 00:35:04,940
verament irridu li jaqblu integer
mdawra minn forsi abjad

712
00:35:04,940 --> 00:35:06,840
ispazju, forsi le.

713
00:35:06,840 --> 00:35:10,710
F'dan il-każ, jekk inti tpoġġi xi ħaġa
bħal bar, bar ma taqbilx għal kollox,

714
00:35:10,710 --> 00:35:14,400
minħabba li jeħtieġ li jkun hemm
integer fil-bidu.

715
00:35:14,400 --> 00:35:17,060
Mela qatt sscan daru 0.

716
00:35:17,060 --> 00:35:19,640
Allura inti ma jirritornawx dan.

717
00:35:19,640 --> 00:35:23,850
>> Alternattivament, jekk inti tpoġġi xi ħaġa
simili 1, 2, 3, A, B, C, li logħbiet

718
00:35:23,850 --> 00:35:27,180
kemm il-integer iżda wkoll
l-karattru wara.

719
00:35:27,180 --> 00:35:29,990
Allura sscanf ser jirritorna 2, li
huwa wkoll mhux ideali.

720
00:35:29,990 --> 00:35:34,620
Inti ma tridx 1, 2, 3, A,
B, C biex tkun int valida.

721
00:35:34,620 --> 00:35:36,990
Allura li wkoll ma taħdimx.

722
00:35:36,990 --> 00:35:38,530
Imma ngħid li inti tpoġġi fil xi ħaġa bħal 50.

723
00:35:38,530 --> 00:35:42,460
Li se jaqblu mal-% i, li jfisser
se tikseb jinqara fis n.

724
00:35:42,460 --> 00:35:44,790
U issa, n se jkun fih in-numru 50.

725
00:35:44,790 --> 00:35:46,110
U allura inti tista 'tibagħtu lura.

726
00:35:46,110 --> 00:35:49,270
>> Inkella, inti hit Retry.

727
00:35:49,270 --> 00:35:55,790
U mbagħad hija biss tmur aktar mill-ġdid sakemm
ikollok input xieraq mill-utent.

728
00:35:55,790 --> 00:35:56,891
Kwalunkwe mistoqsijiet dwar dan?

729
00:35:56,891 --> 00:36:02,182
>> UDJENZA: Mela jekk inti kienu li jistampa
il-valur tal-GetInt fuq [inaudible]

730
00:36:02,182 --> 00:36:06,250
ma jkun biss l-eqreb numru sħiħ u max?

731
00:36:06,250 --> 00:36:07,440
>> ANGELA LI: Yeah.

732
00:36:07,440 --> 00:36:11,780
Mela jekk inti tuża GetInt, għandek tassumi
li inti ma tridx max nth li

733
00:36:11,780 --> 00:36:15,328
jkun input valida, għaliex int ser
li wieħed jassumi li dan kien ħażin.

734
00:36:15,328 --> 00:36:27,740
>> UDJENZA: Jekk aħna ma kellhiex char c u
xi ħadd tpoġġi fil 1, 2, 3, Sam, ikun jidher

735
00:36:27,740 --> 00:36:29,430
għadhom jaħdmu għal 1, 2, 3?

736
00:36:29,430 --> 00:36:29,750
>> ANGELA LI: I think ikun xogħol.

737
00:36:29,750 --> 00:36:33,340
Imma inti ma tridx 123Sam li
jkun input valida minn utent.

738
00:36:33,340 --> 00:36:34,670
Li mhux verament int.

739
00:36:34,670 --> 00:36:36,840
Għalhekk ma jidhirx ġust
parse dan bħala int.

740
00:36:36,840 --> 00:36:40,910

741
00:36:40,910 --> 00:36:42,160
OK.

742
00:36:42,160 --> 00:36:45,800
F'dak il-każ, let il-pass ta
fuq l-internet.

743
00:36:45,800 --> 00:36:49,120
Allura HTTP ma tkunx lingwa.

744
00:36:49,120 --> 00:36:56,060
HTTP huwa biss is-sett ta 'standards għall-
kif inti tibgħat affarijiet mill-klijenti,

745
00:36:56,060 --> 00:36:57,280
li int, li servers.

746
00:36:57,280 --> 00:36:59,730
C'est nies oħra fuq il-web.

747
00:36:59,730 --> 00:37:02,900
>> Allura HTTP stands għall Portugues
Trasferiment Protokoll.

748
00:37:02,900 --> 00:37:04,610
Hu l-qalb u ruħ
tal-web kollu.

749
00:37:04,610 --> 00:37:07,050
Il-parti ipertestwali biss
jirreferi għal HTML.

750
00:37:07,050 --> 00:37:10,690
It-trasferiment huwa klijenti bħal
inti se tibgħat talbiet biex

751
00:37:10,690 --> 00:37:13,060
servers, li jagħtu tweġibiet.

752
00:37:13,060 --> 00:37:16,380
U l-protokoll huwa biss, kif do
inti tistenna server li jaġixxu?

753
00:37:16,380 --> 00:37:19,960
U kif inti suppost li jaġixxu
tali li inti tista 'tissimplifika dan

754
00:37:19,960 --> 00:37:21,920
proċess ta 'komunikazzjoni?

755
00:37:21,920 --> 00:37:26,650
>> Jitlob HTTP tfittex ħafna bħal dan.

756
00:37:26,650 --> 00:37:28,070
IKOLLOK hija t-tip ta 'talba.

757
00:37:28,070 --> 00:37:31,220
Inti guys raw talbiet IKOLLOK
u talbiet POST.

758
00:37:31,220 --> 00:37:36,690
Din it-tieni ħaġa hemmhekk, / me, li l-
biss l-URI jew il-URL ta 'fejn inti

759
00:37:36,690 --> 00:37:38,140
jridu jmorru fil-ospitanti.

760
00:37:38,140 --> 00:37:44,140
Allura din it-talba qed jintalab l
paġna, bħal www.facebook.com / me.

761
00:37:44,140 --> 00:37:45,300
U huwa IKOLLOK talba.

762
00:37:45,300 --> 00:37:51,020
U allura dan HTTP/1.1, li jinsab biss
il-verżjoni ta 'HTTP inti qed tuża.

763
00:37:51,020 --> 00:37:55,020
Huwa kważi dejjem 1.1.

764
00:37:55,020 --> 00:37:56,880
>> U allura hemm mazz
ta 'għalf ieħor wisq.

765
00:37:56,880 --> 00:38:02,510
Inti tista 'attwalment tara dawn jekk inti
jiftħu tiegħek console meta int

766
00:38:02,510 --> 00:38:03,770
browsing il-web.

767
00:38:03,770 --> 00:38:07,290
Responses tfittex xi ħaġa
aktar bħal dan.

768
00:38:07,290 --> 00:38:09,620
Il-parti ta 'fuq hija, għal darb'oħra, il-
tip ta 'HTTP inti qed tuża

769
00:38:09,620 --> 00:38:12,310
segwit minn kodiċi status.

770
00:38:12,310 --> 00:38:14,700
Allura 200 OK huwa kollox jinħadmu.

771
00:38:14,700 --> 00:38:16,200
Hawnhekk huwa l-kontenut tiegħek.

772
00:38:16,200 --> 00:38:17,390
Kontenut tiegħek se ssegwi.

773
00:38:17,390 --> 00:38:21,730
U mbagħad se jgħidlek liema tip
tal-kontenut u għalf ieħor wisq.

774
00:38:21,730 --> 00:38:24,620
>> Il-kodiċijiet ta 'stat, hemm ftit
dawk importanti li għandek tkun taf.

775
00:38:24,620 --> 00:38:26,460
200 OK huwa simili deheb kollox ta.

776
00:38:26,460 --> 00:38:28,490
Kollox xogħlijiet.

777
00:38:28,490 --> 00:38:29,710
403 Projbit.

778
00:38:29,710 --> 00:38:32,910
Dan inti stajt probabbilment jidhru jekk insejt
li chmod xi ħaġa suppost.

779
00:38:32,910 --> 00:38:34,510
Dan ifisser li inti ma għandekx
l-permessi dritt għall-

780
00:38:34,510 --> 00:38:36,210
aċċess li fuq is-server.

781
00:38:36,210 --> 00:38:38,110
Huwa simili, l-ebda, inti ma tistax tara.

782
00:38:38,110 --> 00:38:39,780
404 ifisser li ħaġa ma teżistix.

783
00:38:39,780 --> 00:38:40,400
Ma nstabx.

784
00:38:40,400 --> 00:38:41,640
You ħadthom probabbilment jidhru li ħafna.

785
00:38:41,640 --> 00:38:45,510
>> 500 Error Server Intern huwa normalment
bħal xi ħaġa li marret ħażin fuq in-naħa

786
00:38:45,510 --> 00:38:46,460
tal-server.

787
00:38:46,460 --> 00:38:50,830
Allura meta inti kienu qed jimplimentaw pset7,
jekk kellek żbalji PHP, inti tista '

788
00:38:50,830 --> 00:38:53,890
fil-fatt imorru għall-paġna u ara
mazz sħiħ ta 'għalf żball PHP.

789
00:38:53,890 --> 00:38:56,900
Iżda li normalment ma jseħħx,
għaliex websajts ma verament irridu li

790
00:38:56,900 --> 00:38:58,830
jgħidlek il-għaliex is-sit tagħhom hija maqsuma.

791
00:38:58,830 --> 00:39:03,370
Huma ser probabbilment biss jirritornaw
500 Error Server Intern.

792
00:39:03,370 --> 00:39:06,120
>> U allura hemm 418 jien teapot.

793
00:39:06,120 --> 00:39:07,910
Hemm istorja kollha dwar
għaliex li l-ħaġa.

794
00:39:07,910 --> 00:39:09,860
Iżda int tista 'taqra dwar dan
fil-ħin tiegħek.

795
00:39:09,860 --> 00:39:11,450
Hemm mazz sħiħ ta '
kodiċi oħra istatus wisq.

796
00:39:11,450 --> 00:39:12,700
Imma dawn huma dawk
inti għandek tkun taf.

797
00:39:12,700 --> 00:39:15,660

798
00:39:15,660 --> 00:39:18,610
Mela ejja nitkellmu dwar HTML.

799
00:39:18,610 --> 00:39:22,180
HTML, ftakar, mhuwiex
lingwa ta 'programmar.

800
00:39:22,180 --> 00:39:23,510
Huwa lingwa markup.

801
00:39:23,510 --> 00:39:25,210
Dan ifisser li jiddeskrivi l-kontenut.

802
00:39:25,210 --> 00:39:30,440
Dan jgħidlek liema dokument HTML jistenna
simili jew le dak li jidher qisu

803
00:39:30,440 --> 00:39:32,230
iżda kif huwa strutturat.

804
00:39:32,230 --> 00:39:36,110
>> Għalhekk jiddefinixxi struttura u
semantika ta 'paġni tal-web.

805
00:39:36,110 --> 00:39:37,830
Huwa simili, dan huwa il-paragrafu.

806
00:39:37,830 --> 00:39:40,060
Din hija lista ordnat.

807
00:39:40,060 --> 00:39:42,360
Dan huwa simili taqsima tal-paġna tiegħi.

808
00:39:42,360 --> 00:39:43,260
Hawn it-titolu.

809
00:39:43,260 --> 00:39:44,310
Hija ma għalf bħal dik.

810
00:39:44,310 --> 00:39:48,770
Ma stil xi li, minħabba
dan huwa dak li inti tagħmel fil-CSS.

811
00:39:48,770 --> 00:39:50,270
U jidher qisu serje
tags tal nested.

812
00:39:50,270 --> 00:39:54,720
Allura biex jużaw eżempju ta 'verament bażiku
Paġna HTML, inti għandek l-DOCTYPE

813
00:39:54,720 --> 00:39:56,720
dikjarazzjoni up hemm.

814
00:39:56,720 --> 00:40:00,940
>> Din id-dikjarazzjoni DOCTYPE huwa
qal, aħna qed tuża HTML5.

815
00:40:00,940 --> 00:40:03,370
Imbagħad għandek l-tikketta HTML big.

816
00:40:03,370 --> 00:40:05,230
Fiha ras u korp.

817
00:40:05,230 --> 00:40:06,970
Fir-ras, għandek it-titolu.

818
00:40:06,970 --> 00:40:12,950
Dak hu li jmur fit-titolu
bar tal-browser tiegħek.

819
00:40:12,950 --> 00:40:15,810
Għandna tag link li rabtiet
fi folja stil estern.

820
00:40:15,810 --> 00:40:19,880
U allura għandna skript li jiġbed
minn JavaScript esterni kif ukoll.

821
00:40:19,880 --> 00:40:23,750
>> U mbagħad ġewwa l-ġisem tagħna huwa attwalment
dak gets murija fuq il-paġna.

822
00:40:23,750 --> 00:40:28,210
Imxejna ltqajna paragrafu u mbagħad
immaġni ġewwa dak il-paragrafu.

823
00:40:28,210 --> 00:40:32,000
Dan wieħed hija stampa ta 'frieħ tal-qtates.

824
00:40:32,000 --> 00:40:35,840
Avviż li l-immaġni
tag jagħlaq innifsu.

825
00:40:35,840 --> 00:40:41,760
Allura minflok ftuħ ma 'immaġni
u mbagħad tagħmel / image ieħor, inti

826
00:40:41,760 --> 00:40:47,500
biss ikollhom dan slash ftit
hawn, li jagħlaq dan.

827
00:40:47,500 --> 00:40:53,670
U l-tag immaġini għandha wkoll dan ewlenin
attribut valur imsejħa alt.

828
00:40:53,670 --> 00:40:56,970
Dak it-test alternattiv li
jiġri meta inti imbagħad jerġgħu fuqha.

829
00:40:56,970 --> 00:41:03,170
>> Elementi HTML Ħafna għandhom xi valur ewlieni
affarijiet li inti tista 'tagħti dan, diversi

830
00:41:03,170 --> 00:41:04,420
customization.

831
00:41:04,420 --> 00:41:06,230

832
00:41:06,230 --> 00:41:08,705
Yeah.

833
00:41:08,705 --> 00:41:09,955
>> UDJENZA: [inaudible].

834
00:41:09,955 --> 00:41:17,510

835
00:41:17,510 --> 00:41:19,680
>> ANGELA LI: Well, dan huwa l-
attribut tal-lametta.

836
00:41:19,680 --> 00:41:25,320
Mela jekk inti kienu qed jużaw jQuery, inti tista '
jagħmlu image.getAttribute tagħżel.

837
00:41:25,320 --> 00:41:27,930
U allura inti tista 'tfittex għall-
jiksbu l-attribut alt.

838
00:41:27,930 --> 00:41:31,040
U se jagħtik qtates.

839
00:41:31,040 --> 00:41:37,400
Jekk tiftakar formoli fl HTML, input
Elementi se jkollhom attributi isem.

840
00:41:37,400 --> 00:41:41,870
U dan huwa dak PHP juża biex jibgħat
talbiet meta bagħat formola.

841
00:41:41,870 --> 00:41:44,762

842
00:41:44,762 --> 00:41:50,064
>> UDJENZA: Ridt insemmi xi ħaġa
dwar kif jekk inti tuża kittens.jpg jew

843
00:41:50,064 --> 00:41:54,410
xi ħaġa li għandha l-nieqsa
fajl folders jew fajls oħra?

844
00:41:54,410 --> 00:41:54,750
>> ANGELA LI: Iva.

845
00:41:54,750 --> 00:41:57,010
Allura dan huwa dak li sejjaħ relattiva
triq, għaliex jien mhux qed nagħti

846
00:41:57,010 --> 00:41:58,740
inti l-traġitt sħiħ.

847
00:41:58,740 --> 00:42:05,160
Dan huwa simili meta C jekk inti tagħmel fopen
xi fajl, jekk inti hi.txt fopen, li

848
00:42:05,160 --> 00:42:09,190
hi.txt hija mistennija li tkun fl-istess
direttorju, sakemm inti tagħti aktar

849
00:42:09,190 --> 00:42:11,530
triq kumplessi.

850
00:42:11,530 --> 00:42:14,900
>> UDJENZA: Allura inti tista 'tispeċifika
li folder [inaudible]?

851
00:42:14,900 --> 00:42:17,660
>> ANGELA LI: Yeah.

852
00:42:17,660 --> 00:42:19,370
U inti tista 'tfittex up kif għandek tagħmel dan.

853
00:42:19,370 --> 00:42:23,480
Imma jekk jien ridt li tikseb kittens.jpg out
tad-direttorju parent, nixtieq nagħmel

854
00:42:23,480 --> 00:42:24,730
.. / Kittens.jpg.

855
00:42:24,730 --> 00:42:29,680

856
00:42:29,680 --> 00:42:30,930
Yeah.

857
00:42:30,930 --> 00:42:32,960

858
00:42:32,960 --> 00:42:33,760
Jiddispjacini.

859
00:42:33,760 --> 00:42:34,045
Yeah.

860
00:42:34,045 --> 00:42:35,700
Oh bniedem, I nesa l-kwistjoni.

861
00:42:35,700 --> 00:42:36,460
Liema kienet il-kwistjoni?

862
00:42:36,460 --> 00:42:39,570
Oh, il-kwistjoni kienet hija, kittens.jpg
mistenni li jkun fl-istess direttorju?

863
00:42:39,570 --> 00:42:40,630
U f'dan il-każ, huwa.

864
00:42:40,630 --> 00:42:44,030
Iżda int tista 'wkoll tagħti triq ċerti
tali li ma għandhom ikunu.

865
00:42:44,030 --> 00:42:47,100

866
00:42:47,100 --> 00:42:48,350
Tajba?

867
00:42:48,350 --> 00:42:50,190

868
00:42:50,190 --> 00:42:51,350
>> CSS.

869
00:42:51,350 --> 00:42:55,420
Allura CSS, bħal HTML, mhuwiex
lingwa ta 'programmar.

870
00:42:55,420 --> 00:42:58,250
CSS huwa biss sensiela ta 'regoli grafika.

871
00:42:58,250 --> 00:43:00,130
Hija tirrappreżenta Cascading Style Sheets.

872
00:43:00,130 --> 00:43:03,910
U tużah flimkien
ma HTML għall-paġni stil.

873
00:43:03,910 --> 00:43:08,140
Allura hemm tliet modi
inti tista 'tinkludi dan.

874
00:43:08,140 --> 00:43:11,950
Mod wieħed kif tista 'tagħmel dan huwa fir-ras
porzjon ta HTML tiegħek, inti tista 'sempliċement

875
00:43:11,950 --> 00:43:15,410
tiftaħ tag stil u mbagħad stick
xi CSS regoli fil hemmhekk.

876
00:43:15,410 --> 00:43:16,759
Huwa pjuttost OK.

877
00:43:16,759 --> 00:43:17,228
Yeah.

878
00:43:17,228 --> 00:43:21,449
>> UDJENZA: Tista 'tpoġġi dawk
tags stil fl bejn, ejja

879
00:43:21,449 --> 00:43:22,860
jiġifieri, ġisem u / body.

880
00:43:22,860 --> 00:43:27,400
U allura inti tkun grafika
biss fil-ġisem.

881
00:43:27,400 --> 00:43:28,840
>> ANGELA LI: Inti tista '.

882
00:43:28,840 --> 00:43:29,590
Hija inneħħu xogħol.

883
00:43:29,590 --> 00:43:33,990
Imma inti ma għandhom, minħabba l-grafika hija
tip tal-metadata li għandhom imorru fil-

884
00:43:33,990 --> 00:43:35,890
il-kap tad-dokument tiegħek.

885
00:43:35,890 --> 00:43:38,280
Korp għandhom verament ikollhom biss
dak li fil-fatt se

886
00:43:38,280 --> 00:43:39,420
juru up fuq il-paġna tiegħek.

887
00:43:39,420 --> 00:43:42,155
>> UDJENZA: Allura youd tpoġġi stil
fir-ras istil tal-

888
00:43:42,155 --> 00:43:43,930
paġna web kollu, id-dritt?

889
00:43:43,930 --> 00:43:44,300
>> ANGELA LI: Yeah.

890
00:43:44,300 --> 00:43:50,470
Allura tqegħid stil hawn, dawn ir-regoli CSS
se japplikaw għall-paġna kollha bbażati fuq

891
00:43:50,470 --> 00:43:52,100
seletturi tagħhom.

892
00:43:52,100 --> 00:43:57,090
Allura l-aħjar mod biex tagħmel dan huwa minflok
li jkollhom tag stil fir-ras,

893
00:43:57,090 --> 00:44:00,430
għandek din link għal stil estern
karta bħal I wera inti fil-

894
00:44:00,430 --> 00:44:01,980
eżempju preċedenti.

895
00:44:01,980 --> 00:44:05,920
X'inhu dan ma huwa tipprova u ssib l-
fajl style.css u mbagħad jiġbed

896
00:44:05,920 --> 00:44:08,470
fi u użi li bħala l-
stili għall-paġna.

897
00:44:08,470 --> 00:44:10,500
U style.css tiegħek kieku
biss ħarsa bħal dan.

898
00:44:10,500 --> 00:44:13,330
Ikun biss mazz ta 'CSS.

899
00:44:13,330 --> 00:44:16,210
>> U fl-aħħarnett, hemm mod ieħor inti
jistgħu jinkludu CSS, li int verament

900
00:44:16,210 --> 00:44:17,480
m'għandux qatt do.

901
00:44:17,480 --> 00:44:18,950
Huwa grafika inline sejħa.

902
00:44:18,950 --> 00:44:22,650
U hekk kull element HTML jistgħu wkoll
tieħu attribut stil.

903
00:44:22,650 --> 00:44:26,320
U mbagħad f'dak attribut istil,
inti tista 'tagħtiha regoli CSS.

904
00:44:26,320 --> 00:44:29,140
Allura f'dan il-każ, irrispettivament div jien
tiddefinixxi dritt hawn, li għaddej biex

905
00:44:29,140 --> 00:44:32,580
jkollhom sfond iswed u
kulur test abjad.

906
00:44:32,580 --> 00:44:35,620
Imma inti m'għandekx tagħmel dan, għaliex dak
dan ma huwa li tqiegħed grafika tiegħek

907
00:44:35,620 --> 00:44:36,850
ġewwa HTML tiegħek.

908
00:44:36,850 --> 00:44:40,530
>> U naf konna qed nitkellmu dwar HTML
huwa istruttura u CSS huwa stil.

909
00:44:40,530 --> 00:44:42,790
Jekk inti tagħmel dan, taħlitiet
flimkien.

910
00:44:42,790 --> 00:44:44,550
U m'humiex nodfa ħafna.

911
00:44:44,550 --> 00:44:45,800
Allura ma tagħmel dan.

912
00:44:45,800 --> 00:44:47,690

913
00:44:47,690 --> 00:44:52,100
Bl-użu eżempju ta 'CSS, hemm, aħna
biss jagħżlu l-korp ta 'l-HTML

914
00:44:52,100 --> 00:44:52,380
dokumentarja.

915
00:44:52,380 --> 00:44:55,110
U aħna qed simili, ta kollox
se tkun Comic Sans.

916
00:44:55,110 --> 00:44:57,290
I wkoll ma jirrakkomandaw dan.

917
00:44:57,290 --> 00:44:59,940
Iżda int tista 'tagħmel dan.

918
00:44:59,940 --> 00:45:03,140
>> It-tieni regola dritt hawn, li għaddej
biex jagħżlu l-element fuq l-

919
00:45:03,140 --> 00:45:04,880
paġna ma ID prinċipali.

920
00:45:04,880 --> 00:45:11,690
Sabiex ikun x'ikun HTML element, I qal ID
= Ewlenija, jien ser jagħti li

921
00:45:11,690 --> 00:45:16,020
Marġini 20-pixel u tallinja kollox,
it-test kollu, għaċ-ċentru.

922
00:45:16,020 --> 00:45:19,030
L-aħħar ħaġa jagħżel skond il-klassi CSS.

923
00:45:19,030 --> 00:45:24,450
Allura kull element fuq il-paġna li I taw
klassi taqsima, jien ser jagħmilha

924
00:45:24,450 --> 00:45:26,602
kulur fl-isfond ta 'dawl blu.

925
00:45:26,602 --> 00:45:29,380

926
00:45:29,380 --> 00:45:30,040
Yep.

927
00:45:30,040 --> 00:45:30,700
Li kollox sibt.

928
00:45:30,700 --> 00:45:30,890
Mistoqsija?

