1
00:00:00,000 --> 00:00:05,616

2
00:00:05,616 --> 00:00:07,030
>> HANNAH Blumberg: Hi kulħadd.

3
00:00:07,030 --> 00:00:09,530
Aħna qed tmur biex tibda
biss ftit minuti kmieni

4
00:00:09,530 --> 00:00:11,738
peress li għandna lott kollu
ta 'materjal li tinkiseb permezz.

5
00:00:11,738 --> 00:00:12,790
Jien Hannah.

6
00:00:12,790 --> 00:00:13,865
I'ma TF.

7
00:00:13,865 --> 00:00:16,239
Maria se jingħaqdu
us biss fi ftit minuti.

8
00:00:16,239 --> 00:00:17,560
Hija tgħallem taqsima dritt qabel.

9
00:00:17,560 --> 00:00:19,351
I jgħallmu sezzjoni tal-lemin
wara, hekk aħna qed tmur

10
00:00:19,351 --> 00:00:21,200
li jżomm lill-siegħa u nofs.

11
00:00:21,200 --> 00:00:25,490
>> Allura kif tkun taf tara up here, għandna pjuttost
xi suġġetti ftit għandna bżonn li tikseb permezz,

12
00:00:25,490 --> 00:00:27,200
hekk aħna ser jkunu għaddejjin xi ftit fast.

13
00:00:27,200 --> 00:00:31,140
Iżda jekk fi kwalunkwe punt ngħidu xi ħaġa
wisq malajr jew ma tifhimx,

14
00:00:31,140 --> 00:00:33,170
tħossok liberu li jinterrompu bil-mistoqsijiet.

15
00:00:33,170 --> 00:00:36,610
Aħna rridu li tkun tista 'tagħmel dan
tirrevedi sessjoni utli kollu inti

16
00:00:36,610 --> 00:00:37,973
kemm jista 'jkun.

17
00:00:37,973 --> 00:00:38,920
Tal-biża.

18
00:00:38,920 --> 00:00:41,650
>> Mela ejja jaqbżu dritt ma
xi suġġetti li għandna attwalment

19
00:00:41,650 --> 00:00:46,980
ħafna, koperti fil-qasir ħafna għall-
kwizz 0 fis-sessjoni reviżjoni kwizz 0.

20
00:00:46,980 --> 00:00:48,840
Allura tibda ma 'listi marbuta.

21
00:00:48,840 --> 00:00:52,090
Hekk biss tagħmel ċert li jkollok xi
għarfien bażiku dwar listi marbuta

22
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u huma komdu tagħmel
xi wħud mill-operazzjonijiet bażiċi.

23
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>> Hekk biss biex tirrevedi, marbuta
listi huma aħjar minn arrays

24
00:00:58,560 --> 00:01:01,020
għaliex dawn jistgħu jikbru b'mod dinamiku.

25
00:01:01,020 --> 00:01:03,300
Allura aħna għandna dan il-vantaġġ enormi.

26
00:01:03,300 --> 00:01:06,031
Rajna minnhom użata
fit-tabelli hash meta aħna

27
00:01:06,031 --> 00:01:08,280
ma nafx eżattament kemm
affarijiet aħna qed tmur jridu

28
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li ddaħħal fil istruttura data tagħna.

29
00:01:10,900 --> 00:01:15,700
Sfortunatament, aħna għandna biċċiet ta '
il-lista marbuta madwar memorja,

30
00:01:15,700 --> 00:01:20,820
hekk aħna mhux se neċessarjament
jistgħu jagħmlu l-aċċess ta 'żmien kostanti

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għal kull element fil-lista marbuta.

32
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Sabiex issib
element partikolari, aħna

33
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għandek jtenni l-
mod mill-bidu.

34
00:01:26,510 --> 00:01:30,610
Allura wieħed iżomm f'moħħu li ħafna mill-
operazzjonijiet bażiċi huma omega ta 1.

35
00:01:30,610 --> 00:01:32,130
Allura daħħal huwa biss se tieħu 1.

36
00:01:32,130 --> 00:01:37,520
Ħassar se jieħu n peress li aħna
ikollhom imorru jsibuha mil-lista.

37
00:01:37,520 --> 00:01:39,260
U tfittxija tista 'tieħu, fl-agħar, n.

38
00:01:39,260 --> 00:01:42,330
Aħna ma tistax tagħmel xi ħaġa simili
tfittxija binarju fuq lista marbuta

39
00:01:42,330 --> 00:01:45,101
peress li aħna ma tistax sempliċement
saltwarjament jaqbżu l-nofs.

40
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Kessaħ.

41
00:01:45,600 --> 00:01:48,160

42
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Tal-biża.

43
00:01:48,960 --> 00:01:50,270
>> Ftit ftit ta 'stacks.

44
00:01:50,270 --> 00:01:53,980
Dan, għal darb'oħra, ħarāu fuq kwizz 0, sabiex inti
għandhom ikunu super komdu miegħu.

45
00:01:53,980 --> 00:01:57,210
Iżda għal stacks, aħna nitolbuk
li tiftakar munzell ta 'dixxijiet.

46
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U li għaddej biex tkun l-ewwel fl-aħħar li joħroġ.

47
00:01:59,940 --> 00:02:02,272
Allura aħna munzell affarijiet up
fil-ċmieni, u mbagħad

48
00:02:02,272 --> 00:02:04,980
jekk aħna qed jippruvaw jieħdu xi ħaġa
off-- li aħna sejħa popping off

49
00:02:04,980 --> 00:02:06,581
l stack-- niġu off-quċċata.

50
00:02:06,581 --> 00:02:09,289
U jekk irridu biex xi ħaġa
fil-ċmieni, nagħmlu sejħa hija imbuttar.

51
00:02:09,289 --> 00:02:13,170
Allura huwa dejjem se tkun jikbru
mill-qiegħ bħal munzell ta 'dixxijiet.

52
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Tal-biża.

53
00:02:14,540 --> 00:02:17,607
>> Imxejna stacks tidher implimentati
ma żewġ listi konnessi u arrays.

54
00:02:17,607 --> 00:02:19,440
Jekk inti qed implimentazzjoni
ma arrays, inti tixtieq

55
00:02:19,440 --> 00:02:22,350
biex tagħmel żgur li jżommu rekord ta '
kemm id-daqs u l-kapaċità.

56
00:02:22,350 --> 00:02:27,540
Allura daqs se tkun l-kurrent
numru ta 'affarijiet fil munzell tiegħek,

57
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billi kapaċità huwa n-numru totali
ta 'affarijiet li inti jista' jaħżen fil munzell tiegħek.

58
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Kessaħ.

59
00:02:34,220 --> 00:02:35,767
>> Ħafna bl-istess mod, għandna kjuwijiet.

60
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F'dan il-każ, minflok ta 'ħsieb dwar
munzell ta 'dixxijiet, jaħsbu ta' linja.

61
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Dan se jkun l-ewwel fl-ewwel out.

62
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Mela jekk inti qed lining up għall
xi ħaġa fil-maħżen,

63
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nittamaw li l-persuna l-ewwel fil
linja se tkun megħjuna ewwel.

64
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>> Minflok qal push u
pop bħal nagħmlu għall munzell,

65
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aħna biss jgħidu enqueue u dequeue.

66
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U għal darb'oħra, jekk inti
implimentazzjoni ta 'dan ma' firxa,

67
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għandna bżonn li jżommu rekord
mhux biss id-daqs

68
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u l-kapaċità, iżda wkoll ir-ras, li
se tkun il-quddiem tal-kju tagħna.

69
00:03:02,390 --> 00:03:03,010
Kessaħ.

70
00:03:03,010 --> 00:03:05,770
Kwalunkwe mistoqsijiet dwar xi li?

71
00:03:05,770 --> 00:03:06,320
Tal-biża.

72
00:03:06,320 --> 00:03:07,640
Nimxu dritt flimkien.

73
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>> OK, tabelli hash.

74
00:03:08,564 --> 00:03:10,605
Hawn fejn jibda
jiksbu verament interessanti.

75
00:03:10,605 --> 00:03:14,150
Allura tabella hash hija implimentazzjoni waħda
ta 'firxa assoċjattiva.

76
00:03:14,150 --> 00:03:16,700
Allura bażikament dak li ġara
huwa għandna dan kollu input,

77
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u nagħtu lil hash
funzjoni li jgħid,

78
00:03:18,750 --> 00:03:21,840
OK, dan huwa fejn fil-
tabella hash jappartjeni.

79
00:03:21,840 --> 00:03:24,860
>> Allura l-funzjoni hash sempliċi
li Rajna huwa biss qal,

80
00:03:24,860 --> 00:03:28,170
OK, ejja ngħidu aħna tixtieq li tqiegħed
kordi fit-tabella hash tagħna.

81
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U idea verament sempliċi
jista 'jkun li jgħidu, OK,

82
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ejja biss sort mill-
ewwel ittra tal-kelma.

83
00:03:34,350 --> 00:03:37,570
Allura tista 'tara hawn, nieħdu banana,
aħna poġġih permezz ta 'funzjoni hash,

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u jgħid, ħej, li
għandhom imorru fi indiċi 1.

85
00:03:40,190 --> 00:03:45,120
>> Allura nistgħu essenzjalment jaħsbu ta 'hash
tabella kif mazz ta 'bramel differenti.

86
00:03:45,120 --> 00:03:49,880
U kull wieħed minn dawn bramel qed jiġri
li jżommu l-kap ta 'lista marbuta.

87
00:03:49,880 --> 00:03:55,030
U f'dik il-lista marbuta huwa fejn nistgħu
fil-fatt imqiegħda biċċiet differenti ta 'data.

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00:03:55,030 --> 00:03:57,820
>> Allura għadis ftit aktar
fi funzjoni hash, hawn

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00:03:57,820 --> 00:03:59,870
l-eżempju I biss
deskritti fejn aħna biss jgħidu,

90
00:03:59,870 --> 00:04:02,460
OK, jieħdu l-ewwel ittra
tal-kelma u aħna qed

91
00:04:02,460 --> 00:04:03,990
se sort fil-bramel.

92
00:04:03,990 --> 00:04:08,490
Allura preżumibbilment, se jkun hemm 26 bramel,
wieħed għal kull ittra tal-alfabett.

93
00:04:08,490 --> 00:04:10,090
Għaliex hija le dan funzjoni hash kbira?

94
00:04:10,090 --> 00:04:13,461
X'jagħmel din non-ideal?

95
00:04:13,461 --> 00:04:13,960
Yeah.

96
00:04:13,960 --> 00:04:15,790
>> UDJENZA: Inti qed tmur
li jkollhom kolliżjonijiet.

97
00:04:15,790 --> 00:04:16,390
>> HANNAH Blumberg: Yeah, eżattament.

98
00:04:16,390 --> 00:04:18,000
Inti qed tmur biex ikollhom kolliżjonijiet.

99
00:04:18,000 --> 00:04:18,954
Allura dak ħaġa waħda.

100
00:04:18,954 --> 00:04:21,620
U aħna ser nitkellmu dwar kif nistgħu
jiffissaw kolliżjonijiet fi ftit tieni.

101
00:04:21,620 --> 00:04:23,980
Problema oħra ma 'dan
funzjoni hash

102
00:04:23,980 --> 00:04:25,980
hija li differenti tagħna
bramel ser ikunu

103
00:04:25,980 --> 00:04:28,960
daqsijiet ta 'pretty drastikament differenti.

104
00:04:28,960 --> 00:04:33,840
>> Nafu li hemm lott kollu
aktar kliem li tibda bil-minn X,

105
00:04:33,840 --> 00:04:38,980
hekk aħna qed tmur biex ikollhom ħafna
bramel żbilanċjat fit-tabella hash tagħna.

106
00:04:38,980 --> 00:04:40,050
Kessaħ.

107
00:04:40,050 --> 00:04:41,340
So yeah, ejja nikseb lura għall
il-punt ta 'kolliżjonijiet.

108
00:04:41,340 --> 00:04:42,900
X'nagħmlu jekk ikun hemm xi ħabta?

109
00:04:42,900 --> 00:04:44,490
>> Għandna koppja għażliet differenti.

110
00:04:44,490 --> 00:04:47,600
Allura wieħed, hekk ejja ngħidu aħna qed jippruvaw
li jpoġġu berry fis-mejda hash tagħna.

111
00:04:47,600 --> 00:04:50,370
U naraw, oh, irridu
li tqiegħed lilha fl-indiċi 1,

112
00:04:50,370 --> 00:04:52,070
iżda banana diġà jgħix hemm.

113
00:04:52,070 --> 00:04:53,110
Liema huma aħna se jagħmlu?

114
00:04:53,110 --> 00:04:54,560
Għandna żewġ għażliet prinċipali.

115
00:04:54,560 --> 00:04:58,050
>> Numru wieħed huwa nistgħu ngħidu, OK,
hemm l-ebda kamra indiċi 1,

116
00:04:58,050 --> 00:05:03,210
imma ejja biss iżommu tfittex permezz
sakemm nistgħu nsibu post miftuħ ieħor.

117
00:05:03,210 --> 00:05:08,490
Allura aħna ser ngħidu, OK,
ejja poġġih fil-post 3.

118
00:05:08,490 --> 00:05:09,240
C'est għażla waħda.

119
00:05:09,240 --> 00:05:11,470
Li sejjaħ lineari probing.

120
00:05:11,470 --> 00:05:15,500
>> U t-tieni għażla huwa qal, OK, ukoll,
ejja biss tagħmel kull wieħed minn dawn bramel

121
00:05:15,500 --> 00:05:17,470
ikunu kapijiet ta 'listi marbuta.

122
00:05:17,470 --> 00:05:21,910
U huwa OK jekk ikun hemm aktar
minn ħaġa waħda fil-barmil.

123
00:05:21,910 --> 00:05:23,820
Aħna biss se
tehmeż hija fuq il-front.

124
00:05:23,820 --> 00:05:26,032
Allura hawn tistgħu taraw, OK,
meta aħna jiddaħħal berry, aħna

125
00:05:26,032 --> 00:05:28,240
biss ħa banana, tip ta '
imbuttat dan matul ftit

126
00:05:28,240 --> 00:05:29,842
u threw berry fil hemmhekk.

127
00:05:29,842 --> 00:05:31,050
U li wkoll totalment multa.

128
00:05:31,050 --> 00:05:32,830
Din tissejjaħ chaining separata.

129
00:05:32,830 --> 00:05:38,100
Inti tista 'taħseb ta' dan bħala tip simili
firxa ta 'kapijiet għal-listi marbuta.

130
00:05:38,100 --> 00:05:41,950
Kwalunkwe mistoqsijiet dwar hash
tabelli, funzjonijiet hash?

131
00:05:41,950 --> 00:05:44,290
Tal-biża.

132
00:05:44,290 --> 00:05:45,470
>> Siġar u tipprova.

133
00:05:45,470 --> 00:05:47,287
Allura siġra huwa kwalunkwe tip
tal-istruttura tad-data

134
00:05:47,287 --> 00:05:49,453
fejn hemm xi tip
tal ġerarkija jew xi tip

135
00:05:49,453 --> 00:05:51,247
ta 'klassifikazzjoni għal oġġetti differenti tiegħek.

136
00:05:51,247 --> 00:05:53,580
U dan se jsir super
ċara meta naraw eżempju.

137
00:05:53,580 --> 00:05:56,960
U rajna tentattivi, flimkien
ma 'tabelli hash, fil pset5--

138
00:05:56,960 --> 00:06:00,700
li, għal darb'oħra, logħba totalment ġust
għal dan quiz-- bħala data ieħor

139
00:06:00,700 --> 00:06:03,110
strutturi li nistgħu
jaħżnu l-affarijiet differenti.

140
00:06:03,110 --> 00:06:06,782
Fil-każ ta 'dizzjunarju,
aħna maħżuna mazz ta 'kliem.

141
00:06:06,782 --> 00:06:08,240
Mela ejja tagħti ħarsa lejn xi siġar.

142
00:06:08,240 --> 00:06:10,190
Allura dan huwa eżempju ta 'siġra.

143
00:06:10,190 --> 00:06:13,105
Hija għandha tip ta 'struttura,
dik l-istruttura ġerarkika,

144
00:06:13,105 --> 00:06:15,920
fejn tista 'tara li
dan node 1 fil-quċċata

145
00:06:15,920 --> 00:06:20,750
għandu xi tip ta 'rank fuq minn 2 u 3,
li huma 'l fuq 4, 5, u 6 u 7,

146
00:06:20,750 --> 00:06:22,860
li huma 'l fuq 8 u 9.

147
00:06:22,860 --> 00:06:25,210
Allura li kollox rridu nfissru minn
siġra, sabiex inti tista 'sempliċement tip

148
00:06:25,210 --> 00:06:26,660
ta 'stampa dan fir-ras.

149
00:06:26,660 --> 00:06:29,050
>> Issa, għandna ftit
Siġar aktar speċjalizzati.

150
00:06:29,050 --> 00:06:31,070
Allura eżempju wieħed hija siġra binarju.

151
00:06:31,070 --> 00:06:33,290
U siġra binarju huwa,
għal darb'oħra, biss ser tkun

152
00:06:33,290 --> 00:06:37,040
struttura data ma 'xi tip ta'
ġerarkija, iżda kull wieħed mill-lymph

153
00:06:37,040 --> 00:06:38,650
jista 'jkollhom mhux iktar żewġt itfal.

154
00:06:38,650 --> 00:06:41,530
Li meta l-binarju kelma ġejja mill.

155
00:06:41,530 --> 00:06:43,410
Allura dan huwa eżempju ta 'siġra binarju.

156
00:06:43,410 --> 00:06:45,720
Allura dak kategorija iżgħar ta 'siġar.

157
00:06:45,720 --> 00:06:48,960
>> Issa ejja nikseb saħansitra aktar speċifiċi u
jitkellmu dwar tfittxija binarja trees-- binarja

158
00:06:48,960 --> 00:06:51,310
siġar, pjuttost.

159
00:06:51,310 --> 00:06:56,430
Allura hawnhekk l-idea mhix biss ma
kull node jkollhom mill-aktar żewġt itfal,

160
00:06:56,430 --> 00:07:00,300
iżda kollha tat-tfal għall-
xellug ser ikunu iżgħar

161
00:07:00,300 --> 00:07:03,450
u kollha tat-tfal għall-
dritt ser ikunu akbar.

162
00:07:03,450 --> 00:07:05,890
Allura avviż fil biss tagħna
siġra binarju, hemm

163
00:07:05,890 --> 00:07:08,650
ebda relazzjoni bejn in-numri.

164
00:07:08,650 --> 00:07:12,990
Iżda fit-tfittxija binarja tagħna
siġra, naraw, OK, hawn 44.

165
00:07:12,990 --> 00:07:17,080
U kull numru ix-xellug tal 44 huwa
kollox iżgħar u lejn il-lemin

166
00:07:17,080 --> 00:07:17,920
huwa akbar.

167
00:07:17,920 --> 00:07:20,130
>> U li jkollha f'kull
livell tas-siġra.

168
00:07:20,130 --> 00:07:24,810
Allura hawnhekk, dan huwa iżgħar minn
22 u dan huwa ikbar minn 22.

169
00:07:24,810 --> 00:07:26,390
U li siġra tfittxija binarja.

170
00:07:26,390 --> 00:07:28,900
Għaliex aħna naħsbu huwa msejjaħ
siġra tfittxija binarju?

171
00:07:28,900 --> 00:07:30,651
Dak algoritmu ma infakkarkom ta '?

172
00:07:30,651 --> 00:07:31,650
UDJENZA: tfittxija Binarju.

173
00:07:31,650 --> 00:07:32,480
HANNAH Blumberg: tfittxija Binarju.

174
00:07:32,480 --> 00:07:35,150
Għaliex jekk inti qed tfittex għal
Numru partikolari din is-siġra,

175
00:07:35,150 --> 00:07:38,800
f'kull punt, inti tista 'sempliċement knock
nofs off tas-siġra, li hija kbira.

176
00:07:38,800 --> 00:07:43,800
U hekk li għaddej biex tagħtina xi ħaġa
li jistenna ħafna bħall tfittxija binarja.

177
00:07:43,800 --> 00:07:45,870
Kwalunkwe mistoqsijiet?

178
00:07:45,870 --> 00:07:47,570
Dritt kollha, berred.

179
00:07:47,570 --> 00:07:48,560
>> Id-dritt, jipprova.

180
00:07:48,560 --> 00:07:49,657
Favoriti kulħadd.

181
00:07:49,657 --> 00:07:51,990
Allura dan huwa l-eżempju li
Rajna mazz fil-klassi.

182
00:07:51,990 --> 00:07:54,710
U għal darb'oħra, dan huwa biss ieħor
mod li nistgħu jaħżen id-data.

183
00:07:54,710 --> 00:07:57,530
Fil-każ ta 'dizzjunarju, għal darb'oħra,
dan huwa biss se tkun kordi.

184
00:07:57,530 --> 00:08:00,870
Mela ejja ara dak li dan fil-fatt
qisu f'livell kemmxejn aktar baxx.

185
00:08:00,870 --> 00:08:03,690
>> Mela ejja tagħti ħarsa
fil node wieħed fil-trie.

186
00:08:03,690 --> 00:08:07,532
U naraw, OK, hemm għaddej
li jkun Boolean u node,

187
00:08:07,532 --> 00:08:09,170
a pointer għal node.

188
00:08:09,170 --> 00:08:11,400
U naraw li l-
Boolean huwa msejjaħ is_word.

189
00:08:11,400 --> 00:08:13,490
Allura essenzjalment, li l-
se jikkorrispondu

190
00:08:13,490 --> 00:08:16,750
għal dawn triangoli ftit li
jgħid, jekk inti stajt gotten hawn,

191
00:08:16,750 --> 00:08:19,100
inti ħadthom misjuba kelma kompluta.

192
00:08:19,100 --> 00:08:23,670
>> Aħna nafu li "Turing" fuq
hawnhekk hija kelma kompluta,

193
00:08:23,670 --> 00:08:28,030
billi biss T-U-R mhijiex kelma
għaliex aħna ma tara li delta ftit.

194
00:08:28,030 --> 00:08:31,440
U li delta ftit, għal darb'oħra,
jikkorrispondi għal din is_word,

195
00:08:31,440 --> 00:08:34,480
dan is_word Boolean.

196
00:08:34,480 --> 00:08:36,320
U allura għandna firxa ta 'tfal.

197
00:08:36,320 --> 00:08:39,860
Allura f'kull livell, inti
jkollhom node partikolari,

198
00:08:39,860 --> 00:08:42,470
u li l-punti node lil
firxa ta 'l-alfabett kollu.

199
00:08:42,470 --> 00:08:44,346
>> Allura tista 'tara, għal darb'oħra,
f'dan picture-- jien

200
00:08:44,346 --> 00:08:48,170
ser iżommu jaqbeż lura u
forth-- li dan array fil-quċċata

201
00:08:48,170 --> 00:08:51,640
għandha mazz ta 'differenti
lymph li ġejjin off ta 'dan.

202
00:08:51,640 --> 00:08:57,140
Hija għandha 26, jew 27 jekk inti tixtieq
li jinkludu karattru żejda.

203
00:08:57,140 --> 00:09:01,320
U dan jagħtina
mod biex jaħżnu data tagħna

204
00:09:01,320 --> 00:09:04,450
b'mod li jista 'jiġi meqjus fuq
li inti tista 'tfittex up super fast.

205
00:09:04,450 --> 00:09:06,650
X'inhu l-ħin lookup għal trie?

206
00:09:06,650 --> 00:09:07,970
>> UDJENZA: [inaudible].

