1
00:00:00,000 --> 00:00:02,964

2
00:00:02,964 --> 00:00:05,434
>> [Daqq ta mużika]

3
00:00:05,434 --> 00:00:11,825

4
00:00:11,825 --> 00:00:12,700
HANNAH: Hi, kulħadd.

5
00:00:12,700 --> 00:00:15,866
Grazzi guys tant għall ġejjin out
fit-temp disgusting għall-kwizz wieħed

6
00:00:15,866 --> 00:00:16,910
tirrevedi sessjoni.

7
00:00:16,910 --> 00:00:20,020
Kif inti guys taf, kwizz
wieħed huwa dan l-Erbgħa.

8
00:00:20,020 --> 00:00:22,209
Allura aħna qed tmur biex jmorru
permezz ta 'mazz ta' suġġetti.

9
00:00:22,209 --> 00:00:24,000
Davin: Ħej, nista 'ngħid
xi ħaġa reali malajr?

10
00:00:24,000 --> 00:00:25,215
HANNAH: Yeah, l Davin għaddej
ngħid xi ħaġa reali malajr.

11
00:00:25,215 --> 00:00:25,780
Davin: Jiddispjacini.

12
00:00:25,780 --> 00:00:29,490
Just reali malajr, jekk għandek mistoqsijiet
dwar l-kwizz, inti tista 'tmur online.

13
00:00:29,490 --> 00:00:32,420
Mur 2014 kwizz wieħed, dwar l-kwizz.

14
00:00:32,420 --> 00:00:34,680
Huwa ltqajna loġistika dwar
fejn imorru, meta tmur.

15
00:00:34,680 --> 00:00:38,100
Jekk int simultanjament iskritta, aħna qed
se jkollhom kwizz għamla fil 05:30.

16
00:00:38,100 --> 00:00:40,350
Jew jekk inti mibgħuta lili kwistjoni,
ikollok xi kwistjoni oħra.

17
00:00:40,350 --> 00:00:42,640
Iżda 05:30 hija l-make-up
ħin l-Erbgħa.

18
00:00:42,640 --> 00:00:44,540
Imma jekk ikollok aktar mistoqsijiet,
mistoqsijiet ġenerali,

19
00:00:44,540 --> 00:00:45,748
online għandha l-loġistika.

20
00:00:45,748 --> 00:00:47,690
Sabiex jiċċekkjaw hemm l-ewwel.

21
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>> HANNAH: biża.

22
00:00:49,070 --> 00:00:53,030
Allura hawnhekk-lista kbir ta 'suġġetti
li aħna qed tmur biex jgħaddu llum.

23
00:00:53,030 --> 00:00:57,390
Jien ser ikopru ta 'l-C
Jittieħed, li hija li l-ewwel kolonna.

24
00:00:57,390 --> 00:01:00,710
Allura l-għalf C li aħna
koperti wara kwizz żero.

25
00:01:00,710 --> 00:01:05,459
Nibdew ma 'lista marbuta,
li jinkludi pointers.

26
00:01:05,459 --> 00:01:07,668
>> Kull dritt, hekk aħna raw dan
fl-aħħar sessjoni reviżjoni,

27
00:01:07,668 --> 00:01:10,000
hekk jien ser jgħaddu
dan huwa ftit aktar malajr.

28
00:01:10,000 --> 00:01:13,500
Just jgħollu naħa tiegħek jekk inti trid lili biex
tnikkirx jew jindirizzaw xi ħaġa aktar.

29
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Iżda nużaw marbuta listi għaliex
bdejna fis-C ma 'arrays.

30
00:01:17,150 --> 00:01:20,920
U arrays huma kbar, iżda l-
problema hija jekk ikollha daqs fiss.

31
00:01:20,920 --> 00:01:24,925
Listi Marbuta inessu biex joħolqu
dinamikament daqs strutturi tad-dejta.

32
00:01:24,925 --> 00:01:28,520

33
00:01:28,520 --> 00:01:32,320
>> U aħna għandna l-operazzjonijiet bażiċi tagħna,
daħħal, tħassar, u tfittxija.

34
00:01:32,320 --> 00:01:36,780
U nistgħu nagħmlu daħħal fil
agħar każ 'żmien kostanti

35
00:01:36,780 --> 00:01:39,140
jekk aħna biss jitqiegħed fil-bidu nett.

36
00:01:39,140 --> 00:01:45,220
Iħassru u jfittxu, agħar
każ big oh ta 'żmien n.

37
00:01:45,220 --> 00:01:47,140
Għalhekk għal darb'oħra, just biex flip
permezz ta 'dawn l-istampi,

38
00:01:47,140 --> 00:01:50,860
Naf rajna dawn l-aħħar darba, imma aħna
tixtieq li jżommu rekord ta 'lista marbuta tagħna

39
00:01:50,860 --> 00:01:53,440
billi jżommu rekord tan-
kap tal-lista marbuta tagħna.

40
00:01:53,440 --> 00:01:55,580
Għaliex aħna nafu li
kull wieħed mill-għoqiedi tagħna

41
00:01:55,580 --> 00:01:58,610
huwa biss se punt li l-
node li jmiss fil-lista marbuta tagħna.

42
00:01:58,610 --> 00:02:00,460
>> Allura li l-mod kif aħna iżommu kont.

43
00:02:00,460 --> 00:02:02,910
Anke jekk dawn mhumiex
biċċiet kontinwi ta 'memorja,

44
00:02:02,910 --> 00:02:07,410
nistgħu jsibu lilhom bi ftit
wara l-vleġeġ differenti.

45
00:02:07,410 --> 00:02:09,800
Hawnhekk huwa struttura tagħna
għal node lista marbuta.

46
00:02:09,800 --> 00:02:11,440
Rajna dan l-aħħar darba.

47
00:02:11,440 --> 00:02:13,080
Għandna node Struct tagħna.

48
00:02:13,080 --> 00:02:14,340
U għandu żewġ proprjetajiet.

49
00:02:14,340 --> 00:02:17,020
Numru wieħed, l-attwali
valur irridu li jaħżen.

50
00:02:17,020 --> 00:02:18,290
F'dan il-każ, huwa integer.

51
00:02:18,290 --> 00:02:21,100
Dan jista 'jkun string, hija tista
jkun char, tkun xi tkun trid.

52
00:02:21,100 --> 00:02:24,710
U mbagħad, għandna biex iżommu kont ta '
l-node li jmiss fil-lista marbuta tagħna.

53
00:02:24,710 --> 00:02:29,797
Allura li għaddej biex tkun
pointer għall-node li jmiss.

54
00:02:29,797 --> 00:02:31,880
Jekk inti kienu biss tagħmel
tfittxija, bħal I said qabel,

55
00:02:31,880 --> 00:02:34,900
youd għandek issegwi vleġeġ tiegħek isfel.

56
00:02:34,900 --> 00:02:40,720
Inserzjoni, inti żżomm rekord
ta 'fejn il-bqija tal-lista tiegħek huwa.

57
00:02:40,720 --> 00:02:44,150
U inti tixtieq li idawwru-ras
għall-punt li element il-ġdid tagħna, li

58
00:02:44,150 --> 00:02:46,640
f'dan il-każ huwa wieħed,
u allura wieħed se punt

59
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għall-bqija tal-lista marbuta.

60
00:02:49,480 --> 00:02:52,996
Għalhekk għal darb'oħra, Naf li dan huwa xi ftit
daqsxejn ta 'repetizzjoni minn kwizz żero.

61
00:02:52,996 --> 00:02:55,370
Allura aħna għandhom ikunu attenti ħafna
dwar l-ordni li bih aħna

62
00:02:55,370 --> 00:03:00,390
tagħmel dawn pointings hekk aħna ma
jitilfu l-mogħdija ta 'l-dahar tal-lista.

63
00:03:00,390 --> 00:03:04,122
OK, xi mistoqsijiet bil
biss weħidhom listi marbuta?

64
00:03:04,122 --> 00:03:06,060
Tal-biża, OK, berred.

65
00:03:06,060 --> 00:03:09,410
>> Allura issa, aħna qed tmur biex jmorru fuq xi ħaġa
biss ftit aktar kumplikata,

66
00:03:09,410 --> 00:03:10,920
listi marbuta doppjament.

67
00:03:10,920 --> 00:03:13,680
Allura minbarra żamma
track tal-node li jmiss,

68
00:03:13,680 --> 00:03:16,220
aħna rridu wkoll li jżommu rekord
ta 'l-node preċedenti.

69
00:03:16,220 --> 00:03:19,580
U dan jippermetti li, jekk aħna qed
f'xi punt fil-lista marbuta tagħna,

70
00:03:19,580 --> 00:03:23,110
mhux biss imorru quddiem, iżda
wkoll jtenni lura.

71
00:03:23,110 --> 00:03:25,220
Għaliex kif rajna fil
lista marbuta weħidhom,

72
00:03:25,220 --> 00:03:27,980
jekk konna f'xi node, u
kollha f'daqqa, aħna iddeċieda,

73
00:03:27,980 --> 00:03:30,160
attwalment, Irrid immur għal
id-dritt node qabli,

74
00:03:30,160 --> 00:03:32,034
youd għandek tmur kollha
il-mod lura lill-kap

75
00:03:32,034 --> 00:03:35,710
u jtenni permezz sakemm Sibtha
l-node inti kienu qed ifittxu.

76
00:03:35,710 --> 00:03:37,680
>> Allura dan jagħmel l-affarijiet
kemmxejn aktar faċli kif aħna qed

77
00:03:37,680 --> 00:03:39,670
jippruvaw jtenni
permezz lista marbuta tagħna.

78
00:03:39,670 --> 00:03:47,870
Iżda teħtieġ magħna biex iżommu kont ta 'wieħed
aktar pointer, hekk wieħed aktar node stilla.

79
00:03:47,870 --> 00:03:50,830
Kull dritt, hekk hawn ġejja l-parti gost.

80
00:03:50,830 --> 00:03:55,600
Aħna qed tmur biex jipprattikaw il implimentazzjoni
neħħi għal listi marbuta doppjament.

81
00:03:55,600 --> 00:03:58,660
Allura din hija xi ħaġa li l-
logħba totalment ġust għall-kwizz.

82
00:03:58,660 --> 00:04:00,750
Hija wriet fuq kwiżż passat.

83
00:04:00,750 --> 00:04:04,220
Allura definittivament tkun ippreparata
għall-kodiċi ftit fil C.

84
00:04:04,220 --> 00:04:07,900
Tinsiex li b'dak kollu
dan gost PHP u JavaScript,

85
00:04:07,900 --> 00:04:10,560
aħna xorta jkollhom biex tiftakar
biex tagħmel C. Allura brush up fuq dik

86
00:04:10,560 --> 00:04:12,146
jekk int tħossok Rusty.

87
00:04:12,146 --> 00:04:14,580
>> Kull dritt, ejja ara jekk nistgħu nagħmlu dan.

88
00:04:14,580 --> 00:04:16,312
OK, berred.

89
00:04:16,312 --> 00:04:18,600
Allura aħna qed tmur biex tipprova
biex jeditjaw dritt hawn,

90
00:04:18,600 --> 00:04:20,707
u nisperaw li dan imur kif ippjanat.

91
00:04:20,707 --> 00:04:23,915
Kull dritt, ħadd ma jridu jagħtu me
suġġeriment dwar kif I għandha tibda?

92
00:04:23,915 --> 00:04:27,030
L-unika suppożizzjoni jien
teħid huwa li jien diġà

93
00:04:27,030 --> 00:04:30,180
jkunu struttura definita, il-
wieħed I wera fl-aħħar paġna,

94
00:04:30,180 --> 00:04:31,420
fl-aħħar slide.

95
00:04:31,420 --> 00:04:39,250
U jien ħażna tal-kap ta 'marbut my
lista f'xi pointer imsejħa lista.

96
00:04:39,250 --> 00:04:42,190
Ħadd ma rridu nġibu me beda?

97
00:04:42,190 --> 00:04:45,410
>> UDJENZA: Tista 'toħloq ġdid
node li jsejħu permezz tal-lista?

98
00:04:45,410 --> 00:04:46,410
>> HANNAH: biża, so
aħna qed tmur biex joħolqu

99
00:04:46,410 --> 00:04:47,951
node ġdid li jitkaxkru permezz tal-lista.

100
00:04:47,951 --> 00:04:48,570
I simili li.

101
00:04:48,570 --> 00:04:50,799
I ser biss sejħa hija pointer jekk dan huwa OK.

102
00:04:50,799 --> 00:04:52,340
U fejn għandhom oriġinarjament tibda?

103
00:04:52,340 --> 00:04:57,280

104
00:04:57,280 --> 00:04:59,840
>> UDJENZA: Probabbilment fi
il-kap tal-lista.

105
00:04:59,840 --> 00:05:00,590
HANNAH: Beautiful.

106
00:05:00,590 --> 00:05:03,670
Aħna rridu li tibda fil-ras, li
I said se jiġi maħżun fil-lista.

107
00:05:03,670 --> 00:05:04,170
Tal-biża.

108
00:05:04,170 --> 00:05:05,220
S'issa, hekk tajjeb.

109
00:05:05,220 --> 00:05:08,260
U issa, l-għan tagħna huwa li
jtenni permezz tal-lista

110
00:05:08,260 --> 00:05:12,870
sakemm insibu l-node ma
valur n li aħna tixtieq li tħassar.

111
00:05:12,870 --> 00:05:13,540
OK?

112
00:05:13,540 --> 00:05:15,910
>> Allura issa huwa l-parti fejn
irridu li jtenni permezz.

113
00:05:15,910 --> 00:05:19,488
Jista 'xi ħadd jissuġġerixxu
mod biex jtenni permezz?

114
00:05:19,488 --> 00:05:20,979
>> UDJENZA: A loop.

115
00:05:20,979 --> 00:05:21,840
>> HANNAH: A loop.

116
00:05:21,840 --> 00:05:22,620
I love it.

117
00:05:22,620 --> 00:05:25,550
Speċifikament, nistgħu nippruvaw loop waqt.

118
00:05:25,550 --> 00:05:30,919
OK, u aħna nafu li aħna ve laħaq
l-aħħar tal-lista tagħna meta dak?

119
00:05:30,919 --> 00:05:32,210
UDJENZA: Meta pointer huwa null.

120
00:05:32,210 --> 00:05:33,418
HANNAH: Meta pointer huwa null.

121
00:05:33,418 --> 00:05:34,320
Beautiful, I love it.

122
00:05:34,320 --> 00:05:35,110
OK, berred.

123
00:05:35,110 --> 00:05:39,300

124
00:05:39,300 --> 00:05:43,190
Allura sorry jekk Brace jgħaqqad tiegħi huwa
tip ta 'jaqgħu barra l-iskrin.

125
00:05:43,190 --> 00:05:44,090
Aħna miġjuba lura.

126
00:05:44,090 --> 00:05:46,610
OK, berred.

127
00:05:46,610 --> 00:05:48,690
X'hemm jmiss?

128
00:05:48,690 --> 00:05:51,950
>> Allura aħna nafu aħna tixtieq li tħassar
il node li għandu valur n.

129
00:05:51,950 --> 00:05:56,340
Mela ejja ssib il-każ fejn
aħna fil-fatt isibu node tagħna.

130
00:05:56,340 --> 00:05:57,840
Allura kif inkun tivverifika li?

131
00:05:57,840 --> 00:06:02,210
I d biss jgħidu jekk pointer, u mbagħad jekk jien
rridu nġibu l-valur out ta pointer,

132
00:06:02,210 --> 00:06:08,940
I biss ma vleġġa n,
ugwali n, il-parametru

133
00:06:08,940 --> 00:06:14,490
li aħna taw lil din il-funzjoni, il-
node li aħna rridu li attwalment tħassar.

134
00:06:14,490 --> 00:06:17,090
Kwalunkwe mistoqsijiet up sakemm here?

135
00:06:17,090 --> 00:06:18,360
Kull dritt.

136
00:06:18,360 --> 00:06:24,140
OK, hekk issa ejja tfassal stampa ta 'malajr
fuq il-bord biex Ħares dan.

137
00:06:24,140 --> 00:06:30,710
>> Mela ejja ngħidu hemm node sabiħ tagħna.

138
00:06:30,710 --> 00:06:34,480
U għandu valur, jien ser biss jgħidu erbgħa.

139
00:06:34,480 --> 00:06:40,340
U hija tosserva li l-li jmiss
node fil-lista marbuta tagħna.

140
00:06:40,340 --> 00:06:42,220
U hemm xejn quddiemha.

141
00:06:42,220 --> 00:06:45,800
Allura aħna għandna preċedenti tagħna
tipponta lejn xejn.

142
00:06:45,800 --> 00:06:48,110
F'dan il-każ, aħna punt lura.

143
00:06:48,110 --> 00:06:50,960
OK, just twaqqif tiegħi
marbuta lista hawn fuq.

144
00:06:50,960 --> 00:06:53,630
U għandna lista li l-punti
li din l-istruttura li tibda bil.

145
00:06:53,630 --> 00:06:57,220

146
00:06:57,220 --> 00:07:00,485
I ser tiġbed waħda aktar għal
raġunijiet ta 'kompletezza.

147
00:07:00,485 --> 00:07:04,209

148
00:07:04,209 --> 00:07:06,117
OK.

149
00:07:06,117 --> 00:07:07,480
I ser punt dan l quddiem.

150
00:07:07,480 --> 00:07:09,550
U jien ser jiġi li wieħed lura.

151
00:07:09,550 --> 00:07:10,360
Oops, sorry.

152
00:07:10,360 --> 00:07:12,710
Yeah, sibt dan lura.

153
00:07:12,710 --> 00:07:15,548

154
00:07:15,548 --> 00:07:16,967
Jagħmlu mill-ġdid.

155
00:07:16,967 --> 00:07:18,330
OK, hemm immorru.

156
00:07:18,330 --> 00:07:19,910
Kull dritt, ltqajna.

157
00:07:19,910 --> 00:07:21,780
OK, hawnhekk stampa tagħna.

158
00:07:21,780 --> 00:07:24,860
>> OK, hekk aħna tixtieq li jikkunsidraw żewġ każijiet.

159
00:07:24,860 --> 00:07:27,330
L-ewwel każ hija jekk l-
node irridu li tħassar

160
00:07:27,330 --> 00:07:29,420
huwa fil-bidu nett tal-lista tagħna.

161
00:07:29,420 --> 00:07:34,070
U mbagħad,-tieni każ li rridu
li hija tikkunsidra jekk huwa imkien ieħor.

162
00:07:34,070 --> 00:07:37,660
Nifhem li dan huwa totalment
messy tpinġija bil kollha tħassir tiegħi,

163
00:07:37,660 --> 00:07:40,400
iżda nisperaw aħna ser nippruvaw
dan ikun ċar b'xi kodiċi.

164
00:07:40,400 --> 00:07:45,450
>> OK, so ejja tkopri l-każ
fejn sibna node tagħna,

165
00:07:45,450 --> 00:07:48,900
u huwa fil-ħafna
bidu tal-lista marbuta tagħna.

166
00:07:48,900 --> 00:07:50,810
Xi ħadd jagħti me a
suġġeriment hawnhekk bħala dak

167
00:07:50,810 --> 00:07:54,684
I għandhom jagħmlu biex attwalment tneħħi node tagħna?

168
00:07:54,684 --> 00:07:55,970
Huwa ftit delikata.

169
00:07:55,970 --> 00:07:56,470
OK?

170
00:07:56,470 --> 00:07:59,628
>> UDJENZA: Inti għandek tieħu l-
node li jkun quddiemu

171
00:07:59,628 --> 00:08:01,794
u jagħmilha punt li l-
wieħed li jkun wara dan,

172
00:08:01,794 --> 00:08:03,004
u jieħdu l-node li
Ikun wara u tagħmel

173
00:08:03,004 --> 00:08:04,554
huwa punt li l-node quddiemu.

174
00:08:04,554 --> 00:08:05,220
HANNAH: Eżattament.

175
00:08:05,220 --> 00:08:10,640
OK, għalhekk dan huwa l-każ
where-- għandna żewġ każijiet.

176
00:08:10,640 --> 00:08:14,100
Għandna l-każ fejn il-
node li aħna qed tfittex

177
00:08:14,100 --> 00:08:18,270
hija l-quddiem tal-lista.

178
00:08:18,270 --> 00:08:23,110
OK, u mbagħad il-każ li inti
deskritti xort'oħra, right?

179
00:08:23,110 --> 00:08:24,500
Huwa x'imkien ieħor fil-lista.

180
00:08:24,500 --> 00:08:27,460

181
00:08:27,460 --> 00:08:32,840
Allura inti qal, għandna bżonn li
ħarsa lejn il-node ta 'qabel,

182
00:08:32,840 --> 00:08:36,500
u jagħmlu l-node preċedenti
punt li l-node li jmiss.

183
00:08:36,500 --> 00:08:40,510
Mela ejja ngħidu aħna qed
jippruvaw jieħdu out ħamsa

184
00:08:40,510 --> 00:08:43,059
fit-tpinġija ħafna messy tiegħi hawn fuq.

185
00:08:43,059 --> 00:08:47,530
Aħna rridu li tagħmel ċert li
erbgħa issa punti għal sitta.

186
00:08:47,530 --> 00:08:49,590
Erba tal-punti li jmiss sa sitt.

187
00:08:49,590 --> 00:08:52,150
U sitt l-punti preċedenti sa erba.

188
00:08:52,150 --> 00:08:53,960
C'est għan tagħna hawn, id-dritt?

189
00:08:53,960 --> 00:08:56,150
Dan huwa dak li naħseb li inti
biss qal hemmhekk.

190
00:08:56,150 --> 00:08:58,450
>> OK, so ejja nikseb dak l-ewwel biċċa.

191
00:08:58,450 --> 00:09:02,300
Ejja nagħmlu l jkollu l-
pointer preċedenti preċedenti.

192
00:09:02,300 --> 00:09:06,550

193
00:09:06,550 --> 00:09:09,690
Allura erba tal-li jmiss għandu jindika liema?

194
00:09:09,690 --> 00:09:13,210

195
00:09:13,210 --> 00:09:14,900
Eżattament, f'dan il-każ, sitta.

196
00:09:14,900 --> 00:09:18,470
Allura għandna ngħidu pointer, li jmiss.

197
00:09:18,470 --> 00:09:20,600
OK?

198
00:09:20,600 --> 00:09:21,150
Kull dritt.

199
00:09:21,150 --> 00:09:24,870
Mela ejja teħles minn din l-istampa ikrah
u jippruvaw biex tiġbed waħda kemmxejn nicer.

200
00:09:24,870 --> 00:09:29,040

201
00:09:29,040 --> 00:09:31,172
Għandna ras lista tagħna hawn.

202
00:09:31,172 --> 00:09:36,440

203
00:09:36,440 --> 00:09:42,740
U li jindika l-ewwel node fil
lista marbuta tagħna, li aħna qal hu erbgħa.

204
00:09:42,740 --> 00:09:45,620
Hawn tieni node tagħna, ħamsa.

205
00:09:45,620 --> 00:09:47,307
U t-tielet node tagħna, sitta.

206
00:09:47,307 --> 00:09:50,265
Just jippruvaw jiġbdu l-istess eżatt
stampa, biss ftit aktar nadif.

207
00:09:50,265 --> 00:09:52,780

208
00:09:52,780 --> 00:09:56,280
OK, so erba tal jmiss
oriġinarjament punti għal ħamsa.

209
00:09:56,280 --> 00:09:58,620
Ħames ta 'punti li jmiss sa sitt.

210
00:09:58,620 --> 00:10:00,170
Sitt ta 'punti preċedenti sa ħamest.

211
00:10:00,170 --> 00:10:02,470
U ħames tal-punti preċedenti sa erba.

212
00:10:02,470 --> 00:10:03,360
Allura ħafna nicer!

213
00:10:03,360 --> 00:10:04,530
OK, berred.

214
00:10:04,530 --> 00:10:07,770
>> Allura issa, dak li għamilna biss
hawn, din il-linja ta 'kodiċi,

215
00:10:07,770 --> 00:10:12,680
li jgħid pointer preċedenti
jmiss, hekk xi jfisser?

216
00:10:12,680 --> 00:10:17,540
Dan ifisser li jekk aħna qed tħares lejn
ħames, mur l-node ta 'qabel,

217
00:10:17,540 --> 00:10:21,970
u huwa li jmiss għandu issa
punt ħamsa tal-li jmiss.

218
00:10:21,970 --> 00:10:27,840
Allura essenzjalment, dak li qed jagħmel
huwa thats tħassir din vleġġa

219
00:10:27,840 --> 00:10:29,640
u jagħmilha skip dritt fuq ħamsa.

220
00:10:29,640 --> 00:10:31,360
Huwa li ċari?

221
00:10:31,360 --> 00:10:33,200
Naf li tista 'tkun daqsxejn ftit vaga.

222
00:10:33,200 --> 00:10:34,480
Nara xi nods ras.

223
00:10:34,480 --> 00:10:35,390
Li tajjeb.

224
00:10:35,390 --> 00:10:36,670
OK, berred.

225
00:10:36,670 --> 00:10:39,590
Issa, x'inhu l-pass li jmiss?

226
00:10:39,590 --> 00:10:42,060
>> Stajt reset li jmiss.

227
00:10:42,060 --> 00:10:45,297
Issa, li vleġġa oħra
do I bżonn għall-bidla?

228
00:10:45,297 --> 00:10:46,130
Dan wieħed dritt hawn.

229
00:10:46,130 --> 00:10:47,560
Sitta ta 'qabel.

230
00:10:47,560 --> 00:10:50,620
Aħna ma rridux sitt ta 'qabel
għall-punt li ħamsa jibqgħalu.

231
00:10:50,620 --> 00:10:54,580
Aħna rridu li għall-punt li erbgħa.

232
00:10:54,580 --> 00:10:56,190
Does li jagħmel sens stampa?

233
00:10:56,190 --> 00:10:58,370
Allura issa nistgħu attwalment jieħdu ħamsa out.

234
00:10:58,370 --> 00:10:59,370
Mela ejja nikseb dik il-biċċa.

235
00:10:59,370 --> 00:11:03,390

236
00:11:03,390 --> 00:11:11,180
X'għandi nagħmel qabel
reset sitta ta 'qabel biex erbgħa?

237
00:11:11,180 --> 00:11:14,360
Xi ideat hemmhekk?

238
00:11:14,360 --> 00:11:17,369
>> UDJENZA: Free l-node bejn
lilhom mill-iffissar li nulla?

239
00:11:17,369 --> 00:11:17,910
HANNAH: Kessaħ.

240
00:11:17,910 --> 00:11:21,100
Żgur, l-għan aħħari tagħna huwa
se tkun biex ħielsa l-node.

241
00:11:21,100 --> 00:11:22,490
Allura nistgħu nagħmlu dan id-dritt hawn.

242
00:11:22,490 --> 00:11:23,540
Free pointer.

243
00:11:23,540 --> 00:11:24,810
Assolutament.

244
00:11:24,810 --> 00:11:29,160
Iżda anke qabel dan,
ejja just-- dritt għan tagħna

245
00:11:29,160 --> 00:11:38,730
hawnhekk huwa li jiġi stabbilit pointer li jmiss
preċedenti ugwali għal pointer preċedenti.

246
00:11:38,730 --> 00:11:40,760
Naf li dan huwa jkollna koperti b'sa.

247
00:11:40,760 --> 00:11:45,440
OK, ejja take-- jibred.

248
00:11:45,440 --> 00:11:46,990
Jista kulħadd jara din il-linja tal-qiegħ?

249
00:11:46,990 --> 00:11:47,840
Jew hija super ċkejkna?

250
00:11:47,840 --> 00:11:50,430

251
00:11:50,430 --> 00:11:54,300
>> Allura qabel we tesegwixxi
din il-linja hawnhekk, irridu

252
00:11:54,300 --> 00:11:58,375
biex tiżgura li
pointer li jmiss ma huwiex null.

253
00:11:58,375 --> 00:12:00,500
Għaliex jekk pointer li jmiss huwa
null, liema tip ta 'żball

254
00:12:00,500 --> 00:12:02,727
se niġi meta nipprova
jagħmlu riferenza għal pointer null?

255
00:12:02,727 --> 00:12:03,560
UDJENZA: tort Seg.

256
00:12:03,560 --> 00:12:05,660
HANNAH: A tort seg, beautiful.

257
00:12:05,660 --> 00:12:09,690
OK, hekk jekk dan mhux
null, allura nistgħu reset.

258
00:12:09,690 --> 00:12:14,420
U aħna għandna sitta punt ġdid għal erbgħa.

259
00:12:14,420 --> 00:12:17,440
Mistoqsijiet sa dan il-punt?

260
00:12:17,440 --> 00:12:17,940
Iva?

261
00:12:17,940 --> 00:12:19,814
>> UDJENZA: Fl-ewwel tiegħek
jekk id-dikjarazzjoni, ma inti

262
00:12:19,814 --> 00:12:23,817
jfissru li jkollhom il-vleġġa
jmiss, jew [inaudible]?

263
00:12:23,817 --> 00:12:25,150
HANNAH: I fisser vleġġa pointer n.

264
00:12:25,150 --> 00:12:30,270
Allura bażikament, dak li jien tipprova tagħmel
huwa jgħidu, il-node attwali li jien

265
00:12:30,270 --> 00:12:34,100
mtennija fuq, il-node attwali li
Jien tħares lejn, jien ħażna fil pointer.

266
00:12:34,100 --> 00:12:37,630
U nixtieq li tkun taf li pointer
valur, li f'dan il-każ huwa n.

267
00:12:37,630 --> 00:12:39,500
U nixtieq li tara, huwa
l-node I infittex

268
00:12:39,500 --> 00:12:42,790
għall-node jien bil-għan li tħassar?

269
00:12:42,790 --> 00:12:47,657
Allura hu għalhekk li għandna hawnhekk pointer n.

270
00:12:47,657 --> 00:12:49,857
>> UDJENZA: Allura l-vleġġa għaddej
li n, int tkun qed tissettja l-valur

271
00:12:49,857 --> 00:12:52,058
u jaħżen fil node imsejħa n?

272
00:12:52,058 --> 00:12:55,410

273
00:12:55,410 --> 00:12:58,820
>> HANNAH: Allura huwa simili jekk I am
għaddejjin din il-lista marbuta

274
00:12:58,820 --> 00:13:00,310
u li tipponta lejn ħamsa.

275
00:13:00,310 --> 00:13:03,600
Jekk irrid nikseb dak il-valur, jekk
Irrid li tikseb dak in-numru, 5,

276
00:13:03,600 --> 00:13:06,400
I għandek tagħmel pointer vleġġa n.

277
00:13:06,400 --> 00:13:06,900
Kessaħ?

278
00:13:06,900 --> 00:13:07,900
Yeah.

279
00:13:07,900 --> 00:13:11,200
>> UDJENZA: Huwa n-isem tal-varjabbli?

280
00:13:11,200 --> 00:13:11,700
HANNAH: Iva.

281
00:13:11,700 --> 00:13:14,870
Allura jekk aħna flip lura wieħed
slide, n huwa l-isem

282
00:13:14,870 --> 00:13:18,660
tal-valur ġewwa tal-
node fil-lista marbuta tagħna.

283
00:13:18,660 --> 00:13:21,510
U naf li jistgħu jiksbu ftit
daqsxejn konfużjoni għaliex aħna wkoll

284
00:13:21,510 --> 00:13:24,680
qed jitolbu l-ħaġa
li aħna tixtieq li tħassar n.

285
00:13:24,680 --> 00:13:26,717
Allura dak fejn dik
linja waħda ġej minn.

286
00:13:26,717 --> 00:13:27,671
Yeah?