929
00:45:30,890 --> 00:45:34,020
>> UDJENZA: X'tagħmel l-hashtag
qabel prinċipali do?

930
00:45:34,020 --> 00:45:36,310
>> ANGELA LI: Il-kwistjoni hija, dak li ma
l-hashtag qabel do prinċipali?

931
00:45:36,310 --> 00:45:40,770
F'dan il-każ, il-hash fi
CSS ifisser tagħżel minn ID.

932
00:45:40,770 --> 00:45:47,490
Hekk jekk I kellhom xi element HTML, bħal
saret distinzjoni = prinċipali, jagħżel regola dan CSS

933
00:45:47,490 --> 00:45:49,260
il-ħaġa ma ID prinċipali.

934
00:45:49,260 --> 00:45:53,940
U l-istess, il-perjodu quddiem
taqsima hu li tagħżel skont il-klassi CSS jew

935
00:45:53,940 --> 00:45:56,558
jagħżel bi klassi HTML.

936
00:45:56,558 --> 00:46:00,940
>> UDJENZA: Għaliex hemm għandu qabel
6 kulur fl-isfond?

937
00:46:00,940 --> 00:46:01,270
>> ANGELA LI: Yeah.

938
00:46:01,270 --> 00:46:03,360
Għalhekk il-kwistjoni hija, għaliex hemm
a hash qabel l-6?

939
00:46:03,360 --> 00:46:05,320
Dan huwa differenti minn dak hash.

940
00:46:05,320 --> 00:46:09,500
Dan ifisser li int tagħti
kulur hexadecimal.

941
00:46:09,500 --> 00:46:14,260
Kuluri Allura hex, dan biss
jirrappreżenta kulur.

942
00:46:14,260 --> 00:46:17,860
U tiftakar triples RGB meta
għamilt l pset forensika?

943
00:46:17,860 --> 00:46:18,770
Dan huwa simili.

944
00:46:18,770 --> 00:46:21,590
L-ewwel żewġ ċifri jirrappreżentaw
kemm aħmar huwa fil-kulur.

945
00:46:21,590 --> 00:46:23,260
T-tieni tnejn jirrappreżentaw
kemm aħdar.

946
00:46:23,260 --> 00:46:25,450
U t-tielet jirrappreżenta
kemm blu.

947
00:46:25,450 --> 00:46:30,060
U l-hash huwa dan se
li jirrappreżentaw kulur.

948
00:46:30,060 --> 00:46:35,660
>> Allura xejn minn 0, 0, 0, 0, 0, 0
sa F, F, F, F, F, F hija valida.

949
00:46:35,660 --> 00:46:39,550
Huwa xi kulur validi li jistgħu
'tintwera mill-browser tiegħek.

950
00:46:39,550 --> 00:46:39,790
Mistoqsija?

951
00:46:39,790 --> 00:46:43,590
>> UDJENZA: X'hemm differenza bejn
użu minn ID u skond il-klassi?

952
00:46:43,590 --> 00:46:46,470
>> ANGELA LI: Il-kwistjoni huwa dak
id-differenza bejn

953
00:46:46,470 --> 00:46:48,950
użu minn ID u l-klassi?

954
00:46:48,950 --> 00:46:54,390
Inti jista 'jkollhom biss element wieħed fi
Dokument HTML li għandha ID partikolari.

955
00:46:54,390 --> 00:46:58,660
Allura biss ħaġa waħda fuq il-paġna tiegħi
huwa permess li jkun ID prinċipali.

956
00:46:58,660 --> 00:47:02,580
Allura inti tagħmel użu minnha għal dan huwa l-header.

957
00:47:02,580 --> 00:47:03,850
Din hija l-navigazzjoni.

958
00:47:03,850 --> 00:47:05,230
Dan huwa l-footer.

959
00:47:05,230 --> 00:47:09,070
Klassijiet huma differenti, għaliex inti tista '
japplikaw klassijiet elementi HTML kif ħafna

960
00:47:09,070 --> 00:47:10,100
kif tixtieq.

961
00:47:10,100 --> 00:47:15,860
>> Hekk per eżempju, I ma taqsima klassi,
għaliex hemm probabbilment aktar minn wieħed

962
00:47:15,860 --> 00:47:17,540
taqsima fuq il-paġna tiegħi.

963
00:47:17,540 --> 00:47:20,200
Int biss permessi li jkollhom bħala ħafna
elementi fuq il-paġna bl-istess

964
00:47:20,200 --> 00:47:23,190
klassi iżda wieħed biss minn ċerti ID.

965
00:47:23,190 --> 00:47:25,600
>> UDJENZA: Allura l-dot tirrappreżenta
il-klassi?

966
00:47:25,600 --> 00:47:26,090
>> ANGELA LI: Yeah.

967
00:47:26,090 --> 00:47:27,380
A dot jirrappreżenta klassi.

968
00:47:27,380 --> 00:47:29,990

969
00:47:29,990 --> 00:47:31,540
Kessaħ.

970
00:47:31,540 --> 00:47:32,370
Li kollox stajt ltqajna, guys.

971
00:47:32,370 --> 00:47:33,544
Grazzi.

972
00:47:33,544 --> 00:48:13,380
>> [Applause]

973
00:48:13,380 --> 00:48:14,290
>> ZAMYLA Chan: Hi, kulħadd.

974
00:48:14,290 --> 00:48:14,880
Jien Zamyla.

975
00:48:14,880 --> 00:48:18,830
Jien ser tkun tkopri PHP,
MVC, u SQL illum.

976
00:48:18,830 --> 00:48:22,350

977
00:48:22,350 --> 00:48:26,110
A lott tal-materjal li jien ser tkun
kopertura se tkun pretty ħafna

978
00:48:26,110 --> 00:48:29,100
dritt barra mill pset7.

979
00:48:29,100 --> 00:48:29,700
Kull dritt.

980
00:48:29,700 --> 00:48:31,180
Allura dak li huwa PHP?

981
00:48:31,180 --> 00:48:35,150
PHP stands għall Portugues PHP
Preprocessor.

982
00:48:35,150 --> 00:48:38,740
Għalhekk, fih innifsu, huwa rikursivi
isem, li huwa pretty jibred.

983
00:48:38,740 --> 00:48:42,220
PHP hija lingwa scripting server-ġenb,
u jipprovdi l-backend

984
00:48:42,220 --> 00:48:44,610
u l-irfid loġiku
tal-websajt tagħna.

985
00:48:44,610 --> 00:48:48,520
>> Allura Angela tkellem ħafna dwar il-HTML
u CSS li se jagħmlu l-istruttura

986
00:48:48,520 --> 00:48:49,530
tal-websajt.

987
00:48:49,530 --> 00:48:53,210
Imma x'jiġri jekk inti tixtieq li bidla li
kontenut dinamiku jew jekk din tvarja

988
00:48:53,210 --> 00:48:55,240
ibbażata fuq l-utent jew
ċerti kondizzjonijiet?

989
00:48:55,240 --> 00:48:57,060
Li meta PHP taqa pulzieri

990
00:48:57,060 --> 00:49:02,610
Issa, tipikament, PHP jista 'jieħu ftit
inqas linji biex jimplimentaw l-istess ħaġa

991
00:49:02,610 --> 00:49:07,380
fl C. Dan għaliex PHP mankijiet memorja
ġestjoni għall-programmer,

992
00:49:07,380 --> 00:49:11,170
kuntrarju us jkollhom malloc
ħielsa, affarijiet bħal dik.

993
00:49:11,170 --> 00:49:15,430
>> Iżda peress PHP huwa interpretattiva
lingwa, tipikament, jista 'jesegwixxi

994
00:49:15,430 --> 00:49:19,540
ftit aktar bil-mod minn C, li
hija lingwa kkompilata.

995
00:49:19,540 --> 00:49:23,150
Għaliex aħna qed jiċċaqilqu programmazzjoni
lingwi, ejja nħarsu lejn kif il-

996
00:49:23,150 --> 00:49:24,570
sintassi se jkunu differenti.

997
00:49:24,570 --> 00:49:28,770
Ejja ikunu attenti ħafna li ma
titħawwad ma 'dan.

998
00:49:28,770 --> 00:49:33,750
Allura ma sintassi PHP, jekk inti
embedding PHP tiegħek ġewwa ta 'HTML

999
00:49:33,750 --> 00:49:40,430
fajl jew fi ħdan. fajl PHP innifsu, inti
tehmeż il-kodiċi fil-miftuħ

1000
00:49:40,430 --> 00:49:45,270
PHP u l-tags PHP magħluqa bħall-
ġej, simili fuq l-iskrin.

1001
00:49:45,270 --> 00:49:46,660
>> Varjabbli fil PHP.

1002
00:49:46,660 --> 00:49:51,490
Kull varjabbli waħda ser jibda mal
is-sinjal $ segwit bl-isem ta '

1003
00:49:51,490 --> 00:49:53,150
varjabbli tiegħek.

1004
00:49:53,150 --> 00:49:56,530
Issa, varjabbli fil PHP huma laxk ittajpjat,
li jfisser li inti m'għandekx bżonn

1005
00:49:56,530 --> 00:50:00,030
biex jindikaw liema dejta tat-tip
huwa meta int tiddikjarah.

1006
00:50:00,030 --> 00:50:03,505
Madankollu, dan ma jfissirx li dawn
ma jkollhom xi tipi f'kull.

1007
00:50:03,505 --> 00:50:09,370
Mela jekk jien niddikjara varjabbli u biss sett
huwa ugwali għal 1, u mbagħad niddikjara

1008
00:50:09,370 --> 00:50:15,140
varjabbli ieħor, huwa stabbilit ugwali għal "1"
u mbagħad ieħor wieħed 1.0, ukoll,

1009
00:50:15,140 --> 00:50:19,410
skond it-tip ta 'ugwaljanza
operaturi I-użu, jekk irrid li jqabblu

1010
00:50:19,410 --> 00:50:21,830
fit-tipi kollha, imbagħad
dawn ser ikunu ugwali.

1011
00:50:21,830 --> 00:50:25,570
Imma jekk jien tixtieq li tagħmel ċert li l-
tipi huma ugwali, PHP xorta tista 'tagħmel

1012
00:50:25,570 --> 00:50:28,690
li, anke jekk aħna ma jindikawx
liema tip huwa meta aħna

1013
00:50:28,690 --> 00:50:31,170
ewwel tagħmel il-fajl.

1014
00:50:31,170 --> 00:50:33,990
>> Issa, fil-PHP, anke jekk aħna
jaqilbu minn programmazzjoni

1015
00:50:33,990 --> 00:50:39,360
lingwi minn C, aħna xorta jkollhom tagħna
trusty jekk il-kundizzjoni, biss bħal dan.

1016
00:50:39,360 --> 00:50:43,270
Għad għandna loops filwaqt tagħna, ftit
bħal dan, fejn inti tpoġġi fil tiegħek

1017
00:50:43,270 --> 00:50:47,300
kondizzjoni u allura l-
korp tal-linja.

1018
00:50:47,300 --> 00:50:50,360
U allura aħna wkoll tagħna għall-loop,
li tipikament tidher bħal dan.

1019
00:50:50,360 --> 00:50:55,330
Mela jekk jien ridt li jtenni fuq kollha
disa psets u jissottomettu u sejħa

1020
00:50:55,330 --> 00:50:58,960
submitPset funzjoni, imbagħad I tista 'tagħmel dan
hawn, li inti guys kollha

1021
00:50:58,960 --> 00:50:59,830
jsir minn dan il-punt.

1022
00:50:59,830 --> 00:51:01,080
Congratulations, mill-mod.

1023
00:51:01,080 --> 00:51:04,560

1024
00:51:04,560 --> 00:51:07,550
>> Għall-kamera, in-nies
qal, grazie.

1025
00:51:07,550 --> 00:51:11,220
Issa, jekk inti ma jridux biss jużaw dan
għall-loop, allura PHP attwalment ukoll

1026
00:51:11,220 --> 00:51:13,580
jkun affarijiet imsejħa loops foreach.

1027
00:51:13,580 --> 00:51:22,210
Hekk jekk I kellhom firxa ta 'numri interi, 0
sa 8, maħżuna fil-psets array,

1028
00:51:22,210 --> 00:51:27,290
imbagħad I jista 'jkollhom loop foreach li
ttenni minn kull numru fil psets.

1029
00:51:27,290 --> 00:51:30,640
U mbagħad I tista 'sejħa l-istess
jiffunzjonaw tmien darbiet,

1030
00:51:30,640 --> 00:51:31,910
bħad I did qabel.

1031
00:51:31,910 --> 00:51:36,480
Allura dan għal kull loop huwa sabiħ, għax
inti ma għandekx li jekk inti ma tafx

1032
00:51:36,480 --> 00:51:39,470
it-tul eżatt tal-array li inti
jkunu, imbagħad bl-użu din loop foreach

1033
00:51:39,470 --> 00:51:42,800
se jieħdu ħsieb ta 'dan għalik.

1034
00:51:42,800 --> 00:51:45,410
>> So I għamel psets bħala firxa.

1035
00:51:45,410 --> 00:51:46,700
Ejja nħarsu lejn dak.

1036
00:51:46,700 --> 00:51:51,290
Arrays fl PHP huma tipikament l-istess bħal
dawk li kellna fis-C, fejn

1037
00:51:51,290 --> 00:51:52,960
inti tista 'tiddikjara firxa.

1038
00:51:52,960 --> 00:51:59,200
U hawn, I tista 'tiddikjara firxa vojta
u mbagħad jibnu dinamikament billi juża

1039
00:51:59,200 --> 00:52:00,850
indiċijiet kif interi.

1040
00:52:00,850 --> 00:52:04,140
Allura indiċi 0, jien ser taħżen
integer jismu 1.

1041
00:52:04,140 --> 00:52:09,210
Fil indiċi 1 tal-lista tiegħi, jien ser
biex jaħżnu l-valur 2.

1042
00:52:09,210 --> 00:52:12,670
U fit-tielet indiċi iżda l-
tieni numru, jien ser

1043
00:52:12,670 --> 00:52:14,870
jaħżen in-numru 12.

1044
00:52:14,870 --> 00:52:17,250
>> Issa, dan huwa multa li
jaħdem jaħdem tajjeb.

1045
00:52:17,250 --> 00:52:21,310
Imma jgħidu huwa importanti li lili
dak li kull indiċi istivi.

1046
00:52:21,310 --> 00:52:24,500
Għalija, l-indiċi 0 ifisser kif
qtates ħafna I jkollhom.

1047
00:52:24,500 --> 00:52:27,400
U l-indiċi 1 ifisser kif
ħafna Kokki I jkollhom.

1048
00:52:27,400 --> 00:52:29,450
U dak li jmiss ifisser klieb kemm.

1049
00:52:29,450 --> 00:52:34,140
Well, allura li jiġi speċifikat li, minflok
ta 'wara li tiftakar 0 tirrigwarda

1050
00:52:34,140 --> 00:52:38,090
qtates u 1 sa Kokki, I jistgħu jużaw
arrays assoċjattiva, li jfisser li

1051
00:52:38,090 --> 00:52:42,260
minflok numri interi bħala indiċi tiegħi,
I jistgħu attwalment jużaw kordi.

1052
00:52:42,260 --> 00:52:43,290
>> Allura dan huwa pjuttost utli.

1053
00:52:43,290 --> 00:52:47,130
U inti stajt bażikament biss sostitwit
l-interi bl-kordi.

1054
00:52:47,130 --> 00:52:50,074
U hemm ikollok xi
firxa assoċjattiva.

1055
00:52:50,074 --> 00:52:51,930
Yeah.

1056
00:52:51,930 --> 00:52:55,800
>> UDJENZA: Hemm raġuni għaliex hemm
underscore għat-tieni

1057
00:52:55,800 --> 00:52:58,750
parti, minħabba lista tiegħi għandu l-array.

1058
00:52:58,750 --> 00:53:01,330
>> ZAMYLA Chan: Il-kwistjoni kienet, hija
hemm raġuni għaliex hemm xi

1059
00:53:01,330 --> 00:53:03,320
underscore bejn tiegħi u lista?

1060
00:53:03,320 --> 00:53:03,610
Nru.

1061
00:53:03,610 --> 00:53:06,878
Thats kemm jien tismija
varjabbli tiegħi.

1062
00:53:06,878 --> 00:53:11,670
>> UDJENZA: Fuq l-ewwel
line, huwa kelma waħda.

1063
00:53:11,670 --> 00:53:12,560
>> ZAMYLA Chan: apologies tiegħi.

1064
00:53:12,560 --> 00:53:13,410
I ser jiffissaw dak.

1065
00:53:13,410 --> 00:53:13,620
Yeah.

1066
00:53:13,620 --> 00:53:15,460
Huma għandhom ikunu l-istess isem varjabbli.

1067
00:53:15,460 --> 00:53:16,710
Qabda tajba.

1068
00:53:16,710 --> 00:53:19,640

1069
00:53:19,640 --> 00:53:19,950
OK.

1070
00:53:19,950 --> 00:53:22,610
Mela ejja jimxu fuq string
konkatenazzjoni.

1071
00:53:22,610 --> 00:53:27,500
Jekk jien ridt li tieħu żewġ kordi,
imbagħad I jistgħu concatenate minnhom

1072
00:53:27,500 --> 00:53:28,550
mal-operatur dot.

1073
00:53:28,550 --> 00:53:32,440
Mela jekk ikolli Milo bħala l-ewwel isem
u Banana bħala isem aħħar, imbagħad

1074
00:53:32,440 --> 00:53:35,430
concatenating mal-operatur dot u
imbagħad tqegħid spazju bejn

1075
00:53:35,430 --> 00:53:39,210
se tagħmel string li fih Milo
Banana, li I jistgħu mbagħad eku jew,

1076
00:53:39,210 --> 00:53:41,280
pjuttost, jistampa.

1077
00:53:41,280 --> 00:53:44,465
>> Taħdit ta 'eku, ejja nitkellmu
dwar utli ftit -

1078
00:53:44,465 --> 00:53:44,920
oops.

1079
00:53:44,920 --> 00:53:46,030
Jien sorry.

1080
00:53:46,030 --> 00:53:52,920
A funzjonijiet PHP utli ftit.

1081
00:53:52,920 --> 00:53:56,240
Allura aħna għandna l -

1082
00:53:56,240 --> 00:53:57,444
diffikultajiet tekniċi.

1083
00:53:57,444 --> 00:53:58,694
Sekonda.

1084
00:53:58,694 --> 00:54:16,960

1085
00:54:16,960 --> 00:54:19,550
I bagħtitu.

1086
00:54:19,550 --> 00:54:22,320
Problemi bil-PowerPoint.

1087
00:54:22,320 --> 00:54:29,200
U aħna lura ma 'funzjonijiet PHP.

1088
00:54:29,200 --> 00:54:32,010

1089
00:54:32,010 --> 00:54:35,150
U aħna lura ma 'funzjonijiet PHP.

1090
00:54:35,150 --> 00:54:39,890
>> Allura aħna għandna l jeħtieġu funzjoni, fejn
jekk inti tgħaddi fil-fajl, hawn huwa biss

1091
00:54:39,890 --> 00:54:43,300
eżempju ta 'fajl li
I jista 'jgħaddi pulzieri

1092
00:54:43,300 --> 00:54:47,605
Allura li se jinkludi l-kodiċi PHP
minn dan il-fajl li I jindikaw.

1093
00:54:47,605 --> 00:54:49,940
U se jivvaluta dik pulzieri

1094
00:54:49,940 --> 00:54:54,450
Imbagħad irridu wkoll eku, li
huwa parallel għall printf.

1095
00:54:54,450 --> 00:54:57,710
Ħruġ huwa parallel li jinkiser,
li toħroġ mill-blokk ta '

1096
00:54:57,710 --> 00:54:58,570
kodiċi li int pulzieri

1097
00:54:58,570 --> 00:55:03,180
U mbagħad kontrolli vojta jekk mogħti
varjabbli huwa simili null jew żero jew

1098
00:55:03,180 --> 00:55:08,482
dak kollu li huwa ekwiparat ma 'li tkun vojta.

1099
00:55:08,482 --> 00:55:09,438
Yeah.

1100
00:55:09,438 --> 00:55:15,341
>> UDJENZA: Għall-konkatenazzjoni string
dot operatur wieħed, fil-PHP, huwa li l-

1101
00:55:15,341 --> 00:55:20,158
istess bħal fl JavaScript fejn huwa użu
l-dot għall konkatenazzjoni ifisser plus?

1102
00:55:20,158 --> 00:55:27,440
Allura għal isem sħiħ, jista 'jkollok dollaru
tiffirma l-ewwel + u mbagħad + aħħar?

1103
00:55:27,440 --> 00:55:27,720
>> ZAMYLA Chan: Yeah.

1104
00:55:27,720 --> 00:55:32,150
Għalhekk il-kwistjoni kienet dwar jekk fil-PHP aħna
jistgħu jużaw l-istess konkatenazzjoni string

1105
00:55:32,150 --> 00:55:33,890
bħal fil JavaScript mal-pluses.

1106
00:55:33,890 --> 00:55:35,410
U Joseph se jsibu rwieħhom li aktar tard.

1107
00:55:35,410 --> 00:55:36,620
Naħseb li għandha slide fuq dan.

1108
00:55:36,620 --> 00:55:37,570
Attwalment, huwa differenti.

1109
00:55:37,570 --> 00:55:41,310
Għalhekk fl JavaScript, inti għandek bżonn tuża
il-plus li concatenate kordi.

1110
00:55:41,310 --> 00:55:43,280
U fil-PHP, inti għandek
jużaw l-operatur dot.

1111
00:55:43,280 --> 00:55:44,530
Allura jkunu differenti.

1112
00:55:44,530 --> 00:55:46,680

1113
00:55:46,680 --> 00:55:46,910
>> OK.

1114
00:55:46,910 --> 00:55:49,500
Allura issa li aħna ħadthom koperti kollha
dan PHP, fejn ma dan

1115
00:55:49,500 --> 00:55:50,490
verament jaqgħu fil handy?

1116
00:55:50,490 --> 00:55:54,470
Ukoll, niġu fil handy meta aħna
jistgħu jikkombinaw dan ma HTML tagħna.

1117
00:55:54,470 --> 00:55:59,550
Allura PHP tagħna se tagħtina l-poter li
tbiddel HTML kontenut tal-paġna qabel ma

1118
00:55:59,550 --> 00:56:00,000
tagħbija tagħha.

1119
00:56:00,000 --> 00:56:04,270
Allura ibbażati fuq kondizzjonijiet differenti,
normalment l-utent speċifiku li l-

1120
00:56:04,270 --> 00:56:07,520
illoggjat, nistgħu juru
informazzjoni differenti.

1121
00:56:07,520 --> 00:56:08,800
Linda, ma għandek xi mistoqsija?

1122
00:56:08,800 --> 00:56:15,510
>> UDJENZA: Tista concatenate
integer wkoll?

1123
00:56:15,510 --> 00:56:16,760
>> ZAMYLA Chan: Iva, inti tista '.

1124
00:56:16,760 --> 00:56:19,530

1125
00:56:19,530 --> 00:56:23,270
Għalhekk il-kwistjoni kienet jekk tista '
concatenate interi jew ieħor

1126
00:56:23,270 --> 00:56:28,920
variable.s issa, nimxu fuq MVC, li
hija paradigma li aħna użati fl

1127
00:56:28,920 --> 00:56:33,380
pset7 u ħafna ta 'web disinjaturi jużaw għal
torganizza l-kodiċi fil-fajls

1128
00:56:33,380 --> 00:56:34,490
fil-website tagħhom.

1129
00:56:34,490 --> 00:56:35,870
M stands għall-Mudell.

1130
00:56:35,870 --> 00:56:41,450
U bażikament, fajls mudell se tittratta
ma 'interazzjonijiet ma' l-database.

1131
00:56:41,450 --> 00:56:44,640
View fajls, dawn jirrelataw mal-
estetika tal-websajt.

1132
00:56:44,640 --> 00:56:47,550
U l-kontrollur manki
talbiet utent, parses

1133
00:56:47,550 --> 00:56:49,230
data, ma loġika oħra.

1134
00:56:49,230 --> 00:56:52,520
>> Fl pset7, aħna flimkien il-mudell
u l-kontrollur.

1135
00:56:52,520 --> 00:56:55,880
U aħna biss imsejħa minnhom kontrolluri u
tpoġġihom fil-direttorju pubbliku.