207
00:09:07,970 --> 00:09:08,300
>> HANNAH Blumberg: Yeah.

208
00:09:08,300 --> 00:09:09,550
Fit-teorija, wasal iż-żmien kostanti.

209
00:09:09,550 --> 00:09:13,230
Huwa biss se jkun id-daqs ta '
il-kelma li inti tixtieq li tfittex up.

210
00:09:13,230 --> 00:09:15,950
Anki jekk aħna żid zillion
Kliem aktar għall trie tagħna,

211
00:09:15,950 --> 00:09:18,160
mhuwiex ser tieħu us
aktar biex jiddeterminaw

212
00:09:18,160 --> 00:09:19,690
jekk kelma partikolari huwa fil-trie.

213
00:09:19,690 --> 00:09:21,412
Allura li tassew sbieħ.

214
00:09:21,412 --> 00:09:23,697
>> UDJENZA: Ridt biss
initialize li array?

215
00:09:23,697 --> 00:09:24,780
Tkun insejt punt jew tnejn.

216
00:09:24,780 --> 00:09:26,130
Tista biss jitkellmu dwar
li għat-tieni?

217
00:09:26,130 --> 00:09:26,680
>> HANNAH Blumberg: Sure, assolutament.

218
00:09:26,680 --> 00:09:27,590
Tajba kwistjoni.

219
00:09:27,590 --> 00:09:31,140
Il-kwistjoni kienet, aħna
jkollhom firxa li l-

220
00:09:31,140 --> 00:09:34,180
ser ikollhom star node bħala
kuntrarju biss node, right?

221
00:09:34,180 --> 00:09:35,180
Kessaħ.

222
00:09:35,180 --> 00:09:37,990
Allura hawnhekk dak li aħna qed tgħid
huwa array tagħna huwa biss

223
00:09:37,990 --> 00:09:40,035
se tkun pointers għal arrays oħra.

224
00:09:40,035 --> 00:09:42,910
Allura huwa essentially-- it-tip ta '
iħoss bħal lista marbut b'dan il-mod

225
00:09:42,910 --> 00:09:46,620
fejn kull wieħed minn dawn it-tfal
biss il-punt li l-node li jmiss.

226
00:09:46,620 --> 00:09:49,030
>> U l-mod li aħna
fil-fatt jiddeterminaw, ħej, OK,

227
00:09:49,030 --> 00:09:52,320
konna tenna permezz ta 'kollu
kelma, huwa din il-kelma fid-dizzjunarju,

228
00:09:52,320 --> 00:09:54,476
aħna biss tivverifika din is_word.

229
00:09:54,476 --> 00:09:55,100
Kwistjoni kbira.

230
00:09:55,100 --> 00:09:55,675
Yeah.

231
00:09:55,675 --> 00:09:56,216
UDJENZA: OK.

232
00:09:56,216 --> 00:09:57,470
Allura dak li kien il-runtime għall-trie?

233
00:09:57,470 --> 00:09:58,386
>> HANNAH Blumberg: Sure.

234
00:09:58,386 --> 00:10:01,852
Allura l-runtime għal trie għall
lookup se jkun żmien kostanti.

235
00:10:01,852 --> 00:10:04,310
Allura huwa biss se tkun l-
numru ta 'ittri fil-kelma.

236
00:10:04,310 --> 00:10:06,310
Mhuwiex dipendenti fuq il-
daqs tal--dizzjunarju

237
00:10:06,310 --> 00:10:09,510
jew id-daqs tal-istruttura tad-data.

238
00:10:09,510 --> 00:10:12,170
Allura hawnhekk huwa eżempju kemmxejn aktar sempliċi.

239
00:10:12,170 --> 00:10:15,430
>> F'dan il-każ, tista 'tara li
l-BAT kelma hija fid-dizzjunarju

240
00:10:15,430 --> 00:10:18,900
u inti għandek zoom, imma int
ma jkollhomx xi ħaġa bħal zoo.

241
00:10:18,900 --> 00:10:20,050
Kif nagħmlu zoo?

242
00:10:20,050 --> 00:10:24,276
Kif nistgħu żid zoo għall tagħna
dizzjunarju, li trie tagħna?

243
00:10:24,276 --> 00:10:24,776
Yeah.

244
00:10:24,776 --> 00:10:27,014
>> UDJENZA: Għamla is_word
veru għall-[inaudible].

245
00:10:27,014 --> 00:10:27,930
HANNAH Blumberg: Tajba.

246
00:10:27,930 --> 00:10:31,731
Allura aħna jgħidu Z-O-O, u allura aħna d
tkun trid tivverifika off-kaxxa kif ukoll.

247
00:10:31,731 --> 00:10:32,230
Great.

248
00:10:32,230 --> 00:10:35,160

249
00:10:35,160 --> 00:10:37,930
Ejja jqabblu fil-qasir ħafna
jipprova versus tabelli hash.

250
00:10:37,930 --> 00:10:39,770
Jipprova huma verament kbir
għaliex, kif għidna,

251
00:10:39,770 --> 00:10:41,610
dawn jipprovdu lookup kostanti-time.

252
00:10:41,610 --> 00:10:44,285
Iżda l-iżvantaġġ enormi
huwa li qed humongous.

253
00:10:44,285 --> 00:10:46,160
Tista 'tikseb l-sens,
anki billi tħares lejn din,

254
00:10:46,160 --> 00:10:48,454
li għaddej biex tieħu
ammont kbir ta 'memorja.

255
00:10:48,454 --> 00:10:50,620
Allura dawn qed tmur biex tkun ferm
akbar minn tabelli hash,

256
00:10:50,620 --> 00:10:52,270
iżda dawn qed tmur biex jagħti
us drabi lookup ħafna aktar mgħaġġla.

257
00:10:52,270 --> 00:10:54,478
Allura dak it-tip ta tiegħek
tradeoff, dak li inti care about,

258
00:10:54,478 --> 00:10:57,350
jekk huwa veloċità jew memorja.

259
00:10:57,350 --> 00:11:02,251
Kwalunkwe mistoqsijiet dwar xi li,
kollha tal-istrutturi tad-data C.

260
00:11:02,251 --> 00:11:02,750
Beautiful.

261
00:11:02,750 --> 00:11:03,250
KOLLOX SEW.

262
00:11:03,250 --> 00:11:07,322
Aħna qed tmur biex jimxu fuq ftit
daqsxejn ta 'web iżvilupp ma Maria.

263
00:11:07,322 --> 00:11:08,280
MARIA ZLATKOVA: sabiħ.

264
00:11:08,280 --> 00:11:09,036
KOLLOX SEW.

265
00:11:09,036 --> 00:11:10,380
>> HANNAH Blumberg: Tista 'tuża laptop tiegħi.

266
00:11:10,380 --> 00:11:11,255
>> MARIA ZLATKOVA: Nizza.

267
00:11:11,255 --> 00:11:13,320

268
00:11:13,320 --> 00:11:14,912
OK, berred.

269
00:11:14,912 --> 00:11:17,120
Hekk kif nersqu issa li web
iżvilupp, tkellimna ftit

270
00:11:17,120 --> 00:11:20,680
dwar permessi jinbidlu
ta 'fajls u direttorji

271
00:11:20,680 --> 00:11:24,190
sabiex ikunu jistgħu jkunu aċċessibbli
lil utenti oħra, għad-dinja,

272
00:11:24,190 --> 00:11:28,640
u sabiex inkunu nistgħu naraw kif
bażikament nistgħu jwassalhom

273
00:11:28,640 --> 00:11:32,600
meta niżviluppaw affarijiet simili websites
li konna aktar qed tagħmel.

274
00:11:32,600 --> 00:11:36,400
>> Allura rajna l-kmand chmod,
li huwa mod bidla, bażikament.

275
00:11:36,400 --> 00:11:39,300
Li l-kmand Linux u
tbiddel permessi aċċess

276
00:11:39,300 --> 00:11:40,410
ta 'oġġetti fajl sistema.

277
00:11:40,410 --> 00:11:43,370
U oġġett fajl sistema hija
biss direttorju, fajl,

278
00:11:43,370 --> 00:11:46,810
xi ħaġa li inti tista '
jibdlu l-permessi ta '.

279
00:11:46,810 --> 00:11:53,750
>> Allura biex tara d-permessi fajl,
aħna tip-kmand ls, lista, -l.

280
00:11:53,750 --> 00:11:56,500
U meta aħna tip li, aħna
normalment tara xi permessi

281
00:11:56,500 --> 00:11:59,660
li look tip ta 'bħal dan
quddiem ta 'isem id-direttorju.

282
00:11:59,660 --> 00:12:01,260
Allura d jirreferi għal direttorju.

283
00:12:01,260 --> 00:12:05,930
U allura għandna tliet
triads li bażikament

284
00:12:05,930 --> 00:12:11,675
jirreferu għall-permessi ta 'kwalunkwe
utent, grupp, jew fid-dinja.

285
00:12:11,675 --> 00:12:16,490
>> It-tipi ta 'permessi li nistgħu
jkollhom għal dawn it-tliet gruppi ta 'nies

286
00:12:16,490 --> 00:12:20,830
huma jew r għall read, w għall
jiktbu, u x għat tesegwixxi.

287
00:12:20,830 --> 00:12:23,650
U li jista 'jkollna dawk
il-grupp u dinja kif ukoll.

288
00:12:23,650 --> 00:12:26,940
Il-ħaġa delikata hija li xi kultant
meta aħna tip-kmand chmod,

289
00:12:26,940 --> 00:12:32,960
aħna tip xi numru
li kien jikkonsisti fi tliet bits.

290
00:12:32,960 --> 00:12:36,990
Allura stajna nagħmlu bħal
777 u li bażikament

291
00:12:36,990 --> 00:12:40,450
imsemmi-valur miżjud
ta 'kull wieħed minn dawn triads

292
00:12:40,450 --> 00:12:45,060
minħabba r jirreferi sa 4, w kieku
jirreferu għal 2, u x jirreferi għal 1,

293
00:12:45,060 --> 00:12:50,020
hekk meta magħduda flimkien, kull wieħed mill-numri
se tinżel għal numru kumulattiv

294
00:12:50,020 --> 00:12:52,750
għal valur kumulattiv bejn 0 u 7.

295
00:12:52,750 --> 00:12:55,150
Allura nistgħu wkoll ikollhom 0
għal mhux permessi fil-livelli kollha.

296
00:12:55,150 --> 00:12:58,200
U li bażikament tagħtina
l-permessi jew għall-utent,

297
00:12:58,200 --> 00:13:00,450
il-grupp, jew fid-dinja.

298
00:13:00,450 --> 00:13:02,620
Kwalunkwe mistoqsijiet dwar dan s'issa?

299
00:13:02,620 --> 00:13:05,331
>> UDJENZA: Inti qal taqra kien 4?

300
00:13:05,331 --> 00:13:06,164
MARIA ZLATKOVA: Iva.

301
00:13:06,164 --> 00:13:07,568
UDJENZA: [inaudible].

302
00:13:07,568 --> 00:13:08,504
HANNAH Blumberg: Yup.

303
00:13:08,504 --> 00:13:11,790
UDJENZA: U mbagħad billi żżid dawk kollha
oħrajn indika n-numru tiegħek.

304
00:13:11,790 --> 00:13:12,665
MARIA ZLATKOVA: Yeah.

305
00:13:12,665 --> 00:13:14,970
Yeah.

306
00:13:14,970 --> 00:13:17,810
Dawn huma mistoqsijiet kbar.

307
00:13:17,810 --> 00:13:20,490
Sabiħ.

308
00:13:20,490 --> 00:13:25,340
Sussegwentement, aħna qabża fil HTML u
ftit aktar dwar web iżvilupp.

309
00:13:25,340 --> 00:13:27,990
Allura HTML ifisser biss
HyperText Markup Language.

310
00:13:27,990 --> 00:13:30,460
U dan huwa l-awment
lingwa li huwa standard

311
00:13:30,460 --> 00:13:32,720
li huwa użat biex toħloq paġni tal-web.

312
00:13:32,720 --> 00:13:35,750
>> Huwa sejjaħ lingwa markup
għaliex mhuwiex attwalment ikkompilati.

313
00:13:35,750 --> 00:13:40,310
Ma jgħidu kif xi kodiċi għandhom
jiġu esegwiti jew xi ħaġa bħal dik.

314
00:13:40,310 --> 00:13:44,800
Hija biss jiddelinea u
jiddeskrivi kif web

315
00:13:44,800 --> 00:13:46,840
paġna għandha tiġi stabbilita
ma 'kull wieħed elementi tagħha

316
00:13:46,840 --> 00:13:48,460
u kif għandhom iħarsu lejn l-utent.

317
00:13:48,460 --> 00:13:53,090

318
00:13:53,090 --> 00:13:57,110
>> Uħud mill-tags HTML li aħna
marru fuq huma dawn li ġejjin.

319
00:13:57,110 --> 00:14:00,500
Kollha ta 'dokumenti HTML tagħna
beda bil-html DOCTYPE.

320
00:14:00,500 --> 00:14:02,550
Imbagħad aħna dejjem ikollhom il-lametta html.

321
00:14:02,550 --> 00:14:03,930
Għandna ras u korp.

322
00:14:03,930 --> 00:14:07,890
U huwa importanti li HTML għandha
dan it-tip ta 'struttura nested

323
00:14:07,890 --> 00:14:09,280
għaliex dan huwa ċar ħafna.

324
00:14:09,280 --> 00:14:13,200
U imbagħad isir ċar ħafna meta aħna
bżonn li jinfetaħ u fil-fatt tags qrib.

325
00:14:13,200 --> 00:14:18,400
U aħna dejjem bżonn li tagħlaq
tags li konna miftuħa.

326
00:14:18,400 --> 00:14:23,170
>> U hawn aħna għandna xi wħud mill-tipi
ta 'affarijiet li ġejjin li rridu li jkollhom.

327
00:14:23,170 --> 00:14:26,580
Allura aħna għandna, per eżempju,
it-titolu ta 'CS50.

328
00:14:26,580 --> 00:14:31,980
U allura aħna fil-fatt
tista 'rabta folja stil

329
00:14:31,980 --> 00:14:34,030
li jiddefinixxi kif aħna stil websajt tagħna.

330
00:14:34,030 --> 00:14:35,650
Dan huwa CSS.

331
00:14:35,650 --> 00:14:39,320
Aħna qed tmur biex jmorru fuq fil-
koppja li jmiss ta 'slajds ukoll.

332
00:14:39,320 --> 00:14:42,580
>> Fi ħdan il-korp, aħna waqqafna
xi klassijiet u IDs.

333
00:14:42,580 --> 00:14:45,860
U bħala tfakkira, għal darb'oħra,
IDs huma uniċi u l-klassijiet

334
00:14:45,860 --> 00:14:47,390
jista 'jiġi assenjat għal oġġetti multipli.

335
00:14:47,390 --> 00:14:52,110
U dan ifisser biss li
nistgħu nużaw klassijiet u IDs

336
00:14:52,110 --> 00:14:55,860
fi ħdan structures-- oħra hekk, għal
eżempju, fil-fajls CSS jew stil

337
00:14:55,860 --> 00:15:00,940
sheets-- li jirreferu għal elementi speċifiċi
u bażikament jgħidu li aħna rridu li stil

338
00:15:00,940 --> 00:15:03,280
jew disinn xi element
b'xi mod partikolari.

339
00:15:03,280 --> 00:15:06,440
U aħna nirreferu għalihom minn
IDs tagħhom u l-klassijiet.

340
00:15:06,440 --> 00:15:09,870
U nistgħu wkoll jirreferi għal
affarijiet differenti minn tags kif ukoll,

341
00:15:09,870 --> 00:15:13,830
iżda IDs u l-klassijiet biss tagħtina xi
versatilità u dak speċifikament aħna

342
00:15:13,830 --> 00:15:15,850
tixtieq li jirreferu għal.

343
00:15:15,850 --> 00:15:19,620
>> Hekk biss eżempju.

344
00:15:19,620 --> 00:15:22,730
Nistgħu, għal darb'oħra, fil
fajl CSS fejn aħna

345
00:15:22,730 --> 00:15:25,770
jridu jiġu definiti xi
style-- hekk kuluri, fonts,

346
00:15:25,770 --> 00:15:30,340
u għalf bħal that-- nistgħu
jiddefinixxu l-istil għal korp.

347
00:15:30,340 --> 00:15:32,640
Allura li jiddefinixxihiex
għall-tag ġisem kollu.

348
00:15:32,640 --> 00:15:36,160
Iżda mbagħad nistgħu wkoll tiddefinixxi
stil għal #title.

349
00:15:36,160 --> 00:15:40,390
U għal darb'oħra, il-hashtag jirreferi għall tagħna
ID u l-dot jirreferi għall-klassi tagħna.

350
00:15:40,390 --> 00:15:44,760
>> U mbagħad għall-info, aħna
jistgħu wkoll jistabbilixxu xi attributi.

351
00:15:44,760 --> 00:15:49,750
U għal darb'oħra, meta immorru lura, kellna tagħna
klassi imsejħa info u titolu ID tagħna.

352
00:15:49,750 --> 00:15:53,422
U nistgħu naraw li aħna nirreferu
lilhom mill #title u info.

353
00:15:53,422 --> 00:15:55,380
UDJENZA: Would you say
hashtag [? jadotta me? ?]

354
00:15:55,380 --> 00:15:55,725
MARIA ZLATKOVA: Jiddispjacini?

355
00:15:55,725 --> 00:15:58,120
UDJENZA: Would you say
hashtag [? jadotta me? ?]

356
00:15:58,120 --> 00:16:01,400
MARIA ZLATKOVA: hashtag
ifisser ID, hekk #title

357
00:16:01,400 --> 00:16:07,890
jirreferi għall indipendentement mill-elementi
jkollhom din ID imsejħa titolu.

358
00:16:07,890 --> 00:16:10,735
U allura l-dot jirreferi għal klassi.

359
00:16:10,735 --> 00:16:14,590
Allura info tirreferi għal dan l-element
minħabba li għandha l-info klassi.

360
00:16:14,590 --> 00:16:15,090
Yup.

361
00:16:15,090 --> 00:16:17,905
>> UDJENZA: Għaliex inti
jiddistingwuhom fil-HTML?

362
00:16:17,905 --> 00:16:20,985
Għaliex do you say ċerti affarijiet huma
IDs u ċerti affarijiet huma klassi?

363
00:16:20,985 --> 00:16:22,610
MARIA ZLATKOVA: Li jinsab biss sa you--

364
00:16:22,610 --> 00:16:24,151
HANNAH Blumberg: Irrepeti l-kwistjoni.

365
00:16:24,151 --> 00:16:25,370
MARIA ZLATKOVA: Oh, sorry.

366
00:16:25,370 --> 00:16:29,480
Għalfejn nagħmlu distinzjoni ċerti elementi
kif IDs u elementi oħra bħala klassijiet?

367
00:16:29,480 --> 00:16:34,760
Li jinsab biss għaliex dan huwa
verament spiss għażla disinn.

368
00:16:34,760 --> 00:16:38,520
Dan jagħtik ħafna ta '
versatilità li jkunu

369
00:16:38,520 --> 00:16:43,250
tista 'tgħid Irrid din il-partita speċifika
li jkollhom din ID minħabba li jkunu jridu

370
00:16:43,250 --> 00:16:45,300
li tagħmel ħafna affarijiet
magħha, u I biss

371
00:16:45,300 --> 00:16:50,010
tixtieq li jiddefinixxu stil, ċertu stil
jew kulur ikun x'ikun għal dak l-oġġett.

372
00:16:50,010 --> 00:16:52,630
U l-mod biex tagħmel dan
huwa biss tatha ID.

373
00:16:52,630 --> 00:16:55,060
>> U mbagħad jekk nixtieq li jkollhom
koppja ta 'oġġetti differenti

374
00:16:55,060 --> 00:16:58,940
li li, minflok
għaddejjin u l-istabbiliment their--

375
00:16:58,940 --> 00:17:03,840
minflok tagħmel dan billi
tag minħabba l-tikketta se

376
00:17:03,840 --> 00:17:07,369
jistabbilixxu l-ċellola għall-tikketta kollu
għal kull darba li tag huwa użat,

377
00:17:07,369 --> 00:17:09,740
inti tista 'tistabbilixxi klassi għal oġġetti multipli.

378
00:17:09,740 --> 00:17:15,109
U mbagħad biss aċċess dik il-klassi u jgħidu
Irrid stil din il-klassi li mod.

379
00:17:15,109 --> 00:17:17,579
>> U għal darb'oħra, il-klassi jista
ikunu unitajiet differenti multipli

380
00:17:17,579 --> 00:17:21,150
u l-ID għandu jkun uniku.

381
00:17:21,150 --> 00:17:21,849
Mistoqsijiet kbar.

382
00:17:21,849 --> 00:17:25,339
Kwalunkwe mistoqsijiet oħra?

383
00:17:25,339 --> 00:17:26,220
OK, biża.

384
00:17:26,220 --> 00:17:30,680

385
00:17:30,680 --> 00:17:35,330
Għal darb'oħra, dan huwa kif dawn seletturi
huma referenzjati fil CSS, ma hashtag,

386
00:17:35,330 --> 00:17:40,031
ma dot, jew mingħajr xejn għall
tassenja l-istil ta 'xi lametta,

387
00:17:40,031 --> 00:17:40,530
bħal ġisem.

388
00:17:40,530 --> 00:17:43,500

389
00:17:43,500 --> 00:17:47,860
U hawn aħna għandna l-ġenerali
sintassi ta 'kif isir dan.

390
00:17:47,860 --> 00:17:52,830

391
00:17:52,830 --> 00:17:55,680
>> Jirrepetu xi aħjar
prattiki għall HTML u CSS,

392
00:17:55,680 --> 00:17:59,170
għandna bżonn li, għal darb'oħra, qrib kollha
l-tags HTML li aħna tiftaħ.

393
00:17:59,170 --> 00:18:03,950
U dak li aħna rakkomandat li inti
tagħmel għall-proġetti finali tiegħek,

394
00:18:03,950 --> 00:18:10,560
kif ukoll għall-CS50 Finanzi, huwa li tagħmel
żgur li kollha ta 'HTML tiegħek tivvalida.

395
00:18:10,560 --> 00:18:12,920
U li jsir bl-validator W3.

396
00:18:12,920 --> 00:18:16,940
>> U allura dak li għamilna u
dak nirrakkomandaw tagħmel

397
00:18:16,940 --> 00:18:19,790
huwa separazzjoni stil, so
CSS minn Markup HTML.

398
00:18:19,790 --> 00:18:24,210
Allura xi ħaġa li hija rigward kif
paġna tiegħek se viżwalment tfittex

399
00:18:24,210 --> 00:18:27,330
u kif li għaddej biex jiġu modifikati
għandhom imorru ġo dokument CSS.

400
00:18:27,330 --> 00:18:33,880
U mbagħad Markup tiegħek li tiddikjara kif l-affarijiet
huma f'relazzjoni ma 'xulxin hija HTML,

401
00:18:33,880 --> 00:18:37,550
u li għandha tmur ġewwa
ta 'dokumenti HTML tiegħek.

402
00:18:37,550 --> 00:18:38,590
Kwalunkwe mistoqsijiet?

403
00:18:38,590 --> 00:18:39,226
MHM.

404
00:18:39,226 --> 00:18:42,628
>> UDJENZA: X'inhi eżattament li qed jiġri
fuq il-validazzjoni paġna

405
00:18:42,628 --> 00:18:47,945
meta aħna qed validazzjoni tal-
HTML li [inaudible] ħolqot?