287
00:13:27,671 --> 00:13:31,010
>> UDJENZA: What do ikollok
[Inaudible] kif jaħdmu?

288
00:13:31,010 --> 00:13:33,872

289
00:13:33,872 --> 00:13:35,780
A pointer [inaudible]?

290
00:13:35,780 --> 00:13:37,520
>> HANNAH: Sure.

291
00:13:37,520 --> 00:13:40,027
Huma inti titkellem about-- liema linja?

292
00:13:40,027 --> 00:13:41,526
UDJENZA: L-aħħar linja [inaudible].

293
00:13:41,526 --> 00:13:44,280

294
00:13:44,280 --> 00:13:45,250
>> HANNAH: Sure, OK.

295
00:13:45,250 --> 00:13:48,540
Mela ejja nħarsu lejn l-istampa fl
Sabiex jippruvaw jispjegaw dan.

296
00:13:48,540 --> 00:13:51,030
Jien sorry, għall-
camera, il-kwistjoni kienet

297
00:13:51,030 --> 00:13:54,580
nistgħu jispjegaw pointer
vleġġa pointer li jmiss preċedenti.

298
00:13:54,580 --> 00:14:01,510
OK, so ejja ngħidu aħna qed fuq ħamsa
u l-għan tagħna huwa li tħassar ħamsa.

299
00:14:01,510 --> 00:14:07,240
Allura pointer li jmiss, liema minn dawn
tliet lymph ma li tagħtina?

300
00:14:07,240 --> 00:14:10,840
Din twassalna għad-sitt node, id-dritt?

301
00:14:10,840 --> 00:14:16,490
>> OK, hekk issa aħna qed tistaqsi
għall preëedenti sitt l.

302
00:14:16,490 --> 00:14:17,060
OK?

303
00:14:17,060 --> 00:14:20,210
U aħna qed jerġa 'jiġi issettjat dan
li huwa ugwali għal erbgħa,

304
00:14:20,210 --> 00:14:23,214
li ġara li tkun ħamsa tal-preċedenti.

305
00:14:23,214 --> 00:14:25,180
Naf, huwa super
diffiċli biex iżommu kont ta '.

306
00:14:25,180 --> 00:14:29,286
I really jirrakkomandaw li inti tiġbed ritratti
jekk ikollok xi mistoqsija bħal din.

307
00:14:29,286 --> 00:14:30,242
Iva?

308
00:14:30,242 --> 00:14:32,617
>> UDJENZA: Huwa l-raġuni li
aħna ma jkollhom [inaudible]?

309
00:14:32,617 --> 00:14:37,430

310
00:14:37,430 --> 00:14:38,570
>> HANNAH: Eżattament.

311
00:14:38,570 --> 00:14:44,800
Għalhekk il-kwistjoni kienet, għaliex do
aħna ma bżonn li jiċċekkja hawn?

312
00:14:44,800 --> 00:14:48,160
Għaliex ma we bżonn biex jivverifikaw li
pointer preċedenti mhux ugwali għal nulla?

313
00:14:48,160 --> 00:14:50,070
U huwa għaliex aħna ħadthom
diġà sseparati

314
00:14:50,070 --> 00:14:52,490
il-każ jekk il-pointer li
fil-bidu nett.

315
00:14:52,490 --> 00:14:54,060
Mistoqsija tajba ħafna.

316
00:14:54,060 --> 00:14:56,880
Xi ħaġa oħra fuq dan?

317
00:14:56,880 --> 00:14:57,380
OK, berred.

318
00:14:57,380 --> 00:14:58,360
Mela ejja jintemm dan up.

319
00:14:58,360 --> 00:14:59,890
Aħna kważi hemm.

320
00:14:59,890 --> 00:15:01,310
>> Allura dak jekk huwa l-kap?

321
00:15:01,310 --> 00:15:03,360
X'jiġri jekk minflok
tipprova tneħħi ħamsa,

322
00:15:03,360 --> 00:15:06,240
aħna fil-fatt ried iħassar erbgħa?

323
00:15:06,240 --> 00:15:07,270
X'għandu nagħmel?

324
00:15:07,270 --> 00:15:09,610
Well, nixtieq li reset my head għal dak?

325
00:15:09,610 --> 00:15:14,288

326
00:15:14,288 --> 00:15:15,585
Shout out?

327
00:15:15,585 --> 00:15:16,710
UDJENZA: Il-waħda wara.

328
00:15:16,710 --> 00:15:17,460
HANNAH: Beautiful.

329
00:15:17,460 --> 00:15:26,430
OK, hekk aħna tixtieq lista li għandha tiġi tipponta
għal dak kollu pointer node li jmiss tagħna huwa.

330
00:15:26,430 --> 00:15:29,040
Tajba.

331
00:15:29,040 --> 00:15:30,810
U biss għall-kompletezza tal-
sake, nixtiequ

332
00:15:30,810 --> 00:15:35,590
tixtieq li jiċċekkjaw li sakemm lista tagħna
ma huwiex null, sakemm lista tagħna mhix

333
00:15:35,590 --> 00:15:42,730
vojta, allura irridu nistabbilixxu
ugwali preċedenti tagħna biex null.

334
00:15:42,730 --> 00:15:46,960

335
00:15:46,960 --> 00:15:50,230
Mistoqsija s'issa?

336
00:15:50,230 --> 00:15:53,205
Pass wieħed bogħod from--?

337
00:15:53,205 --> 00:15:55,530
>> UDJENZA: Ikun jekk
lista mhix ugwali għal nulla?

338
00:15:55,530 --> 00:15:56,950
>> HANNAH: Iva, int totalment id-dritt.

339
00:15:56,950 --> 00:15:58,130
Jien hekk sorry.

340
00:15:58,130 --> 00:16:00,040
Hija lista mhix ugwali għal nulla.

341
00:16:00,040 --> 00:16:01,915
Tal-biża.

342
00:16:01,915 --> 00:16:04,245
Jippruvaw iġibu dan kollu fuq l-iskrin.

343
00:16:04,245 --> 00:16:06,870
Huwa tip ta 'waqgħat off.

344
00:16:06,870 --> 00:16:07,730
Jiddispjacini, guys.

345
00:16:07,730 --> 00:16:11,874
U fl-aħħar iżda mhux l-inqas, kollha
għandna nagħmlu hu ritorn.

346
00:16:11,874 --> 00:16:12,840
OK.

347
00:16:12,840 --> 00:16:15,400
Dan kien ħafna crammed
fil verament malajr.

348
00:16:15,400 --> 00:16:16,800
Tieħu t-tieni li tħares dan aktar.

349
00:16:16,800 --> 00:16:18,216
Għidli jekk għandek xi mistoqsijiet.

350
00:16:18,216 --> 00:16:20,232

351
00:16:20,232 --> 00:16:20,732
Yeah?

352
00:16:20,732 --> 00:16:26,940
>> UDJENZA: Jekk il-lista hija fil-
ras, then-- stenna, nevermind.

353
00:16:26,940 --> 00:16:27,700
>> HANNAH: OK, tajba.

354
00:16:27,700 --> 00:16:30,987
Allura dan huwa jekk il-lista tkun fir-ras,
aħna tneħħiha għal dak kollu li aħna mdaħħal.

355
00:16:30,987 --> 00:16:31,486
Yeah?

356
00:16:31,486 --> 00:16:33,777
>> UDJENZA: Tista jispjegaw
l-ewwel jekk istqarrija mill-ġdid?

357
00:16:33,777 --> 00:16:36,149
Jekk l-pointer li n hija ugwali għal n?

358
00:16:36,149 --> 00:16:36,690
HANNAH: Sure.

359
00:16:36,690 --> 00:16:42,780
Allura l-għan tagħna ta 'din il-funzjoni kollu huwa
li tħassar il-node li għandu valur n.

360
00:16:42,780 --> 00:16:47,460
Allura jekk insibu, kif aħna qed
mtennija permezz lista tagħna,

361
00:16:47,460 --> 00:16:51,770
il-node b'valur n, thats
l-waħda aħna tixtieq li tħassar.

362
00:16:51,770 --> 00:16:57,286
Allura kollha ta 'l tħassir jiġri
ġewwa ta 'dik kbir jekk id-dikjarazzjoni.

363
00:16:57,286 --> 00:16:58,593
Does li jagħmel sens?

364
00:16:58,593 --> 00:16:59,480
Kessaħ.

365
00:16:59,480 --> 00:16:59,990
Yeah?

366
00:16:59,990 --> 00:17:02,864
>> UDJENZA: Forsi inti biss ma tistax tara
dan, iżda ma għandek bżonn ukoll linja

367
00:17:02,864 --> 00:17:06,024
għall scrolling permezz tal-lista?

368
00:17:06,024 --> 00:17:06,690
HANNAH: biża.

369
00:17:06,690 --> 00:17:10,896
Ejja iġibu dan up ftit, u
aħna ser tarmi dak id-dritt fil-qiegħ.

370
00:17:10,896 --> 00:17:13,282

371
00:17:13,282 --> 00:17:15,490
Forsi l-bord ikun stajt
Kien idea ftit aħjar.

372
00:17:15,490 --> 00:17:17,829
Allura kif se nimxi pointer quddiem?

373
00:17:17,829 --> 00:17:20,184
>> UDJENZA: Pointer
ugwali pointer plus wieħed.

374
00:17:20,184 --> 00:17:21,599
>> HANNAH: Beautiful.

375
00:17:21,599 --> 00:17:25,050
Allura li jippermetti li
tkompli mtennija permezz.

376
00:17:25,050 --> 00:17:26,251
OK.

377
00:17:26,251 --> 00:17:27,750
UDJENZA: Would ma jkun hemm ieħor?

378
00:17:27,750 --> 00:17:29,028
HANNAH: Wieħed aktar ħin?

379
00:17:29,028 --> 00:17:32,444
UDJENZA: Would ma jkun hemm l-
l inkella wara l-big qodma jekk

380
00:17:32,444 --> 00:17:35,519
dikjarazzjoni [inaudible]?

381
00:17:35,519 --> 00:17:36,310
HANNAH: Liema parti?

382
00:17:36,310 --> 00:17:38,350
Jien sorry.

383
00:17:38,350 --> 00:17:41,800
>> UDJENZA: Il traversal,
m'għandux ikun hemm ieħor?

384
00:17:41,800 --> 00:17:43,550
HANNAH: You assolutament
jista 'jkollha ieħor.

385
00:17:43,550 --> 00:17:46,930
Minħabba I jkollhom id-dritt tar-ritorn
hemm, inti m'għandekx bżonn ieħor.

386
00:17:46,930 --> 00:17:48,760
Iżda yeah, mistoqsija tajba.

387
00:17:48,760 --> 00:17:50,170
OK, iva?

388
00:17:50,170 --> 00:17:52,878
UDJENZA: Nistgħu naħsbu ta pointer
li tkun miexja permezz tal-lista

389
00:17:52,878 --> 00:17:56,610
kif tieħu fuq il-valur
ta 'kull node fil-lista?

390
00:17:56,610 --> 00:18:00,650
Jew għandna naħsbu li bħala
tip ta 'estern mal-lista?

391
00:18:00,650 --> 00:18:02,350
>> HANNAH: Jew wieħed huwa multa, I think.

392
00:18:02,350 --> 00:18:05,880
Il-mod I jimmaġina li huwa
I say, OK, I am pointer.

393
00:18:05,880 --> 00:18:06,520
U dan huwa me.

394
00:18:06,520 --> 00:18:07,150
Dan huwa idejn tiegħi.

395
00:18:07,150 --> 00:18:09,960
Jien ser punt li l-differenti
affarijiet li nixtieq li jtenni permezz.

396
00:18:09,960 --> 00:18:12,270
L-ewwel nett, jien ser punt
lill-kap tal-lista.

397
00:18:12,270 --> 00:18:14,144
U li jgħidlekx me jien
ser punt għal erbgħa.

398
00:18:14,144 --> 00:18:18,060
U hekk me, huma esterni għal-lista,
I jistgħu punt għal kull wieħed minn dawn l-elementi.

399
00:18:18,060 --> 00:18:19,520
So I think ta nnifsi bħala pointer.

400
00:18:19,520 --> 00:18:21,645
UDJENZA: Allura meta inti tħassar
wieħed minn dawk l-elementi,

401
00:18:21,645 --> 00:18:23,404
inti tħassar lilek innifsek, biex ngħidu hekk.

402
00:18:23,404 --> 00:18:24,070
HANNAH: Eżattament.

403
00:18:24,070 --> 00:18:25,920
Allura inti tħassar l-ħaġa
int tipponta lejn.

404
00:18:25,920 --> 00:18:28,340
Għalhekk fl-eżempju li
rajna fejn aħna qed

405
00:18:28,340 --> 00:18:31,670
tipprova tneħħi ħamsa,
meta jien tipponta għal ħamsa,

406
00:18:31,670 --> 00:18:34,200
I tixtieq li tħassar il-
Ħaġa jien tipponta lejn.

407
00:18:34,200 --> 00:18:35,870
Eżattament id-dritt.

408
00:18:35,870 --> 00:18:36,577
Iva?

409
00:18:36,577 --> 00:18:39,410
UDJENZA: Have we tittieħed kura ta 'l-
F'każ fejn n hija mhux fil-lista?

410
00:18:39,410 --> 00:18:40,460
HANNAH: Jekk n ma tkunx fil-lista?

411
00:18:40,460 --> 00:18:43,501
Kollha li għaddej biex jiġri huwa int
ser jtenni permezz u jtenni

412
00:18:43,501 --> 00:18:47,616
permezz, u mbagħad, int ser
biex jiksbu pointer jkunu null,

413
00:18:47,616 --> 00:18:48,990
u allura int se jsir.

414
00:18:48,990 --> 00:18:50,812
>> UDJENZA: Allura do għandna
li jirritornaw xejn?

415
00:18:50,812 --> 00:18:51,520
HANNAH: Nistgħu.

416
00:18:51,520 --> 00:18:54,500
Il-mod li jekk definiti din
funzjoni, I biss jgħidu li dan jirritorna

417
00:18:54,500 --> 00:18:55,770
null indipendentement.

418
00:18:55,770 --> 00:18:58,360
Iżda int tista 'jkollhom xi ħaġa
bħal jirritornaw integer,

419
00:18:58,360 --> 00:19:00,920
u li hija r-ritorn
negattiv 1 jekk dan jonqos.

420
00:19:00,920 --> 00:19:03,070
Xi ħaġa bħal dik.

421
00:19:03,070 --> 00:19:04,494
Mistoqsijiet with-- iva?

422
00:19:04,494 --> 00:19:05,410
UDJENZA: [inaudible]?

423
00:19:05,410 --> 00:19:05,993
HANNAH: Jiddispjacini?

424
00:19:05,993 --> 00:19:07,419
UDJENZA: [inaudible]?

425
00:19:07,419 --> 00:19:07,960
HANNAH: Sure.

426
00:19:07,960 --> 00:19:11,730
Allura dak l-actual-- darba konna
għamlu dan ix-xogħol kollu ta 'ċaqliq

427
00:19:11,730 --> 00:19:16,530
dawn vleġeġ kollha madwar, kollu tagħna
għan kien li jeħles mill-node

428
00:19:16,530 --> 00:19:18,230
li aħna qed tfittex.

429
00:19:18,230 --> 00:19:21,610
Allura f'dan il-każ, ħelsien
pointer, jekk jien tipponta għal ħamsa,

430
00:19:21,610 --> 00:19:24,670
huwa simili tħassir dan node nofs.

431
00:19:24,670 --> 00:19:27,250
Dik hija l-parti pointer ħielsa.

432
00:19:27,250 --> 00:19:29,090
Li jagħmel sens?

433
00:19:29,090 --> 00:19:31,390
>> UDJENZA: Allura anke ħasbu
inti ma [inaudible]?

434
00:19:31,390 --> 00:19:36,060
>> HANNAH: Allura aħna jassumi fil-bidu
kellna xi lista li kienet already--

435
00:19:36,060 --> 00:19:37,220
huma kienu tpoġġi dan flimkien.

436
00:19:37,220 --> 00:19:39,761
Allura biex jinbena dan
lista, dawn ve [inaudible].

437
00:19:39,761 --> 00:19:42,190

438
00:19:42,190 --> 00:19:42,750
Kessaħ.

439
00:19:42,750 --> 00:19:44,490
Xi ħaġa oħra ma 'dan?

440
00:19:44,490 --> 00:19:46,386
Iva?

441
00:19:46,386 --> 00:19:49,204
>> UDJENZA: X'jiġri jekk il-lista
ma jkunx daqs is-linja null?

442
00:19:49,204 --> 00:19:49,704
[Inaudible]?

443
00:19:49,704 --> 00:19:52,289

444
00:19:52,289 --> 00:19:53,080
HANNAH: Dritt hawn?

445
00:19:53,080 --> 00:19:53,840
UDJENZA: Yeah.

446
00:19:53,840 --> 00:19:57,370
HANNAH: OK, kollha qed nagħmel
huwa Jien biss tagħmel ċert

447
00:19:57,370 --> 00:20:03,250
li qabel nipprova lista dereference,
qabel I tipprova l-aċċess ta 'qabel,

448
00:20:03,250 --> 00:20:07,210
Irrid nagħmel ċert li mhuwiex
null so I ma jsibux tort seg.

449
00:20:07,210 --> 00:20:08,400
Kessaħ.

450
00:20:08,400 --> 00:20:10,820
>> OK, I know dan kien pjuttost
ħafna li tinkiseb permezz.

451
00:20:10,820 --> 00:20:14,950
Allura dan slide se jkun
magħmula disponibbli lilek.

452
00:20:14,950 --> 00:20:17,341
Allura inti tista 'tmur permezz ta' dan f'aktar dettal.

453
00:20:17,341 --> 00:20:17,841
Iva?

454
00:20:17,841 --> 00:20:19,749
>> UDJENZA: Għaliex ma l-lista [inaudible]?

455
00:20:19,749 --> 00:20:24,129

456
00:20:24,129 --> 00:20:24,670
HANNAH: Sure.

457
00:20:24,670 --> 00:20:27,390
Allura lista verament punti li
dan l-element dritt hawn,

458
00:20:27,390 --> 00:20:29,200
l-ewwel element fil-lista.

459
00:20:29,200 --> 00:20:30,748
Għalhekk ma jistax ikollhom preċedenti.

460
00:20:30,748 --> 00:20:31,736
Iva?

461
00:20:31,736 --> 00:20:35,194
>> UDJENZA: Does il-punt pointer
l-istess indirizz fil-memorja?

462
00:20:35,194 --> 00:20:38,404
Ma punt li l-istess
indirizz fil-memorja bħala l-node

463
00:20:38,404 --> 00:20:40,640
li huwa tipponta lejn?

464
00:20:40,640 --> 00:20:43,865
>> HANNAH: Iva, hija tosserva
għal dan node fil-memorja.

465
00:20:43,865 --> 00:20:47,190
>> UDJENZA: Dritt, hekk
meta inti [inaudible]?

466
00:20:47,190 --> 00:20:50,580
>> HANNAH: F'ċertu sens, iva.

467
00:20:50,580 --> 00:20:51,280
OK.

468
00:20:51,280 --> 00:20:52,997
Kull dritt, ejja jimxu flimkien ma 'dan.

469
00:20:52,997 --> 00:20:55,330
U jekk ikollok aktar mistoqsijiet,
stick madwar fl-aħħar,

470
00:20:55,330 --> 00:20:57,130
u aħna tista 'tmur permezz-ġdid.

471
00:20:57,130 --> 00:20:58,120
OK, berred.

472
00:20:58,120 --> 00:21:00,490
Issa, we biex jimxu fuq
biex hash tabelli, tentattivi,

473
00:21:00,490 --> 00:21:04,940
u siġar, li inti ltqajna super
familjari magħhom speller p sett ħamsa,.

474
00:21:04,940 --> 00:21:11,020
>> Allura tabella hash huwa biss
array ma 'listi marbuta weħidhom

475
00:21:11,020 --> 00:21:14,050
jew listi li ġejjin off ta 'dan doppjament marbuta.

476
00:21:14,050 --> 00:21:16,380
Allura aħna għandna xi tip
ta 'firxa assoċjattiva.

477
00:21:16,380 --> 00:21:21,280
U kif nafu liema minn dawn
arrays bramel biex jsibu rwieħhom,

478
00:21:21,280 --> 00:21:24,137
nużaw funzjoni hash.

479
00:21:24,137 --> 00:21:26,470
Allura f'dan il-każ, jista 'xi ħadd
raden dak l-funzjoni hash

480
00:21:26,470 --> 00:21:28,636
tkun biss ibbażat fuq xi
tal-input u l-output?

481
00:21:28,636 --> 00:21:31,392

482
00:21:31,392 --> 00:21:33,194
>> UDJENZA: Numru Ittra ta 'l-alfabett.

483
00:21:33,194 --> 00:21:33,860
HANNAH: Eżattament.

484
00:21:33,860 --> 00:21:36,160
Hija biss jpoġġi lilhom fl-ordni alfabetika.

485
00:21:36,160 --> 00:21:39,280
Dak kollu li jibda bl-
A jitqiegħed fil-ewwel barmil.

486
00:21:39,280 --> 00:21:43,340
Kollox ma 'B jitqiegħed fil-
tieni barmil, fuq hekk, u ibqa 'sejjer.

487
00:21:43,340 --> 00:21:45,620
Tal-biża, OK.

488
00:21:45,620 --> 00:21:48,980
U funzjoni hash huwa kwalunkwe
funzjoni li jieħu fil-kelma

489
00:21:48,980 --> 00:21:51,910
u se jgħidlek x'għandek
barmil jappartjeni fil.

490
00:21:51,910 --> 00:21:55,150
Allura liema iskrizzjoni fil tagħna
firxa jappartjeni fil.

491
00:21:55,150 --> 00:21:58,080
>> Hekk kull darba I jagħtu tiegħi
hash jiffunzjonaw kelma,

492
00:21:58,080 --> 00:22:00,660
din għandha tell me l-istess
poġġi kull wieħed ħin.

493
00:22:00,660 --> 00:22:03,270
Allura jekk aħna tuża l-funzjoni hash
mill-slide preċedenti

494
00:22:03,270 --> 00:22:05,950
fejn aħna qed issortjar mill-
ewwel ittra tal-alfabett,

495
00:22:05,950 --> 00:22:08,230
kull darba I jagħtu tiegħi
funzjoni hash "tuffieħ,"

496
00:22:08,230 --> 00:22:10,180
hija għandha dejjem tagħti me back 0.

497
00:22:10,180 --> 00:22:12,890
Mela jekk jien jkollhom tuffieħ
jitqiegħdu fit-tabella hash tiegħi,

498
00:22:12,890 --> 00:22:17,700
jekk I jagħti "apple" għall-funzjoni hash tiegħi,
dan għandu jingħad, mur poġġih fil-barmil 0.

499
00:22:17,700 --> 00:22:19,980
Jekk jien tfittex għal
tuffieħ fit-tabella hash tiegħi

500
00:22:19,980 --> 00:22:24,340
u jien ngħid, fejn jista 'tuffieħ
ħajjin, inti ssaqsi funzjoni hash tiegħek.

501
00:22:24,340 --> 00:22:26,900
U jgħid, mur barmil 0.

502
00:22:26,900 --> 00:22:29,150
Kull dritt?

503
00:22:29,150 --> 00:22:32,660
Mistoqsijiet b'funzjonijiet hash?

504
00:22:32,660 --> 00:22:34,570
Tal-biża.

505
00:22:34,570 --> 00:22:37,320
>> Hawnhekk huwa ftit aktar
spjegazzjoni dettaljata

506
00:22:37,320 --> 00:22:39,570
ta 'dak funzjoni hash jista' dehra.

507
00:22:39,570 --> 00:22:42,230

508
00:22:42,230 --> 00:22:42,960
Kull dritt.

509
00:22:42,960 --> 00:22:45,960
Issa, il-problema ma hash
funzjonijiet hija f'dinja ideali,

510
00:22:45,960 --> 00:22:48,870
rridu naraw wieħed biss
Ħaġa f'kull barmil.

511
00:22:48,870 --> 00:22:50,900
Iżda fir-realtà, hemm
mhux biss kelma waħda

512
00:22:50,900 --> 00:22:54,280
li tibda bi A. Hemm ma
wieħed biss kelma li tibda bi B. Allura

513
00:22:54,280 --> 00:22:56,960
f'dan il-każ, jekk aħna
f'daqqa jiksbu "berry,"

514
00:22:56,960 --> 00:22:58,710
u aħna tixtieq li tqiegħed lilha
fis-mejda hash tagħna,

515
00:22:58,710 --> 00:23:03,640
u naraw, oh, no, banana hija
diġà hemm, dak li aħna gonna do?

516
00:23:03,640 --> 00:23:05,900
>> Well, aħna għandna żewġ għażliet.

517
00:23:05,900 --> 00:23:07,990
L-ewwel għażla hija
lineari probing, li

518
00:23:07,990 --> 00:23:11,100
ifisser biss tmur issib
l-barmil vojta li jmiss.

519
00:23:11,100 --> 00:23:14,100
Mur isibu l-entrata firxa vojta li jmiss.

520
00:23:14,100 --> 00:23:15,750
U biss jitqiegħed "berry" hemmhekk.

521
00:23:15,750 --> 00:23:18,880
So I know huwa suppost
jmorru ma banana fil-barmil wieħed.

522
00:23:18,880 --> 00:23:22,155
Iżda biss poġġih fil-barmil tlieta,
minħabba barmil tlieta tkun vojta.

523
00:23:22,155 --> 00:23:24,806

524
00:23:24,806 --> 00:23:26,680
Għażla oħra hija probabbilment
dak li inti jimplimentaw

525
00:23:26,680 --> 00:23:29,220
fil tiegħek p-sett, fejn inti
kellhom chaining separata.

526
00:23:29,220 --> 00:23:33,990
Allura kull wieħed mill bramel tiegħek,
kull wieħed mill-elementi array tiegħek,

527
00:23:33,990 --> 00:23:38,410
mhux biss iżomm waħda kliem, imma attwalment
jkollha pointer għal lista ta 'kliem.

528
00:23:38,410 --> 00:23:41,880
Allura li jekk kellek
banana fit-tabella hash tiegħek

529
00:23:41,880 --> 00:23:44,740
u int f'daqqa waħda riedu
li jżidu berry, l-ebda problema.

530
00:23:44,740 --> 00:23:51,110
Just żid berry fuq l-aħħar, jew biex
il-bidu, tal-lista marbuta tiegħek.

531
00:23:51,110 --> 00:23:54,040
OK, biża.

532
00:23:54,040 --> 00:23:58,490
Mistoqsijiet bil hash
tabelli qabel we go fuq?

533
00:23:58,490 --> 00:23:59,850
>> Kull dritt.

534
00:23:59,850 --> 00:24:01,070
Siġar u jipprova.

535
00:24:01,070 --> 00:24:07,980
OK, u għalhekk din kienet għażla oħra
għall-implimentazzjoni dizzjunarju.

536
00:24:07,980 --> 00:24:09,100
Inti tista għamlu jipprova.

537
00:24:09,100 --> 00:24:13,420
Allura huwa tip speċjali ta 'siġra li
iġib ruħu tabella hash multi-livell.

538
00:24:13,420 --> 00:24:16,862
Allura inti ser tara l-istampa
fejn inti għandek firxa li

539
00:24:16,862 --> 00:24:19,320
punti li mazz ta 'arrays
li jippuntaw lejn mazz ta 'arrays

540
00:24:19,320 --> 00:24:20,390
li jippuntaw lejn mazz ta 'arrays.

541
00:24:20,390 --> 00:24:23,140
U aħna ser tara eżattament dak li
look like fuq slide futur.

542
00:24:23,140 --> 00:24:26,070
U b'mod aktar ġenerali, siġra
huwa biss kull struttura tad-data

543
00:24:26,070 --> 00:24:29,710
li fiha d-data hija
organizzat f'xi ġerarkija.

544
00:24:29,710 --> 00:24:32,610
Għalhekk, fejn rajna għandna
xi tip ta 'fehim

545
00:24:32,610 --> 00:24:36,130
ta 'l-ogħla livell, livell li jmiss,
livell li jmiss, livell li jmiss.

546
00:24:36,130 --> 00:24:39,690
Allura dan huwa probabbilment l-aktar ċara
ma 'xi eżempji speċifiċi.

547
00:24:39,690 --> 00:24:40,880
Allura hawnhekk siġra tagħna.

548
00:24:40,880 --> 00:24:42,970
Tista 'tara li huwa
għandha livelli partikolari

549
00:24:42,970 --> 00:24:45,480
li nibdew ma 'dak node għerq, wieħed.

550
00:24:45,480 --> 00:24:47,640
U nistgħu jinżlu permezz siġra tagħna.

551
00:24:47,640 --> 00:24:50,730

552
00:24:50,730 --> 00:24:53,910
>> A siġra binarju huwa
tip partikolari ta 'siġra.

553
00:24:53,910 --> 00:24:56,770
U l-unika ispeċifikazzjoni
għal siġra binarju

554
00:24:56,770 --> 00:25:01,130
hija li kull node għandha
mhux iktar żewġ weraq.

555
00:25:01,130 --> 00:25:03,960
Allura inti ma tkunx qed tmur biex tara xi
ta 'dawn lymph jkollha tliet jew erba'

556
00:25:03,960 --> 00:25:06,880
jew xi numru ieħor ta 'weraq.

557
00:25:06,880 --> 00:25:11,310
U mbagħad saħansitra aktar speċifiċi
hija siġra tfittxija binarju

558
00:25:11,310 --> 00:25:18,010
fejn kull node għall-xellug tal-
node huwa se jkollu valur iżgħar.

559
00:25:18,010 --> 00:25:21,180
U kull valur għall-
dritt se tkun akbar.

560
00:25:21,180 --> 00:25:26,900
Mela jekk inti tara 44 huwa fil għerq tagħna,
lejn ix-xellug, 11, 22, u 33

561
00:25:26,900 --> 00:25:28,940
huma kollha inqas minn għerq tagħna.

562
00:25:28,940 --> 00:25:33,890
U fuq il-lemin huma kollha
numri bigger-- 66, 55, u 77.

563
00:25:33,890 --> 00:25:37,380
U din il-proprjetà jgħodd
f'kull livell tas-siġra.

564
00:25:37,380 --> 00:25:42,690
>> Allura meta aħna jinżlu għal
22, 11, u 33, għadu 11

565
00:25:42,690 --> 00:25:46,950
hija iżgħar minn 22 u
33 huwa akbar minn 22.

566
00:25:46,950 --> 00:25:50,160
U dan jagħmilha aktar faċli biex tfittxija
għaliex jekk aħna qed tfittex għal numru,

567
00:25:50,160 --> 00:25:53,877
nafu eżattament liema
fergħa li jsegwu l isfel.

568
00:25:53,877 --> 00:25:56,210
Allura dan għandu infakkarkom a
Ftit ftit ta 'tfittxija binarja.

569
00:25:56,210 --> 00:25:56,967
Yeah?

570
00:25:56,967 --> 00:25:58,835
>> UDJENZA: Allura meta int
jiddeskrivi binarju,

571
00:25:58,835 --> 00:26:00,587
inti qal hija jkollha għad-aktar żewġ weraq?

572
00:26:00,587 --> 00:26:01,170
HANNAH: Mm-hm.

573
00:26:01,170 --> 00:26:02,580
UDJENZA: Jista jkollhom inqas?

574
00:26:02,580 --> 00:26:03,121
HANNAH: Yeah.

575
00:26:03,121 --> 00:26:06,720
Mela ejja ngħidu, per eżempju, inti
ma kellux anke numru ta 'affarijiet

576
00:26:06,720 --> 00:26:11,791
u inti ma tista 'timla up tiegħek kollha
weraq, huwa multa jekk wieħed ikollu wieħed.