1136
00:56:55,880 --> 00:57:01,730
U l-fajls ħsieb, aħna jużawhom bħala
templates fil-direttorju templates.

1137
00:57:01,730 --> 00:57:07,260
Allura dan dijagramma hawn jirrappreżenta wkoll
l-istess tip ta 'diviżjoni bil-

1138
00:57:07,260 --> 00:57:10,510
mudell u l-kontrollur fil-vjola
hawn fuq ix-xellug u

1139
00:57:10,510 --> 00:57:12,770
l-opinjoni fuq il-lemin.

1140
00:57:12,770 --> 00:57:16,020
Allura dan huwa skematika li xi wħud minnkom
tista raw fil Ħinijiet Uffiċċju jew

1141
00:57:16,020 --> 00:57:19,130
dijagrammi li konna tpinġija kif inti
kienu jidhru pset tiegħek.

1142
00:57:19,130 --> 00:57:25,030
>> Allura hawn, fi kontrollur partikolari, mudell
kontrollur, għandna funzjonijiet

1143
00:57:25,030 --> 00:57:30,490
li għandhom x'jaqsmu mal juri dubji fuq l-SQL
database, eżekuzzjoni loġika PHP.

1144
00:57:30,490 --> 00:57:32,370
Forsi inti tfittex up
stokk fil Yahoo!

1145
00:57:32,370 --> 00:57:34,590
Finanzi.

1146
00:57:34,590 --> 00:57:37,390
Jew forsi, inti biss jiċċekkjaw li
tara jekk utent kienet ippreżentat

1147
00:57:37,390 --> 00:57:40,250
jiffurmaw diġà qabel ma
żar il-paġna tiegħek.

1148
00:57:40,250 --> 00:57:43,390
U allura inti jirrendi
Formola hawn fuq.

1149
00:57:43,390 --> 00:57:48,210
Wara kien ġie sottomess li l-formola
mill-utent, l-azzjoni li kienet

1150
00:57:48,210 --> 00:57:53,470
speċifikat fl tag HTML-forma ta
jindika l-paġna li

1151
00:57:53,470 --> 00:57:55,620
prospetti li d-data li.

1152
00:57:55,620 --> 00:57:59,460
>> Allura kollha ta 'dik l-informazzjoni tkun
jintbagħtu lura lill-kontrollur tiegħek.

1153
00:57:59,460 --> 00:58:02,620
Imbagħad inti probabilment tagħmel daqsxejn aktar
loġika fuq dak u forsi tesegwixxi ftit

1154
00:58:02,620 --> 00:58:06,510
mistoqsijiet aktar fid-database SQL u
allura, finalment, toħroġ bi nicely

1155
00:58:06,510 --> 00:58:11,930
sett ippakkjat ta 'informazzjoni li inti
jgħaddu fis xi template ieħor

1156
00:58:11,930 --> 00:58:13,950
li tintwera din l-informazzjoni.

1157
00:58:13,950 --> 00:58:17,030
Issa, kif nistgħu attwalment pakkett
li sa l-informazzjoni?

1158
00:58:17,030 --> 00:58:23,980
Well, aħna għandna funzjoni msejħa jirrendi
li kien fil-fajl functions.php fil

1159
00:58:23,980 --> 00:58:29,950
pset7, fejn inti tgħaddi fl-isem ta '
fajl, l-isem ta 'mudell.

1160
00:58:29,950 --> 00:58:32,160
>> U allura inti wkoll jgħaddu
firxa assoċjattiva.

1161
00:58:32,160 --> 00:58:37,150
U hekk li firxa assoċjattiva jirrappreżenta
l-informazzjoni differenti

1162
00:58:37,150 --> 00:58:39,040
li inti tixtieq li tgħaddi pulzieri

1163
00:58:39,040 --> 00:58:43,460
Issa, dak li għaddej biex tkun kostanti fil-
dawn l-eżempji huwa li l-mezzi jew,

1164
00:58:43,460 --> 00:58:47,070
pjuttost,-ċwievet tal-assoċjattiv
arrays, dawn huma dak li għaddej biex tkun

1165
00:58:47,070 --> 00:58:51,050
mistenni li jkun kostanti mill-mudell,
għaliex taf li jeħtieġ

1166
00:58:51,050 --> 00:58:53,990
xi ħaġa imsejħa messaġġ
jew imsejħa isem.

1167
00:58:53,990 --> 00:58:56,940
U allura l-affarijiet fuq il-lemin, il-
valuri reali, hekk f'dan il-każ, li l-

1168
00:58:56,940 --> 00:59:00,750
tifel tajjeb u Milo, dawk huma għaddejjin
li huma l-valuri li qed jinbidlu

1169
00:59:00,750 --> 00:59:05,610
li l-kontrollur bidliet kull darba
jew ibbażati fuq ċerta kondizzjoni u

1170
00:59:05,610 --> 00:59:07,120
se tgħaddi dik pulzieri

1171
00:59:07,120 --> 00:59:12,790
>> Allura hawn fil templates, naraw li aħna
qed tuża karattri speċjali HTML,

1172
00:59:12,790 --> 00:59:16,370
li biss bażikament ifisser li rridu
biex jiksbu l-string peer li l-

1173
00:59:16,370 --> 00:59:17,580
utent tpoġġi pulzieri

1174
00:59:17,580 --> 00:59:20,880
U rridu li tissostitwixxi
messaġġ fil hemmhekk.

1175
00:59:20,880 --> 00:59:26,110
Mela allura meta aħna attwalment ħsieb
il-fajl, il-speċifiku

1176
00:59:26,110 --> 00:59:28,700
informazzjoni mgħoddija pulzieri

1177
00:59:28,700 --> 00:59:33,850
Innota li ċ-ċavetta kemm jirrendi xogħlijiet hija
li l-mezzi tal-assoċjattiv

1178
00:59:33,850 --> 00:59:37,170
arrays, dawk jsiru varjabbli
ismijiet hawn.

1179
00:59:37,170 --> 00:59:40,720
U għalhekk il-valuri ta 'dik ewlieni fl-
firxa assoċjattiva mbagħad isir l-

1180
00:59:40,720 --> 00:59:41,970
valur tal-varjabbli.

1181
00:59:41,970 --> 00:59:44,800

1182
00:59:44,800 --> 00:59:46,040
>> Issa, tikri jimxu fuq SQL.

1183
00:59:46,040 --> 00:59:48,010
Stands għall Strutturat
Mistoqsija Lingwa.

1184
00:59:48,010 --> 00:59:50,460
U għalhekk din hija biss programmazzjoni
lingwa mfassla

1185
00:59:50,460 --> 00:59:51,880
għall-ġestjoni databases.

1186
00:59:51,880 --> 00:59:56,860
U wasal fil handy għalina fil-
websajt tagħna finanzi pset7.

1187
00:59:56,860 --> 01:00:00,510
Essenzjalment, huwa biss mod faċli biex
track u jimmaniġġjaw oġġetti u tabelli

1188
01:00:00,510 --> 01:00:02,070
u jorbtuhom ma xulxin.

1189
01:00:02,070 --> 01:00:06,860
Issa, think ta 'database SQL tiegħek
bażikament bħala fajl Excel, forsi,

1190
01:00:06,860 --> 01:00:10,040
folji tabbed multipli.

1191
01:00:10,040 --> 01:00:13,820
>> Allura inti jista 'jkollhom tabelli multipli,
forsi, li marbuta ma xulxin.

1192
01:00:13,820 --> 01:00:19,420
U ħafna bħal Excel, aħna għandna ħafna ta '
l-funzjonalità li rridu.

1193
01:00:19,420 --> 01:00:22,300
Per eżempju, nistgħu tagħżel
ċerti ringieli.

1194
01:00:22,300 --> 01:00:24,110
Nistgħu daħħal informazzjoni.

1195
01:00:24,110 --> 01:00:25,560
Nistgħu taġġorna ringieli.

1196
01:00:25,560 --> 01:00:27,440
U nistgħu wkoll iħassar affarijiet.

1197
01:00:27,440 --> 01:00:30,920

1198
01:00:30,920 --> 01:00:36,560
>> Il SQL tagħżel xogħlijiet billi tagħżel ringieli
jew filliera ta 'kolonni speċifikati minn

1199
01:00:36,560 --> 01:00:39,640
database li jaqblu ċertu
kriterji li inti jindikaw.

1200
01:00:39,640 --> 01:00:44,930
Allura minn hawn meta nara * agħżel mill-
wizards fejn house = Ravenclaw, allura

1201
01:00:44,930 --> 01:00:48,340
Jien għażla *, li jfisser jien
tagħżel kull kolonna waħda f'dak

1202
01:00:48,340 --> 01:00:56,340
ringiela mit-tabella wizards iżda biss jekk
il-kolonna house ugwali Ravenclaw.

1203
01:00:56,340 --> 01:00:57,840
Issa, dan huwa pur jew SQL.

1204
01:00:57,840 --> 01:01:02,680
Hekk jekk I marru fis phpmyadmin, li hija
il-mod speċifiku li nużaw biex jamministraw

1205
01:01:02,680 --> 01:01:07,040
databases SQL tagħna, imbagħad I tista 'daħħal
li fil-website phpMyAdmin.

1206
01:01:07,040 --> 01:01:08,290
U li tesegwixxi.

1207
01:01:08,290 --> 01:01:11,280
>> Iżda aħna fil-fatt tixtieq li tagħmel
li fuq in-naħa PHP.

1208
01:01:11,280 --> 01:01:12,580
Allura kif nistgħu nagħmlu?

1209
01:01:12,580 --> 01:01:20,180
Well, aħna nużaw l-funzjoni query, li
bażikament tesegwixxi dik mistoqsija SQL.

1210
01:01:20,180 --> 01:01:21,830
Bl-użu?

1211
01:01:21,830 --> 01:01:25,850
bħala placeholder, nistgħu jgħaddu f'ċerti
valuri għal string tagħna li aħna

1212
01:01:25,850 --> 01:01:26,920
tixtieq li tieħu post.

1213
01:01:26,920 --> 01:01:32,110
Hekk forsi jien ħażna differenti
valuri fil-curr_house, li

1214
01:01:32,110 --> 01:01:34,400
jirrappreżenta l-dar attwali
li jien għaddejjin.

1215
01:01:34,400 --> 01:01:39,040
So I jistgħu jgħaddu li bħala placeholder
bil-marka kwistjoni.

1216
01:01:39,040 --> 01:01:43,290
U mbagħad I ser bażikament tesegwixxi l-
istess ħaġa kif għamilt qabel, ħlief

1217
01:01:43,290 --> 01:01:45,550
issa, jien fil-PHP.

1218
01:01:45,550 --> 01:01:51,300
>> U mistoqsija se jirritorna
firxa assoċjattiva.

1219
01:01:51,300 --> 01:01:53,470
U jien ser jaħżen fil-ringieli.

1220
01:01:53,470 --> 01:01:56,880
Issa, mistoqsija tista 'dejjem jonqsu.

1221
01:01:56,880 --> 01:02:02,870
Forsi l-mistoqsija SQL ma setgħetx teżegwixxi
minħabba li l-tabella ma kinux jeżistu.

1222
01:02:02,870 --> 01:02:04,310
Jew forsi, il-kolonna ma kinux jeżistu.

1223
01:02:04,310 --> 01:02:05,400
Xi ħaġa li marret ħażin.

1224
01:02:05,400 --> 01:02:08,170
Ukoll, fil-każ, inti taf tixtieq tagħmel
żgur li inti tiċċekkja jekk l-

1225
01:02:08,170 --> 01:02:09,700
query lura falza.

1226
01:02:09,700 --> 01:02:15,590
U li bl-użu tal-triple
ugwali joperaw fihom.

1227
01:02:15,590 --> 01:02:19,660
>> U mbagħad I ruhna, li hija ieħor
Funzjoni CS50, li jgħaddi fil-messaġġ.

1228
01:02:19,660 --> 01:02:23,435
U jekk inti tħares lejn ruhna, dan kollu
verament ma huwa jirrendi apology.php.

1229
01:02:23,435 --> 01:02:26,100

1230
01:02:26,100 --> 01:02:26,410
Yeah.

1231
01:02:26,410 --> 01:02:29,630
>> UDJENZA: Tista 'tispjega dak li
star ma bejn jagħżel u minn?

1232
01:02:29,630 --> 01:02:30,710
>> ZAMYLA Chan: Yeah, assolutament.

1233
01:02:30,710 --> 01:02:35,220
Allura l-istilla fl bejn jagħżel u minn
ifisser li nixtieq li jagħżlu l-sħiħ

1234
01:02:35,220 --> 01:02:37,440
ringiela kollha mit-tabella tiegħi.

1235
01:02:37,440 --> 01:02:41,900
I jistgħu stajt indikat tagħżel
isem, is-sena, house.

1236
01:02:41,900 --> 01:02:46,160
U nixtieq nikseb dawk biss tlieta
kolonni mejda tiegħi.

1237
01:02:46,160 --> 01:02:51,560
Imma jekk ngħid * agħżel, imbagħad I ser
tikseb kollox f'dik il-kolonna.

1238
01:02:51,560 --> 01:02:53,760
Imbagħad jien se jmorru lilek
fid-dahar ewwel.

1239
01:02:53,760 --> 01:02:57,656
>> UDJENZA: Allura dan għadu
fil SQL, right?

1240
01:02:57,656 --> 01:02:59,610
Hija din il-mistoqsija jew din hija PHP?

1241
01:02:59,610 --> 01:03:00,550
>> ZAMYLA Chan: Aħna fil-mistoqsija.

1242
01:03:00,550 --> 01:03:01,940
Allura dan huwa fil-PHP.

1243
01:03:01,940 --> 01:03:06,280
Hekk billi tuża l-mistoqsija funzjoni PHP,
aħna qed eżekuzzjoni mistoqsija SQL.

1244
01:03:06,280 --> 01:03:11,988

1245
01:03:11,988 --> 01:03:15,364
>> UDJENZA: Huwa xejn SQL
każ sensittivi, bħall tagħżel

1246
01:03:15,364 --> 01:03:17,834
jew wizards jew dar?

1247
01:03:17,834 --> 01:03:20,050
>> ZAMYLA Chan: Huwa xejn
fil SQL każ sensittivi?

1248
01:03:20,050 --> 01:03:21,760
Nemmen hekk, iva.

1249
01:03:21,760 --> 01:03:24,620
Nemmen li SELECT u minn
U fejn huma każ sensittivi.

1250
01:03:24,620 --> 01:03:25,535
Nru?

1251
01:03:25,535 --> 01:03:27,500
>> ROB BOWDEN: Għalhekk, huwa l-oppost.

1252
01:03:27,500 --> 01:03:32,030
L-ismijiet kolonna u l-mezzi tal-mejda,
dawk kollha huma każ sensittivi.

1253
01:03:32,030 --> 01:03:35,470
Iżda kwalunkwe mill-kliem ewlenin MySQL, bħal
TAGĦŻEL, MINN, u fejn, dawn mhumiex

1254
01:03:35,470 --> 01:03:36,140
sensittivi każ.

1255
01:03:36,140 --> 01:03:36,420
OK.

1256
01:03:36,420 --> 01:03:37,780
Allura l-oppost ta 'dak li għidt.

1257
01:03:37,780 --> 01:03:40,420
Sabiex kollha tal-kliem kjavi MySQL -

1258
01:03:40,420 --> 01:03:42,670
jagħżlu, minn, fejn - dawk
mhumiex każ sensittivi.

1259
01:03:42,670 --> 01:03:44,630
Imma kollox huwa.

1260
01:03:44,630 --> 01:03:45,210
OK.

1261
01:03:45,210 --> 01:03:46,500
Inti fil-front.

1262
01:03:46,500 --> 01:03:52,041
>> UDJENZA: Jekk ikolli $ ringieli f'termini ta '
aktar minn filliera waħda, ma jfissirx li hija

1263
01:03:52,041 --> 01:03:53,640
biss isir firxa assoċjattiva?

1264
01:03:53,640 --> 01:03:59,550
>> ZAMYLA Chan: Għalhekk il-kwistjoni kienet jekk ringieli
għandha aktar minn filliera waħda fiha, ma

1265
01:03:59,550 --> 01:04:01,800
din issir firxa assoċjattiva?

1266
01:04:01,800 --> 01:04:05,680
Għalhekk huwa firxa ta 'assoċjattiva
arrays diġà.

1267
01:04:05,680 --> 01:04:10,730
Għalhekk anki jekk hemm filliera waħda biss
lura, allura inti d jkollhom biex tmur

1268
01:04:10,730 --> 01:04:12,690
indiċi 0 ta 'dak ir-riżultat.

1269
01:04:12,690 --> 01:04:15,316
U allura inti d jkollhom li l-ewwel ringiela.

1270
01:04:15,316 --> 01:04:17,482
Iva, Belinda?

1271
01:04:17,482 --> 01:04:21,258
>> UDJENZA: Meta tuża ===,
dan huwa l-każ biss?

1272
01:04:21,258 --> 01:04:22,210
Jew hemm oħrajn?

1273
01:04:22,210 --> 01:04:26,815
>> ZAMYLA Chan: Allura f'dan il-każ, ===
huwa paragun matul tipi.

1274
01:04:26,815 --> 01:04:29,870

1275
01:04:29,870 --> 01:04:34,050
Jiddispjacini. === Huwa paragun
li tqabbel it-tipi.

1276
01:04:34,050 --> 01:04:37,620
U mbagħad == tqabbel fit-tipi kollha.

1277
01:04:37,620 --> 01:04:41,620
>> UDJENZA: Tista 'tispjega liema
ringieli huwa f'din is-sitwazzjoni?

1278
01:04:41,620 --> 01:04:45,120
Huwa ringiela ta 'data?

1279
01:04:45,120 --> 01:04:48,100
>> ZAMYLA Chan: Fil-slide li jmiss, jien
ser jispjegaw dak ringieli hu.

1280
01:04:48,100 --> 01:04:49,890
Mela jekk inti ma mind azjenda
off fuq dan.

1281
01:04:49,890 --> 01:04:50,620
U allura inti fid-dahar?

1282
01:04:50,620 --> 01:04:54,699
>> UDJENZA: Għal funzjonijiet simili mistoqsija,
tirrendi u ruhna [inaudible]?

1283
01:04:54,699 --> 01:04:59,050

1284
01:04:59,050 --> 01:05:03,050
>> ZAMYLA Chan: Il-mistoqsija kienet jekk
dawn il-funzjonijiet - mistoqsija, ruhna,

1285
01:05:03,050 --> 01:05:04,510
u jirrendi -

1286
01:05:04,510 --> 01:05:05,930
huma komuni madwar PHP.

1287
01:05:05,930 --> 01:05:09,460
Dawn huma dawk li CS50
kiteb għall pset7.

1288
01:05:09,460 --> 01:05:09,910
U Jay?

1289
01:05:09,910 --> 01:05:15,333
>> UDJENZA: Meta għandek bżonn li jgħidu
$ _session, Hija li huwa biss għall-IDs?

1290
01:05:15,333 --> 01:05:17,310
Jew inti tista qalu li hawn?

1291
01:05:17,310 --> 01:05:23,440
>> ZAMYLA Chan: Għalhekk il-kwistjoni kienet, meta
nużaw $ _session, li kien speċifiku

1292
01:05:23,440 --> 01:05:25,290
varjabbli globali inkunu qed tuża.

1293
01:05:25,290 --> 01:05:32,080
Hawnhekk din il-varjabbli se
jkun lokali funzjoni tagħna.

1294
01:05:32,080 --> 01:05:36,588
Allura aħna qed biss tiddikjara
varjabbli ġdid.

1295
01:05:36,588 --> 01:05:38,460
>> UDJENZA: Kif ruhna
implimentati?

1296
01:05:38,460 --> 01:05:40,960
>> ZAMYLA Chan: Il-kwistjoni kienet,
kif huwa ruhna implimentata?

1297
01:05:40,960 --> 01:05:44,180
U naħseb dan huwa attwalment pretty
prattika tajba għalik guys li jmorru fis

1298
01:05:44,180 --> 01:05:49,260
is-sezzjoni functions.php u tħares lejn
ruhna u ara kemm inti jista 'jkollhom

1299
01:05:49,260 --> 01:05:50,670
isir it yourself.

1300
01:05:50,670 --> 01:05:55,620
So I jistgħu jħallu dak li inti imma biss
jgħidu li jekk inti tħares lejn ruhna,

1301
01:05:55,620 --> 01:06:02,110
allura tieħu l-messaġġ li inti
sottomessa ruhna, u mbagħad

1302
01:06:02,110 --> 01:06:06,570
tirrendi dak il-messaġġ.

1303
01:06:06,570 --> 01:06:08,240
Kwalunkwe mistoqsijiet aktar?

1304
01:06:08,240 --> 01:06:08,710
I imħabba mistoqsijiet.

1305
01:06:08,710 --> 01:06:09,555
Allura jżommuhom ġejjin.

1306
01:06:09,555 --> 01:06:11,888
>> UDJENZA: [inaudible]

1307
01:06:11,888 --> 01:06:13,840
eku jew print hemmhekk?

1308
01:06:13,840 --> 01:06:15,900
>> ZAMYLA Chan: Il-kwistjoni kienet,
nistgħu mhux biss poġġew

1309
01:06:15,900 --> 01:06:17,000
eku jew print hemmhekk.

1310
01:06:17,000 --> 01:06:19,710
Allura li kien jagħmel xi ħaġa
kemmxejn differenti.

1311
01:06:19,710 --> 01:06:23,750
Li kieku stampati query
naqset fis li -

1312
01:06:23,750 --> 01:06:27,420
ukoll, id-dritt issa, aħna qed attwalment
kontrollur tagħna.

1313
01:06:27,420 --> 01:06:30,350
Allura aħna ma attwalment ikollhom
HTML stabbilit hawn.

1314
01:06:30,350 --> 01:06:34,946
Ruhna billi tirrendi apologize.php
attwalment redirects inti apology.php.

1315
01:06:34,946 --> 01:06:39,560

1316
01:06:39,560 --> 01:06:42,200
OK.

1317
01:06:42,200 --> 01:06:45,880
>> Allura issa, ejja mur fuq biex tindirizza l-
mistoqsija minn qabel dwar dak

1318
01:06:45,880 --> 01:06:47,330
hija verament ringieli.

1319
01:06:47,330 --> 01:06:51,960
Well, query se terġa 'lura
firxa ta 'ringieli.

1320
01:06:51,960 --> 01:06:55,020
U kull ringiela huwa rappreżentat
minn firxa assoċjattiva.

1321
01:06:55,020 --> 01:07:02,840
Mela jekk stajt esegwiti xi mistoqsija SQL u
Stajt maħżuna ir-riżultat fir-ringieli, allura

1322
01:07:02,840 --> 01:07:07,850
tuża loop foreach, allura l-array
isem hija l-ewwel waħda hemm - ringieli.

1323
01:07:07,850 --> 01:07:13,170
U allura jien ser sejħa
kull ringiela fil hemm $ ringiela.

1324
01:07:13,170 --> 01:07:20,060
>> Allura mtennija matul dak, I jistgħu mbagħad
aċċess kolonna isem il-filliera mogħti, il-

1325
01:07:20,060 --> 01:07:22,340
kolonna sena, u l-kolonna house.

1326
01:07:22,340 --> 01:07:28,010
Innota li I ma kienx ikun kapaċi
tagħmel dan ma ringieli, minħabba indiċi ringieli

1327
01:07:28,010 --> 01:07:29,290
isem ma jeżistix.

1328
01:07:29,290 --> 01:07:31,970
Ringieli huwa biss firxa ta '
arrays assoċjattiva.

1329
01:07:31,970 --> 01:07:34,870
Allura għandek żewġ livelli hemmhekk.

1330
01:07:34,870 --> 01:07:37,170
Ladarba inti għandek l-firxa ta 'ringieli,
għandek tikseb fis dan.

1331
01:07:37,170 --> 01:07:39,110
U allura inti tista 'aċċess l-kolonni.

1332
01:07:39,110 --> 01:07:41,636
Did li jagħmluha ċara?

1333
01:07:41,636 --> 01:07:42,520
Yeah, quddiem?

1334
01:07:42,520 --> 01:07:45,490
>> UDJENZA: [inaudible] tiftaħ
parentesi għal [inaudible]?