406
00:18:47,945 --> 00:18:49,850
>> MARIA ZLATKOVA: Allura what-- taħseb.

407
00:18:49,850 --> 00:18:53,020
Allura x'inhi eżattament li qed jiġri
fuq il-validazzjoni paġna

408
00:18:53,020 --> 00:18:55,570
u għaliex għandna bżonn li nagħmlu?

409
00:18:55,570 --> 00:18:59,180
Bażikament, għandna bżonn li tagħmel dan
peress li ħafna drabi, browser tiegħek,

410
00:18:59,180 --> 00:19:01,390
jekk inti ma tagħlaq tag
jew xi ħaġa bħal dik,

411
00:19:01,390 --> 00:19:05,680
browser tiegħek għadu għaddej biex
tirrendi paġna u xorta jista 'jaħdem,

412
00:19:05,680 --> 00:19:10,840
iżda huwa aħjar prattika li jiġi żgurat li
inti stajt, għal darb'oħra, magħluqa tikketti kollha tiegħek,

413
00:19:10,840 --> 00:19:13,190
li l-elementi kollha tiegħek huma
il-mod li dawn għandhom ikunu,

414
00:19:13,190 --> 00:19:18,470
u bażikament li huwa mill-
konvenzjonijiet li huma issettjati minn qabel.

415
00:19:18,470 --> 00:19:21,970
>> Huwa, għal darb'oħra, biss
ħaġa li għandek

416
00:19:21,970 --> 00:19:24,040
tkun tagħlim li tkun qiegħda tagħmel,
aktar milli jkollok

417
00:19:24,040 --> 00:19:25,696
kodiċi sloppier u għalf bħal dik.

418
00:19:25,696 --> 00:19:26,688
Yeah.

419
00:19:26,688 --> 00:19:27,680
Oh, sorry.

420
00:19:27,680 --> 00:19:29,221
Ħsibt li inti kienu qed iżidu naħa tiegħek.

421
00:19:29,221 --> 00:19:31,240
UDJENZA: Le, I kien biss [inaudible].

422
00:19:31,240 --> 00:19:33,800
>> MARIA ZLATKOVA: OK.

423
00:19:33,800 --> 00:19:34,640
>> UDJENZA: Grazzi.

424
00:19:34,640 --> 00:19:36,181
>> MARIA ZLATKOVA: Of course, grazie.

425
00:19:36,181 --> 00:19:41,680
Għalhekk għal darb'oħra, li tmur fuq lejn kif
informazzjoni tiġi trasferita

426
00:19:41,680 --> 00:19:44,630
u mudelli ta 'komunikazzjoni
li tittrasferixxi informazzjoni.

427
00:19:44,630 --> 00:19:45,730
TCP / IP.

428
00:19:45,730 --> 00:19:48,600
TCP ifisser biss Trażmissjoni
Protokoll kontroll u IP

429
00:19:48,600 --> 00:19:51,260
jirreferi għal Internet Protocol.

430
00:19:51,260 --> 00:19:54,275
U li biss jirreferi għal
il-mod id-data hija mogħtija.

431
00:19:54,275 --> 00:19:59,470

432
00:19:59,470 --> 00:20:02,710
>> Jekk ikollna xi data li
jeħtieġ li titwassal lil you-- hekk

433
00:20:02,710 --> 00:20:06,770
inti tagħmel talba għal server partikolari.

434
00:20:06,770 --> 00:20:09,800
Per eżempju, meta aħna
tipprova l-aċċess cs50.net,

435
00:20:09,800 --> 00:20:12,420
nagħmlu talba lill
l-server CS50 u aħna

436
00:20:12,420 --> 00:20:14,720
tara li aħna rridu nġibu
dan it-tip ta 'informazzjoni.

437
00:20:14,720 --> 00:20:19,294
U mbagħad huma bbażati fuq dan il-protokoll
għal kemm din l-informazzjoni ma tingħata,

438
00:20:19,294 --> 00:20:21,460
l-server jagħti informazzjoni
lura lilna, il-klijent.

439
00:20:21,460 --> 00:20:25,590
U allura aħna qed kapaċi biex tara
l-informazzjoni għall-paġna

440
00:20:25,590 --> 00:20:26,390
u mbagħad jużaw dan.

441
00:20:26,390 --> 00:20:29,300

442
00:20:29,300 --> 00:20:33,050
>> Mela allura Portugues Transfer Protocol
huwa biss protokoll jew sett ieħor

443
00:20:33,050 --> 00:20:37,470
ta 'konvenzjonijiet li tiddefinixxi kif
il-web browser u l-web server

444
00:20:37,470 --> 00:20:38,890
għandhom jikkomunikaw.

445
00:20:38,890 --> 00:20:43,730
U t-tqegħid dan kollu
flimkien, HTTP, għal darb'oħra,

446
00:20:43,730 --> 00:20:50,960
biss jiddefinixxi kif din Portugues definit
mill-HTML li aħna kont qed taħdem dan,

447
00:20:50,960 --> 00:20:59,500
kif għandu jingħata lilek u
kif dik id-data li hija mogħtija lilek

448
00:20:59,500 --> 00:21:00,540
gets lilek.

449
00:21:00,540 --> 00:21:05,990
>> U hu għalhekk li, jekk inti guys tiftakar
minn klassi, kellna ħafna ta 'talbiet

450
00:21:05,990 --> 00:21:08,970
u kellna ħafna ta 'sintassi
għal dawn it-talbiet li aħna qed

451
00:21:08,970 --> 00:21:10,250
se jmorru fuq id-dritt issa.

452
00:21:10,250 --> 00:21:13,270
Għalhekk għal darb'oħra, meta nibagħtu
talba għal server,

453
00:21:13,270 --> 00:21:15,920
irridu jiddefinixxu ftit affarijiet.

454
00:21:15,920 --> 00:21:18,520
Allura għandna bżonn issib it-tip
ta 'talba li aħna qed iffissar.

455
00:21:18,520 --> 00:21:22,180
U għal darb'oħra, aħna għandna, per eżempju,
IKOLLOK hija tip wieħed ta-metodu

456
00:21:22,180 --> 00:21:25,290
li għandna fit-talba tagħna.

457
00:21:25,290 --> 00:21:31,710
>> U mbagħad HTTP / 1.1 huwa biss l-
protokoll li aħna qed tuża bħalissa.

458
00:21:31,710 --> 00:21:34,224

459
00:21:34,224 --> 00:21:36,890
Ħafna mill-ħin, li għaddej
il-protokoll li aħna qed tuża.

460
00:21:36,890 --> 00:21:40,290
Mela jekk għandek xi mistoqsija
bħal dik fuq kwizz tiegħek.

461
00:21:40,290 --> 00:21:43,120
Dik hija l-konvenzjonijiet
li għandna s'issa.

462
00:21:43,120 --> 00:21:46,580
>> Backslash tirreferi għal dak it-tip
ta 'affarijiet aħna qed titlob.

463
00:21:46,580 --> 00:21:52,810
Imbagħad, ospitanti tagħna huwa, per eżempju, f'dan
każ, aħna qed jippruvaw biex tmur google.com.

464
00:21:52,810 --> 00:21:57,070
Allura dan huwa l-valur għal ospitanti.

465
00:21:57,070 --> 00:21:59,330
Dan huwa tip ta 'talba
li jistgħu jintbagħtu.

466
00:21:59,330 --> 00:22:02,890
>> U mbagħad tip ta 'rispons li jista
jintbagħtu, għal darb'oħra, ibbażata fuq dan il-protokoll,

467
00:22:02,890 --> 00:22:05,190
hija għal darb'oħra, HTTP / 1.1.

468
00:22:05,190 --> 00:22:07,150
Allura dak l-verżjoni HTTP mill-ġdid.

469
00:22:07,150 --> 00:22:09,730
200 OK huwa biss il-kodiċi istatus.

470
00:22:09,730 --> 00:22:12,860
U li OK huwa biss frażi
ibbażati fuq dak il-kodiċi istatus.

471
00:22:12,860 --> 00:22:15,520
>> U allura l-kontenut tat-Tip
jirreferi għat-tip

472
00:22:15,520 --> 00:22:20,295
li huwa rritornat lilek li hija
għal dik il-paġna web li inti tirċievi

473
00:22:20,295 --> 00:22:22,570
u li browser tiegħek
jista 'jirrendi wara.

474
00:22:22,570 --> 00:22:24,401
U li huwa test / html.

475
00:22:24,401 --> 00:22:26,660
>> UDJENZA: X'tagħmel 1.1 jfisser?

476
00:22:26,660 --> 00:22:29,910
>> MARIA ZLATKOVA: Dik hija biss il-
Verżjoni of-- oh, dak ma 1.1 jfisser?

477
00:22:29,910 --> 00:22:37,075
Dan huwa biss il-verżjoni, l-HTTP
Verżjoni ta 'protokoll li aħna qed tuża.

478
00:22:37,075 --> 00:22:37,700
Kwistjoni kbira.

479
00:22:37,700 --> 00:22:38,366
Mistoqsijiet oħra?

480
00:22:38,366 --> 00:22:41,222

481
00:22:41,222 --> 00:22:45,080
>> UDJENZA: Tista qosor
Kontenut-Tip reali malajr?

482
00:22:45,080 --> 00:22:48,150
>> MARIA ZLATKOVA: Allura li
huwa dak li l-server.

483
00:22:48,150 --> 00:22:51,020
it-tip ta 'information-- dak li hu
tip kontenut kien l-mistoqsijiet.

484
00:22:51,020 --> 00:22:53,400
Allura li kien it-tip ta '
informazzjoni li inti tikseb lura

485
00:22:53,400 --> 00:22:58,200
mis-server, it-tip ta '
data li l-browser jista 'mbagħad

486
00:22:58,200 --> 00:23:00,604
jirrendu li inti qed tuża.

487
00:23:00,604 --> 00:23:03,020
UDJENZA: Hija li dak li dan
protokoll huwa tghidlek li tagħmel?

488
00:23:03,020 --> 00:23:03,390
MARIA ZLATKOVA: Jiddispjacini?

489
00:23:03,390 --> 00:23:05,380
UDJENZA: Hija li dak il-protokoll jgħidu?

490
00:23:05,380 --> 00:23:05,915
MARIA ZLATKOVA: Il protocol--

491
00:23:05,915 --> 00:23:07,940
UDJENZA: --what il
Kontenut-Tip hija jew what--

492
00:23:07,940 --> 00:23:12,040
MARIA ZLATKOVA: Il-protokoll huwa bbażat
on-- dak huwa l-protokoll tghidlek?

493
00:23:12,040 --> 00:23:16,070
Dik hija biss il-mod
li din l-informazzjoni

494
00:23:16,070 --> 00:23:18,610
ġiet mogħtija lilek bbażat
fuq x'tip ta 'protokoll

495
00:23:18,610 --> 00:23:21,830
kien dan it-tagħrif ltqajna
mogħtija lura lilek.

496
00:23:21,830 --> 00:23:23,500
Does li jagħmel sens it-tip ta '?

497
00:23:23,500 --> 00:23:28,320

498
00:23:28,320 --> 00:23:30,070
HANNAH Blumberg: You
tista 'taħseb protokoll

499
00:23:30,070 --> 00:23:33,300
kif a-- I think Professur
Malan deskritt

500
00:23:33,300 --> 00:23:36,910
fil-klassi bħala tip simili a-- huwa simili
l-ekwivalenti ta 'handshaking bniedem.

501
00:23:36,910 --> 00:23:44,930
Say, bħal, ħej, jien talba u I
taf kif jitqandlu HTTP tal-verżjoni 1.1.

502
00:23:44,930 --> 00:23:48,770
U allura l-server jgħid,
oh, OK, I-- u tnejn jeżistu.

503
00:23:48,770 --> 00:23:51,337
Naf kif se jagħmlu bi HTTP / 1.1.

504
00:23:51,337 --> 00:23:53,170
U jien ser jagħti
inti lura xi kontenut.

505
00:23:53,170 --> 00:23:56,230
F'dan il-każ, li għaddej
li jkunu ta 'test tip / html.

506
00:23:56,230 --> 00:23:58,480
Allura huwa tip ta biss mod
minnhom għall communicating--

507
00:23:58,480 --> 00:24:00,480
>> MARIA ZLATKOVA: Huwa biss
tikkonferma li int

508
00:24:00,480 --> 00:24:03,290
kemm wara l-istess
protokoll u li kemm

509
00:24:03,290 --> 00:24:06,620
il-klijent u l-server-- hekk
browser tiegħek u l server--

510
00:24:06,620 --> 00:24:09,280
tip ta 'know dak li qed
jitkellem dwar u jkollhom

511
00:24:09,280 --> 00:24:12,557
il-konvenzjoni għal mogħdija fid-data.

512
00:24:12,557 --> 00:24:17,022
>> UDJENZA: Allura l-part-- Kontenut-Tip
it-test Kontenut-Tip / html-- li l-

513
00:24:17,022 --> 00:24:18,521
parti separata tal-istess messaġġ?

514
00:24:18,521 --> 00:24:20,509
Jew hija parti mill ejja ngħidu, 200?

515
00:24:20,509 --> 00:24:22,010
Ma 200 jgħidulhom dak jew is--

516
00:24:22,010 --> 00:24:23,770
>> MARIA ZLATKOVA: 200 jgħid li kollha marru OK.

517
00:24:23,770 --> 00:24:27,900
U mbagħad tip kontenut huwa tip ta '
parti separata tal-istess messaġġ,

518
00:24:27,900 --> 00:24:34,274
u qalu li l-ħaġa li I
ritornati għandha dan it-tip ta 'test / html.

519
00:24:34,274 --> 00:24:35,690
Huwa sempliċiment tagħti aktar informazzjoni.

520
00:24:35,690 --> 00:24:38,700

521
00:24:38,700 --> 00:24:39,995
Jkollhom xejn li jżid?

522
00:24:39,995 --> 00:24:40,495
KOLLOX SEW.

523
00:24:40,495 --> 00:24:43,590

524
00:24:43,590 --> 00:24:46,530
>> Kwalunkwe mistoqsijiet oħra dwar dan?

525
00:24:46,530 --> 00:24:48,370
Tal-biża.

526
00:24:48,370 --> 00:24:54,070
Allura xi istatus HTTP oħra li
nistgħu jiksbu flimkien ma '200 OK,

527
00:24:54,070 --> 00:24:59,500
dawk li Rajna forsi
possibilment ħafna huma 403 u 404.

528
00:24:59,500 --> 00:25:05,190
Allura 404, jekk inti kienu qegħdin jippruvaw
xi ħaġa li ma teżistix aċċess.

529
00:25:05,190 --> 00:25:10,460
Hekk per eżempju, fil tiegħek
Psets CS50 Finanzi,

530
00:25:10,460 --> 00:25:15,640
jekk inti kienu tirrendi quote.html
u inti ma kellhiex dan il-fajl,

531
00:25:15,640 --> 00:25:19,740
imma minflok kellek quote.php, li
twassal għal 404 Not Found

532
00:25:19,740 --> 00:25:21,600
minħabba li l-fajl ma tista 'teżisti.

533
00:25:21,600 --> 00:25:25,690
>> Għal 403 projbit, li
tirreferi għall-permessi.

534
00:25:25,690 --> 00:25:31,150
Mela jekk xi fajl mhuwiex tinqara mill-
dinja, inti tista 'tikseb l-403 lura.

535
00:25:31,150 --> 00:25:34,510

536
00:25:34,510 --> 00:25:37,810
Xi oħrajn li inti tista '
get-- 301, Ittrasferit permanenti;

537
00:25:37,810 --> 00:25:41,300
302, Found; 304, Modifikat;
400, Bad Talba;

538
00:25:41,300 --> 00:25:47,330
u mbagħad Intern Error Server għall
500 u 503, Service mhux disponibbli.

539
00:25:47,330 --> 00:25:48,140
Iva.

540
00:25:48,140 --> 00:25:51,490
>> UDJENZA: Se aħna mistennija li
jimmemorizza dawk status kollha?

541
00:25:51,490 --> 00:25:53,739
MARIA ZLATKOVA: I jkollhom
minnhom fuq folja iqarrqu tiegħek.

542
00:25:53,739 --> 00:25:55,146
[Rires]

543
00:25:55,146 --> 00:25:59,954
UDJENZA: Are we mistennija li
jafu dak li jqajjem kull wieħed?

544
00:25:59,954 --> 00:26:00,995
MARIA ZLATKOVA: Dawn huma?

545
00:26:00,995 --> 00:26:03,870
HANNAH Blumberg: Għal dawk li konna
run into-- sabiex il-kwistjoni was--

546
00:26:03,870 --> 00:26:08,010
MARIA ZLATKOVA: Dawn huma mistennija li
jafu liema kull waħda minn dawn status

547
00:26:08,010 --> 00:26:09,330
kodiċijiet jista 'jiġi kkawżat minn?

548
00:26:09,330 --> 00:26:13,240
Allura għal dawk li konna użati
u dam fis, nixtieq ngħid, iva.

549
00:26:13,240 --> 00:26:16,610
Allura konna definittivament dehru 200
OK u llekċerja fil psets.

550
00:26:16,610 --> 00:26:19,071
Rajna 403, 404.

551
00:26:19,071 --> 00:26:20,550
Għal dawk l-oħra?

552
00:26:20,550 --> 00:26:22,690
>> HANNAH Blumberg: nixtieq
jgħidu 500 jidher ġusti logħba.

553
00:26:22,690 --> 00:26:23,330
>> MARIA ZLATKOVA: 500, yeah.

554
00:26:23,330 --> 00:26:24,246
>> HANNAH Blumberg: Yeah.

555
00:26:24,246 --> 00:26:27,006
Just jkollhom sens ġenerali
ta 'dak li ġġiegħlhom.

556
00:26:27,006 --> 00:26:28,880
U wkoll biss minn dawn l
ismijiet, inti tista tip ta '

557
00:26:28,880 --> 00:26:32,890
bħal tagħmel raden edukati bħala
għal dak li effettivament ikkawżat minnhom.

558
00:26:32,890 --> 00:26:36,919
Per eżempju, jimxu permanentement, probabbilment
il-fajl kien imċaqlaq b'mod permanenti.

559
00:26:36,919 --> 00:26:39,328
>> UDJENZA: Iżda fuq preċedenti
eżami, kien hemm tant

560
00:26:39,328 --> 00:26:41,050
kif taħseb li tistenna li tingħata risposta għal din?

561
00:26:41,050 --> 00:26:42,883
>> HANNAH Blumberg: Li
kien jiswa żero punti.

562
00:26:42,883 --> 00:26:45,870
Il-mistoqsija fuq 418 fuq il-teapot
huwa teknikament status HTTP,

563
00:26:45,870 --> 00:26:47,090
iżda kien jiswa żero punti.

564
00:26:47,090 --> 00:26:48,320
Ovvjament, int mhux
mistenni jafu lilhom.

565
00:26:48,320 --> 00:26:49,670
>> UDJENZA: Iżda hija waħda reali?

566
00:26:49,670 --> 00:26:51,970
>> HANNAH Blumberg: Huwa veru
wieħed, iżda dan ma jfissirx xejn.

567
00:26:51,970 --> 00:26:52,700
Huwa biss ċajta.

568
00:26:52,700 --> 00:26:55,480

569
00:26:55,480 --> 00:26:57,010
Nies internet huma umoristiċi.

570
00:26:57,010 --> 00:26:59,680
>> MARIA ZLATKOVA: mistoqsijiet Kbar, guys.

571
00:26:59,680 --> 00:27:01,452
Kwalunkwe mistoqsijiet oħra?

572
00:27:01,452 --> 00:27:04,891
>> UDJENZA: X'inhu żball server interna?

573
00:27:04,891 --> 00:27:06,640
MARIA ZLATKOVA: Intern
żball server biss

574
00:27:06,640 --> 00:27:10,050
ifisser li ġejt
ma jkunux jistgħu jikkomunikaw

575
00:27:10,050 --> 00:27:13,400
mal-server għal xi raġuni.

576
00:27:13,400 --> 00:27:15,400
Għalhekk mhuwiex neċessarjament
xi ħaġa li għandha x'taqsam

577
00:27:15,400 --> 00:27:19,170
mal-klijent jew xi ħaġa bħal dik.

578
00:27:19,170 --> 00:27:22,170
I do not know ta 'xi eżempju speċifiku
li konna marret fuq biex jispjegaw,

579
00:27:22,170 --> 00:27:23,000
iżda yeah.

580
00:27:23,000 --> 00:27:23,250
>> HANNAH Blumberg: Sure.

581
00:27:23,250 --> 00:27:25,625
Hekk per eżempju, bħall ejja
ngħidu li inti kienu qed jaħdmu fuq mashup

582
00:27:25,625 --> 00:27:30,440
u server Google niżlet għal xi
raġuni, outage enerġija, ejja ngħidu.

583
00:27:30,440 --> 00:27:33,400
Dan ikun ta 'server intern
żball jew xi tip of-- bħalek

584
00:27:33,400 --> 00:27:34,630
mhux se tikseb rispons lura.

585
00:27:34,630 --> 00:27:35,260
>> MARIA ZLATKOVA: Yeah.

586
00:27:35,260 --> 00:27:37,050
Huwa biss meta int
ma jkunux jistgħu jikkomunikaw

587
00:27:37,050 --> 00:27:40,299
mal-server għal xi raġuni għaliex
ta 'dan jinżel' l isfel jew xi raġuni oħra.

588
00:27:40,299 --> 00:27:44,430

589
00:27:44,430 --> 00:27:47,690
Allura jaqbeż fis PHP.

590
00:27:47,690 --> 00:27:49,930
PHP, b'differenza HTML, huwa
lingwa ta 'programmar.

591
00:27:49,930 --> 00:27:54,820
U aħna bdew jużaw dan għaliex dan huwa
utli ħafna għall-iżvilupp tal-web.

592
00:27:54,820 --> 00:27:56,940
>> We ewwel użata fil CS50 Finanzi.

593
00:27:56,940 --> 00:28:02,240
U bażikament jgħinna iġibu
flimkien dan markup, id-disinn,

594
00:28:02,240 --> 00:28:07,460
u kif aħna attwalment jużaw l-informazzjoni
li juru l-affarijiet fuq paġna web.

595
00:28:07,460 --> 00:28:11,870
Allura PHP innifsu jfisser PHP
Portugues Preprocessor,

596
00:28:11,870 --> 00:28:15,360
għalhekk huwa backnorym rikursivi minnu stess.

597
00:28:15,360 --> 00:28:22,330
U l-ftuħ tags għall PHP aħna ix-xellug
u l-vleġeġ lemin bl-trade marks in kwistjoni

598
00:28:22,330 --> 00:28:23,060
u PHP.

599
00:28:23,060 --> 00:28:25,890
>> Allura aħna stajt diġà raw mazz ta 'dan.

600
00:28:25,890 --> 00:28:29,150
Issa, aħna qed biss se jmorru fuq
xi wħud mill-affarijiet bażiċi dwar dan.

601
00:28:29,150 --> 00:28:32,280
Allura ma PHP, il-varjabbli
ismijiet tibda bil sinjal dollaru.

602
00:28:32,280 --> 00:28:35,660
Aħna ma jispeċifikaw, għal darb'oħra,
varjabbli tip aktar.

603
00:28:35,660 --> 00:28:38,450
Eżatt bħal għamilna ma C,
ma kellniex bżonn biex tagħmel dan.

604
00:28:38,450 --> 00:28:41,670

605
00:28:41,670 --> 00:28:44,490
>> Nistgħu nagħmlu mazz ta differenti
Jittieħed ma 'varjabbli.