577
00:26:11,791 --> 00:26:12,290
OK?

578
00:26:12,290 --> 00:26:12,789
Tal-biża.

579
00:26:12,789 --> 00:26:15,930
Kwalunkwe mistoqsijiet oħra fuq is-siġar?

580
00:26:15,930 --> 00:26:16,670
OK.

581
00:26:16,670 --> 00:26:20,110
>> Lura għall jipprova tagħna kif I kien tkellem
dwar ftit qabel,

582
00:26:20,110 --> 00:26:23,900
kif għandna dawn arrays multi-livell.

583
00:26:23,900 --> 00:26:26,280
Allura f'dan il-każ, nibdew fil-quċċata.

584
00:26:26,280 --> 00:26:29,030
U nistgħu isegwu xi kelma mogħtija isfel.

585
00:26:29,030 --> 00:26:30,780
Mela ejja ngħidu ridna
biex tfittex Turing.

586
00:26:30,780 --> 00:26:34,380
Nibdew fi T, segwi l-isfel
għal firxa li fiha U,

587
00:26:34,380 --> 00:26:37,350
u jsegwu l-isfel sakemm aħna
jilħqu dan delta ftit li

588
00:26:37,350 --> 00:26:39,060
tgħidilna, iva, inti sibt kelma.

589
00:26:39,060 --> 00:26:43,200

590
00:26:43,200 --> 00:26:44,120
Ċara dwar jipprova?

591
00:26:44,120 --> 00:26:48,138
Xi ħaġa li jmorru hemmhekk?

592
00:26:48,138 --> 00:26:48,908
Iva?

593
00:26:48,908 --> 00:26:51,866
UDJENZA: Il-simbolu ta 'delta
għandek jokkupaw spazju fil-tipprova?

594
00:26:51,866 --> 00:26:54,532
HANNAH: Yeah, hekk li ma jkunx
neċessarjament anki ħtieġa li jkun delta.

595
00:26:54,532 --> 00:26:57,760
Iżda għandna bżonn xi mod biex
tell tagħna computer-- sorry,

596
00:26:57,760 --> 00:27:01,130
sabiex inkunu nafu li TUR mhijiex kelma.

597
00:27:01,130 --> 00:27:04,180
Minħabba ejja ngħidu aħna ma kellhiex
dan il-kunċett ta 'delta, dan il-kunċett

598
00:27:04,180 --> 00:27:09,850
ta congratulations, inti sabet kelma,
dan imur permezz u jtenni T U-R,

599
00:27:09,850 --> 00:27:11,300
u mbagħad jgħidu, biża, I sabuha!

600
00:27:11,300 --> 00:27:12,670
Għandu jkun kelma.

601
00:27:12,670 --> 00:27:13,720
Imma huwa verament mhux.

602
00:27:13,720 --> 00:27:15,310
Aħna rridu Turing kollu li jkun kelma.

603
00:27:15,310 --> 00:27:17,760
Allura aħna għandu jkollhom xi ħaġa fil-
aħħar li tgħid, congratulations,

604
00:27:17,760 --> 00:27:19,051
inti ħadthom misjuba kelma leġittimu.

605
00:27:19,051 --> 00:27:21,680
UDJENZA: Mela jekk kellek like
26 ittri fil-alfabett,

606
00:27:21,680 --> 00:27:24,560
kieku inti attwalment ikollhom
27 ċwievet jipprova tiegħek?

607
00:27:24,560 --> 00:27:26,010
>> HANNAH: biża, yeah.

608
00:27:26,010 --> 00:27:28,210
Allura fil-fatt, naħseb li
se tkun fuq il-pjastra jmiss.

609
00:27:28,210 --> 00:27:29,440
Ta 'da!

610
00:27:29,440 --> 00:27:32,880
Fejn jekk għandek
node fil jippruvaw tiegħek, int

611
00:27:32,880 --> 00:27:35,800
ser ikollhom 27-tfal minflok 26.

612
00:27:35,800 --> 00:27:39,010

613
00:27:39,010 --> 00:27:40,050
Kwalunkwe mistoqsijiet ma 'dak?

614
00:27:40,050 --> 00:27:40,550
Yeah?

615
00:27:40,550 --> 00:27:44,569
UDJENZA: Għaliex jipprova jieħu up so
ħafna spazju [inaudible] as you go?

616
00:27:44,569 --> 00:27:47,629
Għaliex huwa meqjus li jkun [inaudible]?

617
00:27:47,629 --> 00:27:48,170
HANNAH: Sure.

618
00:27:48,170 --> 00:27:48,790
Ejja ħa mmorru lura.

619
00:27:48,790 --> 00:27:52,350
Il-kwistjoni hija, għaliex
huma jipprova tant ikbar

620
00:27:52,350 --> 00:27:54,620
minn xi ħaġa bħal tabella hash.

621
00:27:54,620 --> 00:27:57,790
Allura għal kull waħda minn dawn il-livelli,
anki jekk dawn mhux qed tinġibed hawn,

622
00:27:57,790 --> 00:28:01,250
inti trid li jkollha 26-karattri kollha.

623
00:28:01,250 --> 00:28:04,420
U r-raġuni li inti ma tistax
jgħidu, oh, iżda bħal għal Turing, I

624
00:28:04,420 --> 00:28:07,570
m'għandhomx bżonn li jkollhom kwalunkwe minn dawk
istess affarijiet fuq il-livell ta 'U. Well,

625
00:28:07,570 --> 00:28:11,390
jekk f'daqqa waħda inti ried iżid
xi ħaġa li kien simili T-H,

626
00:28:11,390 --> 00:28:14,800
youd bżonn li jkollhom l-
kapaċità ta 'żżid din il-kelma.

627
00:28:14,800 --> 00:28:17,330
Allura għal kull ittra waħda,
int ser ikollhom

628
00:28:17,330 --> 00:28:19,730
li jkollhom mazz ta '
arrays ġejjin off ta 'dan.

629
00:28:19,730 --> 00:28:24,060
Allura inti tista 'tara kif d tikseb
verament kbir, verament mgħaġġel.

630
00:28:24,060 --> 00:28:26,560
Kwalunkwe mistoqsijiet oħra?

631
00:28:26,560 --> 00:28:28,980
Kull dritt.

632
00:28:28,980 --> 00:28:29,832
Yeah?

633
00:28:29,832 --> 00:28:33,210
>> UDJENZA: Meta huma jipprova
aktar mgħaġġla minn tabelli hash?

634
00:28:33,210 --> 00:28:36,280
>> HANNAH: Meta huma jipprova
aktar mgħaġġla minn tabelli hash?

635
00:28:36,280 --> 00:28:39,120
Mela jekk kellek verament
funzjoni hash bad.

636
00:28:39,120 --> 00:28:41,840
Mela ejja ngħidu I kien simili,
hawn funzjoni hash tiegħek.

637
00:28:41,840 --> 00:28:43,660
Ma jimpurtax liema kelma
inti tagħti me, jien dejjem

638
00:28:43,660 --> 00:28:47,740
ser poġġih fl-entrata firxa 0.

639
00:28:47,740 --> 00:28:52,000
U hekk aħna jispiċċaw ma biss it-tqegħid
kollox fil-lista wieħed big twila marbuta.

640
00:28:52,000 --> 00:28:58,740
U hekk żmien lookup se jieħu fl-agħar
n jekk huwa fl-aħħar nett tal-lista tagħna.

641
00:28:58,740 --> 00:29:03,150
Bl-jipprova, aħna biss għandhom jtenni
permezz tal-ittri fil-kelma.

642
00:29:03,150 --> 00:29:07,080
Għalhekk anki jekk aħna miżjud mazz
aktar kliem biex tipprova tagħna,

643
00:29:07,080 --> 00:29:09,620
ma kienx ser jieħu us kwalunkwe itwal
biex isibu kelma partikolari.

644
00:29:09,620 --> 00:29:11,750
>> Kollha għandna nagħmlu hu, per
Eżempju, f'dan il-każ,

645
00:29:11,750 --> 00:29:17,170
ejja ngħidu aħna qed tfittex għall-zoom,
aħna biss għandhom jtenni fuq

646
00:29:17,170 --> 00:29:19,840
Z-O-O-M, erba 'ittri.

647
00:29:19,840 --> 00:29:22,250
Allura dan huwa biss l-
tul tal-kelma zoom.

648
00:29:22,250 --> 00:29:25,400
Ma jimpurtax kif ħafna
aktar kliem npoġġux f'dan jipprova.

649
00:29:25,400 --> 00:29:30,225
Nistgħu dejjem ġġibu
f'dawk erba 'passi.

650
00:29:30,225 --> 00:29:31,215
Tal-biża.

651
00:29:31,215 --> 00:29:32,205
Iva?

652
00:29:32,205 --> 00:29:34,185
>> UDJENZA: Allura [inaudible]
huwa firxa, id-dritt?

653
00:29:34,185 --> 00:29:35,322
>> HANNAH: Mm-hm.

654
00:29:35,322 --> 00:29:37,155
UDJENZA: Jekk int
tfittex għall [inaudible],

655
00:29:37,155 --> 00:29:40,929
kieku inti jkollhom jgħaddu
firxa tiegħek biex issib [inaudible]?

656
00:29:40,929 --> 00:29:41,470
HANNAH: Sure.

657
00:29:41,470 --> 00:29:44,000
UDJENZA: Ma dak tieħu aktar żmien?

658
00:29:44,000 --> 00:29:46,370
HANNAH: Jekk jien ser
jgħidu li firxa tiegħi huwa dejjem

659
00:29:46,370 --> 00:29:49,250
se tkun A, B, Ċ, D,
E, F, G, blah blah blah,

660
00:29:49,250 --> 00:29:51,630
hekk jekk I dejjem taf huwa
fl-istess ordni eżatt,

661
00:29:51,630 --> 00:29:53,880
jekk I dejjem taf huwa
f'ordni alfabetiku,

662
00:29:53,880 --> 00:29:57,860
I tista 'biss jgħidu O huwa numru
hekk u hekk fil-alfabett.

663
00:29:57,860 --> 00:29:59,620
Just jaqbżu dak il-post.

664
00:29:59,620 --> 00:30:01,860
Minħabba ftakar, ma
arrays, nistgħu aċċess

665
00:30:01,860 --> 00:30:06,590
kwalunkwe element ta 'dik firxa fil kostanti
ħin jekk nafu fejn aħna qed tfittex.

666
00:30:06,590 --> 00:30:09,080

667
00:30:09,080 --> 00:30:09,580
Yeah?

668
00:30:09,580 --> 00:30:12,005
>> UDJENZA: Fuq il-preċedenti
slide [inaudible] 27,

669
00:30:12,005 --> 00:30:14,430
iżda 26 għall-ewwel waħda.

670
00:30:14,430 --> 00:30:15,400
>> HANNAH: Jiddispjacini?

671
00:30:15,400 --> 00:30:18,800
>> UDJENZA: Hux l-ewwel
wieħed 0, hekk ma kienx ikun 26?

672
00:30:18,800 --> 00:30:24,900
>> HANNAH: Sure, hekk meta aħna ngħidu 27, li l-
ser tagħtina indiċi 0 permezz 26.

673
00:30:24,900 --> 00:30:28,220
Imma jekk inti fil-fatt count
dawk barra, li għaddej biex tkun 27.

674
00:30:28,220 --> 00:30:30,007
Mistoqsija tajba.

675
00:30:30,007 --> 00:30:30,590
Xi ħaġa oħra?

676
00:30:30,590 --> 00:30:31,200
Yeah?

677
00:30:31,200 --> 00:30:34,420
>> UDJENZA: Allura huma jipprova
aktar kajman milli tabelli hash?

678
00:30:34,420 --> 00:30:37,920
>> HANNAH: Tries ser ikunu, fil
teorija, aktar mgħaġġla milli tabelli hash

679
00:30:37,920 --> 00:30:39,760
imma jieħdu up memorja aktar.

680
00:30:39,760 --> 00:30:40,534
Yeah?

681
00:30:40,534 --> 00:30:41,450
UDJENZA: [inaudible]?

682
00:30:41,450 --> 00:30:45,770

683
00:30:45,770 --> 00:30:47,484
>> HANNAH: Jien sorry, I ma tisma int.

684
00:30:47,484 --> 00:30:48,400
UDJENZA: [inaudible].

685
00:30:48,400 --> 00:30:51,250

686
00:30:51,250 --> 00:30:54,100
0-25 jagħtik 26.

687
00:30:54,100 --> 00:30:56,958
>> HANNAH: 0-25 kieku
jtik 26, id-dritt.

688
00:30:56,958 --> 00:30:58,457
>> UDJENZA: U mbagħad [inaudible].

689
00:30:58,457 --> 00:30:59,040
HANNAH: Dritt.

690
00:30:59,040 --> 00:31:04,760
Allura l-għadd aħna qed tispeċifika hi
in-numru ta 'affarijiet fil-firxa tagħna.

691
00:31:04,760 --> 00:31:07,260
Allura jekk ikollna 27, huwa
ser tagħtina 0

692
00:31:07,260 --> 00:31:10,620
permezz 26, li se tagħti
us kamra għal, f'dan il-każ,

693
00:31:10,620 --> 00:31:12,770
Jien ma tinkludix apostrophe.

694
00:31:12,770 --> 00:31:17,040
Allura aħna qed jkollna 0 permezz 25 huma
l-ewwel 26-ittri tal-alfabett,

695
00:31:17,040 --> 00:31:18,990
jew 26 ittri kollha ta 'l-alfabet.

696
00:31:18,990 --> 00:31:21,190
U allura li l-aħħar
Ħaġa, meta jidħol 26, huwa

697
00:31:21,190 --> 00:31:24,598
se tkun l-verifika
marka, jew il-delta.

698
00:31:24,598 --> 00:31:26,960
Xi ħaġa oħra?

699
00:31:26,960 --> 00:31:29,130
Tal-biża.

700
00:31:29,130 --> 00:31:30,020
Tlift ispazju tiegħi.

701
00:31:30,020 --> 00:31:31,020
OK, berred.

702
00:31:31,020 --> 00:31:33,240
>> Allura aħna diġà ssemma fuq dan.

703
00:31:33,240 --> 00:31:37,430
Iżda l-kummerċ big off
bejn pajjiżi u t-tabelli hash

704
00:31:37,430 --> 00:31:39,720
hija li tipprova tipprovdi, fl
teorija, ħarsa kostanti up

705
00:31:39,720 --> 00:31:42,890
drabi iżda jużaw lott kollu ta 'memorja.

706
00:31:42,890 --> 00:31:46,495
Kull dritt, issa għandna ftit
strutturi inqas ikkumplikati,

707
00:31:46,495 --> 00:31:49,640
u aħna ser jsir bi C,
u aħna ser jimxu id-dritt flimkien.

708
00:31:49,640 --> 00:31:51,930
>> Allura stacks, rajna dan
fil lecture fejn inti

709
00:31:51,930 --> 00:31:55,020
ikollhom xi ħaġa bħal
munzell ta 'dixxijiet fejn

710
00:31:55,020 --> 00:31:57,330
l-aħħar ħaġa inti tpoġġi
fuq il-munzell hu għaddej

711
00:31:57,330 --> 00:31:59,500
li tkun l-ewwel ħaġa li għandek tieħu off.

712
00:31:59,500 --> 00:32:02,880
Allura dak hu li verament jiddefinixxi munzell
huwa li l-aħħar ħaġa inti tpoġġi fuq

713
00:32:02,880 --> 00:32:06,080
se tkun l-ewwel
ħaġa li għandek tieħu off.

714
00:32:06,080 --> 00:32:09,279
U l-terminoloġija li nużaw
jekk aħna qed tmur biex xi ħaġa,

715
00:32:09,279 --> 00:32:12,070
jekk aħna qed tmur biex iżżid xi ħaġa li
munzell tagħna, nagħmlu sejħa dan imbuttar.

716
00:32:12,070 --> 00:32:14,970
U jekk nieħdu xi ħaġa
off, nagħmlu sejħa hija popping.

717
00:32:14,970 --> 00:32:17,080
U jekk aħna qed tmur biex
timplimenta munzell, aħna

718
00:32:17,080 --> 00:32:20,660
jeħtieġ li tkun żgur li żżomm rekord ta '
kemm id-daqs u l-kapaċità.

719
00:32:20,660 --> 00:32:24,940
Allura l-għadd totali ta 'elementi nistgħu
istiva u n-numru attwali ta 'elementi

720
00:32:24,940 --> 00:32:27,880
li aħna qed iżżomm.

721
00:32:27,880 --> 00:32:29,885
>> U l-istess ħafna, aħna għandna kjuwijiet.

722
00:32:29,885 --> 00:32:34,510
U l-unika differenza
huwa minflok mar stacks,

723
00:32:34,510 --> 00:32:37,630
għidna l-aħħar ħaġa li nitfgħu fuq
hija l-ewwel ħaġa li nieħdu off.

724
00:32:37,630 --> 00:32:40,940
Allura ma kjuwijiet, il-
ewwel ħaġa li għandna jitqiegħdu fil

725
00:32:40,940 --> 00:32:43,129
se tkun il-
ewwel ħaġa li nieħdu out.

726
00:32:43,129 --> 00:32:45,420
Allura dan huwa simili jekk int
attwalment lining up fil-maħżen

727
00:32:45,420 --> 00:32:48,140
u int qed għenu,
allura l-ewwel persuna fil-linja

728
00:32:48,140 --> 00:32:50,880
għandha tkun l-ewwel persuna li għandha tiġi megħjuna.

729
00:32:50,880 --> 00:32:52,220
Allura li tkun kju.

730
00:32:52,220 --> 00:32:55,880
>> Għalhekk għandna bżonn li jżommu rekord ta 'l-
daqs, kapaċità, u ras peress li aħna qed

731
00:32:55,880 --> 00:33:01,130
ser jieħdu kulħadd off-front
tal-lista minflok il-dahar.

732
00:33:01,130 --> 00:33:03,480
Mistoqsijiet dwar li?

733
00:33:03,480 --> 00:33:06,330
Kwalunkwe mistoqsijiet Ċ li huma bothering inti?

734
00:33:06,330 --> 00:33:09,590
Strutturi tad-dejta, xi li Jittieħed gost?

735
00:33:09,590 --> 00:33:10,530
Dritt Kollha, berred.

736
00:33:10,530 --> 00:33:14,120
So I ser jagħtih lill Alison biex
Mur fis xi programmazzjoni aktar.

737
00:33:14,120 --> 00:33:15,965
>> Alison: Oh, aħna ser tara.

738
00:33:15,965 --> 00:33:17,370
Aħna ser tara kif ukoll I do hawnhekk.

739
00:33:17,370 --> 00:33:21,410
OK, jien ser jippruvaw u jtajru
permezz ta dan il-għalf, guys.

740
00:33:21,410 --> 00:33:24,540
Hannah marru ħafna fl
fond dwar l-affarijiet kollha tagħha.

741
00:33:24,540 --> 00:33:26,900
Jien ser tipprova tagħti
inti ħarsa ġenerali blast malajr

742
00:33:26,900 --> 00:33:31,290
sabiex inkunu nistgħu jiksbu l Davin kollha
l-gost JavaScript u ta 'sigurtà affarijiet

743
00:33:31,290 --> 00:33:33,380
li forsi inti fil-fatt
tixtieq li tisma 'aktar dwar.

744
00:33:33,380 --> 00:33:36,600
>> OK, kif Hannah qal, jekk
għandek xi mistoqsijiet,

745
00:33:36,600 --> 00:33:39,170
Jien ser malajr wisq, jekk jogħġbok, let me know.

746
00:33:39,170 --> 00:33:42,114
I se twieġeb mistoqsijiet kif meħtieġ.

747
00:33:42,114 --> 00:33:45,280
Allura biex tibda, aħna qed tmur biex tibda bil
probabilment waħda mill-affarijiet ewwel

748
00:33:45,280 --> 00:33:48,730
inti tgħallimt ma 'web
programmazzjoni, permessi.

749
00:33:48,730 --> 00:33:52,720
Allura chmod, inti guys għandhom ġew ħadthom
kaptani f'dan kollha bl-web

750
00:33:52,720 --> 00:33:54,870
programmazzjoni li inti stajt
qed tagħmel dan l-aħħar.

751
00:33:54,870 --> 00:33:57,320
Huwa bażikament biss kmand
li tbiddel il-permessi

752
00:33:57,320 --> 00:34:00,779
jew il-permessi ta 'aċċess
tal tagħna oġġetti fajl sistema.

753
00:34:00,779 --> 00:34:02,570
Of course, li attwalment
tara dawn, jekk int

754
00:34:02,570 --> 00:34:04,910
jkollhom xi problemi ma 'dawn
matul settijiet problematiċi tiegħek,

755
00:34:04,910 --> 00:34:11,460
jista 'jkollok użati ls -l, li huwa twil,
biex tikseb it-tip ħsieb ta 'bħal dan,

756
00:34:11,460 --> 00:34:14,209
fejn int attwalment tara kollha
l-permessi għal fajl.

757
00:34:14,209 --> 00:34:16,850

758
00:34:16,850 --> 00:34:20,732
>> U tassew, aħna qed biss se jmorru
permezz pretty malajr kemm pretty

759
00:34:20,732 --> 00:34:21,940
ħafna dak li kull wieħed minn dawn jfisser.

760
00:34:21,940 --> 00:34:24,481
Allura aħna għandna d-dritt hawn, li
biss stands għall-direttorju.

761
00:34:24,481 --> 00:34:26,790

762
00:34:26,790 --> 00:34:31,739
Ovvjament dritt hawn, naraw rwx, li
huwa tinqara, writeable, u eżekutibbli.

763
00:34:31,739 --> 00:34:37,090
Dawn jistgħu wkoll ikunu rappreżentati bħala bits,
li aħna ser jsibu rwieħhom fuq il-paġna li jmiss.

764
00:34:37,090 --> 00:34:40,699
Allura kull trijade li rajna
hawn, dan huwa tliet triads.

765
00:34:40,699 --> 00:34:48,120
Aħna rwx, xejn r x u r
xejn x għal din l-ewwel fajl.

766
00:34:48,120 --> 00:34:49,690
Huwa din l-istruttura ġenerali.

767
00:34:49,690 --> 00:34:50,940
>> Allura aħna għandna xi direttorju.

768
00:34:50,940 --> 00:34:53,999
Għandna xi grupp ta 'utenti
ma 'dawn permessi.

769
00:34:53,999 --> 00:34:57,040
Xi grupp li għandu dawn permessi,
u dinja li għandha permess.

770
00:34:57,040 --> 00:34:59,420
Inti tista 'taħseb dawn bħala trijade.

771
00:34:59,420 --> 00:35:01,130
Inti tista 'taħseb dawn bħala tliet bits.

772
00:35:01,130 --> 00:35:04,060
Sabiex ikunu jistgħu jżommu l-valuri
kullimkien minn 0 sa

773
00:35:04,060 --> 00:35:07,350
sa 7, u huwa għalhekk li kultant
kellna inti tagħmel chmod

774
00:35:07,350 --> 00:35:17,510
600 minflok ta 'chmod rw x'ikun.

775
00:35:17,510 --> 00:35:19,170
Aħna ser jsibu rwieħhom eżempju hemmhekk.

776
00:35:19,170 --> 00:35:24,260
Imma bażikament, inti tista 'taħseb
minn dawn jew bħala biss rwx,

777
00:35:24,260 --> 00:35:28,520
jew inti tista 'taħseb minnhom bħala xi
Numru fejn dan l-ewwel waħda hawn

778
00:35:28,520 --> 00:35:31,480
jirrappreżenta numru bejn
0 u 7, din it-tieni wieħed

779
00:35:31,480 --> 00:35:33,970
jirrappreżenta numru bejn
0 u 7, u t-tielet wieħed

780
00:35:33,970 --> 00:35:38,245
jirrappreżenta numru bejn 0 u 7, OK?

781
00:35:38,245 --> 00:35:42,700
>> r ikollu valur ta '4. w
għandu valur ta '2, u x

782
00:35:42,700 --> 00:35:49,230
għandu valur ta '1, u huwa għalhekk li din il-
permess hawnhekk ikun chmod 700.

783
00:35:49,230 --> 00:35:53,520
Minħabba f'dan il-każ hawnhekk, jgħid aħna
kienu l-ewwel ftit hemm flipped fuq.

784
00:35:53,520 --> 00:35:55,380
Allura aħna għandna 4 għall tinqara.

785
00:35:55,380 --> 00:35:58,730
It-tieni bit hija flipped fuq għal
w, li huwa 2, hekk issa għandna 6.

786
00:35:58,730 --> 00:36:02,070
U t-tielet bit hija flipped fuq
għal x, li huwa 1, hekk aħna nikseb sebgħa.

787
00:36:02,070 --> 00:36:04,820
U ovvjament, grupp tagħna
u fid-dinja tagħna huma kull 0.

788
00:36:04,820 --> 00:36:07,770
Allura dan huwa wkoll il-
ekwivalenti ta 'chmod 700.

789
00:36:07,770 --> 00:36:12,081
U Nixtieq definittivament nipprova
jifhmu l-immappjar bejn dawk.

790
00:36:12,081 --> 00:36:14,080
M'inix ċert jekk ikollha
toħroġ fuq kwizz qabel,

791
00:36:14,080 --> 00:36:18,590
iżda jkun a
mistoqsija li jien tista 'titlob.

792
00:36:18,590 --> 00:36:22,110
>> Just ftit li jmorru saħansitra
aktar fil chmod hawn, hawn

793
00:36:22,110 --> 00:36:27,730
huwa l-ġenerali ħafna
struttura ta 'sejħa chmod.

794
00:36:27,730 --> 00:36:29,500
Allura naturalment, aħna għandna chmod hawn.

795
00:36:29,500 --> 00:36:34,410
Referenzi, dak li dan jirreferi għall huwa
li aħna jagħtu dawn permessi għall

796
00:36:34,410 --> 00:36:36,570
jew li qed we jieħdu dawn
permessi bogħod minn.

797
00:36:36,570 --> 00:36:44,330
Allura aħna għandna hawn fil-permessi,
bħal konna tak chmod plus x,

798
00:36:44,330 --> 00:36:45,440
kif aħna ser tara dalwaqt.

799
00:36:45,440 --> 00:36:48,460
a ifisser biss jagħtu dawn speċifika
permessi għal kulħadd.

800
00:36:48,460 --> 00:36:49,600
Jagħtuhom lil kulħadd.

801
00:36:49,600 --> 00:36:55,370
Allura inti tista 'faċilment jkollhom u plus x
jew g plus x jew o plus x jew multipla

802
00:36:55,370 --> 00:36:55,870
tiegħu.

803
00:36:55,870 --> 00:36:59,280
Allura li l-ewwel parti hija dejjem
se tkun referenzi.

804
00:36:59,280 --> 00:37:03,220
Min aħna jagħtu dawn permessi għal,
jew li qed aħna jeħodhom bogħod minn?

805
00:37:03,220 --> 00:37:04,850
>> It-tieni waħda hija l-operatur.

806
00:37:04,850 --> 00:37:07,350
Allura inti guys jkollhom aktar ttrattati plus.

807
00:37:07,350 --> 00:37:12,140
Dan jagħti permessi lil
min int tagħti minnhom,

808
00:37:12,140 --> 00:37:14,840
billi minus, loġikament, jneħħihom.

809
00:37:14,840 --> 00:37:16,880
Allura xejn wisq terribbli hemmhekk.

810
00:37:16,880 --> 00:37:23,060
U allura Modes huwa dak li aħna tkellem dwar
mal-qari, kitba, jew esekuzzjoni.

811
00:37:23,060 --> 00:37:29,070
Allura plus x ifisser jagħtu eżekutibbli
permessi għal kulħadd.

812
00:37:29,070 --> 00:37:33,430
U allura, ovvjament, li fuqha
fajl jew direttorju speċifiku.

813
00:37:33,430 --> 00:37:33,980
OK?

814
00:37:33,980 --> 00:37:36,010
Kulhadd tajba mal chmod?

815
00:37:36,010 --> 00:37:37,850
Mhux wisq ħażina?

816
00:37:37,850 --> 00:37:42,417
>> OK, hekk HTML, kwalunkwe inti huma
qodma biżżejjed to-- età MySpace?

817
00:37:42,417 --> 00:37:44,750
Jiena bgħatt dan it-Taqsima tiegħi,
u litteralment nofs il-persuni

818
00:37:44,750 --> 00:37:45,790
ħares lejn me simili I kien crazy.

819
00:37:45,790 --> 00:37:47,498
U I kien simili, guys,
aħna mhux qed dik qodma.

820
00:37:47,498 --> 00:37:48,910
Come fuq.

821
00:37:48,910 --> 00:37:53,360
Allura HyperText Markup Language,
huwa onestament biss mod għalik

822
00:37:53,360 --> 00:37:57,990
li juri ċerti affarijiet fuq il-web.

823
00:37:57,990 --> 00:37:59,210
Allura huwa lingwa markup.

824
00:37:59,210 --> 00:38:00,640
Mhuwiex lingwa scripting.

825
00:38:00,640 --> 00:38:02,160
M'hemm l-ebda loġika fiha.

826
00:38:02,160 --> 00:38:05,710
Huwa sempliċiment biex jibdlu l-
mod xi ħaġa hija murija.

827
00:38:05,710 --> 00:38:07,670
OK, hekk li l-importanti
distinzjoni li tagħmel.

828
00:38:07,670 --> 00:38:12,030
Huwa meqjus lingwa markup,
ma tkunx lingwa scripting.

829
00:38:12,030 --> 00:38:15,100
>> Allura hawnhekk għandna tags HTML tagħna.

830
00:38:15,100 --> 00:38:20,390
Fuq din slide huma probabbilment l-aktar mill-
dawk li inti għandek tkun familjari ma '

831
00:38:20,390 --> 00:38:22,390
u tkun verament komdi.

832
00:38:22,390 --> 00:38:25,700
Allura ovvjament, aħna għandna
tag HTML tagħna, li

833
00:38:25,700 --> 00:38:29,930
tinnomina li kollox fil
bejn dawn iż-żewġ se jkun HTML.

834
00:38:29,930 --> 00:38:33,070
Għandna xi rabta, li
ovvjament se jtik

835
00:38:33,070 --> 00:38:34,990
link għall-paġna web estern.

836
00:38:34,990 --> 00:38:37,520
Xi titolu, fi ħdan ras tagħna hawn.

837
00:38:37,520 --> 00:38:40,020
U aħna għandna ġisem tagħna ma
h1, li huwa header,

838
00:38:40,020 --> 00:38:42,260
u għalhekk ser jagħmilha sbieħ
u kuraġġużi u akbar.

839
00:38:42,260 --> 00:38:46,040
U mbagħad, aħna għandna xi
p, li huwa paragrafu.

840
00:38:46,040 --> 00:38:49,000
Inti għandek probabbilment tkun taf
u jkun familjari ma 'affarijiet

841
00:38:49,000 --> 00:38:54,030
simili kif inti daħħal immaġni, huma
hemm xi klassijiet oħra header?

842
00:38:54,030 --> 00:38:57,240
I se jkun definittivament
komda mal div.

843
00:38:57,240 --> 00:39:00,840
Allura dawn għandhom il-maġġoranza ta 'tikketti
li inti għandek tkun familjari magħhom.

844
00:39:00,840 --> 00:39:04,370
Iżda naturalment, kif ma 'kollox fil
CS 50, il-lista mhix eżawrjenti.

845
00:39:04,370 --> 00:39:08,200
Sabiex tagħmel żgur li int brush up fuq dik.

846
00:39:08,200 --> 00:39:13,260
>> CSS, hekk CSS, jekk kwalunkwe inti watch
seminar tiegħi minn żewġ ġimgħat ilu,

847
00:39:13,260 --> 00:39:16,250
huwa verament biss mod
stil web page tiegħek?