1335
01:07:45,490 --> 01:07:46,220
>> ZAMYLA Chan: Maħfra me?

1336
01:07:46,220 --> 01:07:49,740
>> UDJENZA: Il-parentesi miftuħa.

1337
01:07:49,740 --> 01:07:52,420
>> ZAMYLA Chan: Dawn hawn?

1338
01:07:52,420 --> 01:07:58,520
Li tippermetti lili biex jinkludu
dak il-varjabbli.

1339
01:07:58,520 --> 01:07:58,670
Yeah.

1340
01:07:58,670 --> 01:08:01,900
>> UDJENZA: Meta inti print, int
istampar għall-HTML code?

1341
01:08:01,900 --> 01:08:03,110
>> ZAMYLA Chan: Iva.

1342
01:08:03,110 --> 01:08:07,720
Meta I jistampa, dan hawnhekk huwa ġewwa
template tiegħi issa, sabiex

1343
01:08:07,720 --> 01:08:10,310
fehma tiegħi ta 'metodu MVC.

1344
01:08:10,310 --> 01:08:12,750
Hekk jien istampar fil-HTML.

1345
01:08:12,750 --> 01:08:16,670
>> UDJENZA: Allura jekk aħna marru fis-iżviluppatur
għodod wara running dan, nistgħu

1346
01:08:16,670 --> 01:08:17,160
li attwalment fil-kodiċi?

1347
01:08:17,160 --> 01:08:18,410
>> ZAMYLA Chan: Li l-kbir
kwistjoni, yeah.

1348
01:08:18,410 --> 01:08:22,359
Mela jekk inti marru fis-għodod iżviluppatur
fl Firefox użu Firebug jew

1349
01:08:22,359 --> 01:08:26,109
Chrome, allura yeah, inti tista '
tara l-HTML speċifiku.

1350
01:08:26,109 --> 01:08:28,470
Għalhekk ma juru $ ringiela ["Isem"].

1351
01:08:28,470 --> 01:08:32,524
Ikun juri liema
isem huwa f'dak il-filliera.

1352
01:08:32,524 --> 01:08:36,268
>> UDJENZA: Just kwistjoni ġenerali,
liema huma tr u td definit bħala?

1353
01:08:36,268 --> 01:08:37,672
Għaliex kieku aħna [inaudible]?

1354
01:08:37,672 --> 01:08:41,850

1355
01:08:41,850 --> 01:08:44,814
>> ZAMYLA Chan: Tabella tr ringiela,
tabella imbagħad td kolonna.

1356
01:08:44,814 --> 01:08:48,060

1357
01:08:48,060 --> 01:08:49,310
OK.

1358
01:08:49,310 --> 01:08:55,771

1359
01:08:55,771 --> 01:08:56,835
>> UDJENZA: Yeah, huwa data mejda.

1360
01:08:56,835 --> 01:08:58,770
>> ZAMYLA Chan: data Tabella.

1361
01:08:58,770 --> 01:08:59,894
Yeah.

1362
01:08:59,894 --> 01:09:08,670
>> UDJENZA: Huwa ringiela li fiha l-
ringiela jitqies bħal kolonna?

1363
01:09:08,670 --> 01:09:08,910
>> ZAMYLA Chan: Jiddispjacini.

1364
01:09:08,910 --> 01:09:10,570
Inti tista 'tirrepeti li?

1365
01:09:10,570 --> 01:09:14,450
>> UDJENZA: Kif
Ħares ringieli?

1366
01:09:14,450 --> 01:09:16,310
>> ZAMYLA Chan: Kif inti Ħares
ringieli fil liema tip ta 'mod?

1367
01:09:16,310 --> 01:09:21,796
Huma inti titkellem dwar dawn
ringieli hawn jew il-fillieri tr?

1368
01:09:21,796 --> 01:09:22,630
>> UDJENZA: Ir-ringieli.

1369
01:09:22,630 --> 01:09:25,229
>> ZAMYLA Chan: Dawn ringieli hawn?

1370
01:09:25,229 --> 01:09:28,620
I d Ħares dan bħala
I tesegwixxi mistoqsija tiegħi.

1371
01:09:28,620 --> 01:09:38,729
U jgħid, OK, I jkollhom jew 0 sa n
ammont ta 'ringieli li jaqblu mal-kriterji

1372
01:09:38,729 --> 01:09:40,510
li inti kienu staqsew.

1373
01:09:40,510 --> 01:09:43,740
So I għandhom xi numru ta 'ringieli.

1374
01:09:43,740 --> 01:09:51,450
Allura ringieli, ir-ringieli $, ħwienet kull
wieħed minn dawk ringieli fil-firxa.

1375
01:09:51,450 --> 01:09:58,110
Għalhekk anki jekk huwa biss wieħed minnhom, huwa
xorta firxa ta 'ringieli li jaqblu magħha.

1376
01:09:58,110 --> 01:10:03,010
>> Mela allura, per eżempju, dan huwa
simili għal meta inti fetched

1377
01:10:03,010 --> 01:10:05,390
l-cache mill-utenti.

1378
01:10:05,390 --> 01:10:10,810
U l-kriterji kienx hemm fejn
ID huwa daqs il sessjoni ID.

1379
01:10:10,810 --> 01:10:14,250
Hemm verament biss ringiela waħda
li jista 'jaqbel ma' dak.

1380
01:10:14,250 --> 01:10:18,960
Iżda xorta ringieli biss lura ringiela waħda.

1381
01:10:18,960 --> 01:10:22,620
Allura inti d jkollhom biex tmur ringieli,
indiċi 0, cache indiċi li

1382
01:10:22,620 --> 01:10:26,195
tikseb effettivament cache tiegħek.

1383
01:10:26,195 --> 01:10:29,650
>> UDJENZA: Huwa l-funzjoni tal-istampar
fl eku l-istess ħaġa?

1384
01:10:29,650 --> 01:10:30,670
>> ZAMYLA Chan: Iva.

1385
01:10:30,670 --> 01:10:31,190
Iva.

1386
01:10:31,190 --> 01:10:33,304
Stampa eku tal-istess.

1387
01:10:33,304 --> 01:10:42,400
>> UDJENZA: Huwa l-loop foreach l-
uniku mod biex indiċi fis ringieli?

1388
01:10:42,400 --> 01:10:46,110
>> ZAMYLA Chan: Huwa loop foreach
l-uniku mod li inti tista '

1389
01:10:46,110 --> 01:10:47,030
jtenni permezz ringieli?

1390
01:10:47,030 --> 01:10:47,180
Nru.

1391
01:10:47,180 --> 01:10:51,000
Tista 'wkoll tuża għal loop, sakemm
li taf it-tul

1392
01:10:51,000 --> 01:10:53,024
tal-firxa tal-filliera ta.

1393
01:10:53,024 --> 01:10:58,500
>> UDJENZA: Inti tista 'jkollhom aċċess għaliha
użu ta 'ringiela kif [inaudible]?

1394
01:10:58,500 --> 01:11:01,640
>> ZAMYLA Chan: Allura inti ma tista 'aċċess
biss jużaw ringiela jekk inti ma jkollhom

1395
01:11:01,640 --> 01:11:05,160
loop foreach sakemm
int ma ddikjarat filliera.

1396
01:11:05,160 --> 01:11:08,150

1397
01:11:08,150 --> 01:11:09,660
Iva.

1398
01:11:09,660 --> 01:11:10,810
Yeah, fil-abjad.

1399
01:11:10,810 --> 01:11:13,990
>> UDJENZA: Mela xi do tr u td tagħmel?

1400
01:11:13,990 --> 01:11:16,790
>> ZAMYLA Chan: So tr u
td huma tags HTML.

1401
01:11:16,790 --> 01:11:19,590
tr tindika l-bidu
ta 'ringiela tabella.

1402
01:11:19,590 --> 01:11:26,625
U kull td jindika
kolonna ġdida data tabella.

1403
01:11:26,625 --> 01:11:32,275
>> UDJENZA: Għal viżwali ta 'dak ringiela
huwa simili, biss jimmaġina l-SQL, kif

1404
01:11:32,275 --> 01:11:33,510
dawn ikollhom filliera.

1405
01:11:33,510 --> 01:11:35,980
[Inaudible].

1406
01:11:35,980 --> 01:11:36,390
>> ZAMYLA Chan: Yeah.

1407
01:11:36,390 --> 01:11:37,630
Li l-punt kbir.

1408
01:11:37,630 --> 01:11:41,510
Tista Ħares ringieli bħala biss
bħal fil tabella Excel, just

1409
01:11:41,510 --> 01:11:44,540
il-lista tal-ringieli.

1410
01:11:44,540 --> 01:11:46,870
OK.

1411
01:11:46,870 --> 01:11:47,230
Kull dritt.

1412
01:11:47,230 --> 01:11:50,740
Allura issa li aħna ħadthom marret matul tagħżel, jekk
ma jkunx hemm xi mistoqsijiet aktar, aħna ser

1413
01:11:50,740 --> 01:11:52,970
jmorru fuq fuq daħħal.

1414
01:11:52,970 --> 01:11:58,220
Mela jekk jien ridt li daħħal fis xi
mejda u daħħal ċerti kolonna

1415
01:11:58,220 --> 01:12:02,320
valuri, I tista 'daħħal myself
fis Ravenclaw fis-sena 7.

1416
01:12:02,320 --> 01:12:07,245
Imma xi kultant jista 'jkun hemm duplikat
valuri, kif rajna fil pset7 meta aħna

1417
01:12:07,245 --> 01:12:09,240
kienu aġġornament portafoll tagħna.

1418
01:12:09,240 --> 01:12:15,610
>> Allura f'dan il-każ, irridu li jużaw ON
DUPLIKAT KEY AĠĠORNAMENT, hekk li aħna ma

1419
01:12:15,610 --> 01:12:18,280
taħżen ringieli multipli bl-istess
valur iżda pjuttost taġġornah.

1420
01:12:18,280 --> 01:12:21,780

1421
01:12:21,780 --> 01:12:25,560
Imbagħad għandna attwalment ikollhom aġġornament,
li mhijiex daħħal.

1422
01:12:25,560 --> 01:12:30,100
Huwa biss aġġornament fejn inti aġġornament
f'ċertu mejda partikolari

1423
01:12:30,100 --> 01:12:34,403
kriterji u mbagħad, fl-aħħarnett, iħassru,
li ma ħaġa simili ħafna.

1424
01:12:34,403 --> 01:12:40,200
>> UDJENZA: Tista qosor
jmorru fuq il-ċavetta duplikat?

1425
01:12:40,200 --> 01:12:40,850
>> ZAMYLA Chan: Yeah.

1426
01:12:40,850 --> 01:12:48,340
Essenzjalment hawn, għandi DAĦĦAL FIS
gringotts, huwa, galleons, dawn il-valuri.

1427
01:12:48,340 --> 01:12:56,900
Iżda ID, preżumibbilment, huwa ċavetta unika
valur stabbilit fit-tabella MySQL.

1428
01:12:56,900 --> 01:13:06,750
Mela jekk jien diġà li ID stabbilit,
allura ma nistax daħħal ringiela ġdida.

1429
01:13:06,750 --> 01:13:10,961
Hekk jekk dan ma jeżistix diġà,
imbagħad I jkollhom jaġġornaw dan.

1430
01:13:10,961 --> 01:13:16,040

1431
01:13:16,040 --> 01:13:17,722
Fin-nofs fil-abjad.

1432
01:13:17,722 --> 01:13:21,570
>> UDJENZA: Allura daħħal, aġġorna, ħassar,
u tagħżel, huma dawk kollha disponibbli

1433
01:13:21,570 --> 01:13:22,875
lokalment [inaudible]?

1434
01:13:22,875 --> 01:13:27,320

1435
01:13:27,320 --> 01:13:29,630
>> ZAMYLA Chan: So daħħal,
aġġornament, tħassar, u

1436
01:13:29,630 --> 01:13:31,120
jagħżlu huma kollha mistoqsijiet SQL.

1437
01:13:31,120 --> 01:13:34,970
Allura meta inti qed tuża SQL,
inti ser ikollok disponibbli.

1438
01:13:34,970 --> 01:13:38,226

1439
01:13:38,226 --> 01:13:40,706
>> UDJENZA: Lura għall-kwizzijiet passat -

1440
01:13:40,706 --> 01:13:44,178
kien hemm kwistjoni li ttrattata
jekk kellek mejda u riedu

1441
01:13:44,178 --> 01:13:52,610
daħħal riżultati tat-test wieħed u inti daħħal
isem tiegħek għalhekk mhux ser tavżak

1442
01:13:52,610 --> 01:13:54,594
[Inaudible] test score ħabib tiegħek.

1443
01:13:54,594 --> 01:13:59,060
Kif inti tagħmel dan ma daħħal?

1444
01:13:59,060 --> 01:14:02,490
>> ZAMYLA Chan: Għalhekk il-kwistjoni kienet dwar
mistoqsija preċedenti f'nofs it-terminu.

1445
01:14:02,490 --> 01:14:04,320
Jien ma jkunux konxji ta 'liema
wieħed huwa dritt issa.

1446
01:14:04,320 --> 01:14:06,790
Allura forsi wara, jekk inti tixtieq li
toħroġ u juru me, imbagħad I tista '

1447
01:14:06,790 --> 01:14:08,155
ċertament jagħtuk tips.

1448
01:14:08,155 --> 01:14:11,250

1449
01:14:11,250 --> 01:14:15,460
Iżda taħdit ta 'inseriment affarijiet, bħal
tieħu score xi ħadd meta inti

1450
01:14:15,460 --> 01:14:18,800
m'għandhomx, ejja nitkellmu dwar
SQL attakki injezzjoni.

1451
01:14:18,800 --> 01:14:22,050
Allura attakk injezzjoni SQL huwa essenzjalment
fejn xi ħadd jieħu

1452
01:14:22,050 --> 01:14:27,680
vantaġġ mill-sigurtà baxxa tal-
mod li inti qed tieħu fil-data.

1453
01:14:27,680 --> 01:14:35,660
>> Allura fil hawn, bħal fil-finanzi CS50,
meta aħna logged in, nistgħu jidħol fil-

1454
01:14:35,660 --> 01:14:39,510
username fil-forma login,
l-ewwel kaxxa ta 'test, u

1455
01:14:39,510 --> 01:14:41,570
mbagħad tidħol fil-password.

1456
01:14:41,570 --> 01:14:45,610
Forsi kodiċi PHP tagħna tista 'tidher
xi ħaġa bħal din, fejn $ username

1457
01:14:45,610 --> 01:14:51,410
huwa l-username post-data u password
huwa password post-data.

1458
01:14:51,410 --> 01:14:55,110
U allura aħna biss tesegwixxi mistoqsija tagħna, ngħidu aħna,
OK, ukoll, query tagħna se

1459
01:14:55,110 --> 01:14:57,990
tagħżel minn utenti tagħna, fejn
il-username huwa l-

1460
01:14:57,990 --> 01:14:58,970
wieħed li huma sottomessi.

1461
01:14:58,970 --> 01:15:06,870
U l-password huwa l-password,
jfisser li l-passwords jaqblu.

1462
01:15:06,870 --> 01:15:12,670
>> Issa, dak li jekk minflok attwalment
jissottomettu password attwali, bħall-

1463
01:15:12,670 --> 01:15:16,850
12345 u guessing fil prong li tgħid
password u jippruvaw Hack tagħhom

1464
01:15:16,850 --> 01:15:21,460
kont, dak li jekk minflok
huma ppreżentati dan.

1465
01:15:21,460 --> 01:15:24,380
Huma jistgħu tip fil forsi
raden bi password.

1466
01:15:24,380 --> 01:15:30,480
U allura dawn se finitura l-
kwotazzjoni imbagħad it-tip fil-jew 1 = 1.

1467
01:15:30,480 --> 01:15:35,160
Dan ikun pass direttament fil-SQL
mistoqsija tfittex xi ħaġa bħal din.

1468
01:15:35,160 --> 01:15:38,200
Agħżel minn utenti fejn username
= prongs u password

1469
01:15:38,200 --> 01:15:41,450
huwa ugwali lily jew 1 = 1.

1470
01:15:41,450 --> 01:15:45,450
>> Dan jew il-password għandha
li tkun korretta jew 1 = 1,

1471
01:15:45,450 --> 01:15:47,870
li huwa dejjem veru.

1472
01:15:47,870 --> 01:15:52,780
Allura f'dan il-każ, bażikament, l-utent jista '
jieħdu vantaġġ ta 'dan u biss log

1473
01:15:52,780 --> 01:15:55,240
ruħhom u Hack
kont ta 'xi ħadd.

1474
01:15:55,240 --> 01:15:58,950
Allura huwa għalhekk li għandna jixtiequ jevitaw
xi ħadd li jiġri dan.

1475
01:15:58,950 --> 01:16:03,890
Iżda fortunatament, il-funzjoni query minn
tgħaddi fil-placeholders se tieħu

1476
01:16:03,890 --> 01:16:04,800
ħsieb ta 'dan għalik.

1477
01:16:04,800 --> 01:16:08,570
Ukoll, inti ser tipikament qatt ma trid
bżonn jippreżenta l-passwords

1478
01:16:08,570 --> 01:16:09,310
infushom.

1479
01:16:09,310 --> 01:16:14,115
C'est pourquoi aħna hashed jew encrypted
minnhom fil-finanzi CS50.

1480
01:16:14,115 --> 01:16:17,553
>> UDJENZA: Il-kwiżż passat tkellmu
dwar MySQL kordi salvataġġ.

1481
01:16:17,553 --> 01:16:21,800
Do we jkollhom għalfejn tinkwieta dwar dan?

1482
01:16:21,800 --> 01:16:22,670
>> ZAMYLA Chan: Dik hija mistoqsija tajba.

1483
01:16:22,670 --> 01:16:29,050
Il-kordi jaħarbu MySQL huwa definittivament
funzjoni li kien użat fil-mistoqsija tagħna.

1484
01:16:29,050 --> 01:16:30,420
Iżda definittivament tħares lejn dan.

1485
01:16:30,420 --> 01:16:32,950
Id jgħidu li l-kaċċa ġust li tkun taf
li youd bżonn iċċempel li

1486
01:16:32,950 --> 01:16:34,370
jiffunzjonaw fuq string.

1487
01:16:34,370 --> 01:16:35,245
Yeah, Belinda?

1488
01:16:35,245 --> 01:16:38,606
>> UDJENZA: Kif tkun taf meta huwa
kwotazzjonijiet uniku jew kwotazzjonijiet doppja?

1489
01:16:38,606 --> 01:16:43,516
U wkoll, inħoss bħal fil-lecture inti
xi ħaġa dwar li ma jissemmiex

1490
01:16:43,516 --> 01:16:48,426
il-[inaudible] jew xi ħaġa jew il-
tieni kwotazzjoni waħda fl-aħħar.

1491
01:16:48,426 --> 01:16:56,407

1492
01:16:56,407 --> 01:17:00,825
Naħseb li huwa mfakkar fil-lecture li
int suppost li jkollhom apostrophe 1

1493
01:17:00,825 --> 01:17:04,290
u mbagħad ma jkollhom apostrophes
jew xi ħaġa.

1494
01:17:04,290 --> 01:17:05,540
>> UDJENZA: [inaudible].

1495
01:17:05,540 --> 01:17:14,860

1496
01:17:14,860 --> 01:17:18,657
>> UDJENZA: Il-ħaġa hija l-aħħar wieħed
kwotazzjoni fil hemm f'dan it-tieni kaxxa

1497
01:17:18,657 --> 01:17:19,391
m'għandux ikun hemm.

1498
01:17:19,391 --> 01:17:21,840
[Inaudible]

1499
01:17:21,840 --> 01:17:26,730
Għaliex meta inti tieħu din l-aħħar waħda
nikkwota out u jaqblu dawn għall-kontenut

1500
01:17:26,730 --> 01:17:30,522
meta l-password huwa, jekk ikollok li
query, hemm kwotazzjoni uniku

1501
01:17:30,522 --> 01:17:31,340
l-aħħar diġà.

1502
01:17:31,340 --> 01:17:36,580
Inti tixtieq li tuża dik kwotazzjoni waħda
bħala waħda li qed tiffaċċja l-waħda

1503
01:17:36,580 --> 01:17:37,574
[Inaudible].

1504
01:17:37,574 --> 01:17:42,820
Allura x'hemm attwalment f'dak test
kaxxa m'għandux ikollhom dik.

1505
01:17:42,820 --> 01:17:44,070
>> ZAMYLA Chan: jien ser bidla li.

1506
01:17:44,070 --> 01:17:56,490

1507
01:17:56,490 --> 01:17:56,880
OK.

1508
01:17:56,880 --> 01:18:00,435
Jekk ma jkunx hemm xi mistoqsijiet, imbagħad I ser
tgħaddiha lill Joseph biex jitkellmu

1509
01:18:00,435 --> 01:18:04,332
dwar JavaScript, eċċetera.

1510
01:18:04,332 --> 01:18:09,540
>> [Applause]

1511
01:18:09,540 --> 01:18:11,660
>> JOSEPH ONG: Allura qed norganizzaw
ftit wara.

1512
01:18:11,660 --> 01:18:13,280
Mela jekk għandek tħalli, li OK.

1513
01:18:13,280 --> 01:18:16,540
Iżda aħna nitolbu li inti żżomm kapijiet tiegħek isfel
jekk int fin-nofs, sabiex inti

1514
01:18:16,540 --> 01:18:19,560
ma jimblokka l-kamera u tuża
il-ħruġ lura jekk għandek.

1515
01:18:19,560 --> 01:18:25,010

1516
01:18:25,010 --> 01:18:26,306
Jien Joseph bil-mod.

1517
01:18:26,306 --> 01:18:27,556
Hi.

1518
01:18:27,556 --> 01:18:37,910

1519
01:18:37,910 --> 01:18:38,630
Test, test.

1520
01:18:38,630 --> 01:18:39,630
Dan, huwa li tajba?

1521
01:18:39,630 --> 01:18:40,880
Kessaħ.

1522
01:18:40,880 --> 01:18:44,460

1523
01:18:44,460 --> 01:18:47,600
>> Allura l-video se jkunu stazzjonati wkoll
online għal dawk li

1524
01:18:47,600 --> 01:18:48,850
ikollhom iħallu issa.

1525
01:18:48,850 --> 01:18:51,350

1526
01:18:51,350 --> 01:18:52,600
Skomdi.

1527
01:18:52,600 --> 01:18:56,300

1528
01:18:56,300 --> 01:18:57,510
OK.

1529
01:18:57,510 --> 01:18:59,730
Allura reviżjoni kwizz.

1530
01:18:59,730 --> 01:19:00,980
Dan huwa qattus.

1531
01:19:00,980 --> 01:19:03,150

1532
01:19:03,150 --> 01:19:07,170
Issa, JavaScript, li hija forsi ma
bħala aww għal xi wħud minnkom guys.

1533
01:19:07,170 --> 01:19:07,370
OK.

1534
01:19:07,370 --> 01:19:09,280
Allura dak l-ewwel, jiġbor lura mingħand Zamyla.

1535
01:19:09,280 --> 01:19:11,270
Ftakar li PHP hija
jimxu fuq il-server.

1536
01:19:11,270 --> 01:19:15,230
U lottijiet ta 'drabi, inti guys kiteb loops
fil-PHP li jistampa HTML, right?

1537
01:19:15,230 --> 01:19:19,170
Allura ladarba dan il-kodiċi tesegwixxi, li
Output HTML li inti jistampa

1538
01:19:19,170 --> 01:19:20,500
gets mibgħuta lill-utent.

1539
01:19:20,500 --> 01:19:25,960
U ladarba dan iseħħ, l-ebda PHP aktar jistgħu
jitmexxew, sakemm inti rikarigu-paġna, tal-

1540
01:19:25,960 --> 01:19:27,660
course, li reexecutes-PHP.

1541
01:19:27,660 --> 01:19:30,080
Imma ladarba inti jistampa li HTML,
inti ma tistax tmur kullimkien.

1542
01:19:30,080 --> 01:19:33,580
>> Allura li HTML hija mibgħuta fuq l-utent,
li hija l-browser hawn fuq, fejn

1543
01:19:33,580 --> 01:19:35,470
Milo qed tuża l-kompjuter.

1544
01:19:35,470 --> 01:19:40,340
U hekk ukoll, hemm diversi affarijiet
ladarba aħna jibgħat HTML għall-utent.