606
00:28:44,490 --> 00:28:47,750
Aħna tista 'tpoġġihom flimkien
billi concatenating minnhom

607
00:28:47,750 --> 00:28:52,900
mal-dot notazzjoni, li
aħna ma setgħux jagħmlu fis-C-ġdid.

608
00:28:52,900 --> 00:28:57,490
Għal darb'oħra, aħna għandna versatilità daqsxejn aktar
ma PHP f'termini ta 'varjabbli.

609
00:28:57,490 --> 00:29:00,080
Għal darb'oħra, aħna ma jkollhom funzjoni prinċipali.

610
00:29:00,080 --> 00:29:03,370
>> U PHP huwa interpretat
għall-kuntrarju kkompilata,

611
00:29:03,370 --> 00:29:09,970
Allura kemm aħna ma tagħmel għall-fajls C,
aħna ma jkollhomx biex tagħmel dan PHP.

612
00:29:09,970 --> 00:29:15,440
Iżda, il-mod li l-lingwa
huwa mmexxi minnu stess, huwa interpretat.

613
00:29:15,440 --> 00:29:18,550
U mbagħad laxk ittajpjat
ifisser biss li aħna

614
00:29:18,550 --> 00:29:22,490
m'għandhomx għalfejn jispeċifika varjabbli
tip u t-tipi varjabbli

615
00:29:22,490 --> 00:29:25,415
huma mifhuma fil runtime.

616
00:29:25,415 --> 00:29:29,185
>> UDJENZA: Imma What did you
jfisser minn dot konkatenazzjoni?

617
00:29:29,185 --> 00:29:30,060
MARIA ZLATKOVA: Sure.

618
00:29:30,060 --> 00:29:37,660
Meta rridu biex l-affarijiet together--
hekk jekk kellna xi varjabbli li

619
00:29:37,660 --> 00:29:41,500
kellhom il-valur tat-3 u kellna ieħor
varjabbli li kellha l-valur ta 'spag,

620
00:29:41,500 --> 00:29:45,920
nistgħu tpoġġi l-varjabbli flimkien
billi jpoġġi dot bejniethom

621
00:29:45,920 --> 00:29:46,970
u concatenating minnhom.

622
00:29:46,970 --> 00:29:52,670
Jew nistgħu joħolqu
imsejħa isem varjabbli

623
00:29:52,670 --> 00:29:56,900
u poġġih flimkien mill
concatenating żewġ kordi.

624
00:29:56,900 --> 00:30:00,680
>> Mela jekk kellna string fi studji double
kwotazzjonijiet u npoġġux dot wara dan,

625
00:30:00,680 --> 00:30:03,660
u mbagħad kellna string ieħor, li
toħloq string għal kollox.

626
00:30:03,660 --> 00:30:05,242
>> UDJENZA: OK.

627
00:30:05,242 --> 00:30:06,450
MARIA LATVJA: Was li ċari?

628
00:30:06,450 --> 00:30:07,099
UDJENZA: Yeah.

629
00:30:07,099 --> 00:30:07,890
MARIA ZLATKOVA: OK.

630
00:30:07,890 --> 00:30:08,766
Iva.

631
00:30:08,766 --> 00:30:11,146
>> UDJENZA: Meta inti tgħidli
interpretat minflok kkompilata,

632
00:30:11,146 --> 00:30:14,160
huma inti titkellem dwarek ma
jeħtieġ li tkun speċifika meta

633
00:30:14,160 --> 00:30:15,906
niġu għall PHP versus C?

634
00:30:15,906 --> 00:30:18,085

635
00:30:18,085 --> 00:30:20,710
MARIA ZLATKOVA: Meta ngħidu
interpretata bħala kuntrarju kkompilata,

636
00:30:20,710 --> 00:30:21,850
X'nifhmu?

637
00:30:21,850 --> 00:30:26,220
Allura dan ifisser li aħna ma bżonn
fajls eżekutibbli jiddekorri PHP.

638
00:30:26,220 --> 00:30:29,870
Dan ifisser li din tmur kif tmur.

639
00:30:29,870 --> 00:30:31,650
Does li jagħmel sens?

640
00:30:31,650 --> 00:30:32,495
A ftit aktar.

641
00:30:32,495 --> 00:30:34,620
HANNAH Blumberg: Allura inti
tista 'taħseb ta' interpretu

642
00:30:34,620 --> 00:30:38,980
kif programm ieħor li huwa responsabbli
biex imur linja b'linja permezz PHP

643
00:30:38,980 --> 00:30:42,745
u fil-fatt eżekuzzjoni, għall-kuntrarju
li jikkompilawh kollha sa binarja.

644
00:30:42,745 --> 00:30:46,050
Din attwalment ma jfisser xejn
dwar kif speċifika jeħtieġ li nkunu.

645
00:30:46,050 --> 00:30:49,470
Aħna xorta jeħtieġu li jkunu preċiżi, u ma
tinsa virgola tiegħek, u kun żgur

646
00:30:49,470 --> 00:30:51,470
għandek sinjal dollaru tiegħek,
u affarijiet bħal dik.

647
00:30:51,470 --> 00:30:52,240
Tajba kwistjoni.

648
00:30:52,240 --> 00:30:53,115
>> MARIA ZLATKOVA: Yeah.

649
00:30:53,115 --> 00:30:55,590
Allura linja b'linja, kif
kuntrarju ma 'fajls C,

650
00:30:55,590 --> 00:30:59,100
irridu nkunu l-finali kollha
qabel nistgħu ngħidu run.

651
00:30:59,100 --> 00:31:00,360
Dik hija d-differenza prinċipali.

652
00:31:00,360 --> 00:31:02,655
Iżda għal darb'oħra, ma nistgħux
verament tkun inqas speċifiku.

653
00:31:02,655 --> 00:31:08,760

654
00:31:08,760 --> 00:31:13,950
Allura arrays fil PHP jirrappreżentaw
attwalment mappa ordnat.

655
00:31:13,950 --> 00:31:17,550
>> Allura valuri arrays assoċjati għal ċwievet.

656
00:31:17,550 --> 00:31:23,350
Iż-żewġ modi biex jiddikjaraw
firxa, ibbażata fuq dan sintassi,

657
00:31:23,350 --> 00:31:26,380
nistgħu nkunu aktar espliċita
jgħidu għandna firxa

658
00:31:26,380 --> 00:31:31,010
u għandna dan key1 li mapep li
dan value1, key2 li mapep value2.

659
00:31:31,010 --> 00:31:34,660
Jew nistgħu biss joħolqu firxa
li fiha l-valuri stess

660
00:31:34,660 --> 00:31:38,360
u allura l-ċwievet huma
mifhum b'mod.

661
00:31:38,360 --> 00:31:40,000
Kwalunkwe mistoqsijiet dwar dan?

662
00:31:40,000 --> 00:31:42,500
>> Udjenza: Liema t-tasti
jkun fit-tieni eżempju?

663
00:31:42,500 --> 00:31:47,100

664
00:31:47,100 --> 00:31:47,920
0, 1, 2, 3?

665
00:31:47,920 --> 00:31:50,650

666
00:31:50,650 --> 00:31:55,780
>> MARIA ZLATKOVA: Per eżempju, huwa biss
l-imfietaħ f'dan do mhux neċessarjament

667
00:31:55,780 --> 00:31:56,550
tagħmel differenza.

668
00:31:56,550 --> 00:32:01,720
Huma biss jiddefinixxu kif tista '
juża l-valuri ġewwa ta 'dan.

669
00:32:01,720 --> 00:32:08,660
Mela jekk kellna foreach
loop fil-PHP li kieku

670
00:32:08,660 --> 00:32:14,760
inessu jgħaddu mill-valuri kollha,
nistgħu jgħaddu l-valuri kollha,

671
00:32:14,760 --> 00:32:19,570
anke jekk kellna jew ma ddefinietx
ċavetta speċifika fis-sit tal

672
00:32:19,570 --> 00:32:20,820
sintassi preċedenti.

673
00:32:20,820 --> 00:32:23,460
>> Allura anke ma 'dan it-tip
ta array, nistgħu xorta

674
00:32:23,460 --> 00:32:26,260
jkollhom loop foreach
li tmur permezz ta 'kull

675
00:32:26,260 --> 00:32:31,240
tal-valuri fl-iskema fil-firxa.

676
00:32:31,240 --> 00:32:36,180
Allura l-sintassi ta 'foreach
loop, nibdew ma 'firxa.

677
00:32:36,180 --> 00:32:38,720

678
00:32:38,720 --> 00:32:43,900
Din il-varjabbli $ arr huwa array attwali tagħna
li aħna definit fil-slide ta 'qabel

679
00:32:43,900 --> 00:32:47,550
bħala l-valur li litteralment tmur
permezz ta 'kull tal-valuri,

680
00:32:47,550 --> 00:32:50,122
irrispettivament minn jekk
kellna kjavi jew le.

681
00:32:50,122 --> 00:32:53,080
U allura nistgħu nagħmlu xi ħaġa ma '
il-valur ġewwa tal-linja foreach.

682
00:32:53,080 --> 00:32:57,730
Għalhekk għal darb'oħra, jekk kellna firxa
bħal dan hawn created--

683
00:32:57,730 --> 00:33:03,270
hekk aħna ċ-ċavetta tas foo u l-valur tal
bar, il-muftieħ tal baz u l-valur tal qux--

684
00:33:03,270 --> 00:33:09,730
jista 'jkollna loop foreach li
tmur permezz array bħala valur ewlieni

685
00:33:09,730 --> 00:33:11,900
u mbagħad tagħmel xi ħaġa
il-formula u / jew il-valur.

686
00:33:11,900 --> 00:33:15,980
Iżda aħna ma neċessarjament dejjem
għandhom ikollhom foreach linji li

687
00:33:15,980 --> 00:33:19,410
tmur permezz array kif mappa muftieħ għall-valur.

688
00:33:19,410 --> 00:33:26,060
Aħna tista 'tmur permezz tal-
array loop foreach bħala valur.

689
00:33:26,060 --> 00:33:28,990
>> HANNAH Blumberg: U naħseb
kien to-- mistoqsija tiegħek, liema

690
00:33:28,990 --> 00:33:31,229
huwa l-indiċi impliċitu?

691
00:33:31,229 --> 00:33:31,895
UDJENZA: Kinda.

692
00:33:31,895 --> 00:33:32,240
MARIA ZLATKOVA: Oh.

693
00:33:32,240 --> 00:33:33,406
HANNAH Blumberg: Yeah, yeah.

694
00:33:33,406 --> 00:33:36,150
Allura bażikament, jekk inti ma jispeċifikawx
ewlieni, li għaddej biex tkun 01.

695
00:33:36,150 --> 00:33:37,140
>> MARIA ZLATKOVA: Yeah.

696
00:33:37,140 --> 00:33:41,718
Eżatt bħal ma C, huwa żero
indiċjati jekk inti ma jispeċifikawx ċavetta.

697
00:33:41,718 --> 00:33:42,384
UDJENZA: Jiddispjacini.

698
00:33:42,384 --> 00:33:43,827
Tista 'tipprova titkellem
ftit louder?

699
00:33:43,827 --> 00:33:45,270
Jien li ftit ta '
inkwiet kollox smigħ.

700
00:33:45,270 --> 00:33:46,478
>> MARIA ZLATKOVA: jien so sorry.

701
00:33:46,478 --> 00:33:48,439
Yeah, tal-kors.

702
00:33:48,439 --> 00:33:50,230
Allura inti tixtieq li lili
li jmorru fuq dan jerġa?

703
00:33:50,230 --> 00:33:51,680
Jew hija this--

704
00:33:51,680 --> 00:33:54,930
UDJENZA: Allura fuq il-slide-- preċedenti jekk
inti tista 'biss tmur lura għat-tieni waħda.

705
00:33:54,930 --> 00:33:57,313
MARIA ZLATKOVA: Of course, sorry.

706
00:33:57,313 --> 00:33:59,237
UDJENZA: Allura t-tieni
firxa hawn ma

707
00:33:59,237 --> 00:34:04,135
jidhru li jkollhom valur li ewlieni,
Speċita [? kawżalità. ?]

708
00:34:04,135 --> 00:34:05,343
MARIA ZLATKOVA: Dritt, id-dritt.

709
00:34:05,343 --> 00:34:07,608
UDJENZA: Allura kif ma dak ix-xogħol
meta inti tgħidli dan kollu jew xejn.

710
00:34:07,608 --> 00:34:08,969
Lili, li qisu
a [? foo?] diġà.

711
00:34:08,969 --> 00:34:10,093
>> MARIA ZLATKOVA: Yeah, yeah.

712
00:34:10,093 --> 00:34:12,969
Għalhekk għal darb'oħra, dan huwa
Mappa ordnat f'dan is-sens

713
00:34:12,969 --> 00:34:15,639
li hemm huma mifhuma,
per eżempju, l-indiċi

714
00:34:15,639 --> 00:34:20,159
hawn tista 'tinftiehem bħala 0, 1, 2, 3.

715
00:34:20,159 --> 00:34:25,929
Għal darb'oħra, dan huwa li dawk
indiċi huwa ekwivalenti tagħna

716
00:34:25,929 --> 00:34:28,980
ta 'wara ċwievet mapping fuq valuri.

717
00:34:28,980 --> 00:34:34,710
Mela jekk ċavetta tagħna kien 0-- sorry.

718
00:34:34,710 --> 00:34:36,524
>> HANNAH Blumberg: Le,
theres ġibs up here.

719
00:34:36,524 --> 00:34:36,929
Huwa fil-fatt tassew sbieħ.

720
00:34:36,929 --> 00:34:37,460
>> MARIA ZLATKOVA: Li l-kbir.

721
00:34:37,460 --> 00:34:38,260
KOLLOX SEW.

722
00:34:38,260 --> 00:34:49,489
Għalhekk għal darb'oħra, $ arr 0 jkun
l-muftieħ għall-valur 1.

723
00:34:49,489 --> 00:34:51,138
0 kien jkun iċ-ċavetta għall-valur 1.

724
00:34:51,138 --> 00:34:51,971
UDJENZA: Jien sorry.

725
00:34:51,971 --> 00:34:53,190
Huwa inviżibbli.

726
00:34:53,190 --> 00:34:53,659
>> HANNAH Blumberg: Id-dritt, nevermind.

727
00:34:53,659 --> 00:34:54,980
Ġibs kienet idea ħażina.

728
00:34:54,980 --> 00:34:58,030
I teħodha lura.

729
00:34:58,030 --> 00:35:01,425
Inti tista 'taħseb l-keys
kif 0 mapep għall-valur 1.

730
00:35:01,425 --> 00:35:02,300
MARIA ZLATKOVA: Yeah.

731
00:35:02,300 --> 00:35:04,630
Allura dan huwa ta '0, dan huwa 1, 2, 3.

732
00:35:04,630 --> 00:35:05,760
Dawn jistgħu jkunu ċwievet tiegħek.

733
00:35:05,760 --> 00:35:10,020
Inti tista 'taħseb minnhom as-- yeah.

734
00:35:10,020 --> 00:35:12,740
Allura minflok li
ċwievet espliċiti, dawn qed

735
00:35:12,740 --> 00:35:17,180
tip ta 'tinftiehem bħala li
l-indiċi li jibdew minn 0.

736
00:35:17,180 --> 00:35:21,630

737
00:35:21,630 --> 00:35:24,820
Il ġibs ma jgħinu.

738
00:35:24,820 --> 00:35:25,722
Yeah.

739
00:35:25,722 --> 00:35:30,914
>> UDJENZA: Għall-loop foreach,
jekk ridna biex tara l-valur kif,

740
00:35:30,914 --> 00:35:33,245
dan iwassal biss awtomatikament indiċi għal 0?

741
00:35:33,245 --> 00:35:34,120
MARIA ZLATKOVA: Yeah.

742
00:35:34,120 --> 00:35:35,745
Ikun jgħaddu kull wieħed mill-valuri.

743
00:35:35,745 --> 00:35:39,130
UDJENZA: [inaudible] kif
0 jew ikun li sempliċiment tagħmel 0?

744
00:35:39,130 --> 00:35:43,710
>> MARIA ZLATKOVA: Int tkun
ngħid bħala sinjal dollaru u mbagħad

745
00:35:43,710 --> 00:35:46,266
xi isem varjabbli, il-valur.

746
00:35:46,266 --> 00:35:47,182
UDJENZA: [inaudible].

747
00:35:47,182 --> 00:35:50,048

748
00:35:50,048 --> 00:35:50,964
MARIA ZLATKOVA: Jiddispjacini?

749
00:35:50,964 --> 00:35:52,839
UDJENZA: Jiddispjacini, jien
biss tipprova tiftakar.

750
00:35:52,839 --> 00:35:57,190
Kif inti tagħmel dan jekk inti tista 'tagħmel dan
awtomatikament indiċjar huwa biss 0 tar?

751
00:35:57,190 --> 00:36:00,780
>> MARIA ZLATKOVA: Allura kif tista 'tagħmel dan
jekk inti ma kellhiex ismijiet speċifiċi ewlenin?

752
00:36:00,780 --> 00:36:01,710
>> UDJENZA: Yeah.

753
00:36:01,710 --> 00:36:07,820
>> MARIA ZLATKOVA: inti biss define--
biss jgħidu lilek innifsek bħala xi isem.

754
00:36:07,820 --> 00:36:17,950
Allura fil psets tiegħek, inti guys tista
ftakar $ ringiela foreach bħala $ ringieli,

755
00:36:17,950 --> 00:36:24,610
ħloqna ourself dan $ ringiela qal
irridu li jmorru permezz ringiela kif $ ringieli.

756
00:36:24,610 --> 00:36:28,360
Anki jekk aħna ma kellhiex
dan $ espliċita ringieli definiti,

757
00:36:28,360 --> 00:36:31,990
nistgħu biss tmur u
jgħidu dan jista 'jkun importanti tagħna,

758
00:36:31,990 --> 00:36:33,615
u biss jgħaddu kull wieħed mill-valuri.

759
00:36:33,615 --> 00:36:37,295

760
00:36:37,295 --> 00:36:41,660
>> UDJENZA: Allura huwa valur varjabbli ġdida
aħna qed joħolqu taħżen [inaudible]?

761
00:36:41,660 --> 00:36:46,820

762
00:36:46,820 --> 00:36:49,990
>> MARIA ZLATKOVA: Għalhekk mhuwiex
intrinsikament varjabbli ġdida.

763
00:36:49,990 --> 00:37:00,310
Huwa varjabbli li tirreferi għall-
ġewwa tal-firxa għal kull wieħed minnhom.

764
00:37:00,310 --> 00:37:02,060
HANNAH Blumberg: Huwa
isem varjabbli ġdida.

765
00:37:02,060 --> 00:37:04,018
MARIA ZLATKOVA: Yeah,
huwa isem varjabbli ġdida,

766
00:37:04,018 --> 00:37:06,680
iżda mhux inherently-- yeah.

767
00:37:06,680 --> 00:37:08,950
Huwa biss varjabbli ġdida
li inti tista 'tagħmel dan.

768
00:37:08,950 --> 00:37:12,680
Allura kemm ma għamilna
$ ringiela kif $ ringieli, ringieli

769
00:37:12,680 --> 00:37:17,980
kien isem varjabbli ġdid li aħna
tista 'toħloq fil-loop foreach tagħna.

770
00:37:17,980 --> 00:37:22,065
Huwa ma jkollu li preexist qabel dik.

771
00:37:22,065 --> 00:37:25,777
>> UDJENZA: Tista tmur permezz tal-
loġika għal kull, bl-użu l-eżempju hemmhekk?

772
00:37:25,777 --> 00:37:26,610
MARIA ZLATKOVA: MHM.

773
00:37:26,610 --> 00:37:31,240

774
00:37:31,240 --> 00:37:32,080
Oh, sorry.

775
00:37:32,080 --> 00:37:33,780
Hawn l-eżempju.

776
00:37:33,780 --> 00:37:34,280
Sure.

777
00:37:34,280 --> 00:37:38,950
Allura għal kull array-- hekk
dan ifisser jmorru għal din array

778
00:37:38,950 --> 00:37:43,930
kif ċavetta value-- li għaddej
li jmorru permezz ta 'dan array

779
00:37:43,930 --> 00:37:49,480
u l-ewwel mur u jiksbu foo, il
foo ewlenin u l-bar-valur.

780
00:37:49,480 --> 00:37:51,570
U mbagħad fit-tieni
iterazzjoni tal-linja għall-,

781
00:37:51,570 --> 00:37:55,090
li għaddej biex jgħaddu u jieħdu
l Baz ewlenin u l QUX valur.

782
00:37:55,090 --> 00:38:00,512
U allura inti tista 'tagħmel xi ħaġa ma'
waħda minnhom jew it-tnejn minnhom.

783
00:38:00,512 --> 00:38:03,488
>> UDJENZA: Allura l-idea wara
li jkollhom punt ewlieni għall-valur,

784
00:38:03,488 --> 00:38:07,470
liema do inti tispiċċa aċċess?

785
00:38:07,470 --> 00:38:10,680
>> MARIA ZLATKOVA: X'inhu l-idea
li jkun hemm tipponta ewlieni għall-valur?

786
00:38:10,680 --> 00:38:16,400
Huwa biss konvenzjoni ieħor, ieħor
mod ta 'għaddej permezz tal-firxa

787
00:38:16,400 --> 00:38:22,600
u li jkun hemm aċċess jew l-
ċavetta jew il-valur jew it-tnejn u jużawhom.

788
00:38:22,600 --> 00:38:27,100
>> UDJENZA: X'inhu l-irwol għall-
tordna li l-foreach tmur fil-?

789
00:38:27,100 --> 00:38:29,250
Hekk jekk konna biex iżżid
Elementi għall-firxa aktar tard,

790
00:38:29,250 --> 00:38:32,140
ikun dawk tkun l-ewwel dawk
imsejjaħ fil-firxa foreach,

791
00:38:32,140 --> 00:38:33,750
jew ma jkun tard fuq?

792
00:38:33,750 --> 00:38:37,770
>> MARIA ZLATKOVA: Allura x'inhi l
l-ordni li l-foreach

793
00:38:37,770 --> 00:38:39,210
loop tmur permezz ta 'firxa fil-?

794
00:38:39,210 --> 00:38:42,220
Hija tmur permezz tal-ewwel
element għall-aħħar element,

795
00:38:42,220 --> 00:38:43,400
l-aħħar element miżjud.

796
00:38:43,400 --> 00:38:48,020
Jekk inti żid elementi aktar tard, kieku
jiġu accessed-- l-ewwel elementi se

797
00:38:48,020 --> 00:38:51,410
jiġu aċċessati bħala l-ewwel
elementi tal-firxa,

798
00:38:51,410 --> 00:38:57,620
u mbagħad youd tmur minn kull waħda
l-elementi bħala tip ta 'ordered--

799
00:38:57,620 --> 00:39:02,930
mhux ordnat, iżda l-mod li
ma tkun imqiegħda fil-firxa.

800
00:39:02,930 --> 00:39:06,855
>> UDJENZA: Elementi So ġodda
huma miżjuda aktar tard?

801
00:39:06,855 --> 00:39:10,680
Allura dawn qed added-- dawn ser ikunu l-
dawk aħħar fil-[? iterazzjoni. ?]

802
00:39:10,680 --> 00:39:14,280
>> MARIA ZLATKOVA: Elementi ġodda can--
bażikament, meta elementi ġodda huma miżjuda,

803
00:39:14,280 --> 00:39:16,520
dawn huma miżjuda fl-aħħar tal-firxa?