848
00:39:16,250 --> 00:39:18,950
OK, hekk aħna xi lingwa markup.

849
00:39:18,950 --> 00:39:23,220
HTML, li jieħu ħsieb ta 'ftit it-test
u fejn jista 'jkun fuq il-paġna.

850
00:39:23,220 --> 00:39:25,760
Imma CSS huwa verament dak li jagħmilha pretty.

851
00:39:25,760 --> 00:39:30,690
Inti jista 'jkollhom dawn fil HTML tiegħek
files, imma kif aħna se nitkellmu dwar aktar tard,

852
00:39:30,690 --> 00:39:32,660
Jien pretty ċert li jista
jkun l-slide li jmiss, huwa

853
00:39:32,660 --> 00:39:35,620
hija prattika komuni, u fil-fatt
prattika li aħna verament jinkoraġġixxu,

854
00:39:35,620 --> 00:39:40,670
għalik li jżommhom sseparati meta aħna
jitkellmu dwar MVC u li paradigma kollu.

855
00:39:40,670 --> 00:39:42,490
Li tassew dak li dan b'mos.

856
00:39:42,490 --> 00:39:46,110
>> Allura CSS huwa biss mod li
tagħmel affarijiet jidhru pretty.

857
00:39:46,110 --> 00:39:50,500
L-affarijiet hawn, bħall-
ġisem u #title u info,

858
00:39:50,500 --> 00:39:54,340
dawn huma msejħa seletturi u liema
huma jagħmlu huwa li jagħżlu l-affarijiet speċifiċi

859
00:39:54,340 --> 00:39:59,260
fi ħdan fajl HTML tiegħek
u japplikaw tkun xi tkun stil,

860
00:39:59,260 --> 00:40:04,090
ikun x'ikun it-tip ta 'affarijiet li inti tixtieq,
għal dak l-element speċifiku ta 'web tiegħek

861
00:40:04,090 --> 00:40:04,590
paġna.

862
00:40:04,590 --> 00:40:08,820
Allura hawnhekk, aħna għandna
kulur fl-isfond u kulur

863
00:40:08,820 --> 00:40:12,450
u familja font thats qed
applikati għal dak kollu huwa fil-ġisem.

864
00:40:12,450 --> 00:40:15,530
Allura jekk aħna ħares lura hawn, huwa
ma tapplikax għat-titolu.

865
00:40:15,530 --> 00:40:22,340
Ikun japplika biss għal dak li huwa
f'dawn seletturi ġisem, OK?

866
00:40:22,340 --> 00:40:25,250
>> Bil titolu hawnhekk, dan huwa
ser ikunu l-istess ħaġa,

867
00:40:25,250 --> 00:40:28,410
il-kulur tat-test
tkun blu huwa biss se

868
00:40:28,410 --> 00:40:33,870
li jaffettwa dak li huwa fi ħdan
l-seletturi titolu.

869
00:40:33,870 --> 00:40:36,580
Kif ukoll info hawn,
it-test se jkun roża,

870
00:40:36,580 --> 00:40:38,600
ikun x'ikun l info, li huwa dritt hawn.

871
00:40:38,600 --> 00:40:40,860
Allura l-unika ħaġa li
Ikun roża fuq din il-paġna

872
00:40:40,860 --> 00:40:44,100
huwa data, it-tnejn 17 Novembru, 2014.

873
00:40:44,100 --> 00:40:48,770
OK, hekk CSS huwa biss mod li
jkollhom aktar kontroll over-- iva?

874
00:40:48,770 --> 00:40:51,850
>> UDJENZA: Għaliex għandek
li tuża l-hash ma titlu?

875
00:40:51,850 --> 00:40:55,170
>> HANNAH: slide Sussegwentement, wegħda!

876
00:40:55,170 --> 00:40:56,810
Aħna ser naslu s'hemm.

877
00:40:56,810 --> 00:40:59,830
Allura dan huwa għaliex irridu nużaw hash.

878
00:40:59,830 --> 00:41:03,429
Allura seletturi tieħu fuq tliet prinċipali
forom li aħna jitkellem miegħek guys dwar.

879
00:41:03,429 --> 00:41:05,595
I fyou tixtieq titgħallem aktar,
hemm ħafna hemmhekk.

880
00:41:05,595 --> 00:41:07,540
Hemm dokumentazzjoni CSS kbira.

881
00:41:07,540 --> 00:41:12,680
Hemm isem tag, li għandha tagħmel
ma 'biss tags normali tiegħek fil-HTML.

882
00:41:12,680 --> 00:41:17,210
Allura H1, p, div, h2,
dawk l-xorta ta 'affarijiet.

883
00:41:17,210 --> 00:41:20,320
U nistgħu ftit insemmu dawk kif inhu.

884
00:41:20,320 --> 00:41:22,650
Allura kif naraw hawn ma
ġisem, huwa tag normali.

885
00:41:22,650 --> 00:41:26,660
Allura nistgħu biss jitqiegħed ġisem meta
aħna qed jitkellem fil-fajl CSS tagħna.

886
00:41:26,660 --> 00:41:29,730
>> Bl-titolu, r-raġuni kollha we
jkollhom din hash hija li għandna x'hemm

887
00:41:29,730 --> 00:41:31,010
meqjus ID.

888
00:41:31,010 --> 00:41:35,400
Allura ID għandhom dejjem ikunu
uniku fi ħdan paġna HTML tiegħek

889
00:41:35,400 --> 00:41:37,930
b'tali mod li meta inti
jirreferu għaliha, inti

890
00:41:37,930 --> 00:41:41,990
taf li int biss jirreferu
li ħaġa waħda speċifika.

891
00:41:41,990 --> 00:41:46,270
Allura f'dan il-każ hawnhekk, mal tagħna
h1 hawn, sessjoni reviżjoni CS 50,

892
00:41:46,270 --> 00:41:47,810
għandna id ta 'titolu.

893
00:41:47,810 --> 00:41:54,280
Allura biex jirreferu biss għal din
biċċa ta 'HTML tagħna, nagħmlu titolu hash.

894
00:41:54,280 --> 00:41:58,080
Just billi konvenzjoni, IDs huma nominati
bi hash quddiem minnhom.

895
00:41:58,080 --> 00:42:01,650
Bl-istess mod, naraw
info hawn huwa klassi.

896
00:42:01,650 --> 00:42:06,070
U hekk klassi CSS huwa
innominata bħala tikka klassi

897
00:42:06,070 --> 00:42:08,895
jew dot kwalunkwe dik il-klassi hi.

898
00:42:08,895 --> 00:42:10,850
Allura f'dan il-każ hawnhekk, huwa info.

899
00:42:10,850 --> 00:42:13,090
>> So I teħodha lura.

900
00:42:13,090 --> 00:42:16,200
Kemm minn dawn jistgħu jkunu
roża għal CSS tagħna hawn

901
00:42:16,200 --> 00:42:18,430
għaliex it-tnejn ikollhom klassi ta 'info.

902
00:42:18,430 --> 00:42:23,070
U fil-fajl CSS tagħna, aħna għandna nominati
li xejn ma 'klassi ta' info

903
00:42:23,070 --> 00:42:24,120
għandu jkun roża.

904
00:42:24,120 --> 00:42:25,968
Does li jagħmel sens?

905
00:42:25,968 --> 00:42:27,435
Iva?

906
00:42:27,435 --> 00:42:30,731
>> UDJENZA: Jekk ġejt biex tagħmel
kollox fil--abjad tal-ġisem,

907
00:42:30,731 --> 00:42:32,814
u mbagħad inti tipprova tagħmel
xi ħaġa ġewwa fih blu,

908
00:42:32,814 --> 00:42:34,770
li kieku jikkawża problemi?

909
00:42:34,770 --> 00:42:37,310
>> HANNAH: Allura CSS huwa
folji stil cascading.

910
00:42:37,310 --> 00:42:40,730
Allura x'ikun hija lejn l-
qiegħ se jieħdu preċedenza.

911
00:42:40,730 --> 00:42:44,080
Mela jekk inti tagħmel xi ħaġa mal-ġisem,
u inti tagħmel dak kollu abjad,

912
00:42:44,080 --> 00:42:49,300
u mbagħad aktar tard inti ibiddel it-titolu
jew tibdel it-test fil-ġisem,

913
00:42:49,300 --> 00:42:50,560
dan overwrites dik.

914
00:42:50,560 --> 00:42:55,360
Allura xejn lejn il-
qiegħ se jieħdu preċedenza.

915
00:42:55,360 --> 00:42:56,730
Iva?

916
00:42:56,730 --> 00:42:59,627
>> Udjenza: U IDs huma uniċi,
imma klassijiet tista 'tkun aktar?

917
00:42:59,627 --> 00:43:00,210
HANNAH: Dritt.

918
00:43:00,210 --> 00:43:06,320
Allura IDs għandu jkun uniku, u l-klassijiet jista
jirreferu għal kif ħafna affarijiet kif inti tixtieq.

919
00:43:06,320 --> 00:43:07,580
Kwalunkwe mistoqsijiet oħra?

920
00:43:07,580 --> 00:43:09,800
Iva.

921
00:43:09,800 --> 00:43:11,210
>> UDJENZA: [inaudible].

922
00:43:11,210 --> 00:43:13,509
Jien jistaqsi jekk
li jagħmel differenza.

923
00:43:13,509 --> 00:43:15,217
HANNAH: Jien sorry,
dak li kien il-kwistjoni?

924
00:43:15,217 --> 00:43:18,960
UDJENZA: Hemm żgħir
"F" u kapital "F."

925
00:43:18,960 --> 00:43:21,440
HANNAH: Allura l-differenza
bejn żgħir "f" u kapital "F"

926
00:43:21,440 --> 00:43:22,606
m'għandhomx jagħmlu differenza.

927
00:43:22,606 --> 00:43:26,330
Allura "f" se jkun ta '15 jew mod.

928
00:43:26,330 --> 00:43:28,130
Kessaħ, kull ħaġ'oħra?

929
00:43:28,130 --> 00:43:29,930
Kulħadd tajba, CSS?

930
00:43:29,930 --> 00:43:30,850
Iva?

931
00:43:30,850 --> 00:43:31,790
>> UDJENZA: Jiddispjacini.

932
00:43:31,790 --> 00:43:35,550
Inti jista 'jkollhom klassi u ID?

933
00:43:35,550 --> 00:43:38,030
>> HANNAH: Iva, inti tista '.

934
00:43:38,030 --> 00:43:40,420
Affarijiet jistgħu jkollhom kemm klassi u ID.

935
00:43:40,420 --> 00:43:44,670
U jien jirrakkomanda ħafna
ittestjar dawn fuq tiegħek stess.

936
00:43:44,670 --> 00:43:50,480
CSS inti ser jitgħallmu l-aħjar biss billi tagħmel
xi ħaġa, web page sempliċi ħafna,

937
00:43:50,480 --> 00:43:53,440
tfassil xi CSS, u biss
jara kif dawn jinteraġixxu.

938
00:43:53,440 --> 00:43:56,970
U inti ser jiksbu tajba ħafna,
sens intuwittivi għall kif taħdem.

939
00:43:56,970 --> 00:43:58,810
>> OK, kulħadd tajba mal CSS?

940
00:43:58,810 --> 00:44:01,280
Int kollha ser jagħmlu
websajts sbieħ ma CSS issa.

941
00:44:01,280 --> 00:44:05,460
OK, l-aħjar prattiki, biss
affarijiet li wieħed iżomm f'moħħu, affarijiet

942
00:44:05,460 --> 00:44:09,810
that-- dan huwa għaliex aħna dock
you for disinjatur u whatnot.

943
00:44:09,810 --> 00:44:11,820
Allura qrib kollha tags HTML tiegħek.

944
00:44:11,820 --> 00:44:14,840
Mela jekk għandek xi korp miftuħ,
għandu jkun hemm korp qrib.

945
00:44:14,840 --> 00:44:18,180
Jekk għandek paragrafu miftuħa,
għandu jkun hemm il-paragrafu qrib.

946
00:44:18,180 --> 00:44:19,555
Iċċekkja biex tara il-paġna tiegħek tivvalida.

947
00:44:19,555 --> 00:44:23,330
You guys għandek tkun familjari ħafna
ma dan mill-p sett sebgħa

948
00:44:23,330 --> 00:44:26,350
bl CS 50 finanzi
mal-validatur W3.

949
00:44:26,350 --> 00:44:28,340
U kif għidt qabel,
wieħed ta 'mudelli kbar tagħna

950
00:44:28,340 --> 00:44:33,780
huwa tissepara l-istil tiegħek ma 'CSS
minn markup tiegħek, li huwa HTML.

951
00:44:33,780 --> 00:44:36,900
U allura, ovvjament, għandna
dan XKCD kbira stabbiliti hawn.

952
00:44:36,900 --> 00:44:38,280
Yay, eżenzjoni komiks!

953
00:44:38,280 --> 00:44:41,340
>> OK, TCP / IP.

954
00:44:41,340 --> 00:44:44,650
Bejn dawn u HTTP,
bażikament dawn qed kemm protokolli.

955
00:44:44,650 --> 00:44:46,810
Allura inti tista 'biss jaħsbu
minnhom bħala sett ta 'regoli

956
00:44:46,810 --> 00:44:50,110
li jirregolaw kif l-affarijiet
jimxu madwar l-internet.

957
00:44:50,110 --> 00:44:53,410
Allura kontroll trasmissjoni
protokoll, jew protokoll internet,

958
00:44:53,410 --> 00:44:57,280
huwa biss mod biex niżguraw
li d-data gets fejn huwa għaddej

959
00:44:57,280 --> 00:45:00,030
u li nafu jekk
aħna qed qatt dejta nieqsa.

960
00:45:00,030 --> 00:45:03,520
Mela jekk inti guys think lura għal lecture
koppja ġimgħat ilu bl David

961
00:45:03,520 --> 00:45:06,980
fejn kellna erba pakketti, huma
kienu kollha nnumerati bħal wieħed ta 'erba,

962
00:45:06,980 --> 00:45:11,300
tnejn ta 'erba, tlieta minn erbgħa, erba ta'
erbgħa, din hija biss sett ta 'regoli.

963
00:45:11,300 --> 00:45:13,830
Aħna qal, OK, kull meta aħna qed
jibgħat packet aktar minn wieħed,

964
00:45:13,830 --> 00:45:16,610
aħna ser jinnumera
ma 'dak in-numru huwa

965
00:45:16,610 --> 00:45:19,040
u kemm-total li
l-utent għandu tikseb.

966
00:45:19,040 --> 00:45:22,540
>> U dan huwa biss javżak min
qed tirċievi l-informazzjoni jekk huma

967
00:45:22,540 --> 00:45:26,120
gotten kollox jew jekk
xi ħaġa ltqajna mitlufa matul it-triq.

968
00:45:26,120 --> 00:45:28,840
U jeħtieġ li jistaqsu għal darb'oħra.

969
00:45:28,840 --> 00:45:31,140
Dan huwa verament ftit sett ta 'regoli.

970
00:45:31,140 --> 00:45:33,650
Thats kif inti tista 'taħseb ta' dan, OK?

971
00:45:33,650 --> 00:45:37,700
U wkoll, tispeċifika l-port, liema
inti guys can-- naf waqt lecture,

972
00:45:37,700 --> 00:45:39,170
huma kellhom lista sħiħa ta 'portijiet.

973
00:45:39,170 --> 00:45:41,630
Iżda aħna ma jkollhom magħhom hawnhekk dritt issa.

974
00:45:41,630 --> 00:45:45,290
>> Protokoll ta 'trasferiment Portugues Allura
huwa, għal darb'oħra, huwa protokoll ieħor.

975
00:45:45,290 --> 00:45:48,630
Allura huwa sett ieħor ta 'regoli
li jirregolaw, f'dan il-każ,

976
00:45:48,630 --> 00:45:51,130
kif Portugues huwa trasferit.

977
00:45:51,130 --> 00:45:54,340
Allura huwa biss tippermetti browsers
biex tkellem lil servers mill-web.

978
00:45:54,340 --> 00:45:56,910
U kif għidna hawn, huwa
bħal handshaking bniedem.

979
00:45:56,910 --> 00:46:00,480
Huwa biss mod li jirregola
kif il-web server huwa

980
00:46:00,480 --> 00:46:02,690
ser jinteraġixxu mal-browser tiegħek.

981
00:46:02,690 --> 00:46:05,660
U aħna għandna biss ftit eżempji.

982
00:46:05,660 --> 00:46:09,100
Għandna xi talbiet hawn
fejn IKOLLOK huwa l-metodu.

983
00:46:09,100 --> 00:46:13,760
Għandna HTTP 1.1, li hija
Verżjoni protokoll għalina.

984
00:46:13,760 --> 00:46:17,230
U mbagħad, l-ospitanti, li huwa dak li
aħna qed attwalment jippruvaw jiksbu aċċess għas.

985
00:46:17,230 --> 00:46:21,800
U allura, kif tara hawn, aħna
nikseb xi rispons ma 'dan 200

986
00:46:21,800 --> 00:46:25,032
OK bħala kodiċi ta 'rispons HTTP tagħna.

987
00:46:25,032 --> 00:46:27,240
Għandna lista big jien ser
pull up fit-tieni waħda

988
00:46:27,240 --> 00:46:29,430
li inti guys għandhom ikunu familjari mal.

989
00:46:29,430 --> 00:46:35,750
U aħna għandna dan it-tip kontenut ta 'test / HTML,
li biss jgħid liema tip ta 'data

990
00:46:35,750 --> 00:46:39,990
aħna jirċievu mis-server, OK?

991
00:46:39,990 --> 00:46:44,230
Dan ospitanti u dan it-tip kontenut
huma parti mill-headers HTTP.

992
00:46:44,230 --> 00:46:49,610
Inti jista 'jkollu bħala ftit jew ftit kemm
meħtieġa għall-kuntest ta 'dak

993
00:46:49,610 --> 00:46:50,580
int jittrattaw.

994
00:46:50,580 --> 00:46:53,371
Kultant inti ser ikollok ħafna ta '
informazzjoni li ġejjin minn server tiegħek.

995
00:46:53,371 --> 00:46:56,040
Forsi dawn qed titlob ħafna
ta 'informazzjoni mill-utent.

996
00:46:56,040 --> 00:46:57,600
Hija tvarja skond il-kuntest.

997
00:46:57,600 --> 00:47:01,144
Jekk inti tħares lejn CS 50 Istudju,
hemm ħafna aktar fuq dan.

998
00:47:01,144 --> 00:47:03,060
Imma aħna għandna ħafna biex tikseb
permezz, hekk jien ser

999
00:47:03,060 --> 00:47:05,760
li tmur dritt quddiemhom, jekk
li OK miegħek guys?

1000
00:47:05,760 --> 00:47:07,960
Kessaħ.

1001
00:47:07,960 --> 00:47:08,460
Żomm fuq.

1002
00:47:08,460 --> 00:47:11,182
I definitely jkollhom dik
lista sħiħa of-- huh!

1003
00:47:11,182 --> 00:47:13,140
I do not know għaliex dan huwa
it-triq kollha fuq hawn.

1004
00:47:13,140 --> 00:47:15,660
Ħsibt I litteralment mċaqalqa
dan filwaqt I kien sitting--

1005
00:47:15,660 --> 00:47:16,540
>> Davin: Do inti tixtieq li jgħallmu dan?

1006
00:47:16,540 --> 00:47:17,420
Jew tridu lili biex jgħallmu dan?

1007
00:47:17,420 --> 00:47:20,010
>> UDJENZA: Ħsibt nistgħu
biss juru lilhom biex jibdew bihom.

1008
00:47:20,010 --> 00:47:22,210
I mean, inti tista 'tmur fis
b'mod ulterjuri, imma jien

1009
00:47:22,210 --> 00:47:26,030
ħasbu li jsir aktar sens peress I
kien biss jitkellem dwar statuses HTTP.

1010
00:47:26,030 --> 00:47:28,200
Allura hawnhekk il-lista sħiħa.

1011
00:47:28,200 --> 00:47:31,730
I raden x'inhu jiġri hu
Davin se jmorru ġo fihom aktar tard.

1012
00:47:31,730 --> 00:47:35,330
Iżda hemm lista sħiħa, a
preview tal-togħma li ġejjin.

1013
00:47:35,330 --> 00:47:41,640
OK, aħna qed tmur biex blow-- dan se
li jkun kors tiġrifa PHP ebda simili oħra.

1014
00:47:41,640 --> 00:47:44,874
>> Allura PHP, Preprocessor Portugues,
huwa backronym rikursivi,

1015
00:47:44,874 --> 00:47:46,540
li jfisser li kien imsemmi xi ħaġa oħra.

1016
00:47:46,540 --> 00:47:49,050
U allura dawn kienu simili, din
ma verament jagħmel sens.

1017
00:47:49,050 --> 00:47:52,210
Allura huma biss jismu it--
u kien akronimu,

1018
00:47:52,210 --> 00:47:54,840
hekk huma biss għamilha PHP
Preprocessor Portugues, li

1019
00:47:54,840 --> 00:47:55,980
biss jagħmel ebda sens.

1020
00:47:55,980 --> 00:47:57,714
Istorja gost.

1021
00:47:57,714 --> 00:47:58,880
Huwa lingwa ta 'programmar.

1022
00:47:58,880 --> 00:48:02,360
Allura kemm I jenfasizzaw li
HTML ma tkunx lingwa ta 'programmar,

1023
00:48:02,360 --> 00:48:05,350
huwa lingwa markup, PHP
hija lingwa ta 'programmar.

1024
00:48:05,350 --> 00:48:07,422
Kif inti taf li dan huwa
minħabba li hemm loġika.

1025
00:48:07,422 --> 00:48:08,380
Hemm conditionals.

1026
00:48:08,380 --> 00:48:12,750
Għandna varjabbli, filwaqt li aħna
jkollhom ebda waħda minn dawn l-affarijiet fil-HTML.

1027
00:48:12,750 --> 00:48:16,960
>> Kull dritt, allura għandna dan ftit
daqsxejn hawnhekk li huwa simili togħma ta 'PHP.

1028
00:48:16,960 --> 00:48:20,510
Allura baŜi, ismijiet varjabbli
tibda bil-sinjal dollaru.

1029
00:48:20,510 --> 00:48:21,500
Lottijiet ta 'nies bhalu.

1030
00:48:21,500 --> 00:48:22,371
Tfakkarna minna flus.

1031
00:48:22,371 --> 00:48:22,995
Dan kollu kbir.

1032
00:48:22,995 --> 00:48:25,280
Aħna kollha jridu PHP.

1033
00:48:25,280 --> 00:48:28,020
Allura aħna ma jispeċifikawx
tip jibqgħalu varjabbli tal.

1034
00:48:28,020 --> 00:48:29,995
Huwa determinat fil-ħin run.

1035
00:48:29,995 --> 00:48:32,710

1036
00:48:32,710 --> 00:48:35,890
L-interpretu se jkun simili,
oh, aħna ser biss run permezz,

1037
00:48:35,890 --> 00:48:39,565
u skond il-kuntest,
Ser naraw liema tipi ta 'tipi

1038
00:48:39,565 --> 00:48:41,560
dawn il-varjabbli jeħtieġ li jkollhom.

1039
00:48:41,560 --> 00:48:42,815
M'hemm l-ebda funzjoni prinċipali.

1040
00:48:42,815 --> 00:48:43,690
Affarijiet se biss run.

1041
00:48:43,690 --> 00:48:47,851
You guys ma 'l-importazzjoni tiegħek fil tiegħek
p sett aħħar, inti ser ikollok avviż dan.

1042
00:48:47,851 --> 00:48:49,350
Ma kienx hemm verament funzjoni prinċipali.

1043
00:48:49,350 --> 00:48:52,070
Inti biss kiteb dak
int riedu li jiġri.

1044
00:48:52,070 --> 00:48:53,280
U hija biss it-tip ta ġara.

1045
00:48:53,280 --> 00:48:56,760
Allura dak PHP għalik.

1046
00:48:56,760 --> 00:48:59,180
>> Arrays huma simili ħafna.

1047
00:48:59,180 --> 00:49:01,270
Aħna xorta jkollhom dan bracket.

1048
00:49:01,270 --> 00:49:05,940
Hawnhekk, aħna għandna xi varjabbli
imsejħa arr, u huwa ugwali

1049
00:49:05,940 --> 00:49:08,540
to-- għandna normali tagħna
notazzjoni parentesi.

1050
00:49:08,540 --> 00:49:10,630
U aħna għandna xi valur ċavetta.

1051
00:49:10,630 --> 00:49:14,630
U d-differenza kbira
bejn C u PHP arrays

1052
00:49:14,630 --> 00:49:19,330
hija li aħna jista 'jkollhom dan associate--
nistgħu jassoċjaw valuri għal ċwievet.

1053
00:49:19,330 --> 00:49:22,440
Allura minflok sempliċiment li jkollhom
firxa li hija indiċjata

1054
00:49:22,440 --> 00:49:26,630
bin-numru jew il-pożizzjoni
ta 'dak l-element fil-firxa,

1055
00:49:26,630 --> 00:49:29,060
nistgħu attwalment jassoċja ma 'ċavetta.

1056
00:49:29,060 --> 00:49:36,700
Fejn nistgħu ngħidu, OK, I jridu x'ikun
valur huwa assoċjat ma 'frott.

1057
00:49:36,700 --> 00:49:39,280
U forsi aħna għandna frott marru għall-banana.

1058
00:49:39,280 --> 00:49:41,760
Għalhekk d tirritorna banana lilna.

1059
00:49:41,760 --> 00:49:44,100
>> Imma bażikament, l-aktar
Ħaġa qawwija dwar dan

1060
00:49:44,100 --> 00:49:47,960
hija li jekk inti guys tiftakar il-
demo minn taħdita fejn aħna bażikament

1061
00:49:47,960 --> 00:49:53,050
speller rewrote fil-PHP, u dan
lookup was-- kien verament ftit simili,

1062
00:49:53,050 --> 00:49:55,007
ma teżistix dan ewlenin?

1063
00:49:55,007 --> 00:49:56,590
Li tassew it-tip tal-qawwa ta 'dan.

1064
00:49:56,590 --> 00:49:58,560
Inti ma għandekx bżonn li jtenni
permezz firxa tiegħek.

1065
00:49:58,560 --> 00:50:00,311
Inti ma għandekx bżonn tkun taf
dak l-ispazju huwa fil.

1066
00:50:00,311 --> 00:50:01,976
Dan jista 'jkun fl-aħħar jew il-bidu.

1067
00:50:01,976 --> 00:50:04,790
Sakemm inti taf l-muftieħ
thats assoċjat mal-valur,

1068
00:50:04,790 --> 00:50:09,740
PHP tista 'biss bżiq dak il-valur
dritt lura fil inti, OK?

1069
00:50:09,740 --> 00:50:12,960
>> U allura, aħna wkoll biss
jkollhom biss għaliex aħna

1070
00:50:12,960 --> 00:50:16,750
jista 'jkollhom pari b'valur ewlenin
ma jfissirx li inti għandek.

1071
00:50:16,750 --> 00:50:19,180
Tista 'wkoll biss joħolqu
firxa normali bħal hawn,

1072
00:50:19,180 --> 00:50:21,540
fil-qiegħ, fejn huwa
biss wieħed, tnejn, tlieta, erbgħa.

1073
00:50:21,540 --> 00:50:22,510
Dawk huma l-valuri tagħna.

1074
00:50:22,510 --> 00:50:25,320
U fil-fatt, ċwievet tagħhom huma l-indiċijiet.

1075
00:50:25,320 --> 00:50:26,830
Allura l-muftieħ għal wieħed ikun żero.

1076
00:50:26,830 --> 00:50:28,610
Il-muftieħ għal żewġ tkun waħda.

1077
00:50:28,610 --> 00:50:31,910
Hekk u ibqa 'sejjer hekk, sakemm
inti espliċitament tassenja ewlenin,

1078
00:50:31,910 --> 00:50:34,630
inti tista 'tassumi li l-
valur huwa biss indiċi tagħhom.

1079
00:50:34,630 --> 00:50:37,290
Does li jagħmel sens għal kulħadd?

1080
00:50:37,290 --> 00:50:38,070
Ebda mistoqsijiet?

1081
00:50:38,070 --> 00:50:38,930
Tal-biża.

1082
00:50:38,930 --> 00:50:44,420
>> OK, foreach huwa mod biex
jtenni permezz arrays tiegħek.

1083
00:50:44,420 --> 00:50:47,490
Allura aħna għandna xi ħaġa hawn,
biss l-istruttura ġenerali.

1084
00:50:47,490 --> 00:50:51,020
Allura foreach, l-isem ta '
firxa tagħna, kif ikun x'ikun

1085
00:50:51,020 --> 00:50:53,930
inti tixtieq li sejħa kull
element fil-firxa tiegħek,

1086
00:50:53,930 --> 00:50:57,270
u nistgħu nagħmlu xi ħaġa ma '
dak l-element jew ma 'dak il-valur.

1087
00:50:57,270 --> 00:50:58,680
Allura aħna għandna eżempju hawn.

1088
00:50:58,680 --> 00:51:05,770
Għandna assoċjattiva
firxa b'dawn iż-żewġ daħliet

1089
00:51:05,770 --> 00:51:10,080
mal-bar li huma assoċjati ma 'foo
u QUX li huma assoċjati ma 'baz.

1090
00:51:10,080 --> 00:51:12,180
Allura ċwievet huma foo u baz.

1091
00:51:12,180 --> 00:51:13,650
Valuri huma bar u QUX.

1092
00:51:13,650 --> 00:51:18,560
Allura foreach, aħna għandna firxa tagħna
hawnhekk, bħala l-par-valur ċavetta.

1093
00:51:18,560 --> 00:51:21,560
Dan jippermetti magħna biex l-aċċess
kemm il-ċavetta u l-valur.

1094
00:51:21,560 --> 00:51:23,680
Forsi inti biss trid li l-
valur, f'liema każ

1095
00:51:23,680 --> 00:51:27,640
inti tista 'biss do simili arr
bħala l-valur $, u allura inti

1096
00:51:27,640 --> 00:51:30,640
huma biss aċċess għall-valur
kif inti jtenni permezz.

1097
00:51:30,640 --> 00:51:32,600
Imma forsi, għal xi
raġuni, inti tixtieq l-muftieħ,

1098
00:51:32,600 --> 00:51:35,460
huwa għalhekk li I għażlet
dan l-eżempju minflok.

1099
00:51:35,460 --> 00:51:40,240
Allura inti tista 'attwalment timmanipola
ewlenin u l-valur f'dan il-każ.

1100
00:51:40,240 --> 00:51:41,070
OK?

1101
00:51:41,070 --> 00:51:41,905
Mistoqsija?

1102
00:51:41,905 --> 00:51:44,279
>> UDJENZA: Jekk int riedu
biss jimmanipula l-muftieħ, kieku

1103
00:51:44,279 --> 00:51:45,910
għandek tagħmel foreach--

1104
00:51:45,910 --> 00:51:47,360
>> Alison: Dritt.

1105
00:51:47,360 --> 00:51:50,560
Mela jekk int riedu
jimmanipulaw biss il-muftieħ,

1106
00:51:50,560 --> 00:51:53,680
inti xorta bżonn dan
sintassi għaliex jekk inti biss

1107
00:51:53,680 --> 00:51:56,930
ikollhom arr bħala xi ħaġa,
bħala ħaġa waħda, huwa

1108
00:51:56,930 --> 00:52:00,070
ser tassumi inti tixtieq
il-valur, mhux il-ċavetta.