1545
01:19:40,340 --> 01:19:43,350
Kultant rridu nagħmlu xi ħaġa simili
meta tikklikkja fuq xi ħaġa, irridu

1546
01:19:43,350 --> 01:19:47,350
kaxxi ta 'twissija li pop up, dawn it-tipi ta'
interazzjonijiet, bħal meta tagħfas il-

1547
01:19:47,350 --> 01:19:50,740
ewlenin, meta tikklikkja xi ħaġa fuq il-
paġna, nixtieq li jiġri xi ħaġa.

1548
01:19:50,740 --> 01:19:54,550
Ukoll, inti ma tistax reexecute PHP
kodiċi darba li HTML huwa stabbilit.

1549
01:19:54,550 --> 01:19:55,900
Allura kif taħseb li tagħmel dan?

1550
01:19:55,900 --> 01:19:59,930
>> We jintroduċu lingwa ġdida msejħa
JavaScript, li tmur fil-browser

1551
01:19:59,930 --> 01:20:02,890
li jippermetti li inti tagħmel affarijiet
HTML wara li tirċievi

1552
01:20:02,890 --> 01:20:04,020
minnhom mill-server.

1553
01:20:04,020 --> 01:20:07,050
U dan huwa għaliex aħna sejħa hija ta 'naħa tal-klijent
lingwa ta 'programmar.

1554
01:20:07,050 --> 01:20:09,110
Hija taħdem fuq il-kompjuter tiegħek -

1555
01:20:09,110 --> 01:20:11,400
il-klijent.

1556
01:20:11,400 --> 01:20:13,830
Xi mistoqsijiet dwar dan s'issa?

1557
01:20:13,830 --> 01:20:15,650
Li paradigma jagħmel sens li n-nies?

1558
01:20:15,650 --> 01:20:16,010
OK.

1559
01:20:16,010 --> 01:20:16,790
Tajba.

1560
01:20:16,790 --> 01:20:17,340
Kull dritt.

1561
01:20:17,340 --> 01:20:20,850
Allura l-ewwel ħaġa li wieħed jinnota
hija JavaScript mhix PHP.

1562
01:20:20,850 --> 01:20:23,010
>> Huma għandhom xi sintassi differenti,
li aħna ser jmorru fis.

1563
01:20:23,010 --> 01:20:24,530
U għandhom użi differenti ħafna.

1564
01:20:24,530 --> 01:20:26,640
JavaScript, għal darb'oħra, għall tiegħek
browser, għall-klijent.

1565
01:20:26,640 --> 01:20:30,640
Server runs x'imkien fuq xi ħadd ieħor
kompjuter li tibgħat l-informazzjoni

1566
01:20:30,640 --> 01:20:31,720
lilek, tikkoreġi?

1567
01:20:31,720 --> 01:20:36,730
Allura jekk aħna nitolbuk biex jikteb il-kodiċi PHP
fuq kwistjoni eżami, ma jiktbu

1568
01:20:36,730 --> 01:20:38,710
JavaScript u viċi versa.

1569
01:20:38,710 --> 01:20:41,710
Tkun taf biss jitilfu punti,
u mhux se tkun id-dritt.

1570
01:20:41,710 --> 01:20:43,690
>> Mela ejja nikseb fis xi
differenzi sintassi -

1571
01:20:43,690 --> 01:20:46,140
JavaScript fuq ix-xellug
u PHP fuq il-lemin.

1572
01:20:46,140 --> 01:20:48,670
L-ewwel ħaġa tkun taf Avviż ma
JavaScript, aħna niddikjaraw varjabbli ma

1573
01:20:48,670 --> 01:20:49,440
l-keyword var -

1574
01:20:49,440 --> 01:20:53,590
V-A-R. PHP użat is-sinjal dollaru,
kif Zamyla diskuss qabel.

1575
01:20:53,590 --> 01:20:57,570
Jekk inti tixtieq li jiddikjara assoċjattiva
array, naraw l-sintassi familjari fuq

1576
01:20:57,570 --> 01:20:59,030
il-lemin ma PHP.

1577
01:20:59,030 --> 01:21:01,630
Fuq in-naħa tax-xellug, minflok
tuża braces kaboċċi.

1578
01:21:01,630 --> 01:21:03,280
U mbagħad ċwievet tiegħek huma fuq ix-xellug.

1579
01:21:03,280 --> 01:21:04,670
Imbagħad inti għandek kolon.

1580
01:21:04,670 --> 01:21:06,560
U allura inti għandek l-valuri
li tixtieq.

1581
01:21:06,560 --> 01:21:09,840
>> Allura dan huwa kif inti tagħmel dan fil-PHP
fuq il-lemin ma 'dak tat-tieni

1582
01:21:09,840 --> 01:21:10,955
Linja li tibda fuq Milo.

1583
01:21:10,955 --> 01:21:14,540
U dan huwa kif inti tagħmel dan fuq il-
xellug ġenb fl JavaScript jekk inti tixtieq

1584
01:21:14,540 --> 01:21:16,110
nsejħu oġġett.

1585
01:21:16,110 --> 01:21:19,340
U oġġetti fl JavaScript huma
biss arrays assoċjattiva.

1586
01:21:19,340 --> 01:21:23,710
Mela jekk inti tixtieq li aċċess oqsma, fil-
PHP tuża dan sintassi bracket.

1587
01:21:23,710 --> 01:21:27,170
U b'dan il-mod, inti tista 'jassenja mill-ġdid
qasam sid biex Lauren.

1588
01:21:27,170 --> 01:21:30,150
>> Ukoll, fl JavaScript, jekk wieħed jixtiequ
aċċess għal qasam u l-bidla, inti tista '

1589
01:21:30,150 --> 01:21:31,370
jużaw il-dot sintassi.

1590
01:21:31,370 --> 01:21:33,860
Tista 'wkoll tuża l-sintassi bracket.

1591
01:21:33,860 --> 01:21:35,550
Imma inti ma tistax tuża l-
dot sintassi fil-PHP.

1592
01:21:35,550 --> 01:21:36,525
Dan mhux se taħdem.

1593
01:21:36,525 --> 01:21:38,910
Jaħdem biss fil-PHP.

1594
01:21:38,910 --> 01:21:42,060
U fl-aħħarnett, li jistampaw affarijiet li l-
console, tuża console.log, li

1595
01:21:42,060 --> 01:21:43,720
inti guys jużaw ħafna fil pset8.

1596
01:21:43,720 --> 01:21:45,260
Tista console.log dik.

1597
01:21:45,260 --> 01:21:50,030
>> Jekk inti tixtieq li jistampaw firxa fil-
PHP, inti għandek tuża print r.

1598
01:21:50,030 --> 01:21:53,240
U fuq il-lemin, tara i hash
konkatenazzjoni string hemmhekk.

1599
01:21:53,240 --> 01:21:54,070
Xi ħadd talab qabel.

1600
01:21:54,070 --> 01:21:55,850
I użu plus JavaScript.

1601
01:21:55,850 --> 01:21:59,800
Jekk irrid concatenate xi ħaġa
fil-PHP, I jużaw il-dot.

1602
01:21:59,800 --> 01:22:00,800
Dawn huma differenti.

1603
01:22:00,800 --> 01:22:03,420
Jekk int bil-miktub kodiċi PHP,
ma jużawx plus.

1604
01:22:03,420 --> 01:22:06,810
Jekk int bil-miktub JavaScript
kodiċi, ma jiktbu dot.

1605
01:22:06,810 --> 01:22:08,230
Dan se jkun żbaljat.

1606
01:22:08,230 --> 01:22:09,640
U tkun taf tkun imdejjaq.

1607
01:22:09,640 --> 01:22:11,000
>> Differenzi So sintassi.

1608
01:22:11,000 --> 01:22:14,710
Know sintassi tiegħek, għaliex jekk inti għandek
jiktbu kwistjoni u tuża s-sintassi

1609
01:22:14,710 --> 01:22:16,890
mill-lingwa ħażin,
mhux se taħdem.

1610
01:22:16,890 --> 01:22:19,520
U se jkun żbaljat.

1611
01:22:19,520 --> 01:22:22,420
Mela ejja nitkellmu dwar xi kontroll
fluss differenzi, kif tuża

1612
01:22:22,420 --> 01:22:24,040
loops f'kull wieħed minnhom.

1613
01:22:24,040 --> 01:22:26,610
Zamyla marru fuq il-lemin.

1614
01:22:26,610 --> 01:22:27,780
Jittieħed fuq il-lemin
għandhom ikunu familjari.

1615
01:22:27,780 --> 01:22:29,670
Ejja nħarsu lejn fuq ix-xellug.

1616
01:22:29,670 --> 01:22:34,830
>> Meta tuża għal loop n fl JavaScript,
loop varjabbli tiegħek, var i hemmhekk,

1617
01:22:34,830 --> 01:22:37,210
loop fuq l-ċwievet ta 'l-array.

1618
01:22:37,210 --> 01:22:39,150
Allura inti tara l-isem, house, u r-rwol.

1619
01:22:39,150 --> 01:22:42,440
Jekk I console.log i, I nikseb
isem, house, u r-rwol.

1620
01:22:42,440 --> 01:22:44,720
Dawk huma ċ-ċwievet.

1621
01:22:44,720 --> 01:22:50,080
Fil JavaScript, linja foreach tmur
fuq il-valuri ta 'dan array.

1622
01:22:50,080 --> 01:22:52,040
Allura tinnota li qed kemm i.

1623
01:22:52,040 --> 01:22:56,000
Iżda fil hawn fuq in-naħa PHP, prints
out Milo, CS50, u Mascot.

1624
01:22:56,000 --> 01:22:57,390
Dawk huma l-valuri fil-PHP.

1625
01:22:57,390 --> 01:23:00,180
>> Allura dawn huma kif dawn tnejn huma differenti
fil-lingwi differenti.

1626
01:23:00,180 --> 01:23:02,970
Mela jekk inti qed tuża foreach
loop, ma jassumu li

1627
01:23:02,970 --> 01:23:03,760
jagħtik l-keys.

1628
01:23:03,760 --> 01:23:08,010
U jekk inti qed tuża għal loop n, ma
jassumi li tagħtik il-valuri.

1629
01:23:08,010 --> 01:23:10,420
Ma dan jagħmel sens s'issa?

1630
01:23:10,420 --> 01:23:13,630
Il-slide li jmiss se nuruk
kif inti tista 'aċċess l-oppost fil-

1631
01:23:13,630 --> 01:23:15,160
kull wieħed minnhom.

1632
01:23:15,160 --> 01:23:18,550
>> Ukoll, jekk inti għandek l-ewlieni fl JavaScript
u inti tixtieq l-valur out,

1633
01:23:18,550 --> 01:23:20,440
inti biss indiċi fil-
array ma 'dak.

1634
01:23:20,440 --> 01:23:23,640
Allura Milo ta 'i se tikseb dak
inti tixtieq - il-valuri.

1635
01:23:23,640 --> 01:23:25,260
Hemm dan sintassi differenti fil-PHP.

1636
01:23:25,260 --> 01:23:28,140
Jekk verament trid tkun taf dan, jien ma
think we ve wera li int s'issa.

1637
01:23:28,140 --> 01:23:31,740
Imma jekk int interessat, inti tista 'tuża
dan sintassi addizzjonali fuq il-lemin

1638
01:23:31,740 --> 01:23:35,130
naħa li fil-fatt se let ikollok l-
ċwievet PHP meta inti qed tuża

1639
01:23:35,130 --> 01:23:35,880
loop foreach.

1640
01:23:35,880 --> 01:23:39,640
Hekk biss ftit ta 'trivia
jekk int interessat.

1641
01:23:39,640 --> 01:23:42,630
>> Allura dan huwa biss sabiex juru l-
differenzi bejn dawn iż-żewġ linji.

1642
01:23:42,630 --> 01:23:47,060
Tħallatx lilhom up meta int
programmazzjoni kwistjoni.

1643
01:23:47,060 --> 01:23:49,774
Xi mistoqsijiet dwar dan.

1644
01:23:49,774 --> 01:23:50,770
Kessaħ.

1645
01:23:50,770 --> 01:23:51,310
Kull dritt.

1646
01:23:51,310 --> 01:23:52,250
JavaScript oġġetti.

1647
01:23:52,250 --> 01:23:53,040
I tkellmu dwarhom.

1648
01:23:53,040 --> 01:23:54,650
Huma qed simili arrays assoċjattiva.

1649
01:23:54,650 --> 01:23:57,730
L-unika ħaġa nixtieq għalik li tinnota
hawnhekk hija li valur fi assoċjattiva

1650
01:23:57,730 --> 01:23:59,540
firxa jistgħu jiġu xejn fl JavaScript.

1651
01:23:59,540 --> 01:24:02,240
>> Dan jista 'saħansitra jkun funzjoni,
simili hemmhekk.

1652
01:24:02,240 --> 01:24:04,600
I jkollhom funzjoni li
hija valur ta 'ċavetta.

1653
01:24:04,600 --> 01:24:07,030
U jekk irrid li jikkontestaw din il-funzjoni,
I biss aċċess qoxra.

1654
01:24:07,030 --> 01:24:08,490
U mbagħad I tpoġġi l-parentesi
wara dik.

1655
01:24:08,490 --> 01:24:09,790
U li x-xogħlijiet.

1656
01:24:09,790 --> 01:24:15,570
Allura xi mistoqsijiet?

1657
01:24:15,570 --> 01:24:16,370
Nru?

1658
01:24:16,370 --> 01:24:16,650
OK.

1659
01:24:16,650 --> 01:24:18,190
Tajba.

1660
01:24:18,190 --> 01:24:20,130
JavaScript, bħal PHP,
huwa laxk ittajpjat.

1661
01:24:20,130 --> 01:24:20,970
X'ifisser dan?

1662
01:24:20,970 --> 01:24:22,380
>> Huwa ma jkollu tipi.

1663
01:24:22,380 --> 01:24:24,800
Imma meta inti tiddikjara JavaScript
varjabbli, inti tgħidli i var.

1664
01:24:24,800 --> 01:24:25,850
Inti ma jgħidu li din.

1665
01:24:25,850 --> 01:24:26,460
Li mhux xi ħaġa.

1666
01:24:26,460 --> 01:24:28,000
Inti biss jgħidu huwa varjabbli.

1667
01:24:28,000 --> 01:24:31,590
U mbagħad JavaScript se tieħu ħsieb l-
tipi taħt il-barnuża għalik.

1668
01:24:31,590 --> 01:24:34,390
Nistgħu jikkonvertu liberament bejn
tipi minħabba dan.

1669
01:24:34,390 --> 01:24:37,360
Hekk i tibda bħala numru
f'dan il-każ.

1670
01:24:37,360 --> 01:24:38,790
U mbagħad I jkollhom string.

1671
01:24:38,790 --> 01:24:39,710
And I żid i lilha.

1672
01:24:39,710 --> 01:24:41,810
U jien jassenja mill-ġdid lura fil i.

1673
01:24:41,810 --> 01:24:43,640
>> Allura fuq l-ewwel linja,
i huwa n-numru.

1674
01:24:43,640 --> 01:24:47,310
Fit-tieni linja, i issa isir
string wara I jagħmlu l-assenjar mill-ġdid.

1675
01:24:47,310 --> 01:24:52,820
U hawn, jien biss concatenating
dak in-numru fuq il-sekwenza.

1676
01:24:52,820 --> 01:24:56,210
Allura inti tara li anki jekk i kien
numru sħiħ fl-ewwel parti, huwa sort

1677
01:24:56,210 --> 01:24:58,500
ta 'prodotti simili li jkunu konvertiti għal
spag u mbagħad qed jiżdiedu

1678
01:24:58,500 --> 01:25:00,510
fuq dak string bonjour.

1679
01:25:00,510 --> 01:25:02,340
U hekk dan huwa dak li jfisser I
mill-ittajpjar laxka.

1680
01:25:02,340 --> 01:25:04,760
Dak li inti jikkonvertu bejn
tipi faċilment.

1681
01:25:04,760 --> 01:25:08,840
U ma tarmi twissijiet
lejn tixtieq C ma.

1682
01:25:08,840 --> 01:25:12,420
>> Hekk i issa fih bonjour
123 tad-sekwenza.

1683
01:25:12,420 --> 01:25:13,270
Next.

1684
01:25:13,270 --> 01:25:15,610
Nistgħu wkoll iqabbel liberament
bejn it-tipi.

1685
01:25:15,610 --> 01:25:19,310
Mela jekk inti biss tuża ==, ħafna
bħal fil-PHP, JavaScript

1686
01:25:19,310 --> 01:25:20,480
ma ħaġa simili.

1687
01:25:20,480 --> 01:25:24,780
Il string 123 huwa l-istess bħan-numru
123 meta tuża ugwali doppja.

1688
01:25:24,780 --> 01:25:27,820
Meta użat ugwali triplu, huwa wkoll
trid li tiżgura li

1689
01:25:27,820 --> 01:25:29,240
it-tip huwa l-istess.

1690
01:25:29,240 --> 01:25:31,960
Hekk minħabba li huwa string u li huwa
numru, anki jekk dawn qed kemm

1691
01:25:31,960 --> 01:25:35,280
123, meta tuża triple
ugwali, ikollok falza.

1692
01:25:35,280 --> 01:25:39,330
Fil-double ugwali każ, ikollok veru,
minħabba ugwali doppja ma

1693
01:25:39,330 --> 01:25:40,020
jimpurtahom tip.

1694
01:25:40,020 --> 01:25:42,500
Ugwali Triple ma jimpurtahom tip.

1695
01:25:42,500 --> 01:25:43,750
Mistoqsijiet?

1696
01:25:43,750 --> 01:25:45,790

1697
01:25:45,790 --> 01:25:48,390
OK.

1698
01:25:48,390 --> 01:25:52,870
>> U ħaġa oħra dwar JavaScript huwa
iskop huwa tip ta 'globali sakemm int

1699
01:25:52,870 --> 01:25:53,460
fil-funzjoni.

1700
01:25:53,460 --> 01:25:55,660
U taħdem l-istess
mod PHP attwalment.

1701
01:25:55,660 --> 01:25:57,500
Mela ejja jgħaddu dan l-eżempju.

1702
01:25:57,500 --> 01:25:59,110
I sett i sa 999.

1703
01:25:59,110 --> 01:26:00,900
U mbagħad mmur fis dan għal loop.

1704
01:26:00,900 --> 01:26:06,110
Mela jekk jien istampar i f'din għal
loop, I jistennew 0, 1, 2, 3, 4.

1705
01:26:06,110 --> 01:26:07,390
Nasal biex i = 4.

1706
01:26:07,390 --> 01:26:10,770
Hija inkrementi i issa sa 5 fil-
tmiem il-għall-loop.

1707
01:26:10,770 --> 01:26:13,300
U mbagħad pawżi barra mill-linja,
minħabba li ma tissodisfax il-

1708
01:26:13,300 --> 01:26:14,550
kundizzjoni jibqgħalu.

1709
01:26:14,550 --> 01:26:16,650
>> X'taħseb li jmiss
console.log tistampa?

1710
01:26:16,650 --> 01:26:20,570

1711
01:26:20,570 --> 01:26:24,790
Allura dan huwa dak li se tagħmel fl C. C,
għaliex jekk għandek bħal var i barra

1712
01:26:24,790 --> 01:26:28,855
u inti għandek i var ġewwa loop, bħal
għall-loop, allura jagħmel dan b'mod li

1713
01:26:28,855 --> 01:26:30,690
huwa scoped li ż-żewġ
i huma differenti.

1714
01:26:30,690 --> 01:26:34,630
Fil JavaScript, se biss
titratta dan bħala l-istess i.

1715
01:26:34,630 --> 01:26:37,870
I nikseb 5, minħabba li kien il-valur
wara li ħareġ barra mill-linja.

1716
01:26:37,870 --> 01:26:39,120
Allura dawk i huma l-istess i.

1717
01:26:39,120 --> 01:26:42,620

1718
01:26:42,620 --> 01:26:44,130
Does li jagħmel sens?

1719
01:26:44,130 --> 01:26:45,720
>> Ukoll, jagħmel sens minn
lat JavaScript.

1720
01:26:45,720 --> 01:26:49,510
Iżda l-istess paradigma ma
jitmexxew għas C. Huma għandhom

1721
01:26:49,510 --> 01:26:50,310
regoli dwar l-ambitu differenti.

1722
01:26:50,310 --> 01:26:50,630
Iva.

1723
01:26:50,630 --> 01:26:52,566
>> UDJENZA: [inaudible]

1724
01:26:52,566 --> 01:26:54,990
barra l-funzjoni [inaudible]?

1725
01:26:54,990 --> 01:26:58,340
>> JOSEPH ONG: Allura barra li jiffunzjonaw?

1726
01:26:58,340 --> 01:27:00,810
So I ser jiksbu għal dak fi ftit tieni.

1727
01:27:00,810 --> 01:27:02,580
Allura aħna sejħa foo (i).

1728
01:27:02,580 --> 01:27:06,920
Din tgħaddi i fil foo, inkrimenti
, u mbagħad zkuk dan.

1729
01:27:06,920 --> 01:27:07,750
Allura kien 5.

1730
01:27:07,750 --> 01:27:09,210
Biex dan isir 6.

1731
01:27:09,210 --> 01:27:11,670
Imma dak li jien jitkellem dwar huwa
li i f'dik il-funzjoni.

1732
01:27:11,670 --> 01:27:14,430
Għaliex dan huwa parametru, huwa
scoped għal dik il-funzjoni.

1733
01:27:14,430 --> 01:27:17,800
Allura ladarba I attwalment tikseb minn dak
funzjoni, huwa issa se jmorru

1734
01:27:17,800 --> 01:27:19,860
lura għall-i qodma.

1735
01:27:19,860 --> 01:27:23,000
Li i huwa scoped biss minħabba
huwa fil-funzjoni.

1736
01:27:23,000 --> 01:27:24,200
U aħna għandna ambitu u l-funzjonijiet.

1737
01:27:24,200 --> 01:27:29,080
Iżda aħna ma jkollhomx skop barra
tal-funzjonijiet JavaScript.

1738
01:27:29,080 --> 01:27:31,170
Does li jagħmel sens?

1739
01:27:31,170 --> 01:27:31,320
Iva.

1740
01:27:31,320 --> 01:27:31,660
Mistoqsija.

1741
01:27:31,660 --> 01:27:34,030
>> UDJENZA: Istess [inaudible]?

1742
01:27:34,030 --> 01:27:34,500
>> JOSEPH ONG: So yeah.

1743
01:27:34,500 --> 01:27:36,260
Fil-PHP, huwa l-istess tip ta 'ħaġa.

1744
01:27:36,260 --> 01:27:37,680
Hemm subtlety żgħir attwalment.

1745
01:27:37,680 --> 01:27:40,130
Iżda int tista 'tistaqsi lili dwar
li wara r-reviżjoni.

1746
01:27:40,130 --> 01:27:43,930
Inti ma verament bżonn tkun taf
li subtlety għall-kwizz.

1747
01:27:43,930 --> 01:27:47,600
Għall-finijiet u effetti kollha, bħal
varjabbli, globali u PHP, sakemm

1748
01:27:47,600 --> 01:27:49,150
dawn qed fil-funzjoni, l-istess
ħaġa JavaScript.

1749
01:27:49,150 --> 01:27:49,480
Iva.

1750
01:27:49,480 --> 01:27:52,890
>> UDJENZA: Għaliex hija din permess
JavaScript u l-ebda fejn ħaddieħor?

1751
01:27:52,890 --> 01:27:55,010
>> JOSEPH ONG: Allura għaliex hi permessa
fl JavaScript u mhux fis-C?

1752
01:27:55,010 --> 01:27:58,180
Huwa biss min ħareġ bi
JavaScript iddeċieda li dan kien OK fi

1753
01:27:58,180 --> 01:27:59,510
JavaScript.

1754
01:27:59,510 --> 01:28:02,430
Allura huwa biss bħal lingwa ta 'programmar
konvenzjoni kif aħna ngħid.

1755
01:28:02,430 --> 01:28:02,580
Iva.

1756
01:28:02,580 --> 01:28:04,480
>> UDJENZA: Allura għaliex ma
tmur 6-5?