804
00:39:16,520 --> 00:39:17,632
>> UDJENZA: Yeah.

805
00:39:17,632 --> 00:39:18,840
MARIA ZLATKOVA: Nemmen hekk.

806
00:39:18,840 --> 00:39:20,850
Iva.

807
00:39:20,850 --> 00:39:24,330
U mbagħad mal loop foreach tiegħek,
wara li tkun ħadthom miżjud elementi ġodda

808
00:39:24,330 --> 00:39:26,790
u inti tmur permezz tagħhom,
l-elementi ġodda se

809
00:39:26,790 --> 00:39:30,930
tkun accessed-- l-element ġdid, jekk huwa
miżjud aħħar, ikun aċċessata l-aħħar.

810
00:39:30,930 --> 00:39:34,416
>> UDJENZA: Tista 'biss tagħti eżempju
ta 'xi ħaġa li kieku [inaudible]

811
00:39:34,416 --> 00:39:37,404
ma 'xi ħaġa b'valur
bħal [inaudible] jew il-valur,

812
00:39:37,404 --> 00:39:38,910
simili kif youd format li?

813
00:39:38,910 --> 00:39:39,785
>> MARIA ZLATKOVA: Sure.

814
00:39:39,785 --> 00:39:42,340

815
00:39:42,340 --> 00:39:46,410
Nista jagħtu eżempju ta 'x'jista
aħna se nagħmlu mal-valur?

816
00:39:46,410 --> 00:39:52,440
Allura dak li inti guys tista 'tkun familjari ma'
huwa li konna marret permezz ta 'firxa

817
00:39:52,440 --> 00:39:55,380
u bażikament stampati
kull wieħed mill-elementi,

818
00:39:55,380 --> 00:40:00,910
per eżempju, bħala parti minn
Lista ordnat jew xi ħaġa li.

819
00:40:00,910 --> 00:40:02,674
Does li jagħmel sens jew irridu to--

820
00:40:02,674 --> 00:40:04,340
UDJENZA: Nistgħu tistampa dawn il-valuri out?

821
00:40:04,340 --> 00:40:13,220
MARIA ZLATKOVA: Yeah, nistgħu jistampaw
u mbagħad bażikament $ valur minħabba li

822
00:40:13,220 --> 00:40:16,570
dan il-valur speċifiku, irridu jkunu
istampar il-valur ġewwa ta 'dan.

823
00:40:16,570 --> 00:40:20,150
Hekk jekk konna fl-ewwel iterazzjoni tagħna
ta 'dan u aħna stampati valur $,

824
00:40:20,150 --> 00:40:23,775
aħna jkollna istampar bar.

825
00:40:23,775 --> 00:40:27,020
>> UDJENZA: Huma hemm ukoll għall
loops fil PHP jew sempliċiment loops foreach?

826
00:40:27,020 --> 00:40:30,430
>> MARIA ZLATKOVA: Hemm
wkoll għal linji fil PHP.

827
00:40:30,430 --> 00:40:33,399
U l-loġika tagħhom huwa l-aktar l-
istess bħal dak li inti kont qed użati biex.

828
00:40:33,399 --> 00:40:34,690
UDJENZA: Allura valur tagħha huwa null.

829
00:40:34,690 --> 00:40:35,090
MARIA ZLATKOVA: Huwa bħall-istess.

830
00:40:35,090 --> 00:40:35,590
Yeah.

831
00:40:35,590 --> 00:40:37,747
UDJENZA: Jien biss ser jistaqsu.

832
00:40:37,747 --> 00:40:39,695
Allura meta inti tiddikjara
firxa, inti m'għandekx bżonn

833
00:40:39,695 --> 00:40:42,617
li tgħid liema daqs li għaddej biex
jkun, li jfisser li inti tista 'sempliċement

834
00:40:42,617 --> 00:40:44,417
żid u jieħdu bogħod elementi [inaudible].

835
00:40:44,417 --> 00:40:45,250
MARIA ZLATKOVA: Yup.

836
00:40:45,250 --> 00:40:45,750
Yup.

837
00:40:45,750 --> 00:40:46,251
Eżattament.

838
00:40:46,251 --> 00:40:48,875
Meta aħna niddikjaraw firxa, aħna
m'għandhomx bżonn li jgħidu liema daqs li hi,

839
00:40:48,875 --> 00:40:51,022
hekk nistgħu biss żid elementi
fuq dan aktar tard ukoll.

840
00:40:51,022 --> 00:40:55,075

841
00:40:55,075 --> 00:40:55,700
Aktar mistoqsijiet?

842
00:40:55,700 --> 00:40:59,870

843
00:40:59,870 --> 00:41:05,950
B'hekk tinħoloq PHP u HTML flimkien,
dak li għandna seen-- ukoll,

844
00:41:05,950 --> 00:41:15,130
per eżempju, f'dan l-eżempju, għandna
forma HTML li għandha kamp input.

845
00:41:15,130 --> 00:41:18,830
>> U l-qasam input huwa biss isem
u mbagħad hija għandha Issottometti buttuna.

846
00:41:18,830 --> 00:41:26,040
U meta inti agħfas il-Issottometti
buttuna, fil-fajl hello.php tagħna,

847
00:41:26,040 --> 00:41:32,130
minħabba li l-metodu għall-formola hija
nikseb, nistgħu aċċess kollu li huwa fil-isem

848
00:41:32,130 --> 00:41:40,360
minn din tikseb varjabbli globali li
is-- l sintassi għall huwa $ _GET.

849
00:41:40,360 --> 00:41:44,520
U allura nistgħu aċċess ikun x'ikun il-
jintuza mill-utent ġewwa ta 'dik il-formola għall-isem

850
00:41:44,520 --> 00:41:47,410
billi tispeċifika l-isem ta 'dik il-qasam.

851
00:41:47,410 --> 00:41:51,480

852
00:41:51,480 --> 00:41:55,060
>> Kwalunkwe mistoqsijiet oħra jew kwalunkwe
mistoqsijiet dwar dan l-eżempju speċifiku?

853
00:41:55,060 --> 00:41:58,275
>> UDJENZA: Fejn hi l-PHP?

854
00:41:58,275 --> 00:41:59,150
MARIA ZLATKOVA: Hawnhekk.

855
00:41:59,150 --> 00:42:01,150
Allura dan huwa tag ftuħ tagħna għall-PHP.

856
00:42:01,150 --> 00:42:01,530
>> UDJENZA: Oh, id-dritt.

857
00:42:01,530 --> 00:42:02,363
>> MARIA ZLATKOVA: Iva.

858
00:42:02,363 --> 00:42:05,320

859
00:42:05,320 --> 00:42:09,609
>> HANNAH Blumberg:? Il-= hija shorthand
għal dan hija PHP u biss eku.

860
00:42:09,609 --> 00:42:10,150
UDJENZA: Oh.

861
00:42:10,150 --> 00:42:10,720
MARIA ZLATKOVA: Yeah, sorry.

862
00:42:10,720 --> 00:42:12,040
I għandu jkollhom dan b'mod espliċitu.

863
00:42:12,040 --> 00:42:13,759
>> HANNAH Blumberg: Stampa.

864
00:42:13,759 --> 00:42:16,800
MARIA ZLATKOVA: Huwa biss il-funzjoni
li jippermetti li jistampaw xi ħaġa.

865
00:42:16,800 --> 00:42:19,795

866
00:42:19,795 --> 00:42:20,420
Kwistjoni kbira.

867
00:42:20,420 --> 00:42:24,140

868
00:42:24,140 --> 00:42:25,495
Allura going-- iva.

869
00:42:25,495 --> 00:42:31,940
>> UDJENZA: hemm se jkun pjuttost
daqsxejn ta 'kodifikazzjoni idejn ta PHP u HTML

870
00:42:31,940 --> 00:42:33,450
fuq kwizz 1?

871
00:42:33,450 --> 00:42:36,310

872
00:42:36,310 --> 00:42:38,810
MARIA ZLATKOVA: Jista 'jkun hemm
ammont ġust ta 'interpretazzjoni

873
00:42:38,810 --> 00:42:43,330
ta PHP u HTML, mhux neċessarjament
bħal ammont kbir ta 'kodifikazzjoni,

874
00:42:43,330 --> 00:42:46,960
għalkemm inti jista 'jkollok jiktbu
loop foreach, għalkemm, għal loop.

875
00:42:46,960 --> 00:42:49,790
Kull waħda mill-linji li aħna
tkopri hawnhekk huwa logħba ġust.

876
00:42:49,790 --> 00:42:51,889
U li l-aktar it.

877
00:42:51,889 --> 00:42:53,430
HANNAH Blumberg: I ​​se tkun ippreparata.

878
00:42:53,430 --> 00:42:57,010
Bl-istess mod li aħna talab li inti
jiktbu mazz ta 'funzjonijiet Ċ fuq kwizz 0,

879
00:42:57,010 --> 00:42:59,766
Inkun lest li jagħmlu l-
istess fil-PHP u JavaScript.

880
00:42:59,766 --> 00:43:00,640
MARIA ZLATKOVA: Yeah.

881
00:43:00,640 --> 00:43:03,210
HANNAH Blumberg: Jien ngħid
a little-- bħal aħna mhux qed

882
00:43:03,210 --> 00:43:06,251
se tagħmel inti jiktbu HTML enormi
paġna biss għaliex dan huwa xi ftit

883
00:43:06,251 --> 00:43:08,240
tedious, iżda inti jista 'jkollok partijiet.

884
00:43:08,240 --> 00:43:09,310
C'est logħba totalment ġust.

885
00:43:09,310 --> 00:43:11,082
Bħal paġna HTML żgħar, totalment ġust.

886
00:43:11,082 --> 00:43:11,623
UDJENZA: OK.

887
00:43:11,623 --> 00:43:13,814
Kif dwar fil JavaScript kif ukoll?

888
00:43:13,814 --> 00:43:14,730
HANNAH Blumberg: Yeah.

889
00:43:14,730 --> 00:43:15,250
Logħba ġust JavaScript s.

890
00:43:15,250 --> 00:43:15,635
>> MARIA ZLATKOVA: Yeah.

891
00:43:15,635 --> 00:43:16,801
C'est logħba kompletament ġust.

892
00:43:16,801 --> 00:43:19,280
HANNAH Blumberg: Aħna ser tingħata
għal dak fil bħal 10 minuta.

893
00:43:19,280 --> 00:43:23,750
>> MARIA ZLATKOVA: SQL, għal darb'oħra,
Strutturat Mistoqsija Lingwa.

894
00:43:23,750 --> 00:43:28,651
Bażikament jippermetti li jimmaniġġjaw data
fil-ġestjoni ta 'database relazzjonali

895
00:43:28,651 --> 00:43:29,150
sistema.

896
00:43:29,150 --> 00:43:31,149
Li ftit bażikament ifisser
li għandna x'imkien

897
00:43:31,149 --> 00:43:37,980
li jaħżen xi data li aħna tista 'tixtieq li
użu fil-websajt jew f'xi forma oħra.

898
00:43:37,980 --> 00:43:42,190
U allura għandna mistoqsijiet biex jiksbu
informazzjoni mid-database tagħna,

899
00:43:42,190 --> 00:43:44,320
u lanqas li jiddaħħlu informazzjoni fihom.

900
00:43:44,320 --> 00:43:47,560
A lott ta 'l-ones-- AĠĠORNAMENT komuni,
DAĦĦAL, TAGĦŻEL, u ħassar.

901
00:43:47,560 --> 00:43:50,790
>> Allura għal AĠĠORNAMENT, dan huwa l-sintassi
għall-aġġornament tad-data fid-database.

902
00:43:50,790 --> 00:43:53,330

903
00:43:53,330 --> 00:43:57,340
Aġġornament din it-tabella msejħa
tabella billi qal SET,

904
00:43:57,340 --> 00:44:04,170
nistgħu stabbilit xi valuri b'kollox
ringieli għal xi ħaġa ugwali ħaġa oħra.

905
00:44:04,170 --> 00:44:09,410
Allura nistgħu wkoll tispeċifika xi speċifiku
entrati li rridu li jimmodifika

906
00:44:09,410 --> 00:44:11,240
u li jista 'jkun bl-użu fejn.

907
00:44:11,240 --> 00:44:16,380
U nistgħu jispeċifikaw li aħna biss jixtiequ li
timmodifika xi ringieli fejn l-dar għall-

908
00:44:16,380 --> 00:44:19,830
jekk kellna tabella ta 'studenti
u l-istudenti kollha kellhom dar,

909
00:44:19,830 --> 00:44:24,890
hekk aħna se timmodifika biss xi valuri
fejn dar ugwali Currier,

910
00:44:24,890 --> 00:44:25,430
pereżempju.

911
00:44:25,430 --> 00:44:29,120

912
00:44:29,120 --> 00:44:31,800
>> Għal DAĦĦAL, nistgħu daħħal
ċerti valuri ġo tabella.

913
00:44:31,800 --> 00:44:35,150
Allura ddaħħal fil-mejda,
u allura l-valuri,

914
00:44:35,150 --> 00:44:39,080
u mbagħad fil-parentesi, aħna jispeċifikaw
li valuri inti tixtieq li daħħal.

915
00:44:39,080 --> 00:44:43,220
Allura ddaħħal fil-mejda, col1 u
col2, il-valur huwa val1 u val2.

916
00:44:43,220 --> 00:44:48,930
Allura dan inserts bażikament ringiela ġdida fis
tabella li jkun fiha l-valuri 1 u 2

917
00:44:48,930 --> 00:44:50,850
taħt il-kolonni 1 u 2.

918
00:44:50,850 --> 00:44:54,760
>> U allura aħna qed tmur biex jmorru fuq
eżempju malajr ta 'kif dan jistenna

919
00:44:54,760 --> 00:44:56,310
bħal fid-database tagħna ftit.

920
00:44:56,310 --> 00:44:58,685
Iżda din il-mistoqsija finali li I
think we qed tmur biex jmorru fuq,

921
00:44:58,685 --> 00:45:01,450
SELECT, hija biss jippermetti
biex tagħżel data minn tabella

922
00:45:01,450 --> 00:45:03,080
li possibilment jużawh wara.

923
00:45:03,080 --> 00:45:05,830
U l-mod kif nagħmlu dan hija aħna
biss jaħżnuh f'xi varjabbli.

924
00:45:05,830 --> 00:45:07,780
U allura nistgħu possibilment użu mill-ġdid.

925
00:45:07,780 --> 00:45:10,260
>> Allura star TAGĦŻEL ifisser tagħżel kollha.

926
00:45:10,260 --> 00:45:13,280
Li jinsab biss shorthand
għall-għażla kollha.

927
00:45:13,280 --> 00:45:19,760
MILL tabella FEJN, aħna qegħdin ifittxu
għal xi kondizzjonijiet speċifiċi,

928
00:45:19,760 --> 00:45:22,290
dan meta kolonna ugwali
xi ħaġa, per eżempju.

929
00:45:22,290 --> 00:45:24,410
Jekk aħna biss riedu
tagħżel kollha mit-tabella,

930
00:45:24,410 --> 00:45:28,400
dan biss jagħżel kolonni kollha
u ringieli kollha minn tabella.

931
00:45:28,400 --> 00:45:32,040
>> U imbagħad tħassar mit-tabella
FEJN col ugwali xi ħaġa,

932
00:45:32,040 --> 00:45:36,440
Dan iħassar biss ftit
ringiela mit-tabella tagħna

933
00:45:36,440 --> 00:45:38,860
fejn għandna xi kundizzjonijiet speċifiċi.

934
00:45:38,860 --> 00:45:41,870
F'dan il-każ, il-kundizzjonijiet
huma kolonna ugwali xi ħaġa.

935
00:45:41,870 --> 00:45:43,460
Hekk biss eżempju ta 'malajr ta' din.

936
00:45:43,460 --> 00:45:49,100
Jekk għandna din it-tabella dritt hawn u aħna
daħħalha fis-tabella, dawn il-valuri,

937
00:45:49,100 --> 00:45:50,400
li tara li tintroduċi linja ġdida.

938
00:45:50,400 --> 00:45:56,380
U jekk kellna auto-inkrement, dan kieku
biss inkrement ID tagħna minn 0 biex 1 sa 2.

939
00:45:56,380 --> 00:46:00,010
>> Jekk aħna magħżula kollha minn studenti, huwa
jirritorna l-oqsma kollha u ringieli kollha.

940
00:46:00,010 --> 00:46:02,430
Fejn sena huwa akbar
minn jew ugwali għal 2,016,

941
00:46:02,430 --> 00:46:04,390
li kien biss ritorn
Hannah u myself.

942
00:46:04,390 --> 00:46:08,360
U allura jekk aħna biss magħżula
sena id u s-sena MILL istudenti

943
00:46:08,360 --> 00:46:11,710
fejn l-dar hija Cabot House, li
kieku, għal darb'oħra, ritorn Hannah u myself.

944
00:46:11,710 --> 00:46:14,430
>> Imbagħad jekk aħna mħassra minn studenti
fejn isem huwa ugwali għal Rob,

945
00:46:14,430 --> 00:46:16,760
li tħassar il-filliera kollu.

946
00:46:16,760 --> 00:46:19,696
U allura jekk aħna waqqafna l-
isem, l-istudenti UPDATE

947
00:46:19,696 --> 00:46:21,570
Isem SET ugwali għal Daven
FEJN dar hija ugwali

948
00:46:21,570 --> 00:46:27,010
Cabot House, li għaddej biex tmur
dawk ringieli u mbagħad taġġorna l-isem.

949
00:46:27,010 --> 00:46:31,470
>> U mbagħad ftit tipi ta 'data SQL huma
CHAR, varchar, INT, u float.

950
00:46:31,470 --> 00:46:32,760
Dawn huma ġusti logħba.

951
00:46:32,760 --> 00:46:36,740
I imur aktar mill-ġdid
u aċċerta ruħek li jafu

952
00:46:36,740 --> 00:46:40,930
u jkollhom magħhom fuq folja iqarrqu tiegħek,
liema kull waħda minn dawn karattri

953
00:46:40,930 --> 00:46:44,140
ġew użati għal, dak
inti użati minnhom fuq psets tiegħek,

954
00:46:44,140 --> 00:46:48,050
u tagħmel żgur li int familjari u
komdu ma jkollhom għalfejn jagħżlu

955
00:46:48,050 --> 00:46:51,450
minn tipi differenti ta 'data fil pset tiegħek.

956
00:46:51,450 --> 00:46:51,950
Iva.

957
00:46:51,950 --> 00:46:54,300
>> UDJENZA: Liema kien dik it-tabella maħżuna?

958
00:46:54,300 --> 00:46:57,119
Yeah, fejn ikun din it-tabella maħżuna?

959
00:46:57,119 --> 00:46:59,160
MARIA ZLATKOVA: Well,
dritt issa, mhuwiex maħżuna.

960
00:46:59,160 --> 00:47:00,700
Xorta waħda, fejn ikun din it-tabella maħżuna?

961
00:47:00,700 --> 00:47:04,503
Imma tista 'tkun maħżuna f'database SQL.

962
00:47:04,503 --> 00:47:07,330
>> UDJENZA: U fejn huwa l-database SQL?

963
00:47:07,330 --> 00:47:11,200
Fil-kompjuter, online
x'imkien, il-server?

964
00:47:11,200 --> 00:47:15,000
>> MARIA ZLATKOVA: Hija tista 'tkun
numru ta 'affarijiet differenti.

965
00:47:15,000 --> 00:47:19,690
>> HANNAH Blumberg: Imxejna interfaced ma
Tabelli SQL aktar bl phpMyAdmin.

966
00:47:19,690 --> 00:47:22,060
Allura nistgħu jistaqsu server
biex jaħżinhom għalina.

967
00:47:22,060 --> 00:47:23,830
Nistgħu jaħżinhom fuq il-kompjuter tagħna stess.

968
00:47:23,830 --> 00:47:27,950
>> MARIA ZLATKOVA: Hija biss tiddependi fuq
kif inti tixtieq li tagħmel dan għalik innifsek.

969
00:47:27,950 --> 00:47:30,075
Iżda aħna ġew ħażna
minnhom, kif Hannah imsemmi,

970
00:47:30,075 --> 00:47:31,755
fuq phpMyAdmin, li huwa online.

971
00:47:31,755 --> 00:47:36,550

972
00:47:36,550 --> 00:47:39,280
U allura l-mod li bih nużaw
PHP u SQL, aħna jaħżnu

973
00:47:39,280 --> 00:47:43,450
fis xi varjabbli
dak li konna kkonsultat għal.

974
00:47:43,450 --> 00:47:48,370
>> Allura jekk aħna tagħżel kollha mill-istorja
fejn UTENT huwa daqs il-SESSJONI id,

975
00:47:48,370 --> 00:47:53,900
li tagħżel l-fillieri
għall-persuna speċifika li

976
00:47:53,900 --> 00:47:58,327
huwa illoggjat mill-istorja
mejda u sort tagħhom fiċ ringieli.

977
00:47:58,327 --> 00:48:00,410
A ħaġa jibred hija li tkun taf
dik il-funzjoni mistoqsija CS50 s

978
00:48:00,410 --> 00:48:02,180
jipproteġi kontra tags injezzjoni SQL.

979
00:48:02,180 --> 00:48:07,420
Li sempliċiment ifisser li hija tiżgura
l-input li tiddaħħal hija korretta

980
00:48:07,420 --> 00:48:09,920
u li l-persuna li
dieħla l-input

981
00:48:09,920 --> 00:48:15,100
hija mhijiex qed tipprova input xi malizzjużi
kodiċi li jew tinżel tabelli tagħna

982
00:48:15,100 --> 00:48:17,305
jew tħassar kollox
ġewwa tal database tagħna.

983
00:48:17,305 --> 00:48:20,060

984
00:48:20,060 --> 00:48:23,400
>> Ħarsa ġenerali tal-
Mudell Mudell View Kontrollur,

985
00:48:23,400 --> 00:48:27,360
huwa biss mod kif jiġi organizzat
u l-ħsieb dwar kodiċi.

986
00:48:27,360 --> 00:48:29,100
Mill-ġdid l-mudell tad-disinn.

987
00:48:29,100 --> 00:48:33,380
X'inhu dan ifisser huwa li aħna
can-- u huwa prattika tajba

988
00:48:33,380 --> 00:48:37,790
biex jiġu separati partijiet differenti
tal-kodiċi tagħna u dak li

989
00:48:37,790 --> 00:48:40,530
jikkontrollaw fi dawn it-tliet mudelli.

990
00:48:40,530 --> 00:48:46,700
>> Allura fehma tagħna huwa l-aktar spiss tagħna
templates, tqassim tagħna, il-mod

991
00:48:46,700 --> 00:48:48,260
li waqqafna kif kodiċi tagħna jistenna.

992
00:48:48,260 --> 00:48:55,190
Li l-aktar fajls CSS tagħna u l-mod
li aħna definit d-disinn tal-kodiċi tagħna,

993
00:48:55,190 --> 00:48:55,710
bażikament.

994
00:48:55,710 --> 00:48:59,280
Kontrollur tagħna huwa l-aktar dak
aħna kont qed tagħmel ma 'fajls PHP.

995
00:48:59,280 --> 00:49:03,030
Għalhekk għal darb'oħra, li jaħdmu ma 'l-
informazzjoni li għandna

996
00:49:03,030 --> 00:49:06,700
u jiddefinixxi kif l
informazzjoni hija użata,

997
00:49:06,700 --> 00:49:10,660
u mbagħad jgħaddi dik l-informazzjoni
jew fuq il-fehma jew il-mudell.