1109
00:52:00,070 --> 00:52:06,780
Mela jekk inti qatt biss għandek bħad
arr kif, forsi dan huwa simili $ element,

1110
00:52:06,780 --> 00:52:11,670
li għaddej biex jassumi li inti qed tistaqsi
biss għall-valur f'kull punt.

1111
00:52:11,670 --> 00:52:13,879
Jekk inti tixtieq espliċitament li
tagħmel xi ħaġa ma 'l-ċavetta,

1112
00:52:13,879 --> 00:52:16,170
anki jekk inti ma tkunx qed tmur biex
tagħmel xejn mal-valur,

1113
00:52:16,170 --> 00:52:18,430
għandek bżonn din l-istruttura
li għandna hawnhekk

1114
00:52:18,430 --> 00:52:22,330
fejn int tistaqsi espliċitament
kemm għall-ċavetta u l-valur.

1115
00:52:22,330 --> 00:52:24,170
Kwistjoni kbira.

1116
00:52:24,170 --> 00:52:25,940
Xi ħaġa oħra?

1117
00:52:25,940 --> 00:52:27,490
Kessaħ.

1118
00:52:27,490 --> 00:52:29,911
>> Dritt Kollha, PHP u HTML.

1119
00:52:29,911 --> 00:52:31,410
Oh, aħna qed lura għall-p sett sebgħa mill-ġdid.

1120
00:52:31,410 --> 00:52:35,380
Allura dan għandu tfittex ftit familjari.

1121
00:52:35,380 --> 00:52:41,760
Allura dan huwa xi forma HTML sempliċi
li għandha xi isem input ta bonjour.

1122
00:52:41,760 --> 00:52:43,820
U naraw li għandna metodu tagħna ta 'IKOLLOK.

1123
00:52:43,820 --> 00:52:47,430
U jekk aħna niftakru minn tagħna p-sett,
meta tiġi sottomessa din il-formola,

1124
00:52:47,430 --> 00:52:58,130
hija tibgħat firxa msejħa $ _GET li għandu
kollha ta 'dawn l-inputs jew varjabbli minn

1125
00:52:58,130 --> 00:53:00,490
il-formola li għandu jkun
manipulati fil-PHP tagħna.

1126
00:53:00,490 --> 00:53:03,320
Allura f'dan il-każ, l-utent
ipoġġiha fl-isem tagħhom.

1127
00:53:03,320 --> 00:53:04,370
Huma tissottomettih.

1128
00:53:04,370 --> 00:53:07,810
U naraw li aħna nikseb xi firxa hawn.

1129
00:53:07,810 --> 00:53:09,080
Għandna firxa IKOLLOK tagħna.

1130
00:53:09,080 --> 00:53:11,510
U aħna qegħdin jaċċessaw l-isem.

1131
00:53:11,510 --> 00:53:15,070
>> Allura li jgħid, OK, agħtini l-
valur thats assoċjat ma 'isem,

1132
00:53:15,070 --> 00:53:16,550
isem huwa l-muftieħ hawnhekk.

1133
00:53:16,550 --> 00:53:21,400
U li mapep direttament ma 'dak li
għidna isem input tagħna huwa.

1134
00:53:21,400 --> 00:53:28,960
Allura dan kien giving you l-muftieħ għal dak
se tkun fil-firxa tiegħek hawn.

1135
00:53:28,960 --> 00:53:31,220
Does li jagħmel sens għal kulħadd?

1136
00:53:31,220 --> 00:53:32,070
Iva?

1137
00:53:32,070 --> 00:53:36,240
>> UDJENZA: Does l-isem fil IKOLLOK jirreferu
mal-linja vjola fi [inaudible]?

1138
00:53:36,240 --> 00:53:37,740
>> Alison: Hija tirreferi għal dan hawn.

1139
00:53:37,740 --> 00:53:43,840
Allura dan il-qasam id-dritt hawn,
hija tirreferi għal dan l-isem hawnhekk.

1140
00:53:43,840 --> 00:53:47,800
Allura dan seta 'kien jismu
bħal numru tat-telefon, jew ikun x'ikun.

1141
00:53:47,800 --> 00:53:51,790
Dan l-isem fil-fatt jgħid, liema
huma inti ssejjaħ f'dan il-qasam?

1142
00:53:51,790 --> 00:53:53,600
Kif inti tmur biex
jirreferu għal dan il-qasam?

1143
00:53:53,600 --> 00:53:57,670
U dan l-isem huwa attwalment simili, aħna qed
qal dan il-qasam huwa msejjaħ isem.

1144
00:53:57,670 --> 00:53:59,224
Thats kif aħna qed tmur li jkollhom aċċess għaliha.

1145
00:53:59,224 --> 00:54:02,070
>> UDJENZA: Allura li huwa simili,
isem input ugwali Bob, and--

1146
00:54:02,070 --> 00:54:04,380
>> Alison: Dritt, allura inti
se tikseb Bob stabbiliti hemmhekk.

1147
00:54:04,380 --> 00:54:06,090
Eżattament.

1148
00:54:06,090 --> 00:54:07,800
Kulħadd jibred?

1149
00:54:07,800 --> 00:54:10,990
Kull dritt, hekk IKOLLOK versus POST,
dawn huma l-żewġ modi prinċipali

1150
00:54:10,990 --> 00:54:14,880
li aħna jgħaddu data talba HTTP.

1151
00:54:14,880 --> 00:54:17,370
You guys għandu raw
kemm ta 'dawn nisperaw.

1152
00:54:17,370 --> 00:54:20,940
Allura ma IKOLLOK, l-informazzjoni
huwa mgħoddi mill-URL.

1153
00:54:20,940 --> 00:54:23,490
Mela jekk inti qatt do Google
tfittxijiet, YouTube, inti ser

1154
00:54:23,490 --> 00:54:25,130
probabbilment Avviż xi kwistjoni mark.

1155
00:54:25,130 --> 00:54:28,230
U mbagħad, il-kliem kollha
li inti biss jitqiegħed fil hemmhekk.

1156
00:54:28,230 --> 00:54:31,410
U POST jgħaddi d-data
fil-ġisem messaġġ HTTP.

1157
00:54:31,410 --> 00:54:36,922
Allura b'differenza IKOLLOK, inti tip ta 'tikkonsidra
li d-data hija moħbija mill-utent.

1158
00:54:36,922 --> 00:54:38,630
Imma x'hemm verament
importanti li wieħed jifhem

1159
00:54:38,630 --> 00:54:44,040
hija li dan għadu
daqstant siguri bħala IKOLLOK.

1160
00:54:44,040 --> 00:54:48,780
L-analoġija I simili għall-użu hija jekk
għandek numru tiegħek kont bankarju

1161
00:54:48,780 --> 00:54:52,795
u inti tikteb fuq barra ta '
envelop, li pjuttost perikolużi.

1162
00:54:52,795 --> 00:54:55,920
Jekk ġejt biex tiktibha fuq biċċa tal-
karta u poġġih ġewwa l-pakkett,

1163
00:54:55,920 --> 00:54:58,850
huwa għadu tassew sikuri għaliex
kull ma għandek tagħmel huwa tiftaħ li sa

1164
00:54:58,850 --> 00:55:03,480
u ħarsa lejn l-kontenuti attwali
tal-messaġġ biex tara li.

1165
00:55:03,480 --> 00:55:08,310
Allura dan huwa "moħbija," u nies bħal biex
think it'sa sigura, imma huwa verament mhux.

1166
00:55:08,310 --> 00:55:11,000
U jien ċert Davin se
jsibu rwieħhom li aktar, forsi.

1167
00:55:11,000 --> 00:55:12,850
Iżda huwa importanti
distinzjoni li tagħmel

1168
00:55:12,850 --> 00:55:15,820
u xi ħaġa verament tajba biex jifhmu.

1169
00:55:15,820 --> 00:55:19,220
>> OK, SQL, Structured Mistoqsija Lingwa.

1170
00:55:19,220 --> 00:55:22,220
Kollha l-għalf li
Rajna hekk reċentement!

1171
00:55:22,220 --> 00:55:25,400
Allura huwa bażikament biss ddisinjati,
ovvjament, għall-ġestjoni tad-data.

1172
00:55:25,400 --> 00:55:30,560
You guys kellhom ħafna esperjenza mal-
dan tabelli tiegħek ma MyAdmin PHP.

1173
00:55:30,560 --> 00:55:34,100
U hemm erba mistoqsijiet komuni
li irridu li inti guys taf.

1174
00:55:34,100 --> 00:55:37,304
Allura hemm aġġornament, daħħal,
tagħżel, u ħassar.

1175
00:55:37,304 --> 00:55:38,970
Sabiex tagħmel żgur li int taf dawk verament tajjeb.

1176
00:55:38,970 --> 00:55:40,960
Aħna qed tmur biex jmorru
permezz tagħhom verament mgħaġġel.

1177
00:55:40,960 --> 00:55:44,340
>> Allura taġġorna, verament, bħal dak li
inti tista 'taħseb dan huwa minnu,

1178
00:55:44,340 --> 00:55:46,740
hija biss jaġġorna d-data fid-database tiegħek.

1179
00:55:46,740 --> 00:55:48,750
Allura aħna għandna xi eżempju hawn.

1180
00:55:48,750 --> 00:55:53,310
Dan huwa l-ġenerali
istruttura ta 'mistoqsija aġġornament.

1181
00:55:53,310 --> 00:55:56,150
Allura aħna aġġornata t-tabella
li aħna qed jitkellem dwar.

1182
00:55:56,150 --> 00:56:00,520
U aħna rridu li jistabbilixxu ċerta
valuri, ċerti kolonni

1183
00:56:00,520 --> 00:56:02,600
ugwali għall-valuri speċifiċi.

1184
00:56:02,600 --> 00:56:07,500
Allura dan biss taġġorna l-tabella, li qed jinbidlu
Valuri fir-ringieli kollha f'dan il-każ.

1185
00:56:07,500 --> 00:56:13,690
Allura f'dan il-wieħed stabbiliti hawn, l-attwali
eżempju, għandna insert-- sorry.

1186
00:56:13,690 --> 00:56:17,630
Li slide avvanzati
mingħajr me twettiq tiegħu.

1187
00:56:17,630 --> 00:56:22,230
>> Allura din it-tabella aġġornamenti sett col1 ugwali
li val1 fejn house ugwali "Currier."

1188
00:56:22,230 --> 00:56:25,300
X'inhu dan wieħed ma huwa
tbiddel biss, biss

1189
00:56:25,300 --> 00:56:28,130
jaġġorna dawn il-valuri fil-postijiet speċifiċi.

1190
00:56:28,130 --> 00:56:32,300
Allura f'dan l-ewwel wieħed, tbiddel dawn
valuri għall kollox fit-tabella tiegħek,

1191
00:56:32,300 --> 00:56:32,860
OK?

1192
00:56:32,860 --> 00:56:35,820
Huwa ser tbiddel dan
kolonna għal kull dħul wieħed,

1193
00:56:35,820 --> 00:56:37,020
għal kull ringiela waħda.

1194
00:56:37,020 --> 00:56:40,840
Iżda dan fejn, inti tista '
jaħsbu li bħala li tikkwalifika.

1195
00:56:40,840 --> 00:56:44,020
Allura huwa biss se jibdlu
fil-postijiet speċifiċi ħafna.

1196
00:56:44,020 --> 00:56:47,840
Għalhekk fl-p sett seba, meta inti
forsi aġġornata l-ammont ta 'flus kontanti

1197
00:56:47,840 --> 00:56:53,050
dak l-utent tiegħek kellhom, inti probabilment kellha
xi fejn ID ugwali sessjoni ID, id-dritt?

1198
00:56:53,050 --> 00:56:55,280
>> Għaliex inti ma tridx li
jibdlu l-ammont ta 'flus kontanti

1199
00:56:55,280 --> 00:56:57,630
għal kull persuna li
kienet qed tuża website tiegħek.

1200
00:56:57,630 --> 00:57:00,480
Inti ridt biex jibdlu għal wieħed
persuna speċifika, dik il-persuna li tkun

1201
00:57:00,480 --> 00:57:02,410
min kien jużawha dak iż-żmien.

1202
00:57:02,410 --> 00:57:04,320
Dritt?

1203
00:57:04,320 --> 00:57:07,510
OK, so daħħal, daħħal
ċerti valuri fis tabelli.

1204
00:57:07,510 --> 00:57:11,650
Dan huwa simili meta int
ħolqien ta 'utent ġdid fjamant.

1205
00:57:11,650 --> 00:57:14,240
L-istruttura ġenerali hawn
huwa daħħal fis x'ikun it-tabella

1206
00:57:14,240 --> 00:57:15,680
aħna qed jitkellem dwar.

1207
00:57:15,680 --> 00:57:18,910
Valuri, li huma l-valuri li
aħna fil-fatt tixtieq li daħħal.

1208
00:57:18,910 --> 00:57:23,060
OK, hekk kif naraw hawn, aħna
jkunu daħħal fis-mejda.

1209
00:57:23,060 --> 00:57:27,790
Dan huwa kolonni speċifiċi mal-
Valuri jikkorrispondi tagħhom.

1210
00:57:27,790 --> 00:57:29,940
Allura dan jgħid, daħħal
ringiela ġdid li jkun fih

1211
00:57:29,940 --> 00:57:33,660
Valuri val1 u val2 taħt
dawn il-kolonni speċifiċi.

1212
00:57:33,660 --> 00:57:39,240
>> Allura forsi inti biss trid timla
out nofs l-affarijiet f'dan il-filliera.

1213
00:57:39,240 --> 00:57:41,150
Dak hu li din il-parti hawn ihallik tagħmel.

1214
00:57:41,150 --> 00:57:43,280
Hija ihallik attwalment
jiddeterminaw liema parti.

1215
00:57:43,280 --> 00:57:44,244
Iva?

1216
00:57:44,244 --> 00:57:52,150
>> UDJENZA: Can You biss [inaudible]
ċelloli fil-filliera [inaudible]?

1217
00:57:52,150 --> 00:57:55,000
>> Alison: Jekk inti biss timla
ċerti partijiet tar-ringiela tiegħek,

1218
00:57:55,000 --> 00:57:57,480
il-bqija ta 'dawk iċ-ċelluli huma biss vojta.

1219
00:57:57,480 --> 00:58:02,730

1220
00:58:02,730 --> 00:58:05,660
Sakemm inti jippermettulhom li
jkunu vojta, mhuwiex problema.

1221
00:58:05,660 --> 00:58:09,570
Jekk inti tipprova l-aċċess għalihom, huwa
ser jirritorna xi element vojta.

1222
00:58:09,570 --> 00:58:13,850
Iżda huwa importanti li tkun taf
li f'ċerti tabelli,

1223
00:58:13,850 --> 00:58:16,690
dawn għandhom jitħallew null.

1224
00:58:16,690 --> 00:58:18,890
Inti jista 'jkollok run ġo
problema matul tiegħek p-sett

1225
00:58:18,890 --> 00:58:21,320
għaliex aħna ma let xi
tal-valuri tiegħek tkun nulla.

1226
00:58:21,320 --> 00:58:26,110
Iżda int tista 'tispeċifika l-
valur fakultattiv fit-tabella tiegħek.

1227
00:58:26,110 --> 00:58:29,640
>> OK, tagħżel, għalhekk dan huwa
biss mod ta 'jkollna

1228
00:58:29,640 --> 00:58:33,790
data speċifiċi minn tabella fil
xi identifikatur li inti tixtieq.

1229
00:58:33,790 --> 00:58:37,990
Star Mela agħżel mit-tabella fejn
col ugwali ħaġa ifisser biss,

1230
00:58:37,990 --> 00:58:43,820
tagħti me-data kollha assoċjati
fejn din il-kolonna speċifiku huwa veru.

1231
00:58:43,820 --> 00:58:49,020
Allura l-istilla f'dan il-każ se
jirritorna l-ringiela kollha li inti, OK?

1232
00:58:49,020 --> 00:58:54,880
>> U mbagħad, f'dan il-każ, tagħżel star minn
tabella biss jagħtik l-tabella sħiħa.

1233
00:58:54,880 --> 00:58:58,940
U mbagħad, iħassru ovvjament, hija biss
tħassar il-filliera mit-tabella.

1234
00:58:58,940 --> 00:59:01,320
Allura tħassar mit-tabella,
ikun x'ikun it-tabella aħna qed

1235
00:59:01,320 --> 00:59:06,830
referenzar, fejn xi speċifiku
identifikatur jew xi kondizzjoni hija vera.

1236
00:59:06,830 --> 00:59:07,720
Iva?

1237
00:59:07,720 --> 00:59:08,700
>> UDJENZA: Mistoqsija.

1238
00:59:08,700 --> 00:59:10,699
Għaliex huma inti tuża double
kwotazzjonijiet, u jekk inti

1239
00:59:10,699 --> 00:59:13,600
do kwotazzjonijiet doppja jew wieħed
kwotazzjonijiet, ma tagħmel differenza?

1240
00:59:13,600 --> 00:59:18,235
>> Alison: kwotazzjonijiet doppja jew kwotazzjonijiet uniku
ma tagħmilx differenza fil SQL.

1241
00:59:18,235 --> 00:59:19,610
Ħsibt I raw mistoqsija oħra.

1242
00:59:19,610 --> 00:59:20,814
Iva?

1243
00:59:20,814 --> 00:59:25,070
>> UDJENZA: Ma taffettwa liema
gets ħarbet mill-query?

1244
00:59:25,070 --> 00:59:27,945
>> Alison: Rob?

1245
00:59:27,945 --> 00:59:31,410
>> ROB: What do you jfisser minn
ħarbet mill-query?

1246
00:59:31,410 --> 00:59:36,870
>> UDJENZA: Jekk xi ħadd ikollu
mistoqsija waħda fil-forma of--

1247
00:59:36,870 --> 00:59:39,862
>> ROB: Jekk xi ħadd kellu
tpoġġi kwotazzjoni waħda fil,

1248
00:59:39,862 --> 00:59:43,560
imbagħad sakemm int sanitizing
input tiegħek, allura ma jimpurtax.

1249
00:59:43,560 --> 00:59:46,205
Imma jekk inti qed tuża wieħed
kwotazzjoni u int żbaljat

1250
00:59:46,205 --> 00:59:47,914
jaħarbu inputs tiegħek,
allura iva, dawn jeħtieġu

1251
00:59:47,914 --> 00:59:51,079
li jitqiegħed kwotazzjoni waħda sabiex titkisser
kodiċi tiegħek. jekk inti tuża kwotazzjonijiet doppja,

1252
00:59:51,079 --> 00:59:53,580
dawn jeħtieġu li jitqiegħed doppja
nikkwota li jiksru kodiċi tiegħek.

1253
00:59:53,580 --> 00:59:56,163
Iżda sakemm inti jaħarbu affarijiet
korrett, ma jimpurtax.

1254
00:59:56,163 --> 00:59:59,220
Huwa biss se jiġu tradotti
mas-simbolu korretta xorta waħda.

1255
00:59:59,220 --> 01:00:02,332
>> UDJENZA: X'tagħmel ħarba jfisser?

1256
01:00:02,332 --> 01:00:04,040
Alison: Well, bħal
sanitizing u ħarba.

1257
01:00:04,040 --> 01:00:06,810

1258
01:00:06,810 --> 01:00:13,820
L-eżami li għandna, il XKCD kbir
komiks li huma pull up fejn inti għandek,

1259
01:00:13,820 --> 01:00:15,629
oh--

1260
01:00:15,629 --> 01:00:16,670
ROB: Hu l-aħħar slide.

1261
01:00:16,670 --> 01:00:18,500
Alison: Hu l-aħħar slide, tassew?

1262
01:00:18,500 --> 01:00:20,200
Oh my god.

1263
01:00:20,200 --> 01:00:21,780
Hemm immorru, perfetta.

1264
01:00:21,780 --> 01:00:27,900
OK, hekk bażikament, inti tista 'tinjetta
xi ħaġa fis dan query SQL

1265
01:00:27,900 --> 01:00:30,560
fejn pawżi tiegħek
kodiċi, jew bħala David wera

1266
01:00:30,560 --> 01:00:38,460
fil-klassi, jekk ikollna xi waħda
quote 1 huwa ugwali 1 u jekk fil-kodiċi tagħna,

1267
01:00:38,460 --> 01:00:41,230
aħna biss direttament kopja li fi, u
għandna quote waħda jispiċċa,

1268
01:00:41,230 --> 01:00:44,740
dak li jiġri huwa nikbru
xi espressjoni li

1269
01:00:44,740 --> 01:00:48,680
jevalwa l veru li se
let xi ħadd jidħol database tagħna

1270
01:00:48,680 --> 01:00:51,720
u tikseb data li aħna
Ma rridx li tikseb.

1271
01:00:51,720 --> 01:00:54,240
Allura sanitizing l-inputs
ifisser biss li tagħmel ċert

1272
01:00:54,240 --> 01:00:57,680
li aħna qed jaħrab dawn
karattri u li tinnomina minnhom

1273
01:00:57,680 --> 01:01:01,720
kif Chars u mhux affarijiet
li għandhom ikunu permessi

1274
01:01:01,720 --> 01:01:04,990
sabiex jittieħdu litteralment
kif istqarrija SQL tagħna.

1275
01:01:04,990 --> 01:01:09,980
>> Allura l-ħaġa kbira li għidna
li inti guys għandha tkun li jużaw

1276
01:01:09,980 --> 01:01:13,650
kienu Chars speċjali HTML,
li hija xi ħaġa

1277
01:01:13,650 --> 01:01:15,730
li inti tista 'tixtieq li tagħti ħarsa lejn.

1278
01:01:15,730 --> 01:01:17,240
OK, iħassru.

1279
01:01:17,240 --> 01:01:19,450
Tipi ta 'data, dan kollu se jkun online.

1280
01:01:19,450 --> 01:01:23,510
Peress li aħna għandna 15-il minuta xellug, jien
biss se jmorru dritt permezz ta 'dan.

1281
01:01:23,510 --> 01:01:28,500
PHP u SQL, bażikament dan huwa
biss kellna funzjoni query li

1282
01:01:28,500 --> 01:01:31,520
għen jipproteġu kontra
dawn l-attakki malizzjużi.

1283
01:01:31,520 --> 01:01:33,970
Allura kull meta inti tuża
query, konna jagħmlu ċert

1284
01:01:33,970 --> 01:01:36,560
li l-affarijiet kienu sanitizzati u whatnot.

1285
01:01:36,560 --> 01:01:41,070
>> MVC huwa biss paradigma disinn,
hekk mudell, il-fehma, kontrollur.

1286
01:01:41,070 --> 01:01:44,200
Huwa biss mod li żżomm affarijiet
sbieħ u maqsuma bl-istess mod

1287
01:01:44,200 --> 01:01:47,100
li għandna t-tendenza għall-fattur
kodiċi barra fil-funzjonijiet.

1288
01:01:47,100 --> 01:01:53,390
Dan huwa biss qafas disinn web
li jippermetti li inti tagħmel l-istess ħaġa.

1289
01:01:53,390 --> 01:01:54,760
Jien ser skip dan.

1290
01:01:54,760 --> 01:01:58,530
>> Din hija xi ħaġa li jien
Ikun super comfy ma.

1291
01:01:58,530 --> 01:02:01,132
Huwa ftit tabella kbira hemmhekk.

1292
01:02:01,132 --> 01:02:03,090
Dan jagħtik l-funzjoni
Eżempju tal-mudell.

1293
01:02:03,090 --> 01:02:05,473
Jien biss jmorru permezz ta 'dan minħabba I
verament tixtieq Davin li tkun kapaċi jitkellmu.

1294
01:02:05,473 --> 01:02:07,140
Jekk għandek xi mistoqsijiet,
nitolbok li tħossok liberu.

1295
01:02:07,140 --> 01:02:07,931
I ser tkun hawn wara.

1296
01:02:07,931 --> 01:02:10,360
Just come tkellem lili.

1297
01:02:10,360 --> 01:02:13,380
Ma 'dak, aħna għandna status HTTP.

1298
01:02:13,380 --> 01:02:16,270
U l Davin għaddej biex blow
permezz ta 'dan fil-15 minuta.

1299
01:02:16,270 --> 01:02:17,560
Dan se jkun kbir.

1300
01:02:17,560 --> 01:02:18,893
>> Davin: OK.

1301
01:02:18,893 --> 01:02:20,312
Uh, mic tiegħek?

1302
01:02:20,312 --> 01:02:22,210
Yeah.

1303
01:02:22,210 --> 01:02:23,336
Jiddispjacini.

1304
01:02:23,336 --> 01:02:24,460
Alison: Way li jiġu ppreparati.

1305
01:02:24,460 --> 01:02:25,335
Davin: Le, jien lest.

1306
01:02:25,335 --> 01:02:25,860
Jien lest.

1307
01:02:25,860 --> 01:02:28,790
Ejja nagħmlu dan.

1308
01:02:28,790 --> 01:02:29,290
Huwa lest.

1309
01:02:29,290 --> 01:02:30,041
OK.

1310
01:02:30,041 --> 01:02:30,540
Jiddispjacini.

1311
01:02:30,540 --> 01:02:31,664
I mxerrda kafè fuq myself.

1312
01:02:31,664 --> 01:02:36,037

1313
01:02:36,037 --> 01:02:38,210
I do not know jekk jien aktar
mqalleb li nħares iblah,

1314
01:02:38,210 --> 01:02:40,600
jew li jien ma jkollhom kafè aktar.

1315
01:02:40,600 --> 01:02:44,480
Xorta waħda, biss tħabbira quick
dwar il-karta tal inti guys jkollhom.

1316
01:02:44,480 --> 01:02:47,994
Allura din il-folja għandek guys għandek mhix
l-uffiċjal x'hemm fuq l-kwizz.

1317
01:02:47,994 --> 01:02:49,660
Dan huwa l-uffiċjal x'hemm fuq l-kwizz.

1318
01:02:49,660 --> 01:02:52,520
Ukoll, fuq il-websajt, we tell
inti, OK, dan se jkun fuq l-kwizz.

1319
01:02:52,520 --> 01:02:55,020
Allura fil-folja iqarrqu ftit
għandek, mhux uffiċjali.

1320
01:02:55,020 --> 01:02:56,690
U hemm żbalji fuqha.

1321
01:02:56,690 --> 01:03:01,490
Allura l-aħjar mhux biss bl-addoċċ jużawh.

1322
01:03:01,490 --> 01:03:04,390
Allura yeah, li li.

1323
01:03:04,390 --> 01:03:05,980
Mela ejja tikseb fis dan malajr reali.

1324
01:03:05,980 --> 01:03:07,420
>> Allura istatus HTTP.

1325
01:03:07,420 --> 01:03:10,430
Allura x'jiġri meta l-
website, kollox hija id-dritt.

1326
01:03:10,430 --> 01:03:11,144
OK Kollox tal-.

1327
01:03:11,144 --> 01:03:13,310
Kollox taqa 'lura għall-
inti l-mod inti tixtieq li.

1328
01:03:13,310 --> 01:03:15,370
Ikollok 200 OK.

1329
01:03:15,370 --> 01:03:19,250
301, fejn rajna li 301 qabel?

1330
01:03:19,250 --> 01:03:20,890
Stenna, x'hemm up?

1331
01:03:20,890 --> 01:03:23,250
Jiddispjacini.

1332
01:03:23,250 --> 01:03:24,980
Rajna lecture landa i waqt sigurtà.

1333
01:03:24,980 --> 01:03:30,690
Allura waqt is-sigurtà, hekk jekk David ittajpjat fil
http u mbagħad ippruvaw biex tmur cs50.net,

1334
01:03:30,690 --> 01:03:31,940
int ser tara 301 mċaqalqa.

1335
01:03:31,940 --> 01:03:32,440
Għaliex?

1336
01:03:32,440 --> 01:03:35,570
Minħabba li għaddej biex idawwru
inti awtomatikament biex HTTPS tagħna.

1337
01:03:35,570 --> 01:03:38,649
>> Allura 301 mċaqalqa, kemm huwa
bażikament ridirezzjoni.

1338
01:03:38,649 --> 01:03:40,190
U inti tista 'taħseb dwar dan bħal dan.

1339
01:03:40,190 --> 01:03:43,790
Kwalunkwe mill-istati li jibdew bil għamilhom 2,
dawk huma simili, OK, OK kollox ta.

1340
01:03:43,790 --> 01:03:46,530
Kwalunkwe mill-istati li jibdew
bi 3, dawk huma ridirezzjoni.

1341
01:03:46,530 --> 01:03:49,571
Statuses li tibda bil 4, li l-mezzi
hemm xi tip ta 'żball klijent.

1342
01:03:49,571 --> 01:03:52,440
Statuses li jibdew bi 5,
thats xi tip ta 'żball server.

1343
01:03:52,440 --> 01:03:54,680
Allura inti tip ta 'ikissru
l-istatus bħal dik.

1344
01:03:54,680 --> 01:03:59,120
Allura 304 mhux mhux modifikati, hekk fil tiegħek
server.c p-settijiet, so ejja ngħidu li inti

1345
01:03:59,120 --> 01:04:00,600
cat.html mgħobbija.

1346
01:04:00,600 --> 01:04:03,360
Kollox ġej lura,
ikollok 200s, OK, kbir.

1347
01:04:03,360 --> 01:04:04,540
>> Ejja ngħidu li inti aggornata dan.

1348
01:04:04,540 --> 01:04:07,310
Ukoll, ġewwa dak
cat.html, inti għandek JPEG.

1349
01:04:07,310 --> 01:04:09,520
Ukoll, li JPEG mhuwiex
se tikseb tagħbija mill-ġdid.

1350
01:04:09,520 --> 01:04:12,140
Int mhux ser post ieħor
IKOLLOK talba lis-server,

1351
01:04:12,140 --> 01:04:13,980
u mbagħad jiksbu dak kollu li l-informazzjoni lura.

1352
01:04:13,980 --> 01:04:17,560
Huwa ser biss be-- li l-immaġni hija
ser jiġu Cached fuq magna tiegħek.

1353
01:04:17,560 --> 01:04:19,540
U hekk li l-immaġni se jkun 304.

1354
01:04:19,540 --> 01:04:20,720
Allura huwa ma ġiex immodifikat.

1355
01:04:20,720 --> 01:04:24,600
Jekk inti mbagħad mill-qrib out, ċar
cookies, u mbagħad jġedded

1356
01:04:24,600 --> 01:04:27,490
u jippruvaw biex tagħbija dik il-paġna
għal darb'oħra, int ser tara 200s.

1357
01:04:27,490 --> 01:04:28,910
Int mhux ser tara li 304.

1358
01:04:28,910 --> 01:04:32,340
>> 400, it-talba bad, reali
quick, bħal jekk inti

1359
01:04:32,340 --> 01:04:34,880
kienu se tibgħat
JSON oġġett lis-server

1360
01:04:34,880 --> 01:04:38,090
u l-għan JSON tiegħek kienet żbaljata,
tkun taf tara xi ħaġa bħal dik.

1361
01:04:38,090 --> 01:04:39,000
403, projbit.

1362
01:04:39,000 --> 01:04:40,330
Meta kieku inti tara projbit?

1363
01:04:40,330 --> 01:04:41,394
Probabbilment Probabbilment?

1364
01:04:41,394 --> 01:04:42,060
UDJENZA: chmod.

1365
01:04:42,060 --> 01:04:42,950
Davin: chmod, yeah.

1366
01:04:42,950 --> 01:04:44,730
Allura inti ma stabbilixxewx
permessi korrett.

1367
01:04:44,730 --> 01:04:45,577
404, ma nstabx.

1368
01:04:45,577 --> 01:04:46,410
Huwa biss ma jkunx hemm.

1369
01:04:46,410 --> 01:04:48,670
Mela jekk inti tip fil-URL ħażin.