1757
01:28:04,480 --> 01:28:08,280
>> JOSEPH ONG: Allura huwa marru 6-5,
għaliex meta I għadda i fis foo, li

1758
01:28:08,280 --> 01:28:13,420
i ġewwa ta 'foo issa scoped li foo,
għax l-ambitu jeżisti fil-funzjonijiet

1759
01:28:13,420 --> 01:28:15,050
JavaScript.

1760
01:28:15,050 --> 01:28:18,720
Imma darba I toħroġ hawn, għaliex
kien scoped il-funzjoni, jien biss

1761
01:28:18,720 --> 01:28:24,300
użu tal-i regolari li kien ġewwa
il-bqija tal-fluss kontroll.

1762
01:28:24,300 --> 01:28:25,210
Jagħmel sens?

1763
01:28:25,210 --> 01:28:26,910
Nista jimxu fuq?

1764
01:28:26,910 --> 01:28:27,320
Kull dritt.

1765
01:28:27,320 --> 01:28:29,180
Kessaħ.

1766
01:28:29,180 --> 01:28:31,890
>> L-aċċettazzjoni ta 'dan huwa oġġetti
huma mgħoddija permezz ta 'referenza.

1767
01:28:31,890 --> 01:28:33,990
Inti taf kif meta inti tgħaddi
firxa fis C inti tista '

1768
01:28:33,990 --> 01:28:35,810
attwalment jimmodifika l-firxa?

1769
01:28:35,810 --> 01:28:37,350
Huwa l-istess ħaġa fil-JavaScript.

1770
01:28:37,350 --> 01:28:42,960
Jekk I jgħaddu oġġett, f'dan il-każ, I
mgħoddija Milo fis din il-funzjoni catify.

1771
01:28:42,960 --> 01:28:44,490
Milo jibda.

1772
01:28:44,490 --> 01:28:46,310
Ismu huwa Milo Banana.

1773
01:28:46,310 --> 01:28:51,670
I jgħaddu dak l-oġġett fil-funzjoni
għaliex dan huwa oġġett, l assoċjattiv

1774
01:28:51,670 --> 01:28:53,730
array fl JavaScript.

1775
01:28:53,730 --> 01:28:57,110
>> Meta I jwettaq operazzjoni
f'dik il-funzjoni, se

1776
01:28:57,110 --> 01:28:58,560
attwalment ibiddlu l-oġġett.

1777
01:28:58,560 --> 01:29:01,720
Allura dan jiġri biss għal oġġetti
fl JavaScript, biss bhalu jiġri

1778
01:29:01,720 --> 01:29:09,230
għall arrays ġewwa ta 'isem C. So Milo tal
fil-fatt se jsiru qattus issa.

1779
01:29:09,230 --> 01:29:10,090
Does li jagħmel sens?

1780
01:29:10,090 --> 01:29:11,840
Allura dan jaħdem biss għal oġġetti.

1781
01:29:11,840 --> 01:29:13,090
Oġġetti huma mgħoddija permezz ta 'referenza.

1782
01:29:13,090 --> 01:29:13,400
Iva.

1783
01:29:13,400 --> 01:29:16,850
>> UDJENZA: Allura inti qed tgħid li
b'kuntrast ma 'varjabbli i.

1784
01:29:16,850 --> 01:29:17,240
>> JOSEPH ONG: Yeah.

1785
01:29:17,240 --> 01:29:20,330
Liema varjabbli i kien biss
numru, id-dritt?

1786
01:29:20,330 --> 01:29:25,280
Huwa simili fis-C meta inti tgħaddi l-
Integer a, jagħmel kopja.

1787
01:29:25,280 --> 01:29:28,130
U meta inti tgħaddi firxa, attwalment
bidliet l-firxa attwali

1788
01:29:28,130 --> 01:29:32,870
C. L-istess ħaġa jiġri ma
JavaScript f'dan il-każ.

1789
01:29:32,870 --> 01:29:34,070
Kull dritt.

1790
01:29:34,070 --> 01:29:38,134
U li jmiss, Milo huwa imdejjaq għax
hu issa qattus.

1791
01:29:38,134 --> 01:29:40,790

1792
01:29:40,790 --> 01:29:45,060
Dan kien fil-fatt Milo wara
xi vjaġġ għall-vet.

1793
01:29:45,060 --> 01:29:46,860
>> Allura kif nistgħu jużaw JavaScript
fil-paġna web?

1794
01:29:46,860 --> 01:29:47,790
Nistgħu jinkludiha.

1795
01:29:47,790 --> 01:29:50,090
Dan huwa HTML code ma 'l-tags strixxa.

1796
01:29:50,090 --> 01:29:51,300
So I jkollhom tags strixxa hemmhekk.

1797
01:29:51,300 --> 01:29:54,820
U mbagħad I jqajjem xi JavaScript
kodiċi fil-tags iskrittura.

1798
01:29:54,820 --> 01:29:56,390
U allura tesegwixxi dan.

1799
01:29:56,390 --> 01:29:58,830
Meta I biss tagħmel dan bħal dan, huwa
imsejħa JavaScript inline.

1800
01:29:58,830 --> 01:30:02,400
Huwa tip ta 'messy, minħabba li l-
JavaScript huwa attwalment fil-HTML.

1801
01:30:02,400 --> 01:30:07,010
>> A aħjar mod biex isir dan, ħafna nicer,
huwa li tikteb tiegħek JavaScript fi

1802
01:30:07,010 --> 01:30:10,920
fajl estern u mbagħad jipprovdu
l-tag iskrittura ma 'sors.

1803
01:30:10,920 --> 01:30:14,920
U dan se jmorru għal dan il-fajl JavaScript
u aqra l-kodiċi JavaScript minn

1804
01:30:14,920 --> 01:30:15,960
dan il-fajl minflok.

1805
01:30:15,960 --> 01:30:18,820
U b'dan il-mod, inti ma għandekx ħafna ta '
JavaScript fil-bidu tal tiegħek

1806
01:30:18,820 --> 01:30:20,760
File HTML, li jagħmel
huwa verament messy.

1807
01:30:20,760 --> 01:30:21,860
Inti biss jitqiegħed x'imkien ieħor.

1808
01:30:21,860 --> 01:30:24,310
U mbagħad se taqrah minn hemm.

1809
01:30:24,310 --> 01:30:25,560
Ma li jagħmel sens?

1810
01:30:25,560 --> 01:30:27,990

1811
01:30:27,990 --> 01:30:29,640
>> Kwistjonijiet Pjazzament.

1812
01:30:29,640 --> 01:30:32,620
F'dan il-każ partikolari, il-
iskrittura huwa quddiem il-korp.

1813
01:30:32,620 --> 01:30:36,090
Allura meta I tesegwixxi dik, hemm
xejn fil-ġisem għadhom.

1814
01:30:36,090 --> 01:30:39,920
Forsi din se tagħmel ftit aktar
sens meta I juru din il-parti li jmiss.

1815
01:30:39,920 --> 01:30:43,210
F'dan il-każ, l-iskrittura
jiġi wara l-div.

1816
01:30:43,210 --> 01:30:46,620
Allura l-div attwalment tidher
fuq il-paġna ewwel.

1817
01:30:46,620 --> 01:30:49,470
Dritt hawn dan iċ-ċirku aħmar ftit,
tara t-test jidher.

1818
01:30:49,470 --> 01:30:51,810
U allura l-allert turi up.

1819
01:30:51,810 --> 01:30:54,890
>> Fl-ewwel każ, minħabba li l-iskrittura
kien qabel il-div, il-

1820
01:30:54,890 --> 01:30:56,170
twissija turi up ewwel.

1821
01:30:56,170 --> 01:30:59,250
U allura l-div turi up wara
inti tiċħad l-kaxxa.

1822
01:30:59,250 --> 01:31:01,330
Allura l-eżekuzzjoni kwistjonijiet.

1823
01:31:01,330 --> 01:31:02,290
Allura aħna ser jżomm dan f'moħħu.

1824
01:31:02,290 --> 01:31:03,640
Dan se jkun importanti
fi ftit.

1825
01:31:03,640 --> 01:31:08,730

1826
01:31:08,730 --> 01:31:09,540
OK.

1827
01:31:09,540 --> 01:31:12,750
Hekk ukoll, kif taħseb li jistenna sakemm il-
paġna kollha hija mgħobbija allura qabel ma inti

1828
01:31:12,750 --> 01:31:13,580
tesegwixxi xi kodiċi?

1829
01:31:13,580 --> 01:31:15,540
Aħna ser tikseb fis dan ftit
ftit aktar tard wisq.

1830
01:31:15,540 --> 01:31:19,016
Iżda biss iżommu dan it-tqegħid
kwistjonijiet fil-moħħ għal meta aħna

1831
01:31:19,016 --> 01:31:20,570
jaslu għal slide ieħor.

1832
01:31:20,570 --> 01:31:22,030
>> Allura irridu jiksbu l DOM issa.

1833
01:31:22,030 --> 01:31:23,550
U dak li huwa DOM?

1834
01:31:23,550 --> 01:31:26,830
Mela jekk inti tħares lejn HTML code, huwa biss
mazz ta 'test fuq l-iskrin.

1835
01:31:26,830 --> 01:31:30,560
Allura kif ma JavaScript taf li
dan huwa element HTML?

1836
01:31:30,560 --> 01:31:33,410
Hekk aħna li jkollhom xi memorja
rappreżentanza ta 'dan

1837
01:31:33,410 --> 01:31:34,930
istruttura li għandna.

1838
01:31:34,930 --> 01:31:40,240
U kull meta aħna għandna dan fil-memorja
rappreżentazzjoni fil-JavaScript, nagħmlu sejħa

1839
01:31:40,240 --> 01:31:41,750
li l-DOM.

1840
01:31:41,750 --> 01:31:45,130
U huwa biss mod li persuni deċiż
li għandna jirrappreżenta dan

1841
01:31:45,130 --> 01:31:46,400
Istruttura HTML bħala.

1842
01:31:46,400 --> 01:31:47,940
>> U dan xi DOM look like?

1843
01:31:47,940 --> 01:31:50,460
Ukoll, fir-rappreżentanza tal-memorja,
nieħdu dan it-test.

1844
01:31:50,460 --> 01:31:52,870
U aħna jibdluh memorja
rappreżentazzjoni.

1845
01:31:52,870 --> 01:31:54,400
Allura dan huwa l-HTML.

1846
01:31:54,400 --> 01:31:58,090
Allura aħna l-ewwel issir taf li kull
Siġra DOM għandha dokument.

1847
01:31:58,090 --> 01:31:59,400
Jidher qisu siġra.

1848
01:31:59,400 --> 01:32:03,550
U d-dokument fih l-HTML
tikketta, fil-fatt kollox

1849
01:32:03,550 --> 01:32:05,150
ġewwa ta 'dan issa.

1850
01:32:05,150 --> 01:32:06,970
Il-lametta HTML għandu żewġt itfal.

1851
01:32:06,970 --> 01:32:08,630
Hija għandha ras.

1852
01:32:08,630 --> 01:32:12,380
Dan il-kap, jekk inti tħares lejn indentazzjoni
minn hemm lejn kif huwa strutturat

1853
01:32:12,380 --> 01:32:14,960
bejn il-tags qrib,
ras għandha wild.

1854
01:32:14,960 --> 01:32:17,130
Il-minuri huwa titolu.

1855
01:32:17,130 --> 01:32:18,370
Eżattament.

1856
01:32:18,370 --> 01:32:21,000
>> Issa, għandna tfal korp.

1857
01:32:21,000 --> 01:32:24,870
U allura dak il-korp ikollu
tfal imsejħa familja.

1858
01:32:24,870 --> 01:32:27,950
U li l-familja għandu tlett itfal -

1859
01:32:27,950 --> 01:32:29,550
eqdem, tan-nofs, u iżgħar.

1860
01:32:29,550 --> 01:32:31,960
Allura inti għandek tkun taf kif tfassal dijagramma
bħal dan meta aħna nistaqsu kif inti

1861
01:32:31,960 --> 01:32:34,270
jiġbed dijagramma meta nagħtu
inti l-HTML fuq ix-xellug.

1862
01:32:34,270 --> 01:32:36,350
Taf kif biex jipproduċu l-siġra DOM.

1863
01:32:36,350 --> 01:32:38,930
U ġewwa ta 'dawn l-affarijiet, hemm biss
xi test, li stajt rappreżentati

1864
01:32:38,930 --> 01:32:40,180
kaxxi bħala ftit.

1865
01:32:40,180 --> 01:32:42,750

1866
01:32:42,750 --> 01:32:47,980
>> Ma din l-istruttura siġra DOM jagħmlu
sens u dak l DOM hu?

1867
01:32:47,980 --> 01:32:49,300
Allura dak li l p toqgħod għal?

1868
01:32:49,300 --> 01:32:51,850
Hawn fuq, il-p hemmhekk
f'dak tag jirrappreżenta

1869
01:32:51,850 --> 01:32:54,510
paragrafu tag HTML.

1870
01:32:54,510 --> 01:32:57,080
Allura inti tista 'tfittex it up.

1871
01:32:57,080 --> 01:32:59,290
Iżda hija biss ifisser li huwa xi
spazju għal xi test.

1872
01:32:59,290 --> 01:33:02,910
U għandha xi CSS grafika default,
għaliex dan huwa punt tag.

1873
01:33:02,910 --> 01:33:05,130
Imma ma verament tinkwieta dwar
dik il-parti wisq.

1874
01:33:05,130 --> 01:33:07,510
Just taf huwa placeholder
għal xi test.

1875
01:33:07,510 --> 01:33:08,480
Iva.

1876
01:33:08,480 --> 01:33:10,200
Mistoqsija?

1877
01:33:10,200 --> 01:33:11,021
Iva.

1878
01:33:11,021 --> 01:33:12,374
>> UDJENZA: Inti biss CSS imsemmi.

1879
01:33:12,374 --> 01:33:15,492
Il-familja hash u l-hash
dak kollu li Jittieħed huwa bażikament

1880
01:33:15,492 --> 01:33:17,400
jirrappreżentaw IDs fl CSS?

1881
01:33:17,400 --> 01:33:18,440
>> JOSEPH ONG: Yeah, eżattament.

1882
01:33:18,440 --> 01:33:20,380
I ser tingħata biex dak li dawn hashes
jfissru fit-tieni.

1883
01:33:20,380 --> 01:33:23,480
Meta Angela marru fuq CSS, hi
tkellem dwar seletturi CSS.

1884
01:33:23,480 --> 01:33:26,770
Dawn huma l-seletturi CSS li
hi kien jitkellem dwar.

1885
01:33:26,770 --> 01:33:28,268
Iva, Rob?

1886
01:33:28,268 --> 01:33:32,060
>> ROB BOWDEN: Nixtieq ukoll jikkummentaw
li DOM ġewwa ta 'lametta tal-titolu

1887
01:33:32,060 --> 01:33:35,385
huwa wkoll node test.

1888
01:33:35,385 --> 01:33:36,070
>> JOSEPH ONG: Dritt.

1889
01:33:36,070 --> 01:33:38,370
Allura ġewwa l-tikketta titolu,
Għandi xi DOM test.

1890
01:33:38,370 --> 01:33:42,730
Allura verament, dan it-titolu għandu jkollhom bħal
kaxxa ftit ġejjin off ta 'dan ukoll.

1891
01:33:42,730 --> 01:33:45,740
Iżda dan ma verament kwistjoni
wisq f'dan il-każ.

1892
01:33:45,740 --> 01:33:49,620
Aħna ma verament jimpurtak lymph test,
kif insejħulhom, wisq.

1893
01:33:49,620 --> 01:33:50,270
OK, nagħmlu.

1894
01:33:50,270 --> 01:33:51,520
Apparentement, nagħmlu.

1895
01:33:51,520 --> 01:33:54,260

1896
01:33:54,260 --> 01:33:57,100
U jien se tiffissa li meta
I upload darb'oħra.

1897
01:33:57,100 --> 01:33:59,830
Does li jagħmel sens?

1898
01:33:59,830 --> 01:34:01,160
>> Allura kif nistgħu naħdmu mal-DOM?

1899
01:34:01,160 --> 01:34:03,790
Kull meta inti jittrattaw mal-DOM b'mod
JavaScript, hemm żewġ passi.

1900
01:34:03,790 --> 01:34:05,030
Inti tagħżel element DOM.

1901
01:34:05,030 --> 01:34:06,580
U allura inti tagħmel affarijiet lilha.

1902
01:34:06,580 --> 01:34:11,480
Allura f'dan il-każ, astratt, stajt
magħżula l-element nofs.

1903
01:34:11,480 --> 01:34:14,530
U mbagħad eżempju ta 'kif isir għalf
li ikun tibdil fit-test.

1904
01:34:14,530 --> 01:34:16,020
Li jintuża biex tkun Bob.

1905
01:34:16,020 --> 01:34:19,930
Issa, dak li għamilt biex kien I mibdula
Bob biex Milo f'dan il-każ.

1906
01:34:19,930 --> 01:34:22,130
>> Allura kif nistgħu fil-fatt jagħmlu dan?

1907
01:34:22,130 --> 01:34:23,440
Kif nistgħu nagħmlu l-għażla?

1908
01:34:23,440 --> 01:34:26,560
U kif nistgħu nagħmlu l-tagħmel għalf li
il-ħaġa ladarba aħna ħadt dan?

1909
01:34:26,560 --> 01:34:30,470
Ukoll, il-mod inti guys jkunu tgħallmu
f'din il-klassi huwa billi tuża xi ħaġa li aħna

1910
01:34:30,470 --> 01:34:32,420
imsejħa jQuery.

1911
01:34:32,420 --> 01:34:33,910
Allura x'inhu jQuery?

1912
01:34:33,910 --> 01:34:37,220
jQuery hija librerija li jagħmel
JavaScript aktar faċli biex jiktbu.

1913
01:34:37,220 --> 01:34:39,500
Allura xi ħadd ħa l-ħin
u kiteb jQuery.

1914
01:34:39,500 --> 01:34:41,530
>> jQuery huwa attwalment miktub
fl JavaScript.

1915
01:34:41,530 --> 01:34:44,550
U allura għaliex ma dan, aħna issa
jkollhom mazz sħiħ ta 'funzjonijiet li

1916
01:34:44,550 --> 01:34:46,020
nistgħu nużaw li jagħmlu tagħna
jgħix verament faċli.

1917
01:34:46,020 --> 01:34:48,580

1918
01:34:48,580 --> 01:34:50,030
Allura dak li huma wħud mill-
affarijiet huwa ma?

1919
01:34:50,030 --> 01:34:51,650
Jagħmel għażla elementi aktar faċli.

1920
01:34:51,650 --> 01:34:54,020
Jagħmel jinbidlu HTML,
żżid klassijiet aktar faċli.

1921
01:34:54,020 --> 01:34:55,360
Jagħmel Ajax aktar faċli.

1922
01:34:55,360 --> 01:34:58,230
Aħna ser jiksbu għal dak fit-tieni.

1923
01:34:58,230 --> 01:35:00,630
>> U huwa analogu għall-libreriji Ċ.

1924
01:35:00,630 --> 01:35:03,090
Allura inti jinkludu string.h,
ikollok strlen.

1925
01:35:03,090 --> 01:35:04,680
Ikollok strcpy, kollha ta 'dawn l-affarijiet.

1926
01:35:04,680 --> 01:35:09,650
Meta inti jinkludu jQuery, ikollok sbieħ
modi biex tagħżel elementi għat-tibdil

1927
01:35:09,650 --> 01:35:10,390
affarijiet, eċċetera.

1928
01:35:10,390 --> 01:35:12,990
Ikollok funzjonalità żejda li
JavaScript ma jtik.

1929
01:35:12,990 --> 01:35:15,310
Allura jQuery mhix JavaScript.

1930
01:35:15,310 --> 01:35:18,660
jQuery librerija thats miktuba
JavaScript li jagħmel JavaScript

1931
01:35:18,660 --> 01:35:20,440
aktar faċli biex jiktbu.

1932
01:35:20,440 --> 01:35:23,170
>> Allura jQuery mhix programmazzjoni
lingwa.

1933
01:35:23,170 --> 01:35:24,540
Iżda JavaScript huwa.

1934
01:35:24,540 --> 01:35:27,420

1935
01:35:27,420 --> 01:35:27,590
jagħmlu.

1936
01:35:27,590 --> 01:35:30,420
Sure ikollok terminoloġija tiegħek dritt.

1937
01:35:30,420 --> 01:35:32,490
Kwalunkwe mistoqsijiet?

1938
01:35:32,490 --> 01:35:33,882
Iva.

1939
01:35:33,882 --> 01:35:35,132
Hija li kwistjoni?

1940
01:35:35,132 --> 01:35:37,910

1941
01:35:37,910 --> 01:35:38,350
Kull dritt.

1942
01:35:38,350 --> 01:35:40,080
Allura kif taħseb li tuża jQuery?

1943
01:35:40,080 --> 01:35:42,390
Ukoll, meta int bil-miktub xi
JavaScript kodiċi u inti jinkludu

1944
01:35:42,390 --> 01:35:45,570
jQuery fil-quċċata tal-fajl tiegħek bħala
fajl iskrittura, tuża s-sinjal dollaru

1945
01:35:45,570 --> 01:35:47,310
issa biex jiksbu aċċess għal jQuery.

1946
01:35:47,310 --> 01:35:49,860
U dan huwa differenti minn
is-sinjal dollaru fil-PHP.

1947
01:35:49,860 --> 01:35:51,590
>> Huwa l-istess simbolu inti
tip fuq it-tastiera tiegħek.

1948
01:35:51,590 --> 01:35:52,780
Imma jfissru affarijiet differenti ħafna.

1949
01:35:52,780 --> 01:35:56,090
Sinjal dollaru fil-PHP ifisser dan
huwa kif I tiddikjara varjabbli.

1950
01:35:56,090 --> 01:35:59,120
Fil JavaScript, meta inti stajt inklużi
jQuery, stands għall jQuery.

1951
01:35:59,120 --> 01:36:01,280
Sabiex iżommu dan f'moħħhom.

1952
01:36:01,280 --> 01:36:03,420
Allura kif tista aħna tagħżel elementi DOM?

1953
01:36:03,420 --> 01:36:06,500
Ukoll, meta inti tagħmel dan il-JavaScript ikrah
mod, inti aċċess għall-

1954
01:36:06,500 --> 01:36:08,240
dokument varjabbli globali.

1955
01:36:08,240 --> 01:36:11,170
U mbagħad ikollok element mill-familja ID.

1956
01:36:11,170 --> 01:36:15,270
Dan huwa verament twila u wordy
u mhux sbieħ ħafna.

1957
01:36:15,270 --> 01:36:18,190
>> Jew tista 'tikseb l-elementi kollha
li huma tag p.

1958
01:36:18,190 --> 01:36:20,080
Li taħdem wisq JavaScript.

1959
01:36:20,080 --> 01:36:22,470
Imma aħna qatt verament wera
inti s-sintassi wisq.

1960
01:36:22,470 --> 01:36:24,620
Dak li aħna wera inti kien jQuery.

1961
01:36:24,620 --> 01:36:28,720
Allura li selettur kollu up hemm li
ġiet espressa JavaScript biss gets

1962
01:36:28,720 --> 01:36:33,320
ikkondensat għal din dollaru sbieħ ħafna
jiffirmaw familja hashtag.

1963
01:36:33,320 --> 01:36:38,480
U $ p, biss fejn huwa bħal dik.

1964
01:36:38,480 --> 01:36:41,690
Jekk inti tixtieq li tagħżel tikketti kollha p
ġewwa familja, npoġġux spazju

1965
01:36:41,690 --> 01:36:42,890
bejn it-tnejn.

1966
01:36:42,890 --> 01:36:44,815
U issa, aħna jiksbu l-p
tags ġewwa familja.

1967
01:36:44,815 --> 01:36:48,740

1968
01:36:48,740 --> 01:36:50,380
>> U ħarsa familjari?

1969
01:36:50,380 --> 01:36:52,880
Well, Angela tkellmu dwar
Seletturi CSS.

1970
01:36:52,880 --> 01:36:54,200
Agħti me-tieni waħda.

1971
01:36:54,200 --> 01:36:57,230
U dan sabiex tagħżel element,
inti biss tuża l-istess ħaġa kif inti

1972
01:36:57,230 --> 01:36:58,530
se tagħmel ma 'selettur CSS.

1973
01:36:58,530 --> 01:37:00,910
Jekk inti tpoġġi hash quddiem
ta 'dan, huwa jagħżel minn ID.