998
00:49:10,660 --> 00:49:13,880
U l-mudell, il-mod li konna
kienu jużaw jiġifieri kien database tagħna,

999
00:49:13,880 --> 00:49:17,510
hekk fejn l-informazzjoni tagħna huwa
maħżuna u għalhekk għandha xi mkien

1000
00:49:17,510 --> 00:49:21,490
li jgħixu fi, u xi wieħed minn
kodiċi li tirrigwarda l-mod

1001
00:49:21,490 --> 00:49:25,410
li nagħmlu dik l-informazzjoni jew l-
mod li aħna aġġornament dik l-informazzjoni.

1002
00:49:25,410 --> 00:49:28,940

1003
00:49:28,940 --> 00:49:33,200
>> Allura fil-mudell MVC, HTTP
talbiet jintbagħtu lil web server.

1004
00:49:33,200 --> 00:49:36,220
Imbagħad, il-tinterpreta kontrollur
it-talba mill-utent

1005
00:49:36,220 --> 00:49:38,260
u mbagħad tivvalida l-input utent.

1006
00:49:38,260 --> 00:49:41,580
Huwa obbligatorju li għandna
il-kontrollur jikkomunika

1007
00:49:41,580 --> 00:49:44,000
ma 'mudell, hekk xi ħaġa
bħal database tagħna

1008
00:49:44,000 --> 00:49:47,500
jew xi funzjonalità oħra
li tittrażmetti l-informazzjoni.

1009
00:49:47,500 --> 00:49:50,340
U mbagħad finalment, il-kontrollur
tgħaddi informazzjoni fuq il-fehma

1010
00:49:50,340 --> 00:49:52,090
sabiex ikun jista 'jkun
mogħtija u li tista '

1011
00:49:52,090 --> 00:49:55,860
jsiru viżibbli għal kull persuna
aċċess għall-web page.

1012
00:49:55,860 --> 00:49:58,440

1013
00:49:58,440 --> 00:50:01,340
>> Kwalunkwe mistoqsijiet?

1014
00:50:01,340 --> 00:50:01,840
Tal-biża.

1015
00:50:01,840 --> 00:50:04,530

1016
00:50:04,530 --> 00:50:08,469
Għalhekk għal darb'oħra, il-mudell,
funzjoni tiegħu, għal darb'oħra,

1017
00:50:08,469 --> 00:50:11,260
huma l-ħażna persistenti ta 'informazzjoni,
ġestjoni u organizzazzjoni ta 'dejta.

1018
00:50:11,260 --> 00:50:13,890
U dak li aħna stajt tidher hekk
ferm hija d-database MySQL

1019
00:50:13,890 --> 00:50:16,200
u xi fajls ta 'data li tista' tuża.

1020
00:50:16,200 --> 00:50:20,580
>> View, il-preżentazzjoni ta 'informazzjoni lill
l-utent, il-UI, jew interface għall-utent.

1021
00:50:20,580 --> 00:50:22,350
U l-eżempju ta 'dan huwa HTML.

1022
00:50:22,350 --> 00:50:23,950
U allura aħna jista 'jkollhom PHP minimu.

1023
00:50:23,950 --> 00:50:28,360
Allura għal loop li ttenni
fuq data li jirriżultaw f'dokument stampat

1024
00:50:28,360 --> 00:50:30,720
huwa parti mill-opinjoni, kif
kuntrarju għall-kontrollur.

1025
00:50:30,720 --> 00:50:35,660
U mbagħad lott ta 'fajls PHP tagħna
jaqgħu fil-kategorija kontrollur.

1026
00:50:35,660 --> 00:50:38,410
Hija biss jieħu ħsieb talbiet ta 'utenti u
gets informazzjoni mill-mudell.

1027
00:50:38,410 --> 00:50:42,880

1028
00:50:42,880 --> 00:50:45,590
>> Jaqbeż fis-Dokument
Mudell Għan, dan biss

1029
00:50:45,590 --> 00:50:47,700
tirreferi għall-mod HTML
dokumenti huma organizzati.

1030
00:50:47,700 --> 00:50:51,600
U dawn qed organizzati fi siġra
struttura li għandha ġerarkija.

1031
00:50:51,600 --> 00:50:56,720
Mela jekk ikollna aċċess għal [inaudible]
rappreżentazzjoni tad-dokument,

1032
00:50:56,720 --> 00:51:02,750
nistgħu naħdmu mal-dokument, bħal
aħna jimmanipulaw oġġetti bażikament.

1033
00:51:02,750 --> 00:51:06,630
>> U biex tagħmel dan
ftit aktar ċara, meta

1034
00:51:06,630 --> 00:51:10,540
għandna ħafna ta 'tagħna
tags differenti jirrispondu

1035
00:51:10,540 --> 00:51:12,590
għal rotot differenti fil siġra tagħna.

1036
00:51:12,590 --> 00:51:17,070
U mbagħad għal dan l-eżempju, aħna
id-dokument node bidu.

1037
00:51:17,070 --> 00:51:20,010
Għandna, allura, node HTML tagħna
li qasmiet fis-kap u l-korp.

1038
00:51:20,010 --> 00:51:22,810
Ras għandha titolu u mbagħad
titolu jinkludi hello, dinja.

1039
00:51:22,810 --> 00:51:24,860
U l-ġisem tagħna biss fiha
hello, dinja kif ukoll.

1040
00:51:24,860 --> 00:51:28,700

1041
00:51:28,700 --> 00:51:31,900
>> Allura xi mistoqsijiet dwar xi tal-
affarijiet li aħna koperti s'issa?

1042
00:51:31,900 --> 00:51:35,891
U jekk le, Hannah se
tieħu f'idejha bl JavaScript.

1043
00:51:35,891 --> 00:51:36,390
Tal-biża.

1044
00:51:36,390 --> 00:51:37,473
>> HANNAH Blumberg: OK, berred.

1045
00:51:37,473 --> 00:51:40,980
Jekk xejn jitla 'ma PHP jew HTML,
jew kwalunkwe mill-għalf Maria koperti,

1046
00:51:40,980 --> 00:51:42,700
nistgħu dejjem nieqaf.

1047
00:51:42,700 --> 00:51:46,430
Aħna qed jagħmlu aħjar fuq
ħin mill-ġdid, hekk tal-biża.

1048
00:51:46,430 --> 00:51:48,770
U biss li jmorru lura
verament malajr għal dan,

1049
00:51:48,770 --> 00:51:51,010
jekk inti tħares lejn kull
eżami sena li għaddiet, dan

1050
00:51:51,010 --> 00:51:54,120
jitla 'either-- hawnhekk hija
xi HTML, jagħmlu dan dijagramma.

1051
00:51:54,120 --> 00:51:58,380
Jew hawn f'din l-istampa, jagħmlu xi
HTML, hekk definittivament prattika li.

1052
00:51:58,380 --> 00:52:01,500
U allura li wieħed garantit
kwistjoni li tista 'tikseb id-dritt.

1053
00:52:01,500 --> 00:52:02,000
Kessaħ.

1054
00:52:02,000 --> 00:52:04,510
Mela ejja nitkellmu dwar JavaScript
u kif huwa ftit

1055
00:52:04,510 --> 00:52:09,130
differenti minn lingwi bħal PHP u
C, iż-żewġ lingwi rajna qabel.

1056
00:52:09,130 --> 00:52:10,780
Allura numru wieħed, huwa laxk ittajpjat.

1057
00:52:10,780 --> 00:52:14,630
Dan huwa simili PHP, imma b'differenza C.

1058
00:52:14,630 --> 00:52:15,890
>> Huwa ta 'lingwa interpretati.

1059
00:52:15,890 --> 00:52:19,870
Għal darb'oħra, dan huwa simili
PHP, b'differenza C. U dan

1060
00:52:19,870 --> 00:52:24,630
se jippermettilna naslu biex use-- dan
taħdem verament nicely ma 'paġni tal-web.

1061
00:52:24,630 --> 00:52:28,350
Huwa ser inessu jimmanipulaw
il-kontenut u kif jidher

1062
00:52:28,350 --> 00:52:30,300
u dak li tagħmel.

1063
00:52:30,300 --> 00:52:32,330
>> Aħna qed tmur biex tara xi ftit ta 'Ajax.

1064
00:52:32,330 --> 00:52:36,140
Dan jippermetti li jikkomunikaw
asynchronously ma 'servers differenti

1065
00:52:36,140 --> 00:52:37,950
u jiksbu informazzjoni.

1066
00:52:37,950 --> 00:52:42,820
U dan huwa l-ħaġa li verament
jifred JavaScript minn PHP u C

1067
00:52:42,820 --> 00:52:45,590
hija li huwa client-side.

1068
00:52:45,590 --> 00:52:49,860
Kemm PHP u C huma
tipikament server-side.

1069
00:52:49,860 --> 00:52:51,960
>> Għall-parti l-kbira u
kważi kompletament liema

1070
00:52:51,960 --> 00:52:53,900
Rajna, għall-inqas fil
din il-klassi, JavaScript

1071
00:52:53,900 --> 00:52:57,040
jaġixxi fuq client-side, li jfisser
li l-browser huwa attwalment

1072
00:52:57,040 --> 00:52:58,597
responsabbli għall-ġestjoni tiegħu.

1073
00:52:58,597 --> 00:53:01,180
U dan ifisser li aħna ma
jeħtieġ li jinteraġixxu ma 'l-server.

1074
00:53:01,180 --> 00:53:04,380
Allura dan ifisser li jista 'jkun ħafna aktar malajr
għaliex dan huwa attwalment biss huwa Chrome,

1075
00:53:04,380 --> 00:53:10,420
huwa Safari, huwa Firefox, tkun xi tkun
użu attwalment taħdem tiegħek JavaScript.

1076
00:53:10,420 --> 00:53:12,290
>> UDJENZA: X'tagħmel mhux sinkroniku jfisser?

1077
00:53:12,290 --> 00:53:13,620
>> HANNAH Blumberg: Ah, liema
ma asynchronously jfisser?

1078
00:53:13,620 --> 00:53:14,250
Kwistjoni kbira.

1079
00:53:14,250 --> 00:53:17,890
Asynchronously means--
ukoll, il-kontenut li fih

1080
00:53:17,890 --> 00:53:22,140
nużaw huwa, OK, aħna
qed joħolqu page web

1081
00:53:22,140 --> 00:53:23,860
u għandna bżonn biex nikseb xi informazzjoni.

1082
00:53:23,860 --> 00:53:28,250
Allura bl-eżempju ta mashup,
xi informazzjoni li aħna tista 'tixtieq

1083
00:53:28,250 --> 00:53:30,580
huwa titoli artikolu.

1084
00:53:30,580 --> 00:53:33,330
Issa, aħna could-- għażla waħda
huwa li tagħmel dan synchronously

1085
00:53:33,330 --> 00:53:37,940
u dan ifisser li let
stop, mur jiksbu l-artikolu,

1086
00:53:37,940 --> 00:53:41,275
jiksbu l-artikolu lura, u mbagħad
tirrendi, iżda li tkun verament bil-mod.

1087
00:53:41,275 --> 00:53:44,150
Dan ikun l-esperjenza ħażina utent
għaliex inti biss tkun seduta

1088
00:53:44,150 --> 00:53:46,630
stennija hemm għal xi ħaġa biex jirrispondu.

1089
00:53:46,630 --> 00:53:50,020
>> Asynchronously ifisser aħna ser
tkompli tmur dwar in-negozju tagħna,

1090
00:53:50,020 --> 00:53:52,529
tirrendi l-paġna, u
aħna ser tibgħat off talba

1091
00:53:52,529 --> 00:53:54,570
thats it-tip ta 'ser
jiġri fl-isfond.

1092
00:53:54,570 --> 00:53:57,610
I think aħna nużaw l-eżempju
lecture ta 'sejħa Rob u qal,

1093
00:53:57,610 --> 00:53:59,980
ħej, inti tista 'tfittex dan up
għalija u terġa 'lura lili,

1094
00:53:59,980 --> 00:54:02,870
għall-kuntrarju biss lili
stennija fuq it-telefon.

1095
00:54:02,870 --> 00:54:07,020
Allura asynchronously ifisser li jiġri
fl-isfond bogħod minna

1096
00:54:07,020 --> 00:54:08,676
b'mod parallel.

1097
00:54:08,676 --> 00:54:10,400
>> Kwistjoni kbira.

1098
00:54:10,400 --> 00:54:11,830
Xi ħaġa oħra?

1099
00:54:11,830 --> 00:54:12,330
Great.

1100
00:54:12,330 --> 00:54:15,020
Aħna ser jaqbżu ħafna aktar fis
talbiet mhux sinkroniku ma Ajax.

1101
00:54:15,020 --> 00:54:18,287
>> UDJENZA: Does JavaScript-- fejn ma
jaqa bil mudell ħsieb kontrollur?

1102
00:54:18,287 --> 00:54:19,620
HANNAH Blumberg: mistoqsija Great.

1103
00:54:19,620 --> 00:54:23,320
Fejn ma JavaScript jaqgħu
bil mudell ħsieb-kontrollur?

1104
00:54:23,320 --> 00:54:23,930
Hm.

1105
00:54:23,930 --> 00:54:28,350
I raden dan jista 'fall--
hekk aħna normalment ma

1106
00:54:28,350 --> 00:54:31,340
simili li squish fis li
paradigma, imma I raden I ngħid,

1107
00:54:31,340 --> 00:54:34,280
OK, so JavaScript
fil-fatt se jippermetti

1108
00:54:34,280 --> 00:54:37,587
us biex tiġbor data,
jinterpretaw id-data, fil-fatt jagħmlu

1109
00:54:37,587 --> 00:54:38,920
affarijiet sinifikanti mad-data.

1110
00:54:38,920 --> 00:54:41,100
B'dan il-mod, huwa ferm 'kontroll simili.

1111
00:54:41,100 --> 00:54:43,900
>> Iżda huwa wkoll se jippermettilna naslu biex
wiri affarijiet u affarijiet stampati.

1112
00:54:43,900 --> 00:54:47,021
B'dan il-mod, huwa ferm 'opinjoni simili.

1113
00:54:47,021 --> 00:54:47,520
Yeah.

1114
00:54:47,520 --> 00:54:51,710
Allura huwa tip simili PHP fil
fejn jista 'tip ta' jkun kemm.

1115
00:54:51,710 --> 00:54:53,330
Tajba kwistjoni.

1116
00:54:53,330 --> 00:54:55,209
Xi ħaġa oħra?

1117
00:54:55,209 --> 00:54:56,000
Dritt kollox, biża '.

1118
00:54:56,000 --> 00:54:57,120
Nimxu dritt flimkien.

1119
00:54:57,120 --> 00:54:59,110
>> Mela ejja ara eżempju
ta 'kif nistgħu nużaw

1120
00:54:59,110 --> 00:55:02,250
JavaScript f'wieħed mill-programmi tal-web tagħna.

1121
00:55:02,250 --> 00:55:05,680
So I ser jikkunsidraw dan
index.html bil-mazz ta 'HTML.

1122
00:55:05,680 --> 00:55:08,800
U l-ħaġa nixtieq
tiffoka fuq hija din tag iskrittura.

1123
00:55:08,800 --> 00:55:13,280
U dan jgħid, OK, I tixtieq li tmexxi xi
JavaScript u hawn huwa fejn jgħix.

1124
00:55:13,280 --> 00:55:15,400
Hija jgħix fil hello.js.

1125
00:55:15,400 --> 00:55:21,120
>> U simili ħafna CSS, nistgħu
tpoġġi JavaScript fil-HTML.

1126
00:55:21,120 --> 00:55:24,000
Għaliex jista irridu li tissepara it out?

1127
00:55:24,000 --> 00:55:24,500
Yeah.

1128
00:55:24,500 --> 00:55:25,486
>> UDJENZA: Aktar faċli biex jikteb?

1129
00:55:25,486 --> 00:55:26,402
>> HANNAH Blumberg: Yeah.

1130
00:55:26,402 --> 00:55:28,450
Huwa aktar faċli għall-użu madwar
paġni web differenti.

1131
00:55:28,450 --> 00:55:29,980
Hija żżomm affarijiet aktar nodfa.

1132
00:55:29,980 --> 00:55:32,090
Huwa biss prattika tajba.

1133
00:55:32,090 --> 00:55:32,590
Tal-biża.

1134
00:55:32,590 --> 00:55:33,930
Tweġiba tajba.

1135
00:55:33,930 --> 00:55:36,690
Hekk tajjeb, għalhekk dan qed jiġri
li jkun index.html tagħna.

1136
00:55:36,690 --> 00:55:39,430
U allura l hawnhekk hija tagħna
ċkejkna fajl JavaScript ftit.

1137
00:55:39,430 --> 00:55:42,410
>> U kull ma jgħid hu twissija Hello, dinja.

1138
00:55:42,410 --> 00:55:46,040
Allura dak li jiġri huwa meta
din il-paġna renders--

1139
00:55:46,040 --> 00:55:49,680
hekk jekk inti tmur għal dak kollu website
dan is-- dak kollu li jiġri

1140
00:55:49,680 --> 00:55:53,330
huwa li għaddej biex ngħid, OK, jien
ser imexxu dan il-kodiċi JavaScript.

1141
00:55:53,330 --> 00:55:56,370
U dan il-kodiċi JavaScript
biss jgħid twissija Hello, dinja.

1142
00:55:56,370 --> 00:55:59,090
Hekk jien ser tikseb dan
friendly ftit pop-up.

1143
00:55:59,090 --> 00:56:00,360
>> Kessaħ?

1144
00:56:00,360 --> 00:56:04,746
C'est tip simili tagħna ewwel
JavaScript programm, Hello tagħna, dinja.

1145
00:56:04,746 --> 00:56:07,690

1146
00:56:07,690 --> 00:56:12,190
Ejja nħarsu ftit aktar dwar dak li
l sintassi ta JavaScript Dehra.

1147
00:56:12,190 --> 00:56:16,330
U speċifikament, ejja din titqabbel ma '
C u PHP, li konna rajna qabel.

1148
00:56:16,330 --> 00:56:20,610
>> Fl JavaScript, aħna qed tmur biex ikollhom
var, l-isem tal-varjabbli, u mbagħad

1149
00:56:20,610 --> 00:56:21,690
valur attwali tiegħu.

1150
00:56:21,690 --> 00:56:26,170
U aħna ma jispeċifikawx it-tip, biss
bħal fil-PHP, iżda ħafna b'differenza C.

1151
00:56:26,170 --> 00:56:28,850
Għalhekk, per eżempju, jekk ridna
biex jaħżnu l-valur 50,

1152
00:56:28,850 --> 00:56:32,490
fis-C, aħna jkollhom jgħidu,
ħej, C, nixtieq integer,

1153
00:56:32,490 --> 00:56:35,076
Jien ser sejħa hija
i, u l-valur tagħha huwa 50.

1154
00:56:35,076 --> 00:56:36,450
Fil PHP, huwa ftit aktar faċli.

1155
00:56:36,450 --> 00:56:41,880
Aħna ngħidu, ħej, nixtieq varjabbli
imsejħa i u l-valur tagħha huwa 50.

1156
00:56:41,880 --> 00:56:45,890
Ħafna bl-istess mod, fil JavaScript, aħna
jgħidu ħej, nixtieq varjabbli imsejjaħ i,

1157
00:56:45,890 --> 00:56:47,080
valur tagħha huwa 50.

1158
00:56:47,080 --> 00:56:52,140
Kull darba wara li nuża
i, I m'għandhomx bżonn li jiktbu var.

1159
00:56:52,140 --> 00:56:53,810
Huwa biss i minn dak il-punt.

1160
00:56:53,810 --> 00:56:58,660
Bl-istess mod, fis-C, fejn
ladarba aħna ngħidu int i, aħna biss użu i.

1161
00:56:58,660 --> 00:57:00,340
Kessaħ?

1162
00:57:00,340 --> 00:57:01,800
Kull dritt.

1163
00:57:01,800 --> 00:57:03,710
>> Nimxu fuq linji,
fortunatament, dawn kważi

1164
00:57:03,710 --> 00:57:06,720
tħares exactly-- Jien naħseb li qed
eżattament l-istess bħal dak

1165
00:57:06,720 --> 00:57:09,799
loops ser look like fil
xi ħaġa bħal C fejn tiegħek għall loop

1166
00:57:09,799 --> 00:57:11,840
huwa se jkollu tliet
parts-- l inizjalizzazzjoni,

1167
00:57:11,840 --> 00:57:13,640
kundizzjoni, u aġġornament.

1168
00:57:13,640 --> 00:57:15,340
A loop waqt, jidher l-istess eżatt.

1169
00:57:15,340 --> 00:57:16,390
Aħna biss jagħtu kundizzjoni.

1170
00:57:16,390 --> 00:57:18,264
>> U do filwaqt loop,
għal darb'oħra, eżattament l-istess.

1171
00:57:18,264 --> 00:57:20,190
Nagħtu bħala kundizzjoni.

1172
00:57:20,190 --> 00:57:24,510
Ejja ngħidu jien ridt li jtenni over--
Jien ridt li tagħmel xi ħaġa ħames darbiet.

1173
00:57:24,510 --> 00:57:27,840
Fl C, nistgħu jiktbu
għall Iniz i ugwali 0.

1174
00:57:27,840 --> 00:57:30,480
i huwa inqas minn 5, i ++.

1175
00:57:30,480 --> 00:57:34,240
Differenza biss, JavaScript,
minflok ta 'tgħid int i ugwali 0,

1176
00:57:34,240 --> 00:57:36,820
ngħidu i var ikun egwali għal 0.

1177
00:57:36,820 --> 00:57:38,370
Beautiful.

1178
00:57:38,370 --> 00:57:41,320
Dik hija l-unika differenza.

1179
00:57:41,320 --> 00:57:43,200
Kwalunkwe mistoqsijiet dwar xi li?

1180
00:57:43,200 --> 00:57:44,160
Iva.

1181
00:57:44,160 --> 00:57:48,480
>> UDJENZA: Allura fil-PHP, huwa l-istess
ħaġa, ħlief iżda bħal varjabbli?

1182
00:57:48,480 --> 00:57:49,564
Jew kien li eżempju var?

1183
00:57:49,564 --> 00:57:50,480
HANNAH Blumberg: Yeah.

1184
00:57:50,480 --> 00:57:52,310
Allura fil-PHP, li għaddej
li jkun sinjal dollaru.

1185
00:57:52,310 --> 00:57:59,450
Allura li għaddej biex $ i ugwali
0, $ i huwa inqas minn 5, $ i ++.

1186
00:57:59,450 --> 00:58:02,490
Kwistjoni kbira.

1187
00:58:02,490 --> 00:58:04,570
>> Issa ejja nitkellmu dwar
dikjarazzjonijiet funzjoni.

1188
00:58:04,570 --> 00:58:07,010
Fil C, meta aħna ddikjarat
funzjoni, aħna tatha isem

1189
00:58:07,010 --> 00:58:08,490
u aħna tatha xi parametri.

1190
00:58:08,490 --> 00:58:10,670
U fil-bidu, aħna kiteb it-tip.

1191
00:58:10,670 --> 00:58:12,440
Fil JavaScript, kollox aħna
għandek tagħmel hu li tikteb

1192
00:58:12,440 --> 00:58:15,080
il-funzjoni keyword li
jgħid, ħej, JavaScript,

1193
00:58:15,080 --> 00:58:16,570
Jien wasalt biex jiddefinixxu funzjoni.

1194
00:58:16,570 --> 00:58:18,520
>> F'dan il-każ, hija għandha somma isem.

1195
00:58:18,520 --> 00:58:20,820
U li tieħu żewġ argumenti, xuy.