1370
01:04:48,670 --> 01:04:53,500
500, żball server interna, il-server
probabbilment ma kienx konfigurati b'mod korrett.

1371
01:04:53,500 --> 01:04:56,260
Xi ħaġa mhux fuq il-għan tiegħek, iżda
xi ħaġa fuq in-naħa server.

1372
01:04:56,260 --> 01:04:57,240
U 503?

1373
01:04:57,240 --> 01:04:59,502
A lott ta 'nies raw
503s fl-aħħar p-sett.

1374
01:04:59,502 --> 01:05:00,460
Meta tkun dik jiġri?

1375
01:05:00,460 --> 01:05:04,180

1376
01:05:04,180 --> 01:05:05,660
Smajt whispers.

1377
01:05:05,660 --> 01:05:07,767
>> UDJENZA: Meta Google
jiddeċiedi int robot.

1378
01:05:07,767 --> 01:05:10,350
Davin: Yeah, meta Google jiddeċiedi
int robot, ikollok 503s.

1379
01:05:10,350 --> 01:05:11,560
Allura dak l-eċċess.

1380
01:05:11,560 --> 01:05:14,620
Jekk inti ħadthom mitluba mill-server
wisq, huwa ġeneralment temporanja.

1381
01:05:14,620 --> 01:05:15,560
U ħafna minnkom ndunat dan.

1382
01:05:15,560 --> 01:05:16,185
Allura inti raw 503.

1383
01:05:16,185 --> 01:05:19,282
Inti tista ħadu ftit
break, allura l-503s marru bogħod,

1384
01:05:19,282 --> 01:05:20,490
u kollox kien id-dritt.

1385
01:05:20,490 --> 01:05:26,640
>> Gabe: Real quick, meta ma inti guys nikseb
500 fil probabilment f'dan l-aħħar il-problema iffissati?

1386
01:05:26,640 --> 01:05:27,954
Iva?

1387
01:05:27,954 --> 01:05:30,906
>> UDJENZA: Normalment jekk il-
server ikollu file spustjati

1388
01:05:30,906 --> 01:05:34,650
jew [inaudible] tagħhom
magna [inaudible].

1389
01:05:34,650 --> 01:05:38,870
>> Gabe: Allura jista 'jkun konfigurazzjoni
kwistjoni fil PHP tiegħek fuq server tiegħek.

1390
01:05:38,870 --> 01:05:42,250
Iżda jista 'jkun biss xi ħaġa
bħal punto virgola dik nesa tiegħek.

1391
01:05:42,250 --> 01:05:44,130
Jekk int ittajpjar PHP,
xi sintassi korretta

1392
01:05:44,130 --> 01:05:46,000
inti tista 'tikseb xi ħaġa bħal dik.

1393
01:05:46,000 --> 01:05:46,960
OK?

1394
01:05:46,960 --> 01:05:48,610
>> Davin: Kessaħ.

1395
01:05:48,610 --> 01:05:51,180
Tixtieq lili biex tagħmel biss sa Ajax?

1396
01:05:51,180 --> 01:05:52,950
>> Gabe: [inaudible].

1397
01:05:52,950 --> 01:05:53,450
Davin: OK.

1398
01:05:53,450 --> 01:05:54,230
Allura x'inhu l-DOM?

1399
01:05:54,230 --> 01:05:55,290
X'tagħmel DOM toqgħod għal?

1400
01:05:55,290 --> 01:05:56,990
>> UDJENZA: Dokument mudell oġġett.

1401
01:05:56,990 --> 01:05:57,490
Davin: Nizza.

1402
01:05:57,490 --> 01:06:00,775
U għaliex għandna bhalu?

1403
01:06:00,775 --> 01:06:02,670
Tal-biża.

1404
01:06:02,670 --> 01:06:06,651
Dritt, hekk hija biss jippermetti li l-aċċess
l-HTML, aċċess page tagħna malajr ħafna.

1405
01:06:06,651 --> 01:06:07,150
Għaliex?

1406
01:06:07,150 --> 01:06:09,980
Għaliex aħna qed trattament tagħna
il-paġna, trattament HTML tags tagħna,

1407
01:06:09,980 --> 01:06:11,730
trattament kollox
bħallikieku dawn qed oġġetti.

1408
01:06:11,730 --> 01:06:13,710
Jekk aħna qed jittrattawhom bħal dawn qed
oġġetti, allura x'nistgħu nagħmlu?

1409
01:06:13,710 --> 01:06:15,210
Well, nistgħu sejħa funzjonijiet fuqhom.

1410
01:06:15,210 --> 01:06:16,460
U dan huwa importanti għaliex?

1411
01:06:16,460 --> 01:06:19,200
Well, għaliex aħna qed tmur biex tuża
JavaScript biex taġġorna HTML tagħna,

1412
01:06:19,200 --> 01:06:20,500
taġġorna dawn l-oġġetti.

1413
01:06:20,500 --> 01:06:23,869
Allura jekk aħna jittrattawhom bħal oġġetti,
aħna mbagħad jistgħu jċemplu funzjonijiet fuqhom.

1414
01:06:23,869 --> 01:06:26,660
Jien ser tikseb fis dan ftit
aktar meta mmur fis JavaScript,

1415
01:06:26,660 --> 01:06:30,510
imma inti stajt kollha raw like
document.getElementByID.

1416
01:06:30,510 --> 01:06:32,870
Allura dokument huwa tiegħek
element, nikseb element permezz ID,

1417
01:06:32,870 --> 01:06:35,087
sabiex inti qed tmur biex tħares
għal xi ID fi tag HTML.

1418
01:06:35,087 --> 01:06:36,920
U allura, inti tista 'tagħmel
xi ħaġa oħra għal dan.

1419
01:06:36,920 --> 01:06:40,089
Per eżempju, bħall document.body,
allura inti tista 'tehmeż tfal.

1420
01:06:40,089 --> 01:06:41,630
Allura inti qed tmur biex issib id-dokument.

1421
01:06:41,630 --> 01:06:42,340
Inti għandek id-dokument.

1422
01:06:42,340 --> 01:06:43,629
Inti qed tmur biex isibu l-korp.

1423
01:06:43,629 --> 01:06:44,420
Inti sabu l-ġisem.

1424
01:06:44,420 --> 01:06:46,545
U allura, int ser
sejħa xi funzjoni fuqha.

1425
01:06:46,545 --> 01:06:50,312
Allura tehmeż tfal, u inti tista 'tehmeż
xi HTML fuq it-tmiem ġewwa l-ġisem tiegħek.

1426
01:06:50,312 --> 01:06:52,520
Allura bażikament, int biss
trattat bħal oġġett.

1427
01:06:52,520 --> 01:06:54,515
Inti trattament HTML
tags bħal oġġett.

1428
01:06:54,515 --> 01:06:57,071
U jagħmilha faċli ħafna
u malajr biex jgħaddu minnhom.

1429
01:06:57,071 --> 01:06:59,070
Iżda tippermetti wkoll li inti
li jsejħu funzjonijiet fuqhom

1430
01:06:59,070 --> 01:07:04,410
sabiex inti tista 'timmanipola
u jibdlu l-elementi.

1431
01:07:04,410 --> 01:07:10,162
>> Gabe: Minħabba dan, għaliex huwa JavaScript bħal
lingwa sbieħ li jinteraġixxu ma HTML?

1432
01:07:10,162 --> 01:07:12,870
Odds huma, meta n-nies kienu jagħżlu
il-lingwa għall-browser,

1433
01:07:12,870 --> 01:07:14,990
għall-naħa tal-klijent,
JavaScript huwa tassew sbieħ,

1434
01:07:14,990 --> 01:07:16,765
huwa verament tajba fl-immaniġġjar oġġetti.

1435
01:07:16,765 --> 01:07:20,620
U l-oġġetti huma tip ta 'simili
l-oġġetti li jidhru fil-HTML,

1436
01:07:20,620 --> 01:07:23,940
hekk huwa faċli ħafna għall JavaScript
biex tagħmel dan it-tip ta 'tqandil.

1437
01:07:23,940 --> 01:07:24,440
Davin: Nizza.

1438
01:07:24,440 --> 01:07:25,670
Allura hawnhekk biss eżempju.

1439
01:07:25,670 --> 01:07:29,020
So I think fuq kwizz sena li għaddiet,
jew forsi sentejn ilu, aħna

1440
01:07:29,020 --> 01:07:30,840
talab li inti toħloq siġra.

1441
01:07:30,840 --> 01:07:32,660
Allura dan huwa eżattament dak li youd tagħmel.

1442
01:07:32,660 --> 01:07:34,255
Allura inti tibda bl dokument.

1443
01:07:34,255 --> 01:07:36,130
U allura inti bażikament
biss ħarsa lejn l-tags.

1444
01:07:36,130 --> 01:07:38,100
Mela jekk inti tfittex, aħna
tibda bil tag HTML.

1445
01:07:38,100 --> 01:07:41,660
U mbagħad, ikollok ħjiel dwar kif
tagħmel dan ibbażati fuq l-indentazzjoni.

1446
01:07:41,660 --> 01:07:43,870
Allura tip kap ta 'fergħat off.

1447
01:07:43,870 --> 01:07:46,242
Ġewwa ras, għandna
tag ieħor għat-titolu.

1448
01:07:46,242 --> 01:07:47,450
Mela allura, aħna għandna titolu tag.

1449
01:07:47,450 --> 01:07:49,760
U ġewwa dan, aħna għandna xi string.

1450
01:07:49,760 --> 01:07:52,210
U hekk aħna nirrappreżentaw
string f'ċirku.

1451
01:07:52,210 --> 01:07:54,010
U l-tags huma fil-pjazez.

1452
01:07:54,010 --> 01:07:56,270
>> U jekk inti tfittex, jekk aħna
think ta 'dan bħala siġra,

1453
01:07:56,270 --> 01:07:58,730
u ejja ngħidu li HTML huwa
ġenitur, allura ras u l-ġisem

1454
01:07:58,730 --> 01:07:59,772
ser ikunu aħwa.

1455
01:07:59,772 --> 01:08:01,813
Huma qed kemm se tkun
tfal ta 'dak il-ġenitur.

1456
01:08:01,813 --> 01:08:03,620
Allura għaliex qed
kemm aħwa, dawn qed

1457
01:08:03,620 --> 01:08:06,590
se jkun it-tip ta 'li jmiss biex
xulxin fil-mudell siġra tagħna.

1458
01:08:06,590 --> 01:08:08,590
U allura, inti bażikament
jagħmlu l-istess ħaġa eżatt.

1459
01:08:08,590 --> 01:08:13,512
Allura mhux diffiċli, iżda aħna għandna mitluba
mistoqsijiet bħal dan qabel fuq l-kwizz.

1460
01:08:13,512 --> 01:08:15,220
Gabe: Does xi ħadd
xi mistoqsijiet s'issa?

1461
01:08:15,220 --> 01:08:16,357
Huwa tajjeb?

1462
01:08:16,357 --> 01:08:16,856
Davin: Kessaħ.

1463
01:08:16,856 --> 01:08:19,630

1464
01:08:19,630 --> 01:08:21,600
JavaScript, OK, l-għalf tajba.

1465
01:08:21,600 --> 01:08:24,069
Allura JavaScript, x'inhu JavaScript?

1466
01:08:24,069 --> 01:08:28,370
Ukoll, JavaScript is-- huwa
ikkumplikat, iżda dawn

1467
01:08:28,370 --> 01:08:30,727
huma wħud mill-punti ewlenin
li inti għandu jżomm f'moħħu.

1468
01:08:30,727 --> 01:08:31,810
L-ewwel nett, huwa laxk ittajpjat.

1469
01:08:31,810 --> 01:08:33,529
Dak ma jfisser?

1470
01:08:33,529 --> 01:08:35,596
Allura PHP was-- yeah, x'hemm up?

1471
01:08:35,596 --> 01:08:39,854
>> UDJENZA: Inti ma għandekx espliċitu
istat liema tip ta 'varjabbli huwa.

1472
01:08:39,854 --> 01:08:40,479
Davin: Perfect.

1473
01:08:40,479 --> 01:08:43,270
Hekk hu qal inti ma għandekx
espliċitament jindikaw it-tip ta 'varjabbli.

1474
01:08:43,270 --> 01:08:44,160
Dan huwa eżattament id-dritt.

1475
01:08:44,160 --> 01:08:49,700
Għalhekk fl C, jekk kelli int i ugwali 50,
imbagħad fil-PHP, huwa biss bħal dan, $ i,

1476
01:08:49,700 --> 01:08:50,550
ugwali 50.

1477
01:08:50,550 --> 01:08:54,319
Imbagħad fl JavaScript,
dak li l-sejħa tkun?

1478
01:08:54,319 --> 01:08:55,260
Var, id-dritt?

1479
01:08:55,260 --> 01:08:56,566
Hija d jkun simili i var ugwali 50.

1480
01:08:56,566 --> 01:08:58,649
Imma inti ma għandekx tkun
simili, OK, dan huwa int.

1481
01:08:58,649 --> 01:09:00,350
OK, dan huwa string.

1482
01:09:00,350 --> 01:09:01,731
Ebda ħtieġa biex tagħmel dan.

1483
01:09:01,731 --> 01:09:02,939
Huwa ta 'lingwa interpretat.

1484
01:09:02,939 --> 01:09:04,904
Allura dak ma jfisser?

1485
01:09:04,904 --> 01:09:06,340
>> UDJENZA: Mhux kkompilata.

1486
01:09:06,340 --> 01:09:10,470
>> Davin: Liema ma ikkompilati jfisser?

1487
01:09:10,470 --> 01:09:11,392
Yeah?

1488
01:09:11,392 --> 01:09:15,336
>> UDJENZA: Inti ma għandekx
li jirristrutturaw il-kodiċi

1489
01:09:15,336 --> 01:09:18,294
biex tiksbu lest għall
l-kompjuter biex run.

1490
01:09:18,294 --> 01:09:23,144
Huwa biss meħud fil-ħin ta '
eżekuzzjoni u l-kompjuter [inaudible].

1491
01:09:23,144 --> 01:09:25,560
Davin: Yeah, hekk li għaddej biex
jgħaddu interpretu.

1492
01:09:25,560 --> 01:09:26,750
Imma int eżattament id-dritt.

1493
01:09:26,750 --> 01:09:28,319
Allura int qatt ser
li josservawha, id-dritt?

1494
01:09:28,319 --> 01:09:30,399
Meta inti kienu qed jagħmlu tiegħek
PHP u JavaScript kodiċi,

1495
01:09:30,399 --> 01:09:31,365
int qatt ma imsejħa jikkompilaw.

1496
01:09:31,365 --> 01:09:33,779
Inti qatt ma imsejħa xi ħaġa bħal
jagħmlu jew xi ħaġa bħal dik.

1497
01:09:33,779 --> 01:09:34,800
Dak għax huwa interpretat.

1498
01:09:34,800 --> 01:09:37,319
Allura kull darba li tmur permezz browser,
din tmur permezz ta 'interpretu.

1499
01:09:37,319 --> 01:09:40,370
U li għaddej biex tinterpreta lilha
biss fil-ħin reali dritt bogħod għalik.

1500
01:09:40,370 --> 01:09:43,770
Allura liema huma xi pożittivi u negattivi
li jkun hemm lingwa interpretat

1501
01:09:43,770 --> 01:09:45,258
u li jkollhom lingwa kkompilata?

1502
01:09:45,258 --> 01:09:48,240

1503
01:09:48,240 --> 01:09:50,540
Allura compiling-- yeah, x'hemm up?

1504
01:09:50,540 --> 01:09:52,444
>> UDJENZA: Interpretat hija aktar baxxa.

1505
01:09:52,444 --> 01:09:53,319
Davin: F'liema sens?

1506
01:09:53,319 --> 01:09:57,167

1507
01:09:57,167 --> 01:09:59,091
>> UDJENZA: Wara li inti
jikkompilaw, inti ma għandekx

1508
01:09:59,091 --> 01:10:04,400
biex tagħmel xi passi addizzjonali biex tesegwixxi
dan, billi din [inaudible].

1509
01:10:04,400 --> 01:10:05,570
>> Davin: Dritt, perfetta.

1510
01:10:05,570 --> 01:10:08,386
Allura dak li qal hu
bażikament dak kumpilazzjoni,

1511
01:10:08,386 --> 01:10:10,760
meta inti tiġbor, inti għandek
lott ta 'l-ispejjeż bil-quddiem, id-dritt?

1512
01:10:10,760 --> 01:10:11,760
Int ser josservawha.

1513
01:10:11,760 --> 01:10:13,750
Iżda wara li inti josservawha, il-
kompilatur għaddej biex jottimizzaw lilha.

1514
01:10:13,750 --> 01:10:14,840
Huwa ser tkun rapida.

1515
01:10:14,840 --> 01:10:16,170
Huwa ser bażikament
jkun mgħaġġel kemm jista 'jkun.

1516
01:10:16,170 --> 01:10:18,830
Bil-interpretazzjoni, int qatt ma
jkollu dik ispiża bil-quddiem.

1517
01:10:18,830 --> 01:10:22,260
Pjuttost, huwa għaddej biex tkun kemmxejn aktar kajmana
kull wieħed ħin inti tinterpreta dan.

1518
01:10:22,260 --> 01:10:24,940
U int se jkollhom
tinterpreta dan kull wieħed ħin.

1519
01:10:24,940 --> 01:10:27,114
Allura minflok li din
ispiża ta 'darba, issa int

1520
01:10:27,114 --> 01:10:29,530
ser ikollhom tinterpreta lilha
kull darba li l-paġna jirrendi.

1521
01:10:29,530 --> 01:10:31,890
>> Allura interpreti huma tajba għaliex
inti ma għandekx li josservawha,

1522
01:10:31,890 --> 01:10:33,980
iżda dawn qed ħażina fil li kull
żmien il-tagħbijiet paġna, huwa

1523
01:10:33,980 --> 01:10:35,771
ser ikollhom
jinterpretaw dan JavaScript.

1524
01:10:35,771 --> 01:10:40,520
U li għaddej biex imexxu kemmxejn aktar kajmana
milli kieku inti kienu li josservawha.

1525
01:10:40,520 --> 01:10:43,044
Jippermettilek li communicate-- oh, stenna.

1526
01:10:43,044 --> 01:10:44,960
Użati biex jimmanipulaw il-
kontenut u d-dehra.

1527
01:10:44,960 --> 01:10:46,043
Aħna biss tkellem dwar dan.

1528
01:10:46,043 --> 01:10:47,250
Hija tuża l-DOM.

1529
01:10:47,250 --> 01:10:49,930
Ajax, aħna ser jsibu rwieħhom
Ajax fi ftit.

1530
01:10:49,930 --> 01:10:51,520
U allura, huwa naħa tal-klijent.

1531
01:10:51,520 --> 01:10:53,110
Allura PHP huwa server sekondarji.

1532
01:10:53,110 --> 01:10:54,360
JavaScript huwa naħa tal-klijent.

1533
01:10:54,360 --> 01:10:57,780
Liema huma pożittivi għal dak?

1534
01:10:57,780 --> 01:10:58,280
Hija tgħid dan.

1535
01:10:58,280 --> 01:11:01,480

1536
01:11:01,480 --> 01:11:02,780
Huwa aktar mgħaġġla, id-dritt?

1537
01:11:02,780 --> 01:11:05,282
Għaliex inti ma għandekx to-- huwa aktar mgħaġġel.

1538
01:11:05,282 --> 01:11:07,490
Inti ma għandekx biex jikkomunikaw
ma 'xi mezz ieħor.

1539
01:11:07,490 --> 01:11:08,790
Jekk int biss fuq tiegħek
klijent, int qatt ma

1540
01:11:08,790 --> 01:11:11,280
ser ikollhom imorru u
tara x'hemm fuq is-server

1541
01:11:11,280 --> 01:11:13,150
u mbagħad tirrapporta lura
jew xi ħaġa bħal dik.

1542
01:11:13,150 --> 01:11:15,410
Allura naħa tal-klijent tendenza li
tkun xi ftit aktar mgħaġġla.

1543
01:11:15,410 --> 01:11:17,910
>> Gabe: Yeah, iżda dan
ma jfissirx PHP huwa

1544
01:11:17,910 --> 01:11:20,440
aktar mgħaġġel minn JavaScript
jew xi ħaġa ta 'l-like.

1545
01:11:20,440 --> 01:11:23,270
Huma mmexxija tip ta 'fl-istess
veloċità għaliex qed kemm

1546
01:11:23,270 --> 01:11:24,490
lingwi interpretati.

1547
01:11:24,490 --> 01:11:26,680
Il-ħaġa thats kajman
hawnhekk huwa t-talba.

1548
01:11:26,680 --> 01:11:28,870
Allura inti qed attwalment għaddejjin
it-triq kollha fuq l-Brażil

1549
01:11:28,870 --> 01:11:31,460
biex nikseb xi informazzjoni
li jgħix hemm.

1550
01:11:31,460 --> 01:11:34,590
Iżda PHP u JavaScript, huma
tip ta 'run fl-istess veloċità.

1551
01:11:34,590 --> 01:11:37,930
Mhuwiex li wieħed huwa
aktar mgħaġġel mill-oħra.

1552
01:11:37,930 --> 01:11:40,600
Dan, ukoll, mistoqsija trick hawnhekk.

1553
01:11:40,600 --> 01:11:47,338
Allura JavaScript qatt isir
kodiċi magna, vera jew falza?

1554
01:11:47,338 --> 01:11:48,590
>> UDJENZA: Falz.

1555
01:11:48,590 --> 01:11:49,090
Gabe: Falz.

1556
01:11:49,090 --> 01:11:51,298
Hija għandha issir magna
kodiċi għax kodiċi magna hija

1557
01:11:51,298 --> 01:11:53,210
l-unika ħaġa l-magna jifhem.

1558
01:11:53,210 --> 01:11:55,800
Anke jekk mhuwiex ikkompilati,
xorta isir kodiċi magna

1559
01:11:55,800 --> 01:11:59,120
minħabba li l-interpretu huwa biss
programm li jmur linja b'linja

1560
01:11:59,120 --> 01:12:02,170
u jittrasforma dik il-linja fis
ħaġa li l-kompjuter jifhem.

1561
01:12:02,170 --> 01:12:02,825
OK?

1562
01:12:02,825 --> 01:12:03,325
Kessaħ.

1563
01:12:03,325 --> 01:12:08,530

1564
01:12:08,530 --> 01:12:12,890
>> Davin: Hawnhekk huwa biss bażika ħafna
bonjour dinja program JavaScript.

1565
01:12:12,890 --> 01:12:15,590
So I do not know if-- inti stajt tidher dan.

1566
01:12:15,590 --> 01:12:17,630
Imma inti biss għandek HTML hawn.

1567
01:12:17,630 --> 01:12:21,020
U minflok attwalment tqegħid
il JavaScript fil-tags iskrittura,

1568
01:12:21,020 --> 01:12:22,810
hekk youd normalment tqiegħed fil-ras.

1569
01:12:22,810 --> 01:12:24,030
Inti għandek tags iskrittura.

1570
01:12:24,030 --> 01:12:24,870
You qatra hemmhekk.

1571
01:12:24,870 --> 01:12:28,350
Kollha għandna ghamilt hawn qed konna marbuta in--
hekk aħna ve marbuta fil-fajl JavaScript

1572
01:12:28,350 --> 01:12:29,137
bħal dan.

1573
01:12:29,137 --> 01:12:30,470
U inti stajt kollha isir dan, id-dritt?

1574
01:12:30,470 --> 01:12:34,740
Allura meta inti kienu qed jużaw jQuery u
underscore.js fl-aħħar p-sett,

1575
01:12:34,740 --> 01:12:38,700
inti ma għandekx tunnellata ta 'kodiċi fil
tags iskrittura tiegħek, up fir-ras.

1576
01:12:38,700 --> 01:12:41,415
Inti tista 'tagħmel dan, iżda minflok
int biss jorbotha fl.

1577
01:12:41,415 --> 01:12:43,540
U int jorbotha fl
Eżatt bħal inti tagħmel mal CSS.

1578
01:12:43,540 --> 01:12:50,186
Allura hija biss jagħmilha aktar faċli biex jinqara hekk
kodiċi tiegħek mhijiex bħal 1,000 linji twal

1579
01:12:50,186 --> 01:12:52,310
ma 'tunnellati ta' funzjonijiet li
inti tista 'ma tkun tuża.

1580
01:12:52,310 --> 01:12:53,518
>> Minflok, inti biss rabta li hija fil.

1581
01:12:53,518 --> 01:12:55,050
Hija compartmentalizes dan.

1582
01:12:55,050 --> 01:13:00,110
Huwa simili kitba xi fajl header, u
allura inkluż dan il-fajl header fl C.

1583
01:13:00,110 --> 01:13:01,620
Jaħsbu li biss bħal din.

1584
01:13:01,620 --> 01:13:02,680
Allura dak li ma dan do?

1585
01:13:02,680 --> 01:13:04,560
Ukoll, dan se jiddekorri.

1586
01:13:04,560 --> 01:13:05,410
Li għaddej biex twissi lill.

1587
01:13:05,410 --> 01:13:08,020
Allura inti qed tmur biex jiksbu ftit
pop up imsejħa dinja bonjour.

1588
01:13:08,020 --> 01:13:11,420
Quick kwistjoni, check sanità biss,
sabiex inti tara hawn fil-ġisem,

1589
01:13:11,420 --> 01:13:13,160
jgħidu korp, HTML hawn.

1590
01:13:13,160 --> 01:13:14,080
What jiġi l-ewwel?

1591
01:13:14,080 --> 01:13:16,864
Do I see ġisem, HTML hawn,
jew għandi tara l-allert ewwel?

1592
01:13:16,864 --> 01:13:19,828

1593
01:13:19,828 --> 01:13:20,820
>> UDJENZA: Twissija.

1594
01:13:20,820 --> 01:13:21,470
>> Davin: Dritt.

1595
01:13:21,470 --> 01:13:22,110
Hu jgħid allert.

1596
01:13:22,110 --> 01:13:22,610
Għaliex?

1597
01:13:22,610 --> 01:13:24,470
>> UDJENZA: Għaliex inti
jmorru minn fuq għal isfel.

1598
01:13:24,470 --> 01:13:25,600
>> Davin: Iva.

1599
01:13:25,600 --> 01:13:26,100
Perfect.

1600
01:13:26,100 --> 01:13:29,207
Allura huwa jgħid, inti tmur minn fuq għal
qiegħ, li huwa assolutament korretta.

1601
01:13:29,207 --> 01:13:30,790
Inti qed tmur biex jmorru minn fuq għal isfel.

1602
01:13:30,790 --> 01:13:34,790
U fl JavaScript, jQuery, inti għandek
funzjoni li l-onload simili, jew lesta,

1603
01:13:34,790 --> 01:13:38,030
u li tgħid, OK, stenna sakemm
kollha ta 'dan HTML tkun mgħobbija.

1604
01:13:38,030 --> 01:13:39,580
U mbagħad, sejħa tal-JavaScript.

1605
01:13:39,580 --> 01:13:42,190
Minħabba li aħna ma jkollhomx dak hawn, l-
ewwel ħaġa li għaddej biex jiġri

1606
01:13:42,190 --> 01:13:43,920
huwa li għaddej biex imorru minn fuq għal isfel.

1607
01:13:43,920 --> 01:13:46,310
Huwa ser hit li JS
sejħa, li għaddej biex twissi.

1608
01:13:46,310 --> 01:13:49,510
Wara li inti ikklikkja OK,
dak l-allert tmur bogħod.

1609
01:13:49,510 --> 01:13:53,600
Imbagħad huwa għaddej biex juru
inti l-HTML ġisem hawnhekk.

1610
01:13:53,600 --> 01:13:54,590
Nizza.

1611
01:13:54,590 --> 01:14:00,880
>> OK, hekk biss reali malajr, bil-miktub
fl JavaScript huwa super malajr.

1612
01:14:00,880 --> 01:14:02,710
Sabiex tiddikjara
varjabbli, isem var.

1613
01:14:02,710 --> 01:14:07,070
Allura fil-C, inti għandek i int, inti għandek
li tiddikjara liema tip ta 'tip li hu.

1614
01:14:07,070 --> 01:14:08,040
PHP, $.

1615
01:14:08,040 --> 01:14:08,755
JavaScript, var.

1616
01:14:08,755 --> 01:14:09,630
Aħna tkellimna dwar dan.

1617
01:14:09,630 --> 01:14:11,020
Kull dritt, ejja go.

1618
01:14:11,020 --> 01:14:12,510
>> Loops,-istess ħaġa.

1619
01:14:12,510 --> 01:14:14,230
L-istess ħaġa.

1620
01:14:14,230 --> 01:14:18,165
Dikjarazzjonijiet Funzjoni, so
bħad inti stajt tidher fl C.

1621
01:14:18,165 --> 01:14:21,290
L-unika ħaġa differenti hija tant meta
ikollok biex lingwi oħra ta 'programmazzjoni,

1622
01:14:21,290 --> 01:14:24,780
simili meta inti tieħu 51 semestru li jmiss
u int tagħmel ma OCAML,

1623
01:14:24,780 --> 01:14:26,690
inti tista 'tittratta mal-funzjonijiet anonimi.

1624
01:14:26,690 --> 01:14:28,240
Allura dan huwa eżattament dak li għandek hawn.

1625
01:14:28,240 --> 01:14:31,560
Allura inti tixtieq li tqiegħed fil-qosor,
xi tip ta 'valur somma.

1626
01:14:31,560 --> 01:14:33,870
Iżda int tista 'biss tkun tagħmel dan darba.

1627
01:14:33,870 --> 01:14:37,310
Allura inti ma tridx li hija sejħa funzjoni
somma, tagħtiha dikjarazzjoni funzjoni.

1628
01:14:37,310 --> 01:14:39,830
Minflok, inti biss użu minnha
bħala funzjoni anonima.

1629
01:14:39,830 --> 01:14:42,469
U inti stajt tidher dan il-lott.

1630
01:14:42,469 --> 01:14:44,510
Int ser ikollok tara eżempju ta '
dan fi pjastri koppja.

1631
01:14:44,510 --> 01:14:45,597
Yeah, aħna ser tara.

1632
01:14:45,597 --> 01:14:46,430
Gabe: Good kwistjoni.

1633
01:14:46,430 --> 01:14:50,660
Meta tista 'tixtieq li tuża
funzjoni anonimu hawn?

1634
01:14:50,660 --> 01:14:54,111
Bażikament, meta inti tixtieq xi ħaġa,
bħal avveniment, li jiġri.

1635
01:14:54,111 --> 01:14:55,860
Allura meta l-ġurdien huwa
għafast, per eżempju,

1636
01:14:55,860 --> 01:14:57,790
inti tixtieq xi funzjoni li tkun imsejħa.

1637
01:14:57,790 --> 01:15:00,570
Allura inti tgħaddi l-avveniment
handler, inti tgħaddi l-avveniment,

1638
01:15:00,570 --> 01:15:02,870
tip ta ', il-funzjoni li
inti tixtieq li tkun imsejħa.

1639
01:15:02,870 --> 01:15:04,710
U dak li qed tgħaddi
huwa simili, fl-aħħar

1640
01:15:04,710 --> 01:15:08,757
tal-ġurnata, biss pointer biex
dik l-istruzzjoni, għall-funzjoni.

1641
01:15:08,757 --> 01:15:11,090
Allura mhuwiex simili int tgħaddi
il-kodiċi kollu, eżatt kif

1642
01:15:11,090 --> 01:15:12,173
pointer għall-funzjoni.

1643
01:15:12,173 --> 01:15:17,871
U mbagħad, meta klikks xi ħadd l-
ġurdien, allura dik il-funzjoni gets imsejħa.

1644
01:15:17,871 --> 01:15:22,340
>> Davin: Arrays, sabiex inti
ikollhom dikjarazzjoni firxa.