1974
01:37:00,910 --> 01:37:02,220
A dot jagħżel il-klassijiet.

1975
01:37:02,220 --> 01:37:06,230
Jekk inti biss għandek il-ħaġa mingħajr
hashes jew tikek, huwa jagħżel dawk tags.

1976
01:37:06,230 --> 01:37:07,140
Mistoqsijiet.

1977
01:37:07,140 --> 01:37:07,470
Iva?

1978
01:37:07,470 --> 01:37:11,510
>> UDJENZA: Meta nużaw dot fil tagħna
HTML, huwa li mhux jQuery?

1979
01:37:11,510 --> 01:37:13,520
>> JOSEPH ONG: Dot fl HTML tagħna
hija ħaġa JavaScript.

1980
01:37:13,520 --> 01:37:14,750
Mhuwiex ħaġa jQuery.

1981
01:37:14,750 --> 01:37:17,620
Il-mod kif inti guys tgħallmu ma '
jQuery huwa l-użu. html.

1982
01:37:17,620 --> 01:37:21,510
U allura inti għadda kwalunkwe
l-HTML se tkun.

1983
01:37:21,510 --> 01:37:23,480
So I ser jiksbu għal dak fil biss
tieni attwalment.

1984
01:37:23,480 --> 01:37:27,800
Allura kif nistgħu nagħmlu Jittieħed element
ladarba aħna ħadthom magħżula dan?

1985
01:37:27,800 --> 01:37:30,130
Allura dak eżempju ta '
għażla ta 'element.

1986
01:37:30,130 --> 01:37:32,280
Allura issa, aħna tixtieq li tagħmel Jittieħed lilha.

1987
01:37:32,280 --> 01:37:35,730
>> Allura f'dan il-każ, let me jmorru lura
għall-slide ta 'qabel.

1988
01:37:35,730 --> 01:37:37,360
Kien Bob qabel.

1989
01:37:37,360 --> 01:37:40,660
U nixtieq li bidla li
ġewwa HTML biex Milo.

1990
01:37:40,660 --> 01:37:43,240
So I sejħa tal-funzjoni HTML
mill-element.

1991
01:37:43,240 --> 01:37:45,580
Dik il-funzjoni HTML huwa
metodu ta 'element.

1992
01:37:45,580 --> 01:37:47,430
U mbagħad I tagħtiha dak
Irrid li l-HTML li jkun.

1993
01:37:47,430 --> 01:37:50,560
U hija biss tissostitwixxi x'hemm ġewwa ta '
li tag bi kwalunkwe I tagħtiha.

1994
01:37:50,560 --> 01:37:50,830
Iva.

1995
01:37:50,830 --> 01:37:51,170
Mistoqsija?

1996
01:37:51,170 --> 01:37:57,397
>> UDJENZA: Il-hashtag hija użata
biss għall-jQuery.

1997
01:37:57,397 --> 01:37:59,313
[Inaudible]

1998
01:37:59,313 --> 01:38:01,230
aħna mhumiex se jużaw dan.

1999
01:38:01,230 --> 01:38:01,960
>> JOSEPH ONG: Yeah, eżattament.

2000
01:38:01,960 --> 01:38:03,750
Imma ma jinkwetaw wisq
JavaScript dwar pur.

2001
01:38:03,750 --> 01:38:06,670
I biss li inti guys biex jiffukaw dwar kif għandek
tagħmel dan ma jQuery, għaliex

2002
01:38:06,670 --> 01:38:10,020
li għaddej biex tkun l-importanti
parzjalment fuq il-kwizz.

2003
01:38:10,020 --> 01:38:10,400
Dritt.

2004
01:38:10,400 --> 01:38:10,880
Eżattament.

2005
01:38:10,880 --> 01:38:16,025
Allura inti tara li hashtag, b'tali mod li
jikkorrispondi biex tagħżel l-element ma

2006
01:38:16,025 --> 01:38:18,310
nofs ID minħabba li hashtag.

2007
01:38:18,310 --> 01:38:19,670
Hashtag ifisser ID.

2008
01:38:19,670 --> 01:38:22,870
U dan l-element għandu ID ta 'linji.

2009
01:38:22,870 --> 01:38:24,366
Allura dak l-element aħna tagħżel.

2010
01:38:24,366 --> 01:38:27,160
>> UDJENZA: [inaudible].

2011
01:38:27,160 --> 01:38:31,090
sinjal dollaru hashtag [inaudible]?

2012
01:38:31,090 --> 01:38:31,710
>> JOSEPH ONG: Allura l-ebda.

2013
01:38:31,710 --> 01:38:33,280
Il-kwistjoni hija tista 'tuża. Valur.

2014
01:38:33,280 --> 01:38:36,445
U. Valur biss xogħlijiet fuq elementi
li huma inputs.

2015
01:38:36,445 --> 01:38:40,950

2016
01:38:40,950 --> 01:38:45,495
Fil jQuery, ikun
. Val, mhux. Valur.

2017
01:38:45,495 --> 01:38:49,080
So I ser tingħata biex eżempju żgħir li
juri dan kollu flimkien

2018
01:38:49,080 --> 01:38:49,850
fit-tieni.

2019
01:38:49,850 --> 01:38:53,130
Imma naħseb dan iservi snippet ftit
jagħmel sens li n-nies s'issa.

2020
01:38:53,130 --> 01:38:55,450
Tixtieq li jibdlu l-HTML,
sejħa tal-metodu HTML.

2021
01:38:55,450 --> 01:38:56,432
Iva.

2022
01:38:56,432 --> 01:38:58,200
>> UDJENZA: Tista 'tispjega
il-metodu ġdid?

2023
01:38:58,200 --> 01:39:01,900
>> JOSEPH ONG: Allura metodu huwa biss
funzjoni li jappartjeni għal wieħed, f'dan il-

2024
01:39:01,900 --> 01:39:04,590
każ, waħda minn dawn l-elementi DOM,
għaliex inti tara I

2025
01:39:04,590 --> 01:39:05,940
magħżula l-element ewwel.

2026
01:39:05,940 --> 01:39:07,320
Attwalment, let me użu l-maws.

2027
01:39:07,320 --> 01:39:09,330
I magħżula element ewwel.

2028
01:39:09,330 --> 01:39:12,310
U mbagħad I sejjaħ din HTML
funzjoni li kellha.

2029
01:39:12,310 --> 01:39:15,710
U minħabba din il-funzjoni jappartjeni għal
dan il-ħaġa, aħna sejħa hija metodu.

2030
01:39:15,710 --> 01:39:19,480
Li jinsab biss isem fancy għal dan.

2031
01:39:19,480 --> 01:39:20,730
Jgħidu li għal darb'oħra.

2032
01:39:20,730 --> 01:39:22,880

2033
01:39:22,880 --> 01:39:25,170
Mela ftakar, aħna magħżula
l-element issa.

2034
01:39:25,170 --> 01:39:27,810
U konna poġġih ġewwa ta '
il-varjabbli element.

2035
01:39:27,810 --> 01:39:28,600
Tikkoreġi?

2036
01:39:28,600 --> 01:39:34,380
>> Allura meta aħna tixtieq li tibdel il HTML fuq
ġewwa, minħabba li kien Bob qabel, int

2037
01:39:34,380 --> 01:39:36,420
trid tibdel dak it-test għall Milo.

2038
01:39:36,420 --> 01:39:37,920
Allura aħna sejħa HTML.

2039
01:39:37,920 --> 01:39:41,610
U aħna għid liema l-HTML ġewwa
dak l-element għandu jkun issa.

2040
01:39:41,610 --> 01:39:44,107
U għalhekk bidliet li Milo,
minħabba I tatha Milo.

2041
01:39:44,107 --> 01:39:46,542
>> UDJENZA: Allura dawn qed jaħdmu flimkien.

2042
01:39:46,542 --> 01:39:47,030
[Inaudible]

2043
01:39:47,030 --> 01:39:47,390
>> JOSEPH ONG: Yeah, yeah.

2044
01:39:47,390 --> 01:39:48,180
Huma qed jaħdmu flimkien.

2045
01:39:48,180 --> 01:39:50,210
Allura wieħed minnhom jagħżel
l-element ewwel.

2046
01:39:50,210 --> 01:39:52,863
U t-tieni waħda ma
xi ħaġa li hija.

2047
01:39:52,863 --> 01:39:53,790
Iva.

2048
01:39:53,790 --> 01:39:56,168
>> UDJENZA: [inaudible].

2049
01:39:56,168 --> 01:40:01,280
Jekk dan il-metodu huwa differenti minn HTML
inti għandek l-metodu ugwali attwali.

2050
01:40:01,280 --> 01:40:01,560
>> JOSEPH ONG: Yeah.

2051
01:40:01,560 --> 01:40:03,370
Dan huwa metodu differenti.

2052
01:40:03,370 --> 01:40:04,670
Dan huwa metodu differenti.

2053
01:40:04,670 --> 01:40:07,860
U nistgħu tkopri li ftit tieni
meta nikbru għal eżempju.

2054
01:40:07,860 --> 01:40:12,000
I jixtiequ jagħmlu ċert li aħna tħaffef
għaliex aħna qed taħdem barra ta 'żmien.

2055
01:40:12,000 --> 01:40:15,360
Iżda aħna ħadthom run mod matul iż-żmien issa.

2056
01:40:15,360 --> 01:40:15,490
OK.

2057
01:40:15,490 --> 01:40:16,430
Kessaħ.

2058
01:40:16,430 --> 01:40:20,130
Mela jekk inti tixtieq iżżid klassi, hemm
wkoll metodu klassi add.

2059
01:40:20,130 --> 01:40:24,300
Dan huwa biss eżempju ta 'dak
inti tista 'tagħmel ma jQuery.

2060
01:40:24,300 --> 01:40:25,950
Li biss iżid klassi.

2061
01:40:25,950 --> 01:40:28,660
>> Jekk inti tixtieq li tneħħi dan,
inti tista 'sejħa neħħi.

2062
01:40:28,660 --> 01:40:32,280
Li jinsab biss ieħor ħaġa li tista 'tagħmel.

2063
01:40:32,280 --> 01:40:35,680
Allura iktar eżempji ta 'affarijiet li tista' tagħmel.

2064
01:40:35,680 --> 01:40:37,510
Allura nista 'biss jitqiegħed fuq
il-quċċata bħal dan?

2065
01:40:37,510 --> 01:40:38,760
Neħħi iżgħar.

2066
01:40:38,760 --> 01:40:42,470

2067
01:40:42,470 --> 01:40:45,930
Jekk I biss tesegwixxi dik JavaScript fuq
il-quċċata tal-fajl tiegħi, se li jaħdmu?

2068
01:40:45,930 --> 01:40:48,540

2069
01:40:48,540 --> 01:40:48,920
Dritt.

2070
01:40:48,920 --> 01:40:50,530
Minħabba nofs s'issa ma jeżistix.

2071
01:40:50,530 --> 01:40:51,840
Allura dan mhux sejjer jaħdem.

2072
01:40:51,840 --> 01:40:52,800
Tordna l-eżekuzzjoni.

2073
01:40:52,800 --> 01:40:55,040
Hija tmur għall-quċċata ewwel.

2074
01:40:55,040 --> 01:40:55,540
What?

2075
01:40:55,540 --> 01:40:57,450
>> UDJENZA: Liżgħar s'issa ma jeżistix?

2076
01:40:57,450 --> 01:40:57,810
>> JOSEPH ONG: Yeah.

2077
01:40:57,810 --> 01:40:58,710
Iżgħar ma jeżistux.

2078
01:40:58,710 --> 01:40:59,600
Eżattament.

2079
01:40:59,600 --> 01:41:01,320
>> UDJENZA: Inti qal nofs.

2080
01:41:01,320 --> 01:41:01,510
>> JOSEPH ONG: Jiddispjacini.

2081
01:41:01,510 --> 01:41:02,720
Iżgħar s'issa ma jeżistix.

2082
01:41:02,720 --> 01:41:04,510
U l-ħaġa hija I ma jkunux
inklużi l jQuery

2083
01:41:04,510 --> 01:41:06,580
fajl staqsi src iskrittura.

2084
01:41:06,580 --> 01:41:07,960
Allura li mhux sejjer jaħdem.

2085
01:41:07,960 --> 01:41:09,580
Actually, I ma tagħmel dan fil-
l-slide li jmiss, li

2086
01:41:09,580 --> 01:41:10,700
suppost li jiffissaw li jew.

2087
01:41:10,700 --> 01:41:14,120
Iżda l-mod kif nagħmlu dan huwa JavaScript
huwa avveniment misjuqa.

2088
01:41:14,120 --> 01:41:17,410
Allura dak li nagħmlu huwa nużaw avveniment
handler biex dan iseħħ.

2089
01:41:17,410 --> 01:41:19,510
U so I tagħżel id-dokument
stabbiliti ewwel.

2090
01:41:19,510 --> 01:41:23,810
I say, OK, meta d-dokument ikun
lest, let me run funzjoni.

2091
01:41:23,810 --> 01:41:25,470
Allura dak kollu li mezzi sintassi.

2092
01:41:25,470 --> 01:41:27,100
>> I magħżula id-dokument.

2093
01:41:27,100 --> 01:41:29,530
Issa, meta d-dokument ikun
lest, imexxu l-funzjoni.

2094
01:41:29,530 --> 01:41:32,970
U hekk hawn fuq meta d-dokument ikun
lest, li jfisser l-HTML għandha

2095
01:41:32,970 --> 01:41:36,140
mgħobbija, allura I run il-funzjoni
li jneħħi dak l-element.

2096
01:41:36,140 --> 01:41:40,270
U hekk issa, meta I run din il-funzjoni
li I għaddew fis lest, jien

2097
01:41:40,270 --> 01:41:43,780
garantit li l-HTML fuq il-
paġna se jeżistu ewwel.

2098
01:41:43,780 --> 01:41:44,100
Iva.

2099
01:41:44,100 --> 01:41:44,425
Mistoqsija?

2100
01:41:44,425 --> 01:41:48,200
>> UDJENZA: X'inhu l-avveniment keyword
fi ħdan il-funzjoni?

2101
01:41:48,200 --> 01:41:51,750
>> JOSEPH ONG: Allura dak l-avveniment keyword fil-
funzjoni huwa biss parametru li

2102
01:41:51,750 --> 01:41:53,490
gets mgħoddi għall-funzjoni
għal kwalunkwe avveniment.

2103
01:41:53,490 --> 01:41:55,470
Huwa biss xi ħaġa li
ikollok b'xejn.

2104
01:41:55,470 --> 01:41:59,320
Meta inti qed tuża handlers ewlenin
pset8, il-każ jista 'jgħidlek, għall-

2105
01:41:59,320 --> 01:42:01,350
eżempju, li ewlenin inti ippressat fuq.

2106
01:42:01,350 --> 01:42:05,540
F'dan il-każ, għal avveniment lesta,
huwa attwalment mhux super utli.

2107
01:42:05,540 --> 01:42:08,640
Iżda għal avveniment isfel ewlenin, huwa aktar
utli, għaliex ikollok biex tkun taf liema

2108
01:42:08,640 --> 01:42:12,330
ewlenin li għandek ippressat billi taċċessa prinċipali
kodiċi off dak l-avveniment oġġett.

2109
01:42:12,330 --> 01:42:13,530
Tikkoreġi?

2110
01:42:13,530 --> 01:42:15,160
Does li jagħmel sens?

2111
01:42:15,160 --> 01:42:16,280
OK.

2112
01:42:16,280 --> 01:42:16,580
Iva.

2113
01:42:16,580 --> 01:42:17,150
Mistoqsija?

2114
01:42:17,150 --> 01:42:19,290
>> UDJENZA: Allura tista 'tpoġġi l-
tag iskrittura aktar 'l isfel?

2115
01:42:19,290 --> 01:42:19,940
>> JOSEPH ONG: So yeah.

2116
01:42:19,940 --> 01:42:21,500
Inti tista 'tpoġġi l-iskrittura
tag aktar 'l isfel.

2117
01:42:21,500 --> 01:42:23,090
Iżda mbagħad hija biss isir verament messy.

2118
01:42:23,090 --> 01:42:26,590
U aħna nixtiequ li tiċċentralizza t
tal-kodiċi tagħna f'post wieħed.

2119
01:42:26,590 --> 01:42:28,290
U dan se jippermetti magħna biex jagħmlu dan.

2120
01:42:28,290 --> 01:42:32,010
Ftakar qabel I qal hemm nicer
mod li jiġi żgurat li l-elementi huma

2121
01:42:32,010 --> 01:42:33,880
fuq il-paġna qabel ma inti teżegwixxi kodiċi?

2122
01:42:33,880 --> 01:42:36,079
U dan huwa biss mod sabiħ
inti tlesti dan.

2123
01:42:36,079 --> 01:42:37,329
>> UDJENZA: [inaudible].

2124
01:42:37,329 --> 01:42:41,710

2125
01:42:41,710 --> 01:42:42,230
>> JOSEPH ONG: Yeah.

2126
01:42:42,230 --> 01:42:43,460
Inti xorta jkollhom, right?

2127
01:42:43,460 --> 01:42:46,930
Minħabba ftakar, inti inklużi l-
fajl fil-quċċata tal-paġna.

2128
01:42:46,930 --> 01:42:49,890
Allura li għaddej biex tesegwixxi l-ewwel qabel
inti tikseb l-qiegħ tal-paġna.

2129
01:42:49,890 --> 01:42:54,600

2130
01:42:54,600 --> 01:42:55,180
OK.

2131
01:42:55,180 --> 01:42:59,210
Allura inti tista 'wkoll żżid differenti
tip ta 'avveniment handler.

2132
01:42:59,210 --> 01:43:00,640
Dan wieħed biss proċessi klikks.

2133
01:43:00,640 --> 01:43:03,910
Meta I ikklikkja fuq iżgħar, imbagħad
se pop up ma 'twissija.

2134
01:43:03,910 --> 01:43:05,440
Dan huwa biss differenti
tip ta 'avveniment.

2135
01:43:05,440 --> 01:43:08,840
Kontrarjament għall-avveniment lesta, inti issa
jużaw l-avveniment ikklikkja meta inti tirċievi

2136
01:43:08,840 --> 01:43:10,190
clicks fuq element.

2137
01:43:10,190 --> 01:43:13,860
>> U hekk f'dan il-każ, ftakar, l-ikklikkja
handler huwa mehmuż ma 'iżgħar.

2138
01:43:13,860 --> 01:43:16,080
Allura dan jiġri biss meta
I ikklikkja fuq iżgħar.

2139
01:43:16,080 --> 01:43:19,510
U fl-ieħor, l-avveniment lesta
kien mehmuż mad-dokument.

2140
01:43:19,510 --> 01:43:23,750
Għalhekk jistenna għal-dokument
biex ikunu lesti.

2141
01:43:23,750 --> 01:43:25,120
Jagħmel sens?

2142
01:43:25,120 --> 01:43:26,190
I think I tista 'timxi fuq.

2143
01:43:26,190 --> 01:43:26,610
Iva.

2144
01:43:26,610 --> 01:43:26,980
Mistoqsija?

2145
01:43:26,980 --> 01:43:28,230
>> UDJENZA: [inaudible].

2146
01:43:28,230 --> 01:43:31,676

2147
01:43:31,676 --> 01:43:33,620
f'dan il-każ inti tuża [inaudible].

2148
01:43:33,620 --> 01:43:36,650
>> JOSEPH ONG: Oh, yeah, għaliex f'dan il-
każ, I jkollhom għalfejn jistennew l-iżgħar

2149
01:43:36,650 --> 01:43:40,740
element li jidhru fuq l-iskrin ewwel
qabel I tista 'tehmeż handler klikk li

2150
01:43:40,740 --> 01:43:43,062
dan, huwa għalhekk li jien poġġih ġewwa
ta 'dokument lesta.

2151
01:43:43,062 --> 01:43:45,780

2152
01:43:45,780 --> 01:43:46,840
OK.

2153
01:43:46,840 --> 01:43:52,390
U li jmiss, għalhekk dan huwa eżempju kbir ta '
kif inti jikkombinaw kollox.

2154
01:43:52,390 --> 01:43:55,930
Dan huwa biss eżempju forma validazzjoni
inti stajt tidher fil-lecture.

2155
01:43:55,930 --> 01:43:58,410
Allura teħodha pass pass kif
inti tmur permezz ta 'dan.

2156
01:43:58,410 --> 01:43:59,590
U se tkun totalment OK.

2157
01:43:59,590 --> 01:44:01,400
Just taqrah minn fuq għal isfel.

2158
01:44:01,400 --> 01:44:03,030
>> I jkollhom forma fil-qiegħ.

2159
01:44:03,030 --> 01:44:07,590
Meta d-dokument huwa lest, I tehmeż
tissottometti handler għall-forma, b'tali mod li

2160
01:44:07,590 --> 01:44:12,910
meta I jissottomettu l-formola, I nikseb il-valuri
ġewwa kull wieħed minn dawk l-inputs.

2161
01:44:12,910 --> 01:44:14,560
U jien tiċċekkja jekk huwa vojt.

2162
01:44:14,560 --> 01:44:17,090
Jekk huwa vojt, I-ritorn foloz, għaliex
Ma rridx li jissottomettu l-formola,

2163
01:44:17,090 --> 01:44:18,950
minħabba li l-formola hija żbaljata.

2164
01:44:18,950 --> 01:44:22,040
Jekk l-password huwa vojt jew huwa inqas
minn tmien karattri, I ma jissottomettux

2165
01:44:22,040 --> 01:44:24,470
il-forma, minħabba li wkoll żbaljat.

2166
01:44:24,470 --> 01:44:28,150
U l-foloz ritorn biss jipprevjeni
il-forma milli jissottomettu u

2167
01:44:28,150 --> 01:44:30,150
jmorru għal paġna ġdida.

2168
01:44:30,150 --> 01:44:31,310
>> U wieħed jittama, dan jagħmel sens.

2169
01:44:31,310 --> 01:44:34,650
I think inti guys għandhom walk permezz
dan il-pass kodiċi pass fuq tiegħek.

2170
01:44:34,650 --> 01:44:38,350
U ladarba inti tifhem dak l tagħżel
elementi u tagħmel Jittieħed lilha

2171
01:44:38,350 --> 01:44:40,520
fil-fatt jinvolvi, din se tagħmel
ħafna sens lilek.

2172
01:44:40,520 --> 01:44:41,295
Iva?

2173
01:44:41,295 --> 01:44:44,150
>> UDJENZA: X'tagħmel l-
isem = username jfisser?

2174
01:44:44,150 --> 01:44:48,530
>> JOSEPH ONG: Allura l-isem = username u
isem = password ifisser biss ħarsa lejn il-

2175
01:44:48,530 --> 01:44:50,730
attribut ta 'kwalunkwe
int tagħżel.

2176
01:44:50,730 --> 01:44:51,790
U mbagħad li għandha biex jaqblu.

2177
01:44:51,790 --> 01:44:53,870
Allura aħna jmorru fis reġistrazzjoni.

2178
01:44:53,870 --> 01:44:56,240
U allura aħna nħarsu lejn l-inputs kollha
u r-reġistrazzjoni.

2179
01:44:56,240 --> 01:44:59,990
U allura aħna pick-fejn l-isem wieħed
attribut huwa daqs username.

2180
01:44:59,990 --> 01:45:04,040
Hekk li l-ewwel selettur biss jagħżel
l-input username.

2181
01:45:04,040 --> 01:45:08,220
U li t-tieni selettur tagħżel biss
il-password wieħed, għaliex dawk ikollhom

2182
01:45:08,220 --> 01:45:12,240
attributi isem tagħhom stabbiliti bħala dak
dawn qed suppost tkun.

2183
01:45:12,240 --> 01:45:12,575
Mistoqsija?

2184
01:45:12,575 --> 01:45:17,030
>> UDJENZA: Meta tiġi sottomessa, kif ma 'l-
parti t'isfel isolvu l-parti ta 'fuq?

2185
01:45:17,030 --> 01:45:19,350
>> JOSEPH ONG: Allura dan għaliex
tal-handler avveniment.

2186
01:45:19,350 --> 01:45:23,000
Allura aħna qed jistennew għal tissottometti avveniment
li gets sparati mill-formola.

2187
01:45:23,000 --> 01:45:24,730
U li kollox li jissottomettu.

2188
01:45:24,730 --> 01:45:26,080
Why do I call jissottomettu up hemm?