1196
00:58:20,820 --> 00:58:23,280
Avviż li aħna ma 'kura
dwar it-tipi ta 'x uy.

1197
00:58:23,280 --> 00:58:26,280
U bħad C, għandna
dan ir-ritorn keyword,

1198
00:58:26,280 --> 00:58:29,140
hekk nistgħu nagħmlu xi ħaġa
bħal ritorn x uy.

1199
00:58:29,140 --> 00:58:32,540
>> U issa ladarba konna bil-miktub dan l-ewwel
funzjoni, nistgħu nużaw somma kullimkien.

1200
00:58:32,540 --> 00:58:34,740
U li totalment multa.

1201
00:58:34,740 --> 00:58:37,530
Ħaġa waħda verament jibred dwar
JavaScript li huwa ħafna b'differenza C

1202
00:58:37,530 --> 00:58:40,770
huwa li l-funzjonijiet tista
jiġu trattati bħal valuri.

1203
00:58:40,770 --> 00:58:43,895
Allura nistgħu nagħmlu xi ħaġa bħal hawn
fejn I suppose I ikopri dan up--

1204
00:58:43,895 --> 00:58:46,400
I koperti l-għadd var
part-- u aħna biss qal

1205
00:58:46,400 --> 00:58:49,850
xy funzjoni ugwali ritorn x plus y.

1206
00:58:49,850 --> 00:58:52,140
>> Dan huwa dak li se jiġi mistieden
funzjoni anonima.

1207
00:58:52,140 --> 00:58:53,920
Huwa funzjoni mingħajr isem.

1208
00:58:53,920 --> 00:58:56,290
Billi din il jgħid funzjoni
somma, blah, blah, blah,

1209
00:58:56,290 --> 00:58:59,340
dan ikun biss jgħidu funzjoni.

1210
00:58:59,340 --> 00:59:02,020
Imma issa anki jekk I jkollhom
din il-funzjoni anonima,

1211
00:59:02,020 --> 00:59:03,630
dik il-funzjoni hija verament ftit valur.

1212
00:59:03,630 --> 00:59:05,160
Nistgħu titratta dan bħal valur.

1213
00:59:05,160 --> 00:59:10,180
>> Allura nistgħu ħlief fil varjabbli-istess
mod nistgħu jaħżen 50 fil-varjabbli.

1214
00:59:10,180 --> 00:59:13,870
Allura nistgħu ngħidu, OK, I jridu
varjabbli, huwa msejjaħ somma,

1215
00:59:13,870 --> 00:59:16,011
u hija din il-funzjoni.

1216
00:59:16,011 --> 00:59:18,760
Allura dawn iż-żewġ affarijiet huma attwalment
se tagħmel l-istess ħaġa eżatt,

1217
00:59:18,760 --> 00:59:21,576
iżda l-sintassi hija ftit
differenti u tip ta 'nota gost.

1218
00:59:21,576 --> 00:59:22,076
Yeah.

1219
00:59:22,076 --> 00:59:25,548
>> UDJENZA: Allura inti tista 'sejħa għal
funzjoni li kienet anonima billi qal,

1220
00:59:25,548 --> 00:59:28,244
parentesi somma 2, 5?

1221
00:59:28,244 --> 00:59:29,160
HANNAH Blumberg: Yeah.

1222
00:59:29,160 --> 00:59:32,280
Tista 'sejħa dan anonima
funzjoni fl-istess mod.

1223
00:59:32,280 --> 00:59:33,350
Inti se tagħmel somma (2, 5) ;.

1224
00:59:33,350 --> 00:59:36,180

1225
00:59:36,180 --> 00:59:38,200
Dan ikun totalment multa.

1226
00:59:38,200 --> 00:59:41,575
>> Jekk I ma tagħmel somma var ugwali
funzjoni, jekk I biss mħassar

1227
00:59:41,575 --> 00:59:45,480
this-- Naf huwa fuq naħa tiegħi,
imma nippretendu I imħassar this-- mbagħad

1228
00:59:45,480 --> 00:59:46,964
dik il-funzjoni hija tip ta 'ftit marret.

1229
00:59:46,964 --> 00:59:49,630
Inti qatt ma tista 'tuża mill-ġdid minħabba
inti ma għandekx isem għal dan.

1230
00:59:49,630 --> 00:59:53,497
Huwa diffiċli li jirreferu għal xi ħaġa
ma tkunx taf liema sejħa.

1231
00:59:53,497 --> 00:59:54,080
Tajba kwistjoni.

1232
00:59:54,080 --> 00:59:54,580
Yeah.

1233
00:59:54,580 --> 00:59:59,580
>> UDJENZA: Tista referenza somma
postijiet oħra bil-valur ta 'x flimkien y?

1234
00:59:59,580 --> 01:00:01,940
>> HANNAH Blumberg: Tista
somma ta 'referenza f'postijiet oħra

1235
01:00:01,940 --> 01:00:03,360
bl-x-valur plus y?

1236
01:00:03,360 --> 01:00:05,130
M'inix totalment ċert dak li jfisser.

1237
01:00:05,130 --> 01:00:10,582
>> UDJENZA: Allura passat tiegħek semi-anonima
funzjoni huwa somma hija ugwali għal dan

1238
01:00:10,582 --> 01:00:14,452
funzjoni anonima, hekk somma hija
issa varjabbli li inti can--

1239
01:00:14,452 --> 01:00:15,410
HANNAH Blumberg: Dritt.

1240
01:00:15,410 --> 01:00:18,980
Allura somma hija l-varjabbli,
imma hija actually--

1241
01:00:18,980 --> 01:00:23,770
hekk somma hija varjabbli li
valur hija l-funzjoni.

1242
01:00:23,770 --> 01:00:27,030
Għalhekk huwa funzjoni, li huwa tip ta '
ħaġa stramb biex nagħlaq ras tiegħek madwar

1243
01:00:27,030 --> 01:00:29,880
peress li aħna kont qed jilagħbu bil
C u inti ma tistax tagħmel dan fil C.

1244
01:00:29,880 --> 01:00:32,679
Imma issa nistgħu sejħa somma l
istess mod nistgħu sejħa somma hawn.

1245
01:00:32,679 --> 01:00:33,220
UDJENZA: OK.

1246
01:00:33,220 --> 01:00:33,970
HANNAH Blumberg: Yeah.

1247
01:00:33,970 --> 01:00:34,553
Tajba kwistjoni.

1248
01:00:34,553 --> 01:00:35,438
Yeah.

1249
01:00:35,438 --> 01:00:39,862
>> UDJENZA: Allura aħna ma jużawx l-
prototipi fil PHP jew JavaScript?

1250
01:00:39,862 --> 01:00:42,070
HANNAH Blumberg: Le, aħna
m'għandhomx bżonn li jużaw prototipi,

1251
01:00:42,070 --> 01:00:43,880
speċjalment fil JavaScript.

1252
01:00:43,880 --> 01:00:49,380
Ħaġa Allura wieħed prattika ħażina li jien
se ngħid li inti m'għandekx tagħmel

1253
01:00:49,380 --> 01:00:52,620
huwa inti ma għandekx jiktbu i var = 50.

1254
01:00:52,620 --> 01:00:54,840
Inti tista 'biss tibda tagħmel i = 50.

1255
01:00:54,840 --> 01:00:57,490
U se biss tagħmel i varjabbli globali.

1256
01:00:57,490 --> 01:01:00,550
>> Huwa prattika ħażina ħafna biex
qatt ma jgħidu i espliċitament var,

1257
01:01:00,550 --> 01:01:01,800
imma hija xi ħaġa li tista 'tagħmel.

1258
01:01:01,800 --> 01:01:03,591
L-interpretu mhux
ser Yell fi inti.

1259
01:01:03,591 --> 01:01:05,920
JavaScript huwa pjuttost simili,
inti tista 'tagħmel dak li trid.

1260
01:01:05,920 --> 01:01:09,301

1261
01:01:09,301 --> 01:01:09,800
Oh, sorry.

1262
01:01:09,800 --> 01:01:10,300
Hemm tnejn.

1263
01:01:10,300 --> 01:01:12,150
Fl-pants oranġjo.

1264
01:01:12,150 --> 01:01:13,190
Jimxi 'l quddiem.

1265
01:01:13,190 --> 01:01:14,390
>> UDJENZA: Le, inti tmur l-ewwel.

1266
01:01:14,390 --> 01:01:16,765
>> UDJENZA: Le, I kien biss qal
I ma kellhomx naħa tiegħi up.

1267
01:01:16,765 --> 01:01:20,248

1268
01:01:20,248 --> 01:01:20,748
KOLLOX SEW.

1269
01:01:20,748 --> 01:01:26,604
Mela jekk ġejt biex sejħa
li l-ewwel darba, issa qosor,

1270
01:01:26,604 --> 01:01:29,864
aħna sejħa hija l-istess mod, x,
y, bħal kull darba waħda?

1271
01:01:29,864 --> 01:01:30,780
HANNAH Blumberg: Yeah.

1272
01:01:30,780 --> 01:01:32,572
Allura dawn iż-żewġ essenzjalment
jagħmlu l-istess ħaġa.

1273
01:01:32,572 --> 01:01:35,113
UDJENZA: U x'inhu l-vantaġġ
ta 'użu ta' wieħed jew l-ieħor?

1274
01:01:35,113 --> 01:01:37,500
HANNAH Blumberg: ebda vantaġġ
ta 'użu ta' wieħed jew l-oħra.

1275
01:01:37,500 --> 01:01:40,080
I biss riedu biex turi li inti żewġ
biċċiet differenti ta 'sintassi.

1276
01:01:40,080 --> 01:01:42,770
Ħafna drabi fejn anonimi
funzjonijiet do jkollhom skop

1277
01:01:42,770 --> 01:01:48,220
hija jekk l-argument għall-ieħor
funzjoni għandha tkun funzjoni.

1278
01:01:48,220 --> 01:01:50,600
U aħna ser tara li fil
ftit tieni ma Ajax.

1279
01:01:50,600 --> 01:01:53,577
>> Mela jekk dan ma jagħmel ebda sens,
aħżen fid-dahar ta 'ras tiegħek.

1280
01:01:53,577 --> 01:01:55,660
Li meta l anonima
funzjoni tista 'tkun utli

1281
01:01:55,660 --> 01:01:58,284
għaliex mhuwiex verament jiswa
jtuha isem peress li aħna qed biss

1282
01:01:58,284 --> 01:01:59,443
se tużah darba.

1283
01:01:59,443 --> 01:02:00,370
Yeah.

1284
01:02:00,370 --> 01:02:03,635
>> UDJENZA: Jekk xuy bidla aktar tard
fuq, se tiġbor jinbidlu wkoll?

1285
01:02:03,635 --> 01:02:06,510
HANNAH Blumberg: Jekk x u l-bidla y
aktar tard, se tiġbor jinbidlu wkoll?

1286
01:02:06,510 --> 01:02:08,840
Allura dan huwa effettivament I
jaħsbu xi ħaġa li,

1287
01:02:08,840 --> 01:02:12,260
għal darb'oħra, hija biss iħoss differenti ħafna
minn C. Dan m'huwiex valur.

1288
01:02:12,260 --> 01:02:13,620
Mhuwiex 5.

1289
01:02:13,620 --> 01:02:15,550
Huwa biss il-funzjoni hija stess.

1290
01:02:15,550 --> 01:02:19,110
Allura hekk kif inti tagħti parametri,
allura inti ser fil-fatt jiġi kkalkolat valur.

1291
01:02:19,110 --> 01:02:21,193
>> MARIA ZLATKOVA: U mbagħad
inti tista 'sejħa l-funzjoni

1292
01:02:21,193 --> 01:02:23,272
u jużaha biex nikseb xi valur.

1293
01:02:23,272 --> 01:02:24,230
HANNAH Blumberg: Dritt.

1294
01:02:24,230 --> 01:02:25,250
Eżattament.

1295
01:02:25,250 --> 01:02:25,863
Yeah.

1296
01:02:25,863 --> 01:02:27,946
>> UDJENZA: Mela jekk inti biss
jaħżnuh fil-varjabbli,

1297
01:02:27,946 --> 01:02:31,430
bħal var x ugwali somma ta 'żewġ values--

1298
01:02:31,430 --> 01:02:32,420
>> HANNAH Blumberg: Yeah.

1299
01:02:32,420 --> 01:02:35,320
Allura inti tista 'biss tagħmel somma var
huwa ugwali somma ta 'żewġ valuri.

1300
01:02:35,320 --> 01:02:37,670
Yeah.

1301
01:02:37,670 --> 01:02:38,680
Kwalunkwe mistoqsijiet oħra?

1302
01:02:38,680 --> 01:02:39,642
Yeah.

1303
01:02:39,642 --> 01:02:42,047
>> UDJENZA: Iżda kieku dan
jikkonfondi somma u s-somma?

1304
01:02:42,047 --> 01:02:45,062
Bħal jekk inti sejħa somma varjabbli tiegħek,
kieku inti sejħa-somma funzjoni?

1305
01:02:45,062 --> 01:02:45,895
HANNAH Blumberg: Mm.

1306
01:02:45,895 --> 01:02:46,395
Mm.

1307
01:02:46,395 --> 01:02:51,253
Jekk inti għamilt xi ħaġa
simili, somma ugwali somma 2, 5?

1308
01:02:51,253 --> 01:02:53,170
>> UDJENZA: Yeah.

1309
01:02:53,170 --> 01:02:56,465
>> HANNAH Blumberg: Nemmen li
se jissostitwixxu l-valur tal somma.

1310
01:02:56,465 --> 01:02:59,290
Allura ieħor interessanti
ħaġa dwar JavaScript

1311
01:02:59,290 --> 01:03:02,950
hija li varjabbli waħda tista 'tieħu
fuq mazz ta 'tipi differenti.

1312
01:03:02,950 --> 01:03:03,790
Bad prattika.

1313
01:03:03,790 --> 01:03:06,280
Inti m'għandekx tagħmel xi ħaġa
bħal dak li inti biss qal.

1314
01:03:06,280 --> 01:03:10,240
>> Iżda fis-C, jekk i huwa stabbilit
ugwali għal integer,

1315
01:03:10,240 --> 01:03:13,570
nafu li qatt ma
ser issir string.

1316
01:03:13,570 --> 01:03:15,670
Dan mhuwiex il-każ fil-JavaScript.

1317
01:03:15,670 --> 01:03:17,770
Yeah, mistoqsija tajba.

1318
01:03:17,770 --> 01:03:20,151
Xi ħaġa oħra?

1319
01:03:20,151 --> 01:03:20,650
Kull dritt.

1320
01:03:20,650 --> 01:03:21,850
Jsir kull dritt fil-ħin.

1321
01:03:21,850 --> 01:03:23,050
Żamma għaddejjin.

1322
01:03:23,050 --> 01:03:25,200
Kull dritt.

1323
01:03:25,200 --> 01:03:27,780
>> Jekk inħarsu lejn firxa
fl JavaScript, hawn

1324
01:03:27,780 --> 01:03:30,250
eżempju ta 'malajr ta' firxa ta 'kordi.

1325
01:03:30,250 --> 01:03:31,967
U arrays jistgħu jikbru b'mod dinamiku.

1326
01:03:31,967 --> 01:03:33,675
Huma ma jkollhom
daqs fiss bl-istess mod

1327
01:03:33,675 --> 01:03:37,990
li jagħmlu fil C. Aħna jistgħu jaċċedu għall-
elementi li biss il-parentesi kwadri.

1328
01:03:37,990 --> 01:03:41,720
>> Li jistenna ħafna bħal PHP u ħafna
bħal C, fejn nistgħu ngħidu, f'dan il-każ,

1329
01:03:41,720 --> 01:03:48,360
jekk jien ridt l-kelma JavaScript, nixtieq
do arr parentesi kwadri bil-0, 1, 2.

1330
01:03:48,360 --> 01:03:51,450

1331
01:03:51,450 --> 01:03:55,390
U allura jekk inti tiftakar fil C meta aħna
riedu jiksbu t-tul ta 'firxa,

1332
01:03:55,390 --> 01:03:56,820
kien verament annoying.

1333
01:03:56,820 --> 01:03:58,460
Iżda fl JavaScript, super faċli.

1334
01:03:58,460 --> 01:03:59,910
Kollha għandna nagħmlu, .length.

1335
01:03:59,910 --> 01:04:01,120
Jagħtiha l tulijiet.

1336
01:04:01,120 --> 01:04:01,892
Daqshekk.

1337
01:04:01,892 --> 01:04:03,140
>> UDJENZA: Li sempliċi.

1338
01:04:03,140 --> 01:04:05,306
>> HANNAH Blumberg: Yeah, jagħmel
ħajja tiegħek ħafna aktar faċli.

1339
01:04:05,306 --> 01:04:08,950

1340
01:04:08,950 --> 01:04:11,560
OK, mhux object-- hemm.

1341
01:04:11,560 --> 01:04:15,480
Oġġetti fl JavaScript jħossu
ħafna bħall structs fis-C

1342
01:04:15,480 --> 01:04:18,280
u arrays assoċjattiva fis PHP.

1343
01:04:18,280 --> 01:04:20,270
Allura dak li aħna stajt tidher
Ħafna huwa JSON, li

1344
01:04:20,270 --> 01:04:23,150
stands għall JavaScript Notazzjoni Għan.

1345
01:04:23,150 --> 01:04:25,550
U huwa bażikament mezz
tad-istrutturar data tagħna.

1346
01:04:25,550 --> 01:04:27,880
>> Mela ejja ara eżempju,
probabbilment l-eħfef.

1347
01:04:27,880 --> 01:04:32,540
Allura hawnhekk eżempju ta 'oġġett
li taħżen il-klassi, CS50.

1348
01:04:32,540 --> 01:04:37,790
U meta ngħid klassi, I tfisser ovvjament,
mhux like-- yeah, il-kors, CS50.

1349
01:04:37,790 --> 01:04:40,730
U tkun taf tara li
kollox fl-oġġett

1350
01:04:40,730 --> 01:04:43,526
se tkun tinsab
fil braces kaboċċi.

1351
01:04:43,526 --> 01:04:48,260
>> U nibdew ismijiet qasam jassoċjaw
jew ċwievet mal-valuri differenti.

1352
01:04:48,260 --> 01:04:52,920
Allura inti tista 'tibda biex tara kif dan it-tip ta'
iħoss bħal firxa assoċjattiva fil-PHP.

1353
01:04:52,920 --> 01:04:57,450
Allura aħna qed tmur biex jassoċjaw-qasam jew
l-isem ewlenin, naturalment, ma 'l-string,

1354
01:04:57,450 --> 01:04:58,510
CS50.

1355
01:04:58,510 --> 01:04:59,940
>> Aħna ser ikollhom għalliem.

1356
01:04:59,940 --> 01:05:00,940
Aħna ser ikollhom TFS.

1357
01:05:00,940 --> 01:05:05,240
Aħna ser ikollhom numru ta 'psets
u aħna qed tmur biex rreġistraw.

1358
01:05:05,240 --> 01:05:10,720
U ħaġa waħda jibred li wieħed jinnota kollha
dawn l-affarijiet għandhom tipi differenti,

1359
01:05:10,720 --> 01:05:12,020
u li l-totalment multa.

1360
01:05:12,020 --> 01:05:15,330
>> Huwa tal-multa għal oġġett, fil-fatt,
huwa probabbilment mistenni għal oġġett

1361
01:05:15,330 --> 01:05:19,620
li jkollhom taħlita ta 'spag
u n-numri u Booleans u arrays

1362
01:05:19,620 --> 01:05:23,420
u kwalunkwe ħaġa oħra li tista '
tixtieq li jkollok ġewwa oġġett tiegħek.

1363
01:05:23,420 --> 01:05:28,570
U jinnota li dawn ser ikunu
l-ismijiet jew il-keys, u allura aħna biss

1364
01:05:28,570 --> 01:05:30,300
dan għandu jiġi ugwali b'żewġ punti ftit.

1365
01:05:30,300 --> 01:05:32,015
>> UDJENZA: X'inhuma eżattament ma JSON jfisser?

1366
01:05:32,015 --> 01:05:33,890
HANNAH Blumberg: What
eżattament ma JSON jfisser?

1367
01:05:33,890 --> 01:05:36,470
JSON biss stands għall
JavaScript Notazzjoni Għan.

1368
01:05:36,470 --> 01:05:38,430
Huwa biss mod ta 'ifformattjar.

1369
01:05:38,430 --> 01:05:40,040
Yeah.

1370
01:05:40,040 --> 01:05:41,800
Huwa mod ta 'ifformattjar data tagħna.

1371
01:05:41,800 --> 01:05:43,620
>> Fil C, huwa structs.

1372
01:05:43,620 --> 01:05:45,800
Fil PHP, huwa arrays assoċjattiva.

1373
01:05:45,800 --> 01:05:47,120
Fl JavaScript, għandna oġġetti.

1374
01:05:47,120 --> 01:05:48,969
>> UDJENZA: Allura CS50 s oġġett?

1375
01:05:48,969 --> 01:05:51,010
HANNAH Blumberg: CS50 hija
l-oġġett f'dan il-każ.

1376
01:05:51,010 --> 01:05:54,830

1377
01:05:54,830 --> 01:05:57,880
Issa, kif do we attwalment aċċess
F'dawk is-setturi jew bidla f'dawk l-oqsma.

1378
01:05:57,880 --> 01:06:03,920
Per eżempju, ejja ngħidu aħna iddeċieda li
int riedu wieħed inqas pset dan is-semestru.

1379
01:06:03,920 --> 01:06:06,300
Minflok disa ', aħna qed
biss se jkollhom tmien.

1380
01:06:06,300 --> 01:06:08,240
Kif nagħmlu l-bidla li?

1381
01:06:08,240 --> 01:06:09,436
>> Oh, mod żbaljat.

1382
01:06:09,436 --> 01:06:11,060
Hemm żewġ modi li nistgħu nagħmlu dan.

1383
01:06:11,060 --> 01:06:13,490
Numru wieħed huwa mal-dot
notazzjoni u numru tnejn

1384
01:06:13,490 --> 01:06:15,750
huwa bl-notazzjoni parentesi kwadri.

1385
01:06:15,750 --> 01:06:19,720
Għalhekk, per eżempju, jekk I
riedu bidla jew aċċess

1386
01:06:19,720 --> 01:06:26,820
qasam psets fil-għan CS50 tagħna,
dak li nixtieq nagħmel huwa CS50.psets,

1387
01:06:26,820 --> 01:06:30,770
hekk l-isem ta 'l-oġġett dot
l-isem tal-qasam jew ċ-ċavetta.

1388
01:06:30,770 --> 01:06:37,120
>> Ħafna bl-istess mod, huwa eżattament
ekwivalenti li tagħmel CS50, u mbagħad

1389
01:06:37,120 --> 01:06:42,050
fil ċingi kwadru, psets.

1390
01:06:42,050 --> 01:06:42,837
Kessaħ?

1391
01:06:42,837 --> 01:06:44,298
Yeah.

1392
01:06:44,298 --> 01:06:47,707
>> UDJENZA: Allura huwa JSON
teknikament JavaScript xorta,

1393
01:06:47,707 --> 01:06:51,814
anki jekk fil-psets aħna
separati out [inaudible]?

1394
01:06:51,814 --> 01:06:52,730
HANNAH Blumberg: Sure.

1395
01:06:52,730 --> 01:06:56,290
Għalhekk il-kwistjoni hija, huma
JavaScript u JSON ekwivalenti?