1645
01:15:22,340 --> 01:15:23,990
Imbagħad, firxa biex l-affarijiet fil.

1646
01:15:23,990 --> 01:15:25,769
Real quick, x'se dan jistampa?

1647
01:15:25,769 --> 01:15:27,060
X'se it-tielet element tkun?

1648
01:15:27,060 --> 01:15:31,470

1649
01:15:31,470 --> 01:15:32,450
>> UDJENZA: "JS".

1650
01:15:32,450 --> 01:15:33,940
>> Davin: Dritt, dan ikun "JS."

1651
01:15:33,940 --> 01:15:35,760
Stenna, jmorru lura.

1652
01:15:35,760 --> 01:15:37,100
X'inhu t-tul?

1653
01:15:37,100 --> 01:15:38,117
>> UDJENZA: Tliet.

1654
01:15:38,117 --> 01:15:38,950
Davin: Tliet, id-dritt?

1655
01:15:38,950 --> 01:15:40,210
Eżattament dak li inti taħseb.

1656
01:15:40,210 --> 01:15:42,072
OK, issa jmorru.

1657
01:15:42,072 --> 01:15:43,530
Arrays, inti tista 'żżid l-affarijiet għalihom.

1658
01:15:43,530 --> 01:15:45,395
Allura inti tista 'tmur lil hinn mill-
limiti inizjali tagħhom.

1659
01:15:45,395 --> 01:15:46,740
Just xi ħaġa li wieħed iżomm f'moħħu.

1660
01:15:46,740 --> 01:15:49,760
PHP, JavaScript, dawn qed ftit
daqsxejn aktar klementi f'termini ta 'affarijiet

1661
01:15:49,760 --> 01:15:50,570
bħal dik.

1662
01:15:50,570 --> 01:15:54,260
Oġġetti, simili ħafna
structs fis-C, ħafna

1663
01:15:54,260 --> 01:15:56,590
bħal arrays assoċjattiva fis PHP.

1664
01:15:56,590 --> 01:15:58,720
You ħadthom kollha kellhom esperjenza ma 'dan.

1665
01:15:58,720 --> 01:16:01,880
Allura JSON, meta int tgħaddi JSON
quddiem u lura fil-p sett tmienja,

1666
01:16:01,880 --> 01:16:03,260
li l-oġġett tiegħek.

1667
01:16:03,260 --> 01:16:06,290
>> Allura yeah, eżempju, eżempju reali malajr.

1668
01:16:06,290 --> 01:16:07,880
Hawnhekk huwa oġġett.

1669
01:16:07,880 --> 01:16:12,700
Il-mod għalik referenza dan
oġġett, hekk biss reali malajr,

1670
01:16:12,700 --> 01:16:18,630
ejja ngħidu jien ridt li jsibu
out, OK, dak li huwa l-kors?

1671
01:16:18,630 --> 01:16:20,681
U għalhekk l-isem oġġett hawnhekk huwa CS50.

1672
01:16:20,681 --> 01:16:23,180
U mbagħad jekk kelli assoċjattiva
firxa, kif nagħmel dan?

1673
01:16:23,180 --> 01:16:24,580
I ser tkun qed tuża ċavetta, id-dritt?

1674
01:16:24,580 --> 01:16:26,030
So I jkollhom l-isem tal-firxa.

1675
01:16:26,030 --> 01:16:30,160
Għandi parentesi, kwotazzjonijiet, ewlenin,
kwotazzjonijiet end, parentesi aħħar,

1676
01:16:30,160 --> 01:16:33,610
u li se referenza li
element ġewwa firxa assoċjattiva tiegħi.

1677
01:16:33,610 --> 01:16:37,646
Kif nista referenzjata
kors ġewwa oġġett tiegħi?

1678
01:16:37,646 --> 01:16:39,170
Kulmin jafu?

1679
01:16:39,170 --> 01:16:40,622
>> UDJENZA: [inaudible].

1680
01:16:40,622 --> 01:16:41,784
>> Davin: X'hemm up?

1681
01:16:41,784 --> 01:16:42,700
UDJENZA: CS50.course.

1682
01:16:42,700 --> 01:16:43,510
Davin: Dritt, yeah.

1683
01:16:43,510 --> 01:16:45,320
Allura CS50.course.

1684
01:16:45,320 --> 01:16:48,770
Allura l-mod għalik referenza affarijiet
ġewwa oġġett JSON huwa bit-tikka.

1685
01:16:48,770 --> 01:16:53,114
>> UDJENZA: Tista 'wkoll tuża sintassi firxa.

1686
01:16:53,114 --> 01:16:54,050
>> Davin: OK, multa.

1687
01:16:54,050 --> 01:16:57,544
>> Gabe: Tista 'wkoll tuża bracket CS50,
spag, bħall-virgoletti.

1688
01:16:57,544 --> 01:16:59,210
UDJENZA: Naħseb li huwa identiku għal PHP.

1689
01:16:59,210 --> 01:17:00,293
Gabe: Huwa l-istess ħaġa.

1690
01:17:00,293 --> 01:17:02,487
Davin: Fine!

1691
01:17:02,487 --> 01:17:03,945
Imma inti se tara dan postijiet oħra.

1692
01:17:03,945 --> 01:17:08,990

1693
01:17:08,990 --> 01:17:10,480
Yeah, sabiex iżommu għaddejjin.

1694
01:17:10,480 --> 01:17:13,330
Dan huwa dak I biss qal.

1695
01:17:13,330 --> 01:17:17,840
Allura ġo eżempju JavaScript jQuery.

1696
01:17:17,840 --> 01:17:19,440
Allura dan huwa DOM tiegħi, id-dritt?

1697
01:17:19,440 --> 01:17:22,290

1698
01:17:22,290 --> 01:17:25,410
Real malajr, so I jkollhom
ras, bonjour dinja, korp.

1699
01:17:25,410 --> 01:17:26,160
I ikollhom buttuna.

1700
01:17:26,160 --> 01:17:27,870
Hija tgħid "push me," so I tixtieq li timbotta lilha.

1701
01:17:27,870 --> 01:17:29,745
U nixtieq li tagħmel xi ħaġa
meta huwa għafast.

1702
01:17:29,745 --> 01:17:31,220
Dritt, li jmiss.

1703
01:17:31,220 --> 01:17:34,630
>> Dritt, għalhekk dan huwa tiegħi JavaScript.

1704
01:17:34,630 --> 01:17:37,790
Allura jQuery huwa biss aktar faċli
mod li tikteb JavaScript.

1705
01:17:37,790 --> 01:17:40,920
Allura dan, u dak li jien ser jurik
inti jmiss, se tkun jQuery,

1706
01:17:40,920 --> 01:17:41,930
huma identiċi.

1707
01:17:41,930 --> 01:17:43,990
Allura dawn se jagħmlu l-istess affarijiet.

1708
01:17:43,990 --> 01:17:45,974
Just jQuery tendenza li jkun ftit aktar faċli.

1709
01:17:45,974 --> 01:17:47,140
Nies għandhom tendenza li bhalu aktar.

1710
01:17:47,140 --> 01:17:48,390
Hija għandha ħafna ta 'funzjonalità.

1711
01:17:48,390 --> 01:17:49,830
Sabiex in-nies għandhom tendenza li jużaw jQuery.

1712
01:17:49,830 --> 01:17:53,270
You kollha użati jQuery fl-aħħar p-sett.

1713
01:17:53,270 --> 01:17:54,270
Allura x'se dan tagħmel?

1714
01:17:54,270 --> 01:17:56,580
X'inhu dan se JavaScript-- hekk
dan huwa biss sempliċi JavaScript.

1715
01:17:56,580 --> 01:17:57,430
X'se dan do?

1716
01:17:57,430 --> 01:18:00,600

1717
01:18:00,600 --> 01:18:03,450
X'se tagħmel?

1718
01:18:03,450 --> 01:18:04,890
>> Allura l-ewwel, tara onload tieqa.

1719
01:18:04,890 --> 01:18:05,390
Dritt?

1720
01:18:05,390 --> 01:18:06,640
Allura aħna ma tara li qabel.

1721
01:18:06,640 --> 01:18:09,380
Allura dan se tistenna
sakemm il-tieqa tagħbijiet kollu.

1722
01:18:09,380 --> 01:18:12,770
Allura huwa għaddej biex tistenna sakemm
it-tagħbija HTML, l-immaġini

1723
01:18:12,770 --> 01:18:13,770
qabel tagħmel xi ħaġa.

1724
01:18:13,770 --> 01:18:16,050
Mela ejja ngħidu DOM tagħna mgħobbija.

1725
01:18:16,050 --> 01:18:17,270
Kollox hemm.

1726
01:18:17,270 --> 01:18:19,080
Imbagħad dak li għaddej biex jiġri?

1727
01:18:19,080 --> 01:18:19,922
Yeah?

1728
01:18:19,922 --> 01:18:22,880
>> UDJENZA: Button jidher.

1729
01:18:22,880 --> 01:18:25,201
>> Davin: Il-buttuna li diġà hemm.

1730
01:18:25,201 --> 01:18:26,700
Yeah, hekk il-buttuna li diġà hemm.

1731
01:18:26,700 --> 01:18:31,190
Iżda dan se ngħid,
OK, jekk I ikklikkja l-buttuna,

1732
01:18:31,190 --> 01:18:33,650
hekk il-buttuna li diġà
hemm, bħal dik tag HTML.

1733
01:18:33,650 --> 01:18:35,980
Stenna, jmorru lura malajr reali.

1734
01:18:35,980 --> 01:18:39,470
Dan tag dritt dritt hawnhekk hija
se tkun buttuna diġà.

1735
01:18:39,470 --> 01:18:40,810
Hemm diġà buttuna.

1736
01:18:40,810 --> 01:18:44,120
Iżda mbagħad, il-JavaScript
tag, dritt hawn,

1737
01:18:44,120 --> 01:18:46,160
jgħid, OK, I trid
biex tikseb l-element bl-identità,

1738
01:18:46,160 --> 01:18:50,300
hekk buttuna ta 'tfittxija eżatt jgħid, OK, I trid
Mappa dan il-varjabbli li dik buttuna.

1739
01:18:50,300 --> 01:18:53,120
Allura dak il-varjabbli huwa biss
mod aktar faċli għall-aċċess dik buttuna.

1740
01:18:53,120 --> 01:18:57,300
U jien ngħid, OK, jekk I ikklikkja li
buttuna, hekk jekk I ikklikkja dak l-element,

1741
01:18:57,300 --> 01:18:59,560
u dan l-element tirreferi għal
il-buttuna, jekk I ikklikkja,

1742
01:18:59,560 --> 01:19:00,875
imbagħad I tixtieq li sejħa funzjoni.

1743
01:19:00,875 --> 01:19:03,500
Hawnhekk huwa wieħed minn dawk anonimi
funzjonijiet konna jitkellem dwar.

1744
01:19:03,500 --> 01:19:04,840
>> Just sejħa xi funzjoni.

1745
01:19:04,840 --> 01:19:08,840
Ġewwa dik il-funzjoni, bażikament
xi ħaġa li aħna stajt tidher ħafna, twissija.

1746
01:19:08,840 --> 01:19:10,477
Tikklikkja l-buttuna ta 'tfittxija.

1747
01:19:10,477 --> 01:19:12,060
Huwa ser bażikament ikollhom buttuna.

1748
01:19:12,060 --> 01:19:13,040
You ikklikkja dan.

1749
01:19:13,040 --> 01:19:14,040
Ikollok dak allert.

1750
01:19:14,040 --> 01:19:14,850
X out.

1751
01:19:14,850 --> 01:19:15,754
Thats it.

1752
01:19:15,754 --> 01:19:16,254
Yeah?

1753
01:19:16,254 --> 01:19:21,980
>> UDJENZA: Mela jekk inti tpoġġi l-iskrittura
[Inaudible], tag iskrittura fil-HTML tiegħek?

1754
01:19:21,980 --> 01:19:24,300
>> Davin: Inti tista 'tpoġġi l-iskrittura
straight tag fir-ras

1755
01:19:24,300 --> 01:19:30,667
għaliex għandek dan onload.

1756
01:19:30,667 --> 01:19:32,000
Huwa wkoll li inti għandek ikklikkja.

1757
01:19:32,000 --> 01:19:34,166
Allura huwa għaddej biex tistenna sakemm
inti ikklikkja għal xi ħaġa.

1758
01:19:34,166 --> 01:19:37,470
Imma onload huwa biss sabiex ikunu sikuri, biex jagħmlu
żgur kollox tagħbijiet fis HTML tiegħek

1759
01:19:37,470 --> 01:19:38,170
qabel.

1760
01:19:38,170 --> 01:19:39,247
Yeah?

1761
01:19:39,247 --> 01:19:40,330
Inti tixtieq li ngħid xi ħaġa?

1762
01:19:40,330 --> 01:19:41,080
>> Gabe: [inaudible].

1763
01:19:41,080 --> 01:19:42,485
Davin: Yeah.

1764
01:19:42,485 --> 01:19:45,426
>> UDJENZA: Allura jevita onload
tiddefinixxi l-buttuna ta 'tfittxija varjabbli

1765
01:19:45,426 --> 01:19:49,930
billi biss qal document.getElementByID
tfittxija buttuna dot [inaudible].

1766
01:19:49,930 --> 01:19:52,320
>> Davin: Żgur, iżda mbagħad
string tiegħek biss gets enormi.

1767
01:19:52,320 --> 01:19:55,553
Eżattament, għalhekk dan huwa biss biex
jagħmluha eħfef għalik, yeah.

1768
01:19:55,553 --> 01:19:56,053
Iva?

1769
01:19:56,053 --> 01:19:57,886
>> UDJENZA: Fejn ma we
joħolqu window.onload?

1770
01:19:57,886 --> 01:19:58,951
Jew document.ready?

1771
01:19:58,951 --> 01:20:00,590
>> Davin:. Iva, hemm

1772
01:20:00,590 --> 01:20:02,094
Iva, hemm, I ċċekkjati.

1773
01:20:02,094 --> 01:20:03,710
>> Gabe: Mhux għalihom biex jimpurtahom.

1774
01:20:03,710 --> 01:20:06,970
>> Davin: OK, hekk jien ser
biex jgħidlek xorta waħda.

1775
01:20:06,970 --> 01:20:11,005
Allura bażikament, biss b'mod ġenerali, hekk
window.onload tistenna sakemm DOM tiegħek, kollha

1776
01:20:11,005 --> 01:20:12,180
HTML tiegħek, tagħbijiet.

1777
01:20:12,180 --> 01:20:13,513
Hija tistenna sakemm tagħbija immaġini tiegħek.

1778
01:20:13,513 --> 01:20:14,930
Hija tistenna sakemm tagħbijiet kollox.

1779
01:20:14,930 --> 01:20:18,410
document.ready, hija biss
tistenna sakemm tagħbijiet DOM tiegħek.

1780
01:20:18,410 --> 01:20:22,190
Ladarba l-HTML hija kollha hemmhekk, ladarba
DOM tiegħek huwa hemmhekk, jibda running.

1781
01:20:22,190 --> 01:20:23,400
Dik hija l-unika differenza.

1782
01:20:23,400 --> 01:20:24,700
>> Gabe: Quick sanità check hawn.

1783
01:20:24,700 --> 01:20:29,060
Allura dan jista 'jidher tip ta'
bħal linja ta 'kodiċi, id-dritt?

1784
01:20:29,060 --> 01:20:33,600
Għaliex dan huwa window.onload
huwa ugwali għal mazz ta 'għalf.

1785
01:20:33,600 --> 01:20:39,030
Meta JavaScript jaqra dan, vera jew
falza, il-funzjoni gets esegwiti.

1786
01:20:39,030 --> 01:20:40,020
Foloz.

1787
01:20:40,020 --> 01:20:40,920
OK?

1788
01:20:40,920 --> 01:20:44,470
X'jiġri hawn, int biss tgħaddi
dan jiffunzjona bħala funzjonijiet anonimi

1789
01:20:44,470 --> 01:20:45,300
biex window.onload.

1790
01:20:45,300 --> 01:20:48,480
U allura meta huwa se
li attwalment tikseb esegwiti?

1791
01:20:48,480 --> 01:20:49,600
Meta t-tagħbijiet tieqa.

1792
01:20:49,600 --> 01:20:50,420
C'est avveniment.

1793
01:20:50,420 --> 01:20:52,460
Allura dak jus t ħaġa nkunu
jitkellem dwar preċedenti, id-dritt?

1794
01:20:52,460 --> 01:20:54,580
Allura meta jiġri l-avveniment,
il-funzjoni jiġri.

1795
01:20:54,580 --> 01:20:55,746
Istess ħaġa ma 'l-onclick.

1796
01:20:55,746 --> 01:20:59,510

1797
01:20:59,510 --> 01:21:03,130
>> Davin: OK, so xi ħadd ħa
bogħod il-document.ready.

1798
01:21:03,130 --> 01:21:04,698
Iżda dan se jkun l-same-- eżatti

1799
01:21:04,698 --> 01:21:06,864
UDJENZA: Is-sinjal dollaru,
li huwa document.ready.

1800
01:21:06,864 --> 01:21:07,710
C'est shortcut.

1801
01:21:07,710 --> 01:21:08,501
>> Davin: Oh, li hu?

1802
01:21:08,501 --> 01:21:10,880

1803
01:21:10,880 --> 01:21:15,500
OK, għalhekk dan ifisser
document.ready, shortcut.

1804
01:21:15,500 --> 01:21:19,660
Iżda dan huwa l-istess bħal window.onload
ħlief għal dik id-differenza ftit

1805
01:21:19,660 --> 01:21:20,680
I qallek dwar.

1806
01:21:20,680 --> 01:21:21,870
U dan huwa jQuery.

1807
01:21:21,870 --> 01:21:25,190
Allura dan huwa l-istess eżatt
thing-- dan huwa JavaScript.

1808
01:21:25,190 --> 01:21:29,500
Dan huwa just-- xi nies jaħsbu li
bħala piż aktar dawl, verżjoni sleek

1809
01:21:29,500 --> 01:21:32,370
li għandha lottijiet ta 'funzjonalità
li inti probabilment tkun tuża.

1810
01:21:32,370 --> 01:21:34,500
Allura dan ma l-istess ħaġa eżatt.

1811
01:21:34,500 --> 01:21:37,110
>> Allura affarijiet li tip ta 'punt out.

1812
01:21:37,110 --> 01:21:40,364
Għalhekk fl-eżempju oħra, aħna
kellhom document.getElementByID,

1813
01:21:40,364 --> 01:21:42,280
hekk kellna dan twil
string li għaddej biex tikseb

1814
01:21:42,280 --> 01:21:44,290
l-element bi kwalunkwe ID hija għandha.

1815
01:21:44,290 --> 01:21:46,470
Li sostitwit b'dan ir-sejħa dritt hawn.

1816
01:21:46,470 --> 01:21:50,860
Allura inti tara s-sinjal dollaru,
allura inti tara kwotazzjoni, hashtag.

1817
01:21:50,860 --> 01:21:52,370
Hashtag huwa dejjem selettur.

1818
01:21:52,370 --> 01:21:54,730
Hija tgħid, OK, dan għandu ma 'l-ID.

1819
01:21:54,730 --> 01:21:56,120
X'hemm-selettur għal klassi?

1820
01:21:56,120 --> 01:21:57,190
>> UDJENZA: Dot.

1821
01:21:57,190 --> 01:21:57,960
>> Davin: Dot, id-dritt.

1822
01:21:57,960 --> 01:22:01,950
Jekk int biss tmur biex
tagħżel tikketta, dak li huwa dan?

1823
01:22:01,950 --> 01:22:03,310
Huwa biss il-lametta, eżattament.

1824
01:22:03,310 --> 01:22:05,560
U inti tista 'tuża dan hawnhekk, ukoll.

1825
01:22:05,560 --> 01:22:08,560
>> Gabe: U minn tikketta, rridu nfissru bħal
div, per eżempju, jew il-kap.

1826
01:22:08,560 --> 01:22:11,500
>> Davin: Or korp jew p jew
xi ħaġa bħal dik, yeah.

1827
01:22:11,500 --> 01:22:14,390
Allura hawnhekk, OK, minflok ta 'tgħid
document.getElementByID,

1828
01:22:14,390 --> 01:22:16,500
dan huwa biss l-istess ħaġa eżatt.

1829
01:22:16,500 --> 01:22:17,990
Biss fil jQuery, huwa iqsar.

1830
01:22:17,990 --> 01:22:19,860
Allura huwa sempliċi.

1831
01:22:19,860 --> 01:22:23,420
Mela allura, mhux aktar onclick, ikklikkja.

1832
01:22:23,420 --> 01:22:26,320
funzjoni jQuery, sejħa din il-funzjoni.

1833
01:22:26,320 --> 01:22:27,580
Twissija huwa l-istess eżatt.

1834
01:22:27,580 --> 01:22:29,452
Allura huwa ftit
iżgħar, jew ftit

1835
01:22:29,452 --> 01:22:32,410
iqsar, nies bit-- ftit jaħsbu
huwa ftit aktar faċli biex jiktbu out,

1836
01:22:32,410 --> 01:22:34,600
ftit aktar faċli biex jinftiehem.

1837
01:22:34,600 --> 01:22:35,640
Iżda din hija jQuery.

1838
01:22:35,640 --> 01:22:37,887
A lott ta 'nies jiksbu ftit
daqsxejn konfuż u inkwetat

1839
01:22:37,887 --> 01:22:40,220
u jaħsbu, OK, jQuery
hija differenti minn JavaScript.

1840
01:22:40,220 --> 01:22:42,136
I għandek tiftakar dawn
żewġ affarijiet differenti.

1841
01:22:42,136 --> 01:22:42,740
Mhuwiex.

1842
01:22:42,740 --> 01:22:45,315
I mean, huwa sintassi differenti.

1843
01:22:45,315 --> 01:22:46,970
Iżda jQuery hija JavaScript.

1844
01:22:46,970 --> 01:22:50,050
Huwa biss apparentement
Verżjoni aħjar li l-

1845
01:22:50,050 --> 01:22:51,967
jista 'jkun aktar faċli li
jifhmu li n-nies jużaw.

1846
01:22:51,967 --> 01:22:53,716
Gabe: Yeah, li jkun
onesti, dan is-sinjal dollaru

1847
01:22:53,716 --> 01:22:57,240
li tara fil jQuery, li jinsab biss l-
isem ta 'funzjoni li jQuery jiddefinixxi.

1848
01:22:57,240 --> 01:22:58,614
Huwa ma jkollu xejn speċjali.

1849
01:22:58,614 --> 01:23:03,140
Huwa Huwa biss l-isem ta 'funzjoni,
bħad inti tista 'tiddefinixxi sinjal dollaru.

1850
01:23:03,140 --> 01:23:05,670
>> Davin: Yeah, hekk tkellem dwar dan.

1851
01:23:05,670 --> 01:23:06,680
Xi affarijiet utli.

1852
01:23:06,680 --> 01:23:10,414
I kienet tħares lura lejn il-kwiżż qodma.

1853
01:23:10,414 --> 01:23:13,080
Fl-aħħar ftit kwizzijiet, li ħadthom
kellhom jużaw affarijiet bħal dan.

1854
01:23:13,080 --> 01:23:15,230
Allura document.ready, so
kun żgur li kollox ta

1855
01:23:15,230 --> 01:23:17,410
mgħobbija qabel tibda tagħmel affarijiet.

1856
01:23:17,410 --> 01:23:20,120
Agħżel ID, jew tagħżel
klassi, huwa d biss

1857
01:23:20,120 --> 01:23:24,020
jkun quote dot xi klassi, kwotazzjoni aħħar.

1858
01:23:24,020 --> 01:23:26,580
Issottometti, hekk jekk int
sottomissjoni ta 'formola u sejħa

1859
01:23:26,580 --> 01:23:28,830
din il-funzjoni wara l-formola jissottometti.

1860
01:23:28,830 --> 01:23:34,210
Valur, so ejja ngħidu kelli formola
sottomissjoni, bħal isem l-utent, email,

1861
01:23:34,210 --> 01:23:34,950
ikun x'ikun.

1862
01:23:34,950 --> 01:23:36,010
I kellhom kaxxa ta 'test.

1863
01:23:36,010 --> 01:23:37,670
Allura jien ittajpjar f'dak kaxxa ta 'test.

1864
01:23:37,670 --> 01:23:42,170
Ukoll, jekk inti tixtieq li tikseb l-valur
barra minn dak kaxxa ta 'test, tuża dot val.

1865
01:23:42,170 --> 01:23:44,050
U mbagħad, stabbiliti hawn,
dot HTML huwa l-istess

1866
01:23:44,050 --> 01:23:47,710
huwa simili dokument dot
getElementByID dot innerHTML.

1867
01:23:47,710 --> 01:23:50,890
Allura li għaddej biex jirritorna
inti l-HTML minn dik ID.

1868
01:23:50,890 --> 01:23:55,080
Hawnhekk, inti biss tuża xi
ID jew kwalunkwe dot HTML.

1869
01:23:55,080 --> 01:23:56,930
Li ser jiksbu l-HTML minn dak l-element.

1870
01:23:56,930 --> 01:24:00,130
Jekk int riedu li mbagħad bidla li
HTML, inti tista 'tgħaddiha xi ħaġa.

1871
01:24:00,130 --> 01:24:05,600
Allura youd tkun simili dot HTML, u mbagħad
ġewwa, kwotazzjonijiet, HTML ġdid jew xi ħaġa.

1872
01:24:05,600 --> 01:24:07,490
>> Gabe: OK, so Ajax.

1873
01:24:07,490 --> 01:24:10,347
I really simili li jifhmu
Ajax verament tajjeb.

1874
01:24:10,347 --> 01:24:12,430
So I tixtieq inti guys għall
jifhmu Ajax verament tajjeb.

1875
01:24:12,430 --> 01:24:14,221
Għaliex jekk inti tagħmel,
int pretty ħafna li jmorru

1876
01:24:14,221 --> 01:24:16,810
biex jifhmu dak kollu li
għandha tagħmel ma HTTP, PHP,

1877
01:24:16,810 --> 01:24:21,080
JavaScript għaliex kulħadd
jiltaqa 'flimkien fi Ajax.

1878
01:24:21,080 --> 01:24:25,130
Ajax ma tkunx lingwa.

1879
01:24:25,130 --> 01:24:27,000
Ajax hija teknika.

1880
01:24:27,000 --> 01:24:31,690
U hija tuża lottijiet ta 'għodod differenti.

1881
01:24:31,690 --> 01:24:35,090
Ajax stands għall
XML JavaScript mhux sinkroniku.

1882
01:24:35,090 --> 01:24:36,730
Allura l-metodu, il-lingwa, id-data.

1883
01:24:36,730 --> 01:24:40,610
>> Allura l-lingwa ewlenija li nużaw
fil Ajax biex jiġu xprunati kollox

1884
01:24:40,610 --> 01:24:42,830
u biex jimmaniġġaw kollox
aktar tard huwa JavaScript.

1885
01:24:42,830 --> 01:24:45,160
C'est pourquoi tirrelata
qrib ħafna JavaScript.

1886
01:24:45,160 --> 01:24:49,810
U allura mhux sinkroniku huwa
għaliex aħna ma tagħmel dan

1887
01:24:49,810 --> 01:24:51,980
kollha f'daqqa meta aħna qed jitgħabba il-paġna.

1888
01:24:51,980 --> 01:24:57,190
Dan huwa l-ħaġa li nistgħu
tagħmel affarijiet tip ta 'b'mod parallel.

1889
01:24:57,190 --> 01:24:59,725
L-idea prinċipali wara
Ajax huwa li inti tixtieq

1890
01:24:59,725 --> 01:25:02,170
li nikseb xi informazzjoni speċifika.

1891
01:25:02,170 --> 01:25:06,450
Per eżempju, meta int ittajpjar ġdid
isem l-utent meta inti tirreġistra isem l-utent,

1892
01:25:06,450 --> 01:25:08,520
isem l-utent tiegħi huwa abc123.

1893
01:25:08,520 --> 01:25:11,671
U mbagħad, fl-aħħar ta 'l-
forma, inti għandek ikklikkja Submit.

1894
01:25:11,671 --> 01:25:14,420
U kellha tmur għall-server,
u mbagħad tiċċekkja jekk fid-database,

1895
01:25:14,420 --> 01:25:15,594
abc123 hija diġà hemm.

1896
01:25:15,594 --> 01:25:18,510
U jekk huwa diġà hemmhekk, jgħid,
isem l-utent diġà fid-database.

1897
01:25:18,510 --> 01:25:21,010
U huma, inti għandek timla
l-formola kollu mill-ġdid.

1898
01:25:21,010 --> 01:25:23,110
U kien tassew, tassew ħżiena.

1899
01:25:23,110 --> 01:25:25,440
>> U allura n-nies jgħidu,
OK, għaliex ma nistgħu biss

1900
01:25:25,440 --> 01:25:29,560
do talba HTTP żgħir biex jiċċekkjaw biss
biex tara jekk dan l-utent huwa fid-database

1901
01:25:29,560 --> 01:25:32,080
qabel ma l-utent kellhom
jibagħtu l-formola sħiħa?

1902
01:25:32,080 --> 01:25:36,350
Hekk per eżempju, meta l-
utent finituri ittajpjar abc123,

1903
01:25:36,350 --> 01:25:39,660
ejja biss jmorru għall-server ftit
bit u biss jiksbu vera jew falza

1904
01:25:39,660 --> 01:25:43,080
mis-server biex tara jekk
li l-isem l-utent validu jew le.

1905
01:25:43,080 --> 01:25:49,250
OK, hekk li wieħed mill-ewlenin
użi ta 'Ajax illum għadu.

1906
01:25:49,250 --> 01:25:52,130
>> Davin: Allura reali quick, fl
sejħa Ajax fl jQuery,

1907
01:25:52,130 --> 01:25:54,770
inti tista 'tfisser li inti
jixtiequ li din tkun sinkroniku.

1908
01:25:54,770 --> 01:25:56,330
Inti m'għandekx tagħmel dan.

1909
01:25:56,330 --> 01:25:57,640
Iżda int tista 'tagħmel dan.

1910
01:25:57,640 --> 01:25:59,277
U jekk inti ma li, dak li jiġri?

1911
01:25:59,277 --> 01:26:01,610
Ukoll, per eżempju, meta int
jkollna aħbarijiet jew kwalunkwe,

1912
01:26:01,610 --> 01:26:05,464
browser tiegħek huwa biss se tistenna
sakemm dik is-sejħa kollu huwa komplut

1913
01:26:05,464 --> 01:26:08,130
minflok ta 'kiri inti tagħmel ieħor
affarijiet dritt wara inti ikklikkja dan.

1914
01:26:08,130 --> 01:26:14,560

1915
01:26:14,560 --> 01:26:17,115
>> Gabe: Mhuwiex tgħaddi aktar.

1916
01:26:17,115 --> 01:26:19,681
Oh my god.

1917
01:26:19,681 --> 01:26:20,180
Jiddispjacini!

1918
01:26:20,180 --> 01:26:22,810

1919
01:26:22,810 --> 01:26:23,601
Yup.

1920
01:26:23,601 --> 01:26:25,350
"Fil-passat, il-
klijent meħtieġa biex talba

1921
01:26:25,350 --> 01:26:26,840
il-kontenut kollu ta 'websajt. "

1922
01:26:26,840 --> 01:26:28,210
Dan huwa dak li għidt.

1923
01:26:28,210 --> 01:26:30,070
Dan jippermetti li tibgħat
IKOLLOK addizzjonali jew POST

1924
01:26:30,070 --> 01:26:32,140
talbiet mingħajr ma jkollhom
biex jerġgħu jitgħabbew browser tagħna.