2189
01:45:26,080 --> 01:45:28,870
Huwa jgħid, meta tiġi ppreżentata l-formola,
I jiksbu jissottomettu avveniment.

2190
01:45:28,870 --> 01:45:33,480
So let me biss jinterċettaw dan u
imbagħad run dan il-kodiċi minflok.

2191
01:45:33,480 --> 01:45:33,823
Iva?

2192
01:45:33,823 --> 01:45:35,866
>> UDJENZA: Għaliex għandek
li jkollhom avveniment funzjoni?

2193
01:45:35,866 --> 01:45:38,580
Għaliex ma tistax inti biss [inaudible]?

2194
01:45:38,580 --> 01:45:41,140
>> JOSEPH ONG: Minħabba fl JavaScript, inti
jkollha tiddikjara l-funzjonijiet.

2195
01:45:41,140 --> 01:45:42,910
Li jinsab biss kif taħdem
fl JavaScript.

2196
01:45:42,910 --> 01:45:44,800
Għandek tgħid li għaddej
jiddekorri funzjoni.

2197
01:45:44,800 --> 01:45:47,290
Allura int javżak li int
jistennew funzjoni hawn minflok

2198
01:45:47,290 --> 01:45:48,260
biss braces kaboċċi.

2199
01:45:48,260 --> 01:45:50,460
>> UDJENZA: U l-funzjoni
huwa x'ikun ġej?

2200
01:45:50,460 --> 01:45:50,650
>> JOSEPH ONG: Yeah.

2201
01:45:50,650 --> 01:45:52,790
Il-funzjoni hija tkun xi tkun ġewwa
l-braces kaboċċi wara

2202
01:45:52,790 --> 01:45:53,630
li keyword funzjoni.

2203
01:45:53,630 --> 01:45:54,045
Iva?

2204
01:45:54,045 --> 01:45:55,295
>> UDJENZA: [inaudible].

2205
01:45:55,295 --> 01:46:00,180

2206
01:46:00,180 --> 01:46:00,660
>> JOSEPH ONG: jissottomettu Għall?

2207
01:46:00,660 --> 01:46:03,520
>> UDJENZA: Le, għal funzjoni
mingħajr l-avveniment.

2208
01:46:03,520 --> 01:46:03,770
>> JOSEPH ONG: Yeah.

2209
01:46:03,770 --> 01:46:05,610
Allura mingħajr l-avveniment,
inti jista 'jkollhom dan.

2210
01:46:05,610 --> 01:46:08,480
Jekk inti m'għandekx bżonn l-avveniment,
allura inti tista 'sempliċement jħalli barra dan.

2211
01:46:08,480 --> 01:46:12,220
Imma jekk inti tagħmel, allura inti
biss jitqiegħed hemmhekk.

2212
01:46:12,220 --> 01:46:12,520
Iva.

2213
01:46:12,520 --> 01:46:13,190
Quick kwistjoni?

2214
01:46:13,190 --> 01:46:14,440
>> UDJENZA: [inaudible].

2215
01:46:14,440 --> 01:46:21,170

2216
01:46:21,170 --> 01:46:21,440
>> JOSEPH ONG: Yeah.

2217
01:46:21,440 --> 01:46:24,550
Għaliex dak li għandek bżonn tagħmel, il-
document.ready biss jgħid stenna għal kulħadd

2218
01:46:24,550 --> 01:46:26,540
l-HTML fuq il-paġna biex jgħabbi l-ewwel.

2219
01:46:26,540 --> 01:46:30,510
U normalment, inti tixtieq elementi tiegħek
fis-seħħ qabel inti tmexxi kull kodiċi.

2220
01:46:30,510 --> 01:46:31,030
Kull dritt.

2221
01:46:31,030 --> 01:46:32,180
Irridu jiksbu Ajax.

2222
01:46:32,180 --> 01:46:33,110
Aħna ma jkollhom ħafna ħin.

2223
01:46:33,110 --> 01:46:35,170
Allura vantaġġi u liżvantaġġi.

2224
01:46:35,170 --> 01:46:37,450
JavaScript huwa jipprova faċli
tikteb bil jQuery.

2225
01:46:37,450 --> 01:46:38,930
Iżda jQuery huwa tip ta kajman.

2226
01:46:38,930 --> 01:46:42,290
>> Huwa simili PHP hija aktar baxxa minn C,
għaliex dan huwa interpretat.

2227
01:46:42,290 --> 01:46:45,690
U jQuery huwa daqsxejn kajman minn
JavaScript, minħabba li ma lott ta '

2228
01:46:45,690 --> 01:46:46,630
affarijiet taħt il-barnuża.

2229
01:46:46,630 --> 01:46:48,660
U hekk jekk inti qed tuża jQuery, huwa
biss ftit kajman minn

2230
01:46:48,660 --> 01:46:51,630
JavaScript, anki jekk
jagħtik eleganti sbieħ.

2231
01:46:51,630 --> 01:46:53,970
U fl-aħħarnett, Ajax.

2232
01:46:53,970 --> 01:46:59,170
S'issa ma Ajax, inti ma bbenefikawx Ajax
f'termini ta 'pset7 għadhom, għaliex

2233
01:46:59,170 --> 01:47:01,150
meta inti tagħmel, inti tissottometti
formola li kwotazzjoni.

2234
01:47:01,150 --> 01:47:02,350
Tagħbijiet paġna ġdida.

2235
01:47:02,350 --> 01:47:04,440
Allura inti tikseb dan flash abjad big
fuq il-paġna filwaqt li

2236
01:47:04,440 --> 01:47:06,820
tagħbijiet tieni paġna, korretta?

2237
01:47:06,820 --> 01:47:08,780
>> Ikun tassew sbieħ jekk inti
ma kellhomx din flash.

2238
01:47:08,780 --> 01:47:11,600
Bħal Facebook, jekk inti biss iscroll biex
il-qiegħ, hija żżid kontenut ġdid

2239
01:47:11,600 --> 01:47:13,490
mingħajr iġjeniċi il-paġna kollu.

2240
01:47:13,490 --> 01:47:15,420
Allura xi ħaġa bħal din ikun sbieħ.

2241
01:47:15,420 --> 01:47:17,370
Dan huwa kodiċi JavaScript
fuq in-naħa tax-xellug.

2242
01:47:17,370 --> 01:47:19,390
Ikollok dak li hu ġewwa ta 'dak input.

2243
01:47:19,390 --> 01:47:21,340
Ikollok l-istokk info minn Yahoo!

2244
01:47:21,340 --> 01:47:27,440
U allura inti tagħmel string kbir li
jgħid, OK, dan huwa l-messaġġ li nixtieq

2245
01:47:27,440 --> 01:47:28,400
juru fuq l-iskrin.

2246
01:47:28,400 --> 01:47:32,280
U allura inti tpoġġi dak il-messaġġ ġewwa
ta 'xi element HTML li gets

2247
01:47:32,280 --> 01:47:33,970
murija fuq l-iskrin.

2248
01:47:33,970 --> 01:47:35,540
>> Allura dak kollu li qed jiġri hawn.

2249
01:47:35,540 --> 01:47:39,410
Allura bażikament, minħabba li din hija kollha
JavaScript u inti m'għandekx bżonn biex imexxu

2250
01:47:39,410 --> 01:47:42,980
aktar PHP, dan se tagħmel ċert
li l-paġna ma jġedded.

2251
01:47:42,980 --> 01:47:47,470
Allura dan huwa biss idea astratta
li jien qal hawn għal issa.

2252
01:47:47,470 --> 01:47:50,630
L-idea astratta hija li jekk inti tagħmel dan
kollha fl JavaScript, inti ma għandekx

2253
01:47:50,630 --> 01:47:52,330
jġedded il-paġna.

2254
01:47:52,330 --> 01:47:53,800
Imma kif taħseb fil-fatt jagħmlu dan?

2255
01:47:53,800 --> 01:47:56,230
>> Well, attwalment, ejja nitkellmu dwar
problema ma 'din l-ewwel.

2256
01:47:56,230 --> 01:47:59,340
A problema hija fl JavaScript,
eżekuzzjoni hija sinkroniku.

2257
01:47:59,340 --> 01:48:02,000
Allura inti għandek tistenna għal wieħed
linja biex jintemm qabel ma

2258
01:48:02,000 --> 01:48:03,370
tesegwixxi l-linja li jmiss.

2259
01:48:03,370 --> 01:48:06,130
U jekk dak jien ser fuq Yahoo!,
u servers tagħhom huma verament bil-mod, u

2260
01:48:06,130 --> 01:48:08,790
hija tieħu minnhom tliet sekondi biex
tagħti me back li info istokk?

2261
01:48:08,790 --> 01:48:12,620
Meta I hit li linja tal-prezzijiet, jekk il-
eżekuzzjoni hija sinkroniku, kif huwa bl-

2262
01:48:12,620 --> 01:48:15,390
Konvenzjonalment, liema huwa biss ser tagħmel hu li
browser tiegħek ser stall għal

2263
01:48:15,390 --> 01:48:15,930
tliet sekondi.

2264
01:48:15,930 --> 01:48:18,900
U int mhux ser ikunu jistgħu jagħmlu
xejn filwaqt li jiġrilha li data.

2265
01:48:18,900 --> 01:48:20,010
Li għaddej biex jiġu ffriżati.

2266
01:48:20,010 --> 01:48:20,800
>> U li bad.

2267
01:48:20,800 --> 01:48:23,390
Inti ma tridx lill-utent biex
jkollhom web page iffriżat.

2268
01:48:23,390 --> 01:48:24,170
Tikkoreġi?

2269
01:48:24,170 --> 01:48:25,480
Li jinsab biss bad.

2270
01:48:25,480 --> 01:48:26,770
Kulħadd jaqbel?

2271
01:48:26,770 --> 01:48:29,270
Jekk int browsing Facebook u
tiffriża u inti ma tistax tagħmel xejn, inti

2272
01:48:29,270 --> 01:48:31,920
jiksbu verament frustrati.

2273
01:48:31,920 --> 01:48:34,960
Sabiex is-soluzzjoni hija li nagħmlu xi ħaġa
mhux sinkroniku minflok.

2274
01:48:34,960 --> 01:48:38,910
Allura dan kollu ħaġa mhux sinkroniku jgħid
hija, jien ser jistaqsu din

2275
01:48:38,910 --> 01:48:40,280
URL għal xi data.

2276
01:48:40,280 --> 01:48:41,610
U allura jien ser jibqgħu għaddejjin.

2277
01:48:41,610 --> 01:48:45,330
Jien biss ser iżommu eżekuzzjoni
kwalunkwe kodiċi li kienet wara dik.

2278
01:48:45,330 --> 01:48:49,290
>> U mbagħad kull meta dik id-dejta hija lesta,
imbagħad I jipproċessaha.

2279
01:48:49,290 --> 01:48:50,540
Li kollox huwa qal.

2280
01:48:50,540 --> 01:48:52,795

2281
01:48:52,795 --> 01:48:56,710
>> UDJENZA: Ajax biss jagħmel
kodiċi mhux sinkroniku?

2282
01:48:56,710 --> 01:48:58,560
>> JOSEPH ONG: Huwa ta 'mhux sinkroniku
mod ta 'data fetching.

2283
01:48:58,560 --> 01:49:01,230
Allura l-ewwel ħaġa dwar Ajax
huwa tikri me tikseb data

2284
01:49:01,230 --> 01:49:03,170
minn websajt estern.

2285
01:49:03,170 --> 01:49:07,045
U t-tieni ħaġa hija li tagħmel ċert
dik il-paġna tiegħi ma stall filwaqt li jien

2286
01:49:07,045 --> 01:49:07,970
fetching li data.

2287
01:49:07,970 --> 01:49:09,600
Dik hija l-parti mhux sinkroniku ta 'dan.

2288
01:49:09,600 --> 01:49:13,040
Għaliex tmur off x'imkien ieħor,
minħabba I say I iżommu għaddejjin filwaqt li

2289
01:49:13,040 --> 01:49:14,900
huwa fetching li d-data, li
jagħmilha mhux sinkroniku.

2290
01:49:14,900 --> 01:49:17,170
I iżommu esekuzzjoni.

2291
01:49:17,170 --> 01:49:18,960
>> Sabiex iżommu dan mhux sinkroniku
idea f'moħħu.

2292
01:49:18,960 --> 01:49:22,010
U jien ser nuruk dak li
id-differenza hija.

2293
01:49:22,010 --> 01:49:23,920
Il-verżjoni sinkroniku
fuq in-naħa tax-xellug.

2294
01:49:23,920 --> 01:49:26,240
Il-verżjoni mhux sinkroniku
huwa fuq il-lemin.

2295
01:49:26,240 --> 01:49:29,170
Ħares lejn il-numri biex tara li
passi jikkorrispondu għal dak

2296
01:49:29,170 --> 01:49:30,610
tesegwixxi f'kull linja.

2297
01:49:30,610 --> 01:49:32,730
Hemmhekk, l-allert turi up ewwel.

2298
01:49:32,730 --> 01:49:34,590
Minħabba jkollna info istokk mill Yahoo!

2299
01:49:34,590 --> 01:49:37,250
jieħu tliet sekondi, tilari
għal tlett sekondi.

2300
01:49:37,250 --> 01:49:39,880
U allura allerti li l-prezz
wara dawk it-tliet sekondi.

2301
01:49:39,880 --> 01:49:43,690
>> Allura Issa, li juri twissija
up dak iż-żmien -

2302
01:49:43,690 --> 01:49:44,610
tliet sekondi pulzieri

2303
01:49:44,610 --> 01:49:47,670
U allura allerti minn wara dik.

2304
01:49:47,670 --> 01:49:48,930
Allura hija biss tmur pass pass.

2305
01:49:48,930 --> 01:49:51,200
Huwa simili dak li inti guys
jaċċettaw, korretta?

2306
01:49:51,200 --> 01:49:54,170
Bil-eżekuzzjoni mhux sinkroniku,
inti allert ewwel.

2307
01:49:54,170 --> 01:49:57,410
Imbagħad inti tmur off għal dan il-URL.

2308
01:49:57,410 --> 01:49:59,530
U inti tgħid, jien ser
staqsi għad-data.

2309
01:49:59,530 --> 01:50:01,170
U allura jien ser
proċess aktar tard.

2310
01:50:01,170 --> 01:50:04,230
Allura immedjatament tesegwixxi l-
linja li jmiss wara I jagħmlu dik

2311
01:50:04,230 --> 01:50:05,710
talba mhux sinkroniku.

2312
01:50:05,710 --> 01:50:08,920
>> Allura 0.001 sekondi, inti tara hi twissija.

2313
01:50:08,920 --> 01:50:10,960
Tesegwixxi dik il-funzjoni, bye allert.

2314
01:50:10,960 --> 01:50:14,240
U minħabba I għamel wegħda li I
se jipproċessaw id-data aktar tard, liema

2315
01:50:14,240 --> 01:50:17,920
jiġri huwa meta dik id-data taqa 'lura
tliet sekondi wara, allura I run li

2316
01:50:17,920 --> 01:50:21,380
funzjoni li għandi hemmhekk.

2317
01:50:21,380 --> 01:50:21,870
Iva?

2318
01:50:21,870 --> 01:50:25,750
>> UDJENZA: Tista 'tispeċifika jew
tiċċara dak Ajax jfisser?

2319
01:50:25,750 --> 01:50:30,460
>> JOSEPH ONG: Allura Ajax huwa mod li jekk I
bżonn data meta jien fuq websajt u I

2320
01:50:30,460 --> 01:50:34,690
Ma rridx li jġedded il-paġna, allura
I jużaw din it-teknoloġija msejħa Ajax.

2321
01:50:34,690 --> 01:50:40,630
Dan essenzjalment ifisser biss, imorru jġibu
data minn sit ieħor.

2322
01:50:40,630 --> 01:50:43,724
U tagħmel dan b'mod li biss
ma stall page web tiegħi.

2323
01:50:43,724 --> 01:50:46,650
>> UDJENZA: Allura huwa li inerenti
parti ta 'JavaScript jew jQuery?

2324
01:50:46,650 --> 01:50:50,590
>> JOSEPH ONG: Allura xi ħadd kiteb mod kif tagħmel
dan JavaScript żmien twil ilu.

2325
01:50:50,590 --> 01:50:52,050
Fil-punt wieħed, ma kinux jeżistu.

2326
01:50:52,050 --> 01:50:56,630
U hekk xi ħadd ivvintat din it-teknika
biex jippermetti persuni li jitolbu din id-data

2327
01:50:56,630 --> 01:50:57,680
b'dan il-mod.

2328
01:50:57,680 --> 01:50:59,550
U li kiteb xi għalf
biex tagħmel dan għalik.

2329
01:50:59,550 --> 01:51:01,605
U jQuery biss jagħtik dan
mod sabiħ ħafna biex jagħmlu dan

2330
01:51:01,605 --> 01:51:03,112
ma 'dan $. tikseb funzjoni.

2331
01:51:03,112 --> 01:51:07,200

2332
01:51:07,200 --> 01:51:09,480
mistoqsijiet?

2333
01:51:09,480 --> 01:51:11,560
I tista 'twieġeb mistoqsijiet dwar
Ajax afterward wisq.

2334
01:51:11,560 --> 01:51:13,870
I ser tkun hawn.

2335
01:51:13,870 --> 01:51:16,390
>> Għalhekk ejja us jġibu data mingħajr
iġjeniċi il-paġna.

2336
01:51:16,390 --> 01:51:18,200
U ejja nagħmlu dan fil-
b'mod asinkronu li

2337
01:51:18,200 --> 01:51:19,450
ma friża il-paġna.

2338
01:51:19,450 --> 01:51:22,680

2339
01:51:22,680 --> 01:51:27,310
Twil wisq, ma taqra jekk dik
Spjegazzjoni kien twil wisq għalik.

2340
01:51:27,310 --> 01:51:29,430
Allura finalment, cross-site
attakki scripting.

2341
01:51:29,430 --> 01:51:30,910
Rajna dan ma Zamyla.

2342
01:51:30,910 --> 01:51:34,285
Jekk xi ħadd database tiegħi għandha dan l-isem,
li huwa dan il-tikketta iskrittura, u I

2343
01:51:34,285 --> 01:51:38,280
jkollhom xi kodiċi fuq il-paġna tiegħi li prints
l-ismijiet tan-nies fil-filliera, jew għandi

2344
01:51:38,280 --> 01:51:43,310
xi kodiċi JavaScript li inserts
dan l-isem fil-paġna,

2345
01:51:43,310 --> 01:51:45,680
dak HTML gets prodotta?

2346
01:51:45,680 --> 01:51:47,290
Well, I jistampa l-tikketta HTML.

2347
01:51:47,290 --> 01:51:48,390
I jistampa dawn it-tags kollha.

2348
01:51:48,390 --> 01:51:50,740
>> I jiksbu l-parti fejn jien istampar
out mal-ħbieb tiegħi.

2349
01:51:50,740 --> 01:51:52,980
I jistampa Lauren out.

2350
01:51:52,980 --> 01:51:54,200
Hija jistampa Milo out.

2351
01:51:54,200 --> 01:51:56,810
U mbagħad isem tiegħi fid-database
huwa b'kitba post

2352
01:51:56,810 --> 01:51:58,060
istatus Facebook unflattering.

2353
01:51:58,060 --> 01:52:00,740

2354
01:52:00,740 --> 01:52:04,330
Minħabba I jiddaħħal dan fil-paġna
għaliex jidher qisu JavaScript, meta

2355
01:52:04,330 --> 01:52:07,930
din il-paġna gets mibgħuta lill-utent,
jiġrilha esegwiti bħala JavaScript.

2356
01:52:07,930 --> 01:52:10,800
U hekk dan huwa dak li nsejħu
attakk scripting cross-site.

2357
01:52:10,800 --> 01:52:14,570
Xi ħadd ipoġġi informazzjoni malizzjużi fil
database tiegħek li jistgħu jikkorrispondu għal

2358
01:52:14,570 --> 01:52:17,080
xi string addizzjonali jew
xi string JavaScript.

2359
01:52:17,080 --> 01:52:20,130
>> U meta jiġrilha stampata lill-
paġna b'dan il-mod, allura dak

2360
01:52:20,130 --> 01:52:22,580
jiġri huwa li kodiċi ħażin gets esegwiti
li jien ma riditx

2361
01:52:22,580 --> 01:52:25,110
għaliha biex tikseb esegwiti.

2362
01:52:25,110 --> 01:52:28,230
U li kollox lista ta 'sit cross
attakk scripting huwa.

2363
01:52:28,230 --> 01:52:31,790
U l-mod kif inti tikseb madwar
dan huwa simili Zamyla qal.

2364
01:52:31,790 --> 01:52:34,340
Inti biss wrap affarijiet
Chars speċjali HTML.

2365
01:52:34,340 --> 01:52:39,460
U dan HTML Chars speċjali huwa PHP
funzjoni li se jipprevjeni dan it-tip

2366
01:52:39,460 --> 01:52:42,000
ta 'ħaġa jiġri lilek
jekk għandek malizzjuż

2367
01:52:42,000 --> 01:52:43,830
string tiegħek fid-database.

2368
01:52:43,830 --> 01:52:47,650
Huwa biss taħrab dan, b'tali mod li ma
nikseb interpretat bħala HTML.

2369
01:52:47,650 --> 01:52:50,960
Huwa jissostitwixxi l-parentesi ftit
ma 'dak li nsejħu l-entitajiet.

2370
01:52:50,960 --> 01:52:52,250
U aħna marru fuq dan lecture wisq.

2371
01:52:52,250 --> 01:52:55,800
So I think inti guys għandu jkollhom
ħakma tajba fuq dan.

2372
01:52:55,800 --> 01:52:57,420
Mistoqsijiet?

2373
01:52:57,420 --> 01:52:57,820
Iva.

2374
01:52:57,820 --> 01:53:00,860
>> UDJENZA: Allura kif kieku
il-[inaudible]?

2375
01:53:00,860 --> 01:53:01,555
>> JOSEPH ONG: Jgħidu li għal darb'oħra.

2376
01:53:01,555 --> 01:53:02,500
>> UDJENZA: Kif tista 'l-monitor -

2377
01:53:02,500 --> 01:53:02,860
>> JOSEPH ONG: Dritt.

2378
01:53:02,860 --> 01:53:06,080
Allura għandek xi ħaġa li tgħid, meta
I reġistru, it-tip fl-isem tiegħi.

2379
01:53:06,080 --> 01:53:09,390
I biss tip il-qasam, jien jisimni
stript Facebook post unflattering

2380
01:53:09,390 --> 01:53:11,570
istatus tag iskrittura qrib.

2381
01:53:11,570 --> 01:53:15,690
U li biss gets tqiegħed fil-
database, għaliex ma nistax ngħid xi ħadd

2382
01:53:15,690 --> 01:53:18,260
fid-dinja ma jkollux isem
bi vleġġa xellug fiha jew il-

2383
01:53:18,260 --> 01:53:19,036
iskrittura kelma fiha.

2384
01:53:19,036 --> 01:53:21,330
Dan ma verament jagħmel sens.

2385
01:53:21,330 --> 01:53:24,560
So I biss għandhom jagħmlu ċert li I
sanitize l-għalf qabel I jistampaw

2386
01:53:24,560 --> 01:53:25,420
biex il-paġna.

2387
01:53:25,420 --> 01:53:27,140
>> UDJENZA: Allura l-karti speċjali HTML
jimpedixxi l-tags iskrittura?

2388
01:53:27,140 --> 01:53:28,710
>> JOSEPH ONG: Yeah.

2389
01:53:28,710 --> 01:53:29,960
Allura ma timpedixxix l-tags iskrittura.

2390
01:53:29,960 --> 01:53:32,320
Hija biss jagħmel ċert li l-
tags iskrittura ma jsibux

2391
01:53:32,320 --> 01:53:35,120
interpretat bħala HTML jew -

2392
01:53:35,120 --> 01:53:35,400
yeah.

2393
01:53:35,400 --> 01:53:38,470
Hija biss taqa up bħala dak li
fil-fatt hu.

2394
01:53:38,470 --> 01:53:39,220
Kull dritt.

2395
01:53:39,220 --> 01:53:40,930
Allura li kien ir-reviżjoni kwizz.

2396
01:53:40,930 --> 01:53:41,830
Kessaħ.

2397
01:53:41,830 --> 01:53:45,088
>> [Applause]