1396
01:06:56,290 --> 01:07:00,750
Allura JSON huwa notazzjoni, bażikament
il-mod li aħna jiktbu

1397
01:07:00,750 --> 01:07:02,700
oġġett minn JavaScript.

1398
01:07:02,700 --> 01:07:05,190
Allura dawn mhux qed eżattament l-istess.

1399
01:07:05,190 --> 01:07:08,950
>> Jien ngħid JavaScript, hemm
huma oġġetti fl JavaScript.

1400
01:07:08,950 --> 01:07:12,590
JSON jieħu dawk l-oġġetti u
stampi minnhom u turihom

1401
01:07:12,590 --> 01:07:15,160
jew imħażen tagħhom b'mod sabiħ.

1402
01:07:15,160 --> 01:07:18,110
Allura JSON mhix programmar
lingwa tal-mod li JavaScript huwa.

1403
01:07:18,110 --> 01:07:20,900
Huwa biss in-notazzjoni għall
oġġetti tagħna fl JavaScript.

1404
01:07:20,900 --> 01:07:21,400
Yeah.

1405
01:07:21,400 --> 01:07:24,144
>> UDJENZA: Allura x'inhi eżattament
[Inaudible] jitlesta?

1406
01:07:24,144 --> 01:07:25,060
HANNAH Blumberg: Sure.

1407
01:07:25,060 --> 01:07:27,727
Allura dan fil-fatt ma xejn.

1408
01:07:27,727 --> 01:07:28,935
Dan huwa biss mod għall-aċċess.

1409
01:07:28,935 --> 01:07:31,393
Mela ejja ngħidu aħna riedu bidla
in-numru ta 'settijiet problema

1410
01:07:31,393 --> 01:07:32,450
9-8.

1411
01:07:32,450 --> 01:07:34,383
Dak li nagħmlu huwa nagħmlu xi ħaġa
bħal CS50.psets = 8 ;.

1412
01:07:34,383 --> 01:07:38,500

1413
01:07:38,500 --> 01:07:39,400
>> Yeah, kwistjoni kbira.

1414
01:07:39,400 --> 01:07:40,733
Dan huwa biss biex nuruk sintassi.

1415
01:07:40,733 --> 01:07:43,620
Fatt ma tagħmel xejn utli.

1416
01:07:43,620 --> 01:07:46,085
Kwalunkwe mistoqsijiet?

1417
01:07:46,085 --> 01:07:48,210
Nimxu dritt flimkien.

1418
01:07:48,210 --> 01:07:51,960
>> Mela ejja nħarsu lejn eżempju ta 'malajr ta' kif
JavaScript xogħlijiet minħabba I qallek it

1419
01:07:51,960 --> 01:07:55,170
ma dawn l-affarijiet jibred u
jippermetti li timmodifika paġni tal-web.

1420
01:07:55,170 --> 01:07:56,970
Ejja attwalment tara li fl-azzjoni.

1421
01:07:56,970 --> 01:07:59,850
Sabiex jieħdu, per eżempju, dan il-fajl HTML.

1422
01:07:59,850 --> 01:08:04,350
>> U l-ħaġa nixtieq li tiffoka fuq hija
dan il-tikketta partikolari, li huwa buttuna,

1423
01:08:04,350 --> 01:08:06,182
ma search_button id.

1424
01:08:06,182 --> 01:08:08,670
Huwa biss fuq il-paġna.

1425
01:08:08,670 --> 01:08:10,690
Allura issa ejja ara dak
nistgħu attwalment jagħmlu.

1426
01:08:10,690 --> 01:08:12,560
>> Ukoll, ejja ngħidu meta
tikklikkja li buttuna,

1427
01:08:12,560 --> 01:08:16,010
irridu li jagħmlu alert--
inti għafast il-buttuna.

1428
01:08:16,010 --> 01:08:17,840
Ejja naraw kif nistgħu nagħmlu dan.

1429
01:08:17,840 --> 01:08:23,869
Allura window.onload-- din mhix xi ħaġa
li inti stajt tidher fil-klassi, għalhekk

1430
01:08:23,869 --> 01:08:26,180
mhux se jeħtieġu li jkunu jafu lilha għall-kwizz.

1431
01:08:26,180 --> 01:08:33,660
Iżda dan bażikament jgħid, OK, sejħa
Din il-funzjoni meta t-tagħbijiet tat-twieqi.

1432
01:08:33,660 --> 01:08:35,080
>> Allura dak biss tip ta 'kodiċi setup.

1433
01:08:35,080 --> 01:08:36,390
Tinkwetax tant dwar dan.

1434
01:08:36,390 --> 01:08:39,170
Dak li nixtieq li tiffoka fuq hija fil hawn.

1435
01:08:39,170 --> 01:08:44,020
Aħna ngħidu searchButton var ugwali
document.getElementByID search_button.

1436
01:08:44,020 --> 01:08:46,450
>> Allura kif inti tista raden,
X'inhu dan ma huwa jgħid,

1437
01:08:46,450 --> 01:08:50,920
OK, mur isibu l-element
ma search_button ID.

1438
01:08:50,920 --> 01:08:52,790
U issa għandna li
element attwali u jien

1439
01:08:52,790 --> 01:08:56,279
se jaħżnu
searchButton varjabbli.

1440
01:08:56,279 --> 01:09:00,651
U issa nistgħu attwalment jużaw dan l-element
u l-bidla, jew aċċess valuri tagħha,

1441
01:09:00,651 --> 01:09:01,359
affarijiet bħal dik.

1442
01:09:01,359 --> 01:09:04,649
Nistgħu ngħidu jibdew
timpenja ruħha mal-paġna tal-web.

1443
01:09:04,649 --> 01:09:10,330
>> So here I say, OK, issa li għandi
li buttuna, meta huwa għafast,

1444
01:09:10,330 --> 01:09:12,859
sejħa din il-funzjoni anonima.

1445
01:09:12,859 --> 01:09:16,811
Allura dan huwa fejn anonima
funzjonijiet jsiru utli.

1446
01:09:16,811 --> 01:09:18,060
U dak ma l-funzjoni do?

1447
01:09:18,060 --> 01:09:20,529
Ukoll, huwa biss jitlob dan
funzjoni ta 'twissija u jgħid,

1448
01:09:20,529 --> 01:09:22,910
inti għafast il-buttuna Search.

1449
01:09:22,910 --> 01:09:29,670
>> Allura x'se jiġri jekk immur fejn
dan HTML tgħix u I ikklikkja l-buttuna,

1450
01:09:29,670 --> 01:09:33,729
I ser tingħata twissija ftit fancy
li tgħid li inti għafast il-buttuna.

1451
01:09:33,729 --> 01:09:40,710
Allura l-affarijiet li jiffokaw fuq
here-- document.getElementByID

1452
01:09:40,710 --> 01:09:44,960
gets HTML partikolari
element bl-ID partikolari.

1453
01:09:44,960 --> 01:09:48,529
U issa nistgħu stabbilit
dak li għandu jiġri meta

1454
01:09:48,529 --> 01:09:50,702
dak l-element partikolari huwa għafast.

1455
01:09:50,702 --> 01:09:52,670
>> UDJENZA: Irridu tpoġġi kollha ta 'dak fil-?

1456
01:09:52,670 --> 01:09:53,162
>> HANNAH Blumberg: Jiddispjacini?

1457
01:09:53,162 --> 01:09:55,130
>> UDJENZA: Do irridu
fiżikament kodiċi kollha ta 'dak?

1458
01:09:55,130 --> 01:09:56,340
>> HANNAH Blumberg: Do irridu
fiżikament kodiċi kollha ta 'dak?

1459
01:09:56,340 --> 01:09:56,839
Iva.

1460
01:09:56,839 --> 01:09:58,120
Huwa ma 'dan it-tip ta' annoying?

1461
01:09:58,120 --> 01:10:00,032
Dan huwa ħafna ta 'kodiċi.

1462
01:10:00,032 --> 01:10:01,574
>> UDJENZA: Inti tista 'timporta xi ħaġa.

1463
01:10:01,574 --> 01:10:02,532
HANNAH Blumberg: Dritt.

1464
01:10:02,532 --> 01:10:03,610
Aħna jistgħu jużaw xi ħaġa.

1465
01:10:03,610 --> 01:10:08,140
U fl particular-- oh, huwa
javżak me I għandhom jgħallmu taqsima.

1466
01:10:08,140 --> 01:10:11,061
B'mod partikolari, ejja
jużaw il-librerija jQuery,

1467
01:10:11,061 --> 01:10:13,060
minħabba li kien verament
twil u verament annoying

1468
01:10:13,060 --> 01:10:16,860
u nixtieq li tkun tista tiġi simplifikata
u jagħmilha iqsar u eħfef biex jiktbu.

1469
01:10:16,860 --> 01:10:19,810
>> Allura jQuery hija librerija JavaScript.

1470
01:10:19,810 --> 01:10:24,930
Allura JavaScript huwa programmazzjoni
lingwa; jQuery hija librerija.

1471
01:10:24,930 --> 01:10:27,190
U jagħmel mazz ta 'affarijiet eħfef.

1472
01:10:27,190 --> 01:10:33,230
Jagħmel jinbidlu u li jmorru madwar
dokument HTML ferm aktar faċli.

1473
01:10:33,230 --> 01:10:35,030
>> Jagħmel avvenimenti tqandil aktar faċli.

1474
01:10:35,030 --> 01:10:37,580
Jagħmel animazzjoni aktar faċli
u jagħmel Ajax aktar faċli.

1475
01:10:37,580 --> 01:10:40,140
Mela ejja Mur fis tnejn
dawk l-affarijiet dritt issa.

1476
01:10:40,140 --> 01:10:40,900
Skużani.

1477
01:10:40,900 --> 01:10:42,620
Qabel nagħmlu, xi sintassi bażiku.

1478
01:10:42,620 --> 01:10:46,870
>> Dan huwa dak li ħafna sejħiet għall
il-librerija jQuery look like.

1479
01:10:46,870 --> 01:10:50,520
Aħna nużaw dan dollaru sign--
ebda sinjal konnessjoni ma PHP,

1480
01:10:50,520 --> 01:10:56,030
biss inconvenient---isem ta '
selettur, dot, u mbagħad azzjoni.

1481
01:10:56,030 --> 01:10:58,860
Mela ejja tara xi
eżempji konkreti ta 'dak.

1482
01:10:58,860 --> 01:11:02,980
>> Allura dan fil-fatt huwa l-istess
kodiċi mill-avveniment slide.

1483
01:11:02,980 --> 01:11:08,740
Allura dan twil, ħaġa ikrah isir
dan ħafna nicer, ħaġa iżgħar.

1484
01:11:08,740 --> 01:11:10,370
Mela ejja jippruvaw li din tinqasam.

1485
01:11:10,370 --> 01:11:17,090
Dan jgħid, OK, jQuery-- dan dollaru
sign-- jQuery, isibu me-tieqa.

1486
01:11:17,090 --> 01:11:18,480
Allura dak is-selettur.

1487
01:11:18,480 --> 01:11:21,800
>> Meta tagħbijiet, sejħa din il-funzjoni.

1488
01:11:21,800 --> 01:11:23,880
Allura dak kollox ġewwa.

1489
01:11:23,880 --> 01:11:24,380
KOLLOX SEW.

1490
01:11:24,380 --> 01:11:25,740
S'issa, hekk tajjeb?

1491
01:11:25,740 --> 01:11:26,750
Kull dritt.

1492
01:11:26,750 --> 01:11:32,970
>> Issa, jQuery, issib lili il
ħaġa ma search_button ID.

1493
01:11:32,970 --> 01:11:36,090
U dak li huwa għafast,
sejħa din il-funzjoni.

1494
01:11:36,090 --> 01:11:37,900
U allura dan l-funzjoni
eżattament l-istess.

1495
01:11:37,900 --> 01:11:41,052
Just jagħmlu daqsxejn ftit ta 'allert,
inti għafast il-buttuna Search.

1496
01:11:41,052 --> 01:11:42,650
>> Allura huwa verament sbieħ.

1497
01:11:42,650 --> 01:11:46,260
Huwa verament jikkondensa u
tissimplifika kodiċi tagħna.

1498
01:11:46,260 --> 01:11:49,030
Kif ma naf li
huwa search_button ID

1499
01:11:49,030 --> 01:11:50,960
u mhux bħal klassi search_button?

1500
01:11:50,960 --> 01:11:52,024
>> UDJENZA: hashtag?

1501
01:11:52,024 --> 01:11:52,940
HANNAH Blumberg: Yeah.

1502
01:11:52,940 --> 01:11:56,450
Dan is-simbolu hash, huwa bħad CSS.

1503
01:11:56,450 --> 01:12:00,080
Mela ftakar, ma CSS, meta aħna
riedu li tagħżel xi ħaġa mill-identità,

1504
01:12:00,080 --> 01:12:01,590
użajna s-sinjal lira.

1505
01:12:01,590 --> 01:12:05,400
U meta ridna li tagħżel
xi ħaġa minn klassi, aħna nużaw l-dot.

1506
01:12:05,400 --> 01:12:06,870
Great.

1507
01:12:06,870 --> 01:12:08,230
Jagħmel sens?

1508
01:12:08,230 --> 01:12:11,500
Allura jQuery suppost
biss tagħmel il-ħajja tagħna iktar faċli.

1509
01:12:11,500 --> 01:12:12,000
Yeah.

1510
01:12:12,000 --> 01:12:15,660
>> UDJENZA: Allura jien ftit konfuża
kif il-funzjoni anonimu xogħlijiet.

1511
01:12:15,660 --> 01:12:19,027
Do inti isem dan anonymouse
, il-funzjoni funzjoni?

1512
01:12:19,027 --> 01:12:20,594
Kif huwa msejjaħ?

1513
01:12:20,594 --> 01:12:21,510
HANNAH Blumberg: Sure.

1514
01:12:21,510 --> 01:12:25,812
Allura funzjoni huwa biss keyword li
jgħid, jien waslet biex jiddefinixxu funzjoni.

1515
01:12:25,812 --> 01:12:26,520
UDJENZA: Oh, OK.

1516
01:12:26,520 --> 01:12:27,353
HANNAH Blumberg: OK?

1517
01:12:27,353 --> 01:12:32,120
U allura aħna tgħaddiha bħala
argument to-- ejja tagħti

1518
01:12:32,120 --> 01:12:37,040
dan one-- ġewwa għall-funzjoni klikk.

1519
01:12:37,040 --> 01:12:39,420
Allura yeah, b'tali mod li funzjoni,
din il-funzjoni anonima,

1520
01:12:39,420 --> 01:12:40,910
isir argument attwali.

1521
01:12:40,910 --> 01:12:43,632
Mela ftakar fil JavaScript, aħna
jista 'jikkura funzjonijiet bħala valuri.

1522
01:12:43,632 --> 01:12:44,340
UDJENZA: Oh, OK.

1523
01:12:44,340 --> 01:12:45,256
HANNAH Blumberg: Yeah.

1524
01:12:45,256 --> 01:12:46,035
I simili li "oh."

1525
01:12:46,035 --> 01:12:47,490
Nizza.

1526
01:12:47,490 --> 01:12:49,915
Mistoqsijiet oħra?

1527
01:12:49,915 --> 01:12:50,505
Ħin?

1528
01:12:50,505 --> 01:12:51,380
MARIA ZLATKOVA: Tajba.

1529
01:12:51,380 --> 01:12:52,760
Tajba.

1530
01:12:52,760 --> 01:12:54,210
>> HANNAH Blumberg: biża.

1531
01:12:54,210 --> 01:12:55,720
Xi jQuery utli malajr.

1532
01:12:55,720 --> 01:12:57,559
Jien mhux se jmorru
kollha permezz ta 'dawn.

1533
01:12:57,559 --> 01:12:59,350
Dawn slides se jkunu
up online ftit

1534
01:12:59,350 --> 01:13:02,040
aktar tard, sabiex inti tista 'tivverifika
it out ftit aktar tard.

1535
01:13:02,040 --> 01:13:07,120
Imma bażikament, il ġenerali
mudell istivi fejn nistgħu ngħidu,

1536
01:13:07,120 --> 01:13:11,510
OK, ħej, jQuery, hawnhekk tiegħi
selettur u mbagħad hawnhekk azzjoni.

1537
01:13:11,510 --> 01:13:15,940
U inti tista 'tagħmel affarijiet simili aċċess l
valur ta 'formola, aċċess xi HTML,

1538
01:13:15,940 --> 01:13:19,195
kontroll x'jiġri meta l-utent
tissottometti formola, affarijiet bħal dik.

1539
01:13:19,195 --> 01:13:20,106
Iva.

1540
01:13:20,106 --> 01:13:22,090
>> UDJENZA: Allura fil-
eżami, aħna qed tmur għall-ħtieġa

1541
01:13:22,090 --> 01:13:25,066
tkun taf pjuttost ħafna minn
id-dokumentazzjoni jQuery.

1542
01:13:25,066 --> 01:13:31,018
Allura peress li aħna kopja / paste tal-jQuery
dokumentazzjoni li iqarrqu folja tagħna,

1543
01:13:31,018 --> 01:13:32,506
Fejn hi l-linja miġbuda?

1544
01:13:32,506 --> 01:13:33,957
Bħal kemm għandna bżonn inkunu nafu?

1545
01:13:33,957 --> 01:13:35,290
HANNAH Blumberg: mistoqsija Great.

1546
01:13:35,290 --> 01:13:37,765
Il-kwistjoni hija
essenzjalment minħabba li inti

1547
01:13:37,765 --> 01:13:41,330
ma jistgħux jaċċessaw id-dokumentazzjoni jQuery
matul it-test, kemm jekk inti

1548
01:13:41,330 --> 01:13:41,830
jafu?

1549
01:13:41,830 --> 01:13:45,540
Aħna ma jistennewx biex tiġu
up ma 'xi funzjoni każwali

1550
01:13:45,540 --> 01:13:47,240
li aħna se jistennew li inti Google.

1551
01:13:47,240 --> 01:13:52,930
>> Affarijiet li huma ġusti logħba huma nixtieq
jgħidu biss tip ta 'l-sintassi ġenerali,

1552
01:13:52,930 --> 01:13:58,310
jkunu jistgħu jagħżlu minn ID u
billi class-- hekk bħad CSS.

1553
01:13:58,310 --> 01:14:01,876
U allura l-funzjonijiet attwali
themself, aħna ser x'aktarx jgħidlek.

1554
01:14:01,876 --> 01:14:02,376
Yeah.

1555
01:14:02,376 --> 01:14:05,591
>> UDJENZA: Allura meta inti tagħżel
skond il-klassi tkun tfisser dot.

1556
01:14:05,591 --> 01:14:06,840
HANNAH Blumberg: Iva, eżattament.

1557
01:14:06,840 --> 01:14:07,340
Tajba.

1558
01:14:07,340 --> 01:14:10,461
Meta inti tagħżel skont il-klassi, li għaddej
li jiġu dot minflok tas-sinjal lira.

1559
01:14:10,461 --> 01:14:10,960
Iva.

1560
01:14:10,960 --> 01:14:12,710
>> UDJENZA: Would you
jmorru fuq id-differenza

1561
01:14:12,710 --> 01:14:14,310
bejn għażla mill ID u skond il-klassi?

1562
01:14:14,310 --> 01:14:14,560
>> HANNAH Blumberg: Sure.

1563
01:14:14,560 --> 01:14:17,510
Id-differenza bejn għażla
ID u l-għażla skond il-klassi.

1564
01:14:17,510 --> 01:14:20,685
Sabiex Maria qal
ftit qabel, hemm

1565
01:14:20,685 --> 01:14:26,280
tista 'tkun biss element HTML wieħed
b'ID partikolari, billi klassi,

1566
01:14:26,280 --> 01:14:29,740
dan jippermetti li grupp mazz
Elementi ta 'differenti flimkien,

1567
01:14:29,740 --> 01:14:34,300
sabiex l-affarijiet li huma relatati,
iżda mhux eżattament l-istess.

1568
01:14:34,300 --> 01:14:35,685
Does li risposta għad-domanda?

1569
01:14:35,685 --> 01:14:36,200
Tal-biża.

1570
01:14:36,200 --> 01:14:37,194
Iva.

1571
01:14:37,194 --> 01:14:40,680
>> UDJENZA: X'jiġri jekk għandek multipli
affarijiet li huma fl-istess klassi?

1572
01:14:40,680 --> 01:14:42,150
>> HANNAH Blumberg: X'jiġri
jekk għandek affarijiet multipli li

1573
01:14:42,150 --> 01:14:43,280
huma l-istess klassi?

1574
01:14:43,280 --> 01:14:45,829
Għalhekk, per eżempju, jekk aħna qed
biss bl-użu pur JavaScript,

1575
01:14:45,829 --> 01:14:48,120
aħna se nagħmlu xi ħaġa bħal
document.getElementsByClass.

1576
01:14:48,120 --> 01:14:52,280

1577
01:14:52,280 --> 01:14:56,320
U allura dak li attwalment ma
huwa prospetti firxa ta 'elementi.

1578
01:14:56,320 --> 01:14:59,517
>> U inti għandek jew jtenni fuq
minnhom jew isibu liema waħda tixtieq.

1579
01:14:59,517 --> 01:15:01,350
Mhuwiex ser jagħti
inti element wieħed.

1580
01:15:01,350 --> 01:15:03,450
Li għaddej biex jagħtuk
firxa ta 'elementi.

1581
01:15:03,450 --> 01:15:05,280
Kwistjoni kbira.

1582
01:15:05,280 --> 01:15:07,700
Xi ħaġa oħra?

1583
01:15:07,700 --> 01:15:09,520
Tal-biża.

1584
01:15:09,520 --> 01:15:12,860
>> So I think jekk int familjari ma
kwalunkwe jQuery inti raw fil-pset,

1585
01:15:12,860 --> 01:15:15,600
inti għandek tkun tajba biex tmur.

1586
01:15:15,600 --> 01:15:16,325
Mistoqsija?

1587
01:15:16,325 --> 01:15:17,610
Oh, no.

1588
01:15:17,610 --> 01:15:18,859
I really jkollhom biex jgħallmu.

1589
01:15:18,859 --> 01:15:19,358
Jirrilassaw.

1590
01:15:19,358 --> 01:15:20,035
Hija ser tkun multa.

1591
01:15:20,035 --> 01:15:20,660
I ser naslu s'hemm.

1592
01:15:20,660 --> 01:15:24,670

1593
01:15:24,670 --> 01:15:26,870
>> Ejja nitkellmu dwar Ajax.

1594
01:15:26,870 --> 01:15:31,350
Allura Ajax se tkun a-- sew,
Nibdew bl xi tfisser.

1595
01:15:31,350 --> 01:15:32,350
Huwa ta 'akronimu.

1596
01:15:32,350 --> 01:15:35,855
Hija tirrappreżenta Asynchronous
JavaScript u XML.

1597
01:15:35,855 --> 01:15:39,800
U XML hija bażikament se tkun
[Inaudible] ma 'tip ta' data tagħna.

1598
01:15:39,800 --> 01:15:42,100
Iżda aħna ma attwalment użati XML.

1599
01:15:42,100 --> 01:15:43,430
Minflok, aħna biss użu JSON.

1600
01:15:43,430 --> 01:15:48,350
>> Allura bażikament, huwa xi data--
mhux sinkroniku, JavaScript, u ​​data,

1601
01:15:48,350 --> 01:15:50,040
f'dan il-każ, JSON.

1602
01:15:50,040 --> 01:15:52,820
U l-għan tagħna, kif aħna imsemmi
ftit qabel,

1603
01:15:52,820 --> 01:15:56,880
huwa li tkun tista 'tagħmel
talba, għandhom dik it