1925
01:26:32,140 --> 01:26:34,806
Għalhekk fl-aħħar tal-ġurnata, aħna qed
attwalment Nagħmlu talbiet HTTP

1926
01:26:34,806 --> 01:26:35,740
hawn tuża JavaScript.

1927
01:26:35,740 --> 01:26:39,700
Minħabba li qabel, aħna biss użati JavaScript
li jibdlu l-HTML li diġà daħal.

1928
01:26:39,700 --> 01:26:43,110
U issa, nistgħu nużaw għall-interface
mal-web servers kif ukoll.

1929
01:26:43,110 --> 01:26:46,140
Il-mod dan jiġri
hija li għandna l-klijent.

1930
01:26:46,140 --> 01:26:47,340
Davin huwa klijent.

1931
01:26:47,340 --> 01:26:50,797
U hu għandu l-JavaScript kollha
running għaliex HTML huwa dumb.

1932
01:26:50,797 --> 01:26:51,630
JavaScript huwa intelliġenti.

1933
01:26:51,630 --> 01:26:54,690
Allura Davin Davin għandu smart tiegħu
parti u parti mutu tiegħu.

1934
01:26:54,690 --> 01:26:57,590
Hu għaddej biex tuża parti intelliġenti tiegħu issa.

1935
01:26:57,590 --> 01:27:00,860
Hu għaddej biex jużaw JavaScript
għat-talba, per eżempju,

1936
01:27:00,860 --> 01:27:04,340
kemm jekk abc123 huwa
-database jew le.

1937
01:27:04,340 --> 01:27:08,450
>> Allura Davin, jekk jogħġbok, inti biss
tibgħatli talba HTTP.

1938
01:27:08,450 --> 01:27:09,197
Grazzi.

1939
01:27:09,197 --> 01:27:10,530
Hekk hu biss mibgħuta talba HTTP.

1940
01:27:10,530 --> 01:27:11,270
You tara li?

1941
01:27:11,270 --> 01:27:14,700
U dan huwa biss l-istess mod
li kull talba HTTP tintbagħat.

1942
01:27:14,700 --> 01:27:16,830
Il-browser, Google
Chrome jew xi ħaġa, huwa

1943
01:27:16,830 --> 01:27:19,570
ser tara li dak il-Davin
jippruvaw jibagħtu talba HTTP,

1944
01:27:19,570 --> 01:27:20,930
ser jgħinu HM ftit.

1945
01:27:20,930 --> 01:27:23,950
U li għaddej biex imorru
it-triq kollha lejn il-server.

1946
01:27:23,950 --> 01:27:27,370
Issa, il-server huwa se jkollu
PHP hawn, jew kwalunkwe lingwa oħra.

1947
01:27:27,370 --> 01:27:29,990
Eżatt bħal f'talba normali HTTP.

1948
01:27:29,990 --> 01:27:31,950
Huwa pretty ħafna għal talba normali HTTP.

1949
01:27:31,950 --> 01:27:33,658
>> U mbagħad, il-server
se ngħid, OK,

1950
01:27:33,658 --> 01:27:37,270
Davin trid lili biex jiċċekkjaw jekk
dan abc123 huwa fid-database.

1951
01:27:37,270 --> 01:27:38,310
Mur kellem lill-mudell.

1952
01:27:38,310 --> 01:27:41,310
Il-mudell jgħid mhuwiex.
abc123 huwa isem l-utent tajba.

1953
01:27:41,310 --> 01:27:47,940
U mbagħad, il-web server se
jużaw PHP li tirrendi xi forma ta 'fajl.

1954
01:27:47,940 --> 01:27:52,280
Dan jista 'jkun litteralment biss fajl
li fiha "iva" fiha, jew "l-ebda,

1955
01:27:52,280 --> 01:27:53,315
jew xi ħaġa bħal dik.

1956
01:27:53,315 --> 01:27:54,190
Dan jista 'jkun kwalunkwe fajl.

1957
01:27:54,190 --> 01:27:57,080
>> Dan jista 'jkun simili jien ser
tibgħat Davin stampa ta 'papri

1958
01:27:57,080 --> 01:28:01,200
jekk huwa fid-database u
tibgħat stampa ta 'ħamster

1959
01:28:01,200 --> 01:28:02,420
jekk mhuwiex fid-database.

1960
01:28:02,420 --> 01:28:04,294
Dan ikun it-tip ta '
mutu, iżda se taħdem.

1961
01:28:04,294 --> 01:28:07,030
OK, so I tibgħat papra għall Davin.

1962
01:28:07,030 --> 01:28:08,150
Davin ltqajna papra.

1963
01:28:08,150 --> 01:28:13,330
U issa, li tkun se
biex jimmaniġġaw il-papra?

1964
01:28:13,330 --> 01:28:16,390
Parti Davin ta smart darb'oħra,
hekk JavaScript, id-dritt?

1965
01:28:16,390 --> 01:28:18,620
JavaScript bagħtet lill-
talba, u JavaScript

1966
01:28:18,620 --> 01:28:22,300
se tirċievi t-talba
u interpretata f'xi forma.

1967
01:28:22,300 --> 01:28:26,630
>> U f'dan is-sens, li għaddej biex
jgħidu, OK, jekk papri allura jien tajba.

1968
01:28:26,630 --> 01:28:30,770
Jekk ħamster, allura jien ser
li jgħidu, no, isem l-utent diġà

1969
01:28:30,770 --> 01:28:31,970
teżisti fid-database.

1970
01:28:31,970 --> 01:28:33,845
Iżda ġeneralment, int mhux
ser tibgħat papra.

1971
01:28:33,845 --> 01:28:36,740
Inti qed tmur biex tibgħat
xi ħaġa kemmxejn aktar intelliġenti.

1972
01:28:36,740 --> 01:28:40,320
U dak li nużaw huwa XML.

1973
01:28:40,320 --> 01:28:42,690
U aktar reċentement, nużaw JSON.

1974
01:28:42,690 --> 01:28:45,629
JSON huwa biss JavaScript
Notazzjoni Għan, li

1975
01:28:45,629 --> 01:28:47,670
hija bażikament ikollok
oġġett JavaScript kollu.

1976
01:28:47,670 --> 01:28:50,820
U inti poġġih fil-fajl, bħad
dak l-oġġett CS50 li inti guys raw.

1977
01:28:50,820 --> 01:28:53,090
Inti poġġih fil-fajl, u
inti tibgħat dan matul Davin.

1978
01:28:53,090 --> 01:28:55,850
>> Allura f'dan il-każ, nixtieq
tagħmel oġġett JavaScript

1979
01:28:55,850 --> 01:28:59,570
u biss jgħidu, teżisti utent, iva.

1980
01:28:59,570 --> 01:29:01,630
Jew l-utent ma jeżisti, l-ebda.

1981
01:29:01,630 --> 01:29:02,810
U jibgħatha lura lilu.

1982
01:29:02,810 --> 01:29:03,830
U għaliex JSON?

1983
01:29:03,830 --> 01:29:07,330
Minħabba li l-persuna
li s tirċievi din hija

1984
01:29:07,330 --> 01:29:10,030
ser tuża JavaScript
biex jimmaniġġaw ir-rispons.

1985
01:29:10,030 --> 01:29:14,970
U JavaScript xogħlijiet hekk ukoll minħabba
huwa msejjaħ JavaScript Notazzjoni Għan.

1986
01:29:14,970 --> 01:29:15,470
Dritt?

1987
01:29:15,470 --> 01:29:19,660
Sabiex ikun jista 'biss sejħa funzjoni u jiksbu
dan l-oġġett sbieħ mir-rispons.

1988
01:29:19,660 --> 01:29:22,890
U mbagħad, huwa għaddej biex tkun taf jekk
dak l-utent huwa fil-database jew le.

1989
01:29:22,890 --> 01:29:25,230
>> Allura inti tara, kollha ta 'dan ġejjin
flimkien fil-web server,

1990
01:29:25,230 --> 01:29:28,450
u allura hemm HTTP wieħed għat-talba
u r-rispons HTTP wieħed u kollox.

1991
01:29:28,450 --> 01:29:30,600
Sabiex tagħmel żgur li int guys
jifhmu din is-sejħa Ajax

1992
01:29:30,600 --> 01:29:37,260
għaliex jgħinek tifhem kollox
mill-kunċetti aħna qed jitkellem dwar.

1993
01:29:37,260 --> 01:29:40,260
>> Allura hawnhekk eżempju
ta Ajax ma jQuery.

1994
01:29:40,260 --> 01:29:42,130
U hawn, nagħmlu ma get JSON.

1995
01:29:42,130 --> 01:29:45,660
Allura aħna mhux qed tipprova tikseb
immaġni ta 'qattus hawn, jew papra.

1996
01:29:45,660 --> 01:29:48,110
Aħna qed tipprova tikseb fajl JSON.

1997
01:29:48,110 --> 01:29:51,184
U allura aħna stenna sakemm
dan isir, dot jsir.

1998
01:29:51,184 --> 01:29:52,850
Dan ifisser jien stennija għar-rispons.

1999
01:29:52,850 --> 01:29:54,180
Huwa jista 'jieħu ftit ftit.

2000
01:29:54,180 --> 01:29:56,360
Imbagħad, inti tara ftit tagħbija.

2001
01:29:56,360 --> 01:29:59,340
Jekk inti tixtieq li tagħmel dan fil-website tiegħek.

2002
01:29:59,340 --> 01:30:01,440
Allura dot jsir, u allura dak
jiġri meta dan isir?

2003
01:30:01,440 --> 01:30:04,040
Inti tgħaddi fi anonima
funzjoni, bħad rajna qabel.

2004
01:30:04,040 --> 01:30:07,800
Minħabba jsir huwa avveniment, just
bħal tikklikkja ġurdien jew kwalunkwe,

2005
01:30:07,800 --> 01:30:08,710
għall jQuery.

2006
01:30:08,710 --> 01:30:13,710
Allura inti tgħaddi fil din il-funzjoni ma
data, it-test, l-istatus, u jqXHR.

2007
01:30:13,710 --> 01:30:15,790
U bażikament, li
biss xi varjabbli

2008
01:30:15,790 --> 01:30:22,160
li tista 'tuża aktar tard fuq li jkollhom
l-istatus tat-talba HTTP,

2009
01:30:22,160 --> 01:30:24,470
id-data li huwa għaddej
li tibgħat lura lilek.

2010
01:30:24,470 --> 01:30:28,740
Mela allura inti tista 'aktar tard tinterpreta dan
u tagħmel xi ħaġa sinifikanti magħha.

2011
01:30:28,740 --> 01:30:30,240
U jekk tonqos, meta jista 'dan jonqsu?

2012
01:30:30,240 --> 01:30:33,780
Ukoll, meta t-talba HTTP tagħti
inti 500 jew xi ħaġa bħal dik.

2013
01:30:33,780 --> 01:30:37,420
Imbagħad, li għaddej biex jgħidlek il-
status, liema tip ta 'falliment li kien,

2014
01:30:37,420 --> 01:30:38,420
u kull xorta ta 'affarijiet.

2015
01:30:38,420 --> 01:30:40,630
Inti għandek tagħmel ċert
biex jimmaniġġaw żewġ każijiet,

2016
01:30:40,630 --> 01:30:42,770
inkella l-programm imur crazy.

2017
01:30:42,770 --> 01:30:45,820
>> Davin: Allura yeah, dan huwa eżattament
dak li inti raw fuq tiegħek aħħar p-sett.

2018
01:30:45,820 --> 01:30:49,720
Is-sejħa Ajax attwali hija fil-JSON get.

2019
01:30:49,720 --> 01:30:50,587
Dan huwa l-sejħa.

2020
01:30:50,587 --> 01:30:52,920
U mbagħad, dot isir huwa simili
din il-kontrolli jekk huwa ta 'suċċess.

2021
01:30:52,920 --> 01:30:55,620
Jekk huwa ta 'suċċess, inti tixtieq
biex tagħmel xi ħaġa ma 'l-informazzjoni.

2022
01:30:55,620 --> 01:30:59,290
Ikollok lura minn dik
Data talba JSON.

2023
01:30:59,290 --> 01:31:00,600
Dan huwa dak ikollok lura.

2024
01:31:00,600 --> 01:31:04,470
Mela jekk inti tiftakar minn tiegħek p-set,
lott ta 'inti kienu simili bracket data i

2025
01:31:04,470 --> 01:31:06,302
jew kwalunkwe, dot link jew it-titolu.

2026
01:31:06,302 --> 01:31:08,260
Tkun xi tkun s ġejjin lura
minn dik JSON, ikun x'ikun

2027
01:31:08,260 --> 01:31:11,020
l-oqsma huma f'dak l-oġġett JSON,
dan huwa dak li inti qed jkollna lura.

2028
01:31:11,020 --> 01:31:12,394
Data huwa dak li inti qed jkollna lura.

2029
01:31:12,394 --> 01:31:15,510
Istatus ta 'test, biss xi ħaġa li
ihallik taf dak li ġara.

2030
01:31:15,510 --> 01:31:20,570
U mbagħad, il-jqXHR, li jinsab biss
it-talba HTTP XML jQuery.

2031
01:31:20,570 --> 01:31:21,990
C'est bħad oġġett.

2032
01:31:21,990 --> 01:31:23,932
U mbagħad jonqsu, bħad Gabe qal.

2033
01:31:23,932 --> 01:31:27,140
Gabe: Fl-eżempju tagħna ftit tal abc123
biss biex jiċċekkjaw jekk dan huwa fid-database

2034
01:31:27,140 --> 01:31:32,260
jew le, id-data tkun xi ħaġa li għandek
ser jagħmlu, jekk teżisti data dot isem l-utent,

2035
01:31:32,260 --> 01:31:37,720
li huwa dak PHP tiegħek ġġenerati għall
inti, jekk teżisti isem data dot utent, allura

2036
01:31:37,720 --> 01:31:40,880
Jien ser iwissu, utent
isem diġà jeżisti.

2037
01:31:40,880 --> 01:31:44,300
Else, jien biss ser let il-
utent jipproċedi timla l-formola.

2038
01:31:44,300 --> 01:31:47,860

2039
01:31:47,860 --> 01:31:50,820
OK, is-sigurtà, berred.

2040
01:31:50,820 --> 01:31:52,060
>> Davin: Trid lili biex?

2041
01:31:52,060 --> 01:31:54,500
>> Gabe: I bħal dan wieħed.

2042
01:31:54,500 --> 01:31:57,680
Allura xi ħaġa li jistenna familjari.

2043
01:31:57,680 --> 01:31:59,750
Aħna qed kważi jsir.

2044
01:31:59,750 --> 01:32:02,670
Allura dan huwa biss l-eżempju
inti guys raw fil-klassi.

2045
01:32:02,670 --> 01:32:04,860
You kienu qed jużaw argv1 hawn.

2046
01:32:04,860 --> 01:32:06,460
C'est simili argument kmand tal-linja.

2047
01:32:06,460 --> 01:32:09,270
U aħna qed MEM ikkupjar li
fi buffer mid-daqs 12.

2048
01:32:09,270 --> 01:32:12,560
X'hemm l-problema hawn?

2049
01:32:12,560 --> 01:32:13,660
Overflow buffer!

2050
01:32:13,660 --> 01:32:15,400
Għaliex għandna buffer mid-daqs 12.

2051
01:32:15,400 --> 01:32:18,400
argv1 jista 'jkollhom daqs ta' żewġ biljun.

2052
01:32:18,400 --> 01:32:19,960
Aħna ma tagħmel xi verifika konfini.

2053
01:32:19,960 --> 01:32:24,970
Allura nistgħu kopja ta 'lott ta' memorja.

2054
01:32:24,970 --> 01:32:28,630
U aħna ser tkun partikolarment
ħżiena dwar dan.

2055
01:32:28,630 --> 01:32:32,600
Liema jista 'nagħmlu dan huwa
ħafna, jfissru ħafna f'dan il-każ?

2056
01:32:32,600 --> 01:32:33,278
Iva?

2057
01:32:33,278 --> 01:32:36,528
UDJENZA: Parti mill-żewġ biljuni ta affarijiet
fih kodiċi eżekutibbli li jirritorna

2058
01:32:36,528 --> 01:32:38,127
[Inaudible].

2059
01:32:38,127 --> 01:32:38,710
Gabe: Eżattament.

2060
01:32:38,710 --> 01:32:41,110
Allura dak it-tip ta '
ħaġa li n-nies jużaw

2061
01:32:41,110 --> 01:32:43,344
jailbreak iPhone, per eżempju.

2062
01:32:43,344 --> 01:32:44,260
Allura li tip ta 'ħaġa.

2063
01:32:44,260 --> 01:32:48,610
Għaliex inti tista 'biss tagħmel l-apparat
jesegwixxu kwalunkwe kodiċi li tixtieq.

2064
01:32:48,610 --> 01:32:50,247
L-jiffissaw, hekk l-jiffissaw huwa faċli.

2065
01:32:50,247 --> 01:32:51,330
Just jiċċekkjaw għall-limiti.

2066
01:32:51,330 --> 01:32:53,455
Inti tiċċekkja għal null minħabba
aħna dejjem kontroll għal null

2067
01:32:53,455 --> 01:32:54,940
meta aħna qed jittrattaw ma 'kordi.

2068
01:32:54,940 --> 01:32:57,840
U mbagħad, inti tieħu l-
tul string qabel.

2069
01:32:57,840 --> 01:33:00,150
U jekk il-string
tul huwa string validu

2070
01:33:00,150 --> 01:33:03,700
tul, li huwa fi ħdan 0
u 12, allura aħna qed tajba.

2071
01:33:03,700 --> 01:33:07,144
>> Davin: Jekk inti ma jiċċekkja għal
null, quick reali, x'se jiġri?

2072
01:33:07,144 --> 01:33:07,810
Hija ser SEG tort.

2073
01:33:07,810 --> 01:33:10,850
Għaliex se SEG tort?

2074
01:33:10,850 --> 01:33:12,510
Għax int ssejjaħ strlen fuq null.

2075
01:33:12,510 --> 01:33:13,010
Gabe: Yeah.

2076
01:33:13,010 --> 01:33:16,490

2077
01:33:16,490 --> 01:33:19,630
Veru jew falz, billi jintuża wieħed
password hija idea tajba.

2078
01:33:19,630 --> 01:33:20,430
>> UDJENZA: Falz.

2079
01:33:20,430 --> 01:33:21,150
>> Gabe: Falz.

2080
01:33:21,150 --> 01:33:23,870
Użu ħafna passwords, u kbar, dawk fit-tul.

2081
01:33:23,870 --> 01:33:26,050
Ikoni katnazz jiżguraw is-sigurtà.

2082
01:33:26,050 --> 01:33:27,080
>> UDJENZA: Falz.

2083
01:33:27,080 --> 01:33:27,749
>> Gabe: Falz.

2084
01:33:27,749 --> 01:33:28,790
Dan ma jfissirx xejn.

2085
01:33:28,790 --> 01:33:30,480
Huwa biss ta 'ikona.

2086
01:33:30,480 --> 01:33:32,824
SSL tipproteġi kontra
bniedem fl-attakk nofs.

2087
01:33:32,824 --> 01:33:33,490
UDJENZA: Falz.

2088
01:33:33,490 --> 01:33:34,110
Gabe: Falz.

2089
01:33:34,110 --> 01:33:35,355
OK, sabiex dawk kollha huma foloz.

2090
01:33:35,355 --> 01:33:38,324

2091
01:33:38,324 --> 01:33:39,490
Nizza.

2092
01:33:39,490 --> 01:33:40,220
[Inaudible]

2093
01:33:40,220 --> 01:33:42,500
Trid titkellem dwar dan?

2094
01:33:42,500 --> 01:33:43,259
Lilkom.

2095
01:33:43,259 --> 01:33:45,050
Davin: Tipi ta 'attakki,
bniedem fin-nofs.

2096
01:33:45,050 --> 01:33:47,134
X'hemm raġel fl-attakk nofs?

2097
01:33:47,134 --> 01:33:48,050
UDJENZA: [inaudible].

2098
01:33:48,050 --> 01:33:51,437

2099
01:33:51,437 --> 01:33:54,020
Davin: Jekk inti tibgħat HTTP
talba, huma jistgħu jagħmlu dan, id-dritt?

2100
01:33:54,020 --> 01:33:57,890
Imma jekk int tibgħat HTTPS, huma
probabbilment mhux se jkunu kapaċi li jagħmlu dan.

2101
01:33:57,890 --> 01:33:59,952
Hemm lottijiet ta 'punti
flimkien konnessjoni tiegħek.

2102
01:33:59,952 --> 01:34:00,660
Inti għandek routers.

2103
01:34:00,660 --> 01:34:01,746
Inti għandek servers DNS.

2104
01:34:01,746 --> 01:34:04,120
Jekk xi ħadd ikun kapaċi fiżikament
tara dak int tibgħat,

2105
01:34:04,120 --> 01:34:06,140
hekk xi ħadd ikun kapaċi
fil-fatt tikseb bejnek,

2106
01:34:06,140 --> 01:34:08,840
il-klijent, u s-server, u huwa
tista 'tara dak li qed tibgħat,

2107
01:34:08,840 --> 01:34:10,298
dan huwa raġel fl-attakk nofs.

2108
01:34:10,298 --> 01:34:14,287
Allura biex tara dak li qed tipprova tikseb mill-
l-server, jew huwa kapaċi li see-- agħar,

2109
01:34:14,287 --> 01:34:16,620
inti tista 'tkun kapaċi li tara
cookies jew xi ħaġa bħal dik.

2110
01:34:16,620 --> 01:34:19,290
>> Għalhekk, per eżempju, jekk
ma tkunx qed tużah SSL, hu

2111
01:34:19,290 --> 01:34:21,900
jista 'jkun kapaċi li tara
cookies tiegħek ID sessjoni.

2112
01:34:21,900 --> 01:34:25,460
U din tissejjaħ sessjoni ħtif
minħabba li hu jara cookies ID tiegħek,

2113
01:34:25,460 --> 01:34:28,317
u mbagħad hu kapaċi li jmorru lil dik
website u nippretendu li tkun int.

2114
01:34:28,317 --> 01:34:31,150
Minħabba eżatt bħal fil PHP, ftakar
meta aħna illoggjat, dak li nagħmlu?

2115
01:34:31,150 --> 01:34:33,340
Waqqafna sessjoni ID ugwali għal ID.

2116
01:34:33,340 --> 01:34:34,810
Allura li jidentifika inti.

2117
01:34:34,810 --> 01:34:38,300
C'est pourquoi inti tista 'tara portafoll tiegħek
u mhux kulħadd elses portafoll.

2118
01:34:38,300 --> 01:34:42,320
>> Ukoll, jekk jien kapaċi tikseb dak il-cookie,
imbagħad I tista 'log fuq dik il-paġna.

2119
01:34:42,320 --> 01:34:45,380
U allura, I tista 'biss tara Jittieħed tiegħek
u tibda xiri u bejgħ Jittieħed.

2120
01:34:45,380 --> 01:34:46,800
Allura dak sessjoni ħtif.

2121
01:34:46,800 --> 01:34:50,810
Imma inti ma għandhom ikunu to-- kapaċi sabiex inti
jistgħu jużaw l-bniedem fl-attakk nofs

2122
01:34:50,810 --> 01:34:52,290
anke jekk dawn qed jużaw SSL.

2123
01:34:52,290 --> 01:34:53,520
Imma inti ma għandhom ikunu kapaċi.

2124
01:34:53,520 --> 01:34:56,580
Jekk huma jużaw SSL,
inti ma tistax sessjoni hijack.

2125
01:34:56,580 --> 01:34:58,927
Għaliex?

2126
01:34:58,927 --> 01:35:01,135
Minħabba dan kollu encrypted,
dritt? jekk huwa encrypted,

2127
01:35:01,135 --> 01:35:03,509
u jien xorta raġel fil-
tan-nofs, I xorta jiksbu data tiegħek.

2128
01:35:03,509 --> 01:35:04,279
Li l-multa.

2129
01:35:04,279 --> 01:35:05,070
Iżda huwa encrypted.

2130
01:35:05,070 --> 01:35:07,750
So I ma tistax verament tużah.

2131
01:35:07,750 --> 01:35:09,840
Allura dak tnejn.

2132
01:35:09,840 --> 01:35:11,544
>> Real malajr, sit cross talba falsifikazzjoni.

2133
01:35:11,544 --> 01:35:13,960
Li jinsab biss jekk ikun hemm rabta
u din ir-rabta ma xi ħaġa

2134
01:35:13,960 --> 01:35:14,890
li inti ma naħsibx li għandhom jagħmlu.

2135
01:35:14,890 --> 01:35:18,150
Għalhekk, per eżempju, jekk il-link kien
ser jixtru ħażniet jew ibigħu l-istokkijiet,

2136
01:35:18,150 --> 01:35:19,360
u inti ma taf dak.

2137
01:35:19,360 --> 01:35:22,040
Inti għafast fuq il-link,
bagħtet talba, mixtrija

2138
01:35:22,040 --> 01:35:24,240
jew mibjugħa xi ħaġa li
inti ma jfissirx li tagħmel.

2139
01:35:24,240 --> 01:35:25,120
Li li.

2140
01:35:25,120 --> 01:35:30,720
>> Scripting sit Cross, hekk hawn,
int tgħaddi fil via q varjabbli,

2141
01:35:30,720 --> 01:35:33,510
minflok tgħaddi f'xi tip
ta 'valur, forsi q huwa bħal isem.

2142
01:35:33,510 --> 01:35:36,560
Allura minflok tgħaddi ugwali q
Davin jew xi ħaġa bħal dik,

2143
01:35:36,560 --> 01:35:38,740
jekk inti ma tuża HTML
Chars speċjali, jekk inti

2144
01:35:38,740 --> 01:35:43,100
ma jaħarbu dan li jagħmlu ċert li huwa
OK, imbagħad I tista 'tgħaddi fil minflok,

2145
01:35:43,100 --> 01:35:46,910
ejja ngħidu fil hawn li jien tgħid
print jew xi ħaġa bħal dik,

2146
01:35:46,910 --> 01:35:51,070
imbagħad I tista 'tgħaddi fil hawn sejħa iskrittura.

2147
01:35:51,070 --> 01:35:53,140
>> Mela allura, minflok ta '
biss jkollna varjabbli,

2148
01:35:53,140 --> 01:35:54,960
Jiena mbagħad tesegwixxi din is-sejħa iskrittura.

2149
01:35:54,960 --> 01:35:57,065
Allura ġewwa li iskrittura
sejħa, dak ma tagħmel?

2150
01:35:57,065 --> 01:36:00,190
Dokument dot post, li għaddej biex
ibiddel il-lok tad-dokument.

2151
01:36:00,190 --> 01:36:02,290
Allura jien ser idawwru
biex x'imkien ieħor.

2152
01:36:02,290 --> 01:36:08,170
Huwa sejjaħ Guy ħażina fl
dan l-eżempju, tajjeb ħafna.

2153
01:36:08,170 --> 01:36:10,536
Ma jista 'jaħseb tal-kelma.

2154
01:36:10,536 --> 01:36:12,410
U mbagħad, x'hemm saħansitra
agħar huwa li jien ser

2155
01:36:12,410 --> 01:36:16,832
li mbagħad stabbiliti cookie, li hija xi
varjabbli Għandi f'din il-website.

2156
01:36:16,832 --> 01:36:19,040
Jien ser tissettja ugwali
għad-dokument dot cookie.

2157
01:36:19,040 --> 01:36:20,660
Għalhekk, jien ser
steal cookie tiegħek.

2158
01:36:20,660 --> 01:36:22,951
U jien ser idawwru
xi informazzjoni biex website

2159
01:36:22,951 --> 01:36:25,120
li inti ma għandhomx ikunu aċċess.

2160
01:36:25,120 --> 01:36:29,250
U dan kollu jiġri għax int
mhux jaħrab dak li inti stajt tidher.

2161
01:36:29,250 --> 01:36:29,910
Yeah?

2162
01:36:29,910 --> 01:36:32,160
>> UDJENZA: Allura biss biex
jagħmluha ċara li, huwa

2163
01:36:32,160 --> 01:36:37,550
vulnerable.com li
hija vulnerabbli għal dan.

2164
01:36:37,550 --> 01:36:39,300
Allura din ir-rabta jistgħu jidhru
fuq kull paġna partikolari.

2165
01:36:39,300 --> 01:36:42,200
Xi ħadd clicks fuq dan,
tmur għall vulnerable.com.

2166
01:36:42,200 --> 01:36:43,700
Għandek cookie biex vulnerable.com.

2167
01:36:43,700 --> 01:36:46,670
Ejja ngħidu Facebook huwa
vulnerabbli, hekk facebook.com.

2168
01:36:46,670 --> 01:36:48,310
Inti għandek cookie tiegħek Facebook.

2169
01:36:48,310 --> 01:36:50,925
X'inhu dan qed tagħmel, int
tmur facebook.com,

2170
01:36:50,925 --> 01:36:53,990
huwa immedjatament ridirezzjonar
inti badguy.com,

2171
01:36:53,990 --> 01:36:57,182
imma inkluż informazzjoni cookie tiegħek.

2172
01:36:57,182 --> 01:36:59,310
Allura huwa rindirizz malajr,
iżda cookie tiegħek Facebook

2173
01:36:59,310 --> 01:37:02,572
huwa inkluż ma 'dak idawwru,
u li l-mod kif dawn [inaudible].

2174
01:37:02,572 --> 01:37:04,280
Gabe: Yeah, hemm
xi affarijiet ħafna tfisser

2175
01:37:04,280 --> 01:37:06,070
li n-nies tista 'tagħmel jekk hemm dan.

2176
01:37:06,070 --> 01:37:09,190
Per eżempju, jekk Facebook permess
kulħadd bidla fl-isem l-utent tiegħek,

2177
01:37:09,190 --> 01:37:11,680
u dawn ma jagħmlu ebda
kontrolli sanità, sabiex inti

2178
01:37:11,680 --> 01:37:16,810
jista daħħal ħaġa JavaScript li
bidliet image tiegħek għal ħamster.

2179
01:37:16,810 --> 01:37:22,590
U li ddaħħal l-istess JavaScript
fis kulħadd li fehmiet paġna tiegħek.

2180
01:37:22,590 --> 01:37:26,400
Allura kulħadd li fehmiet paġna tiegħek
għandha l-istess ħaġa fl-isem l-utent.

2181
01:37:26,400 --> 01:37:30,104
U għaliex dan huwa virus,
li tinfirex b'mod esponenzjali.

2182
01:37:30,104 --> 01:37:32,270
Davin: Aħna ser skip l-aħħar
waħda, u allura aħna qed isir.

2183
01:37:32,270 --> 01:37:34,120
Allura dan huwa biss eżempju ieħor.

2184
01:37:34,120 --> 01:37:36,120
Allura dan huwa dawn mhux qed
jaħarbu tabella SQL tagħhom.

2185
01:37:36,120 --> 01:37:37,090
Allura inti tista 'qatra.

2186
01:37:37,090 --> 01:37:38,805
Allura inti tixtieq li jaħarbu l-affarijiet.

2187
01:37:38,805 --> 01:37:44,010
Dan kien l-eżempju preċedenti
mal-scripting sit cross.

2188
01:37:44,010 --> 01:37:45,430
Jiddispjacini aħna dam ftit tard.

2189
01:37:45,430 --> 01:37:46,870
Għada, sorry!

2190
01:37:46,870 --> 01:37:48,560
Għada, aħna għandna ħinijiet tal-uffiċċju.

2191
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Allura ħinijiet tal-uffiċċju fis Cabbot 8:00-11:00.

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Il-ħinijiet uffiċċju huma
strettament għal mistoqsijiet kwizz.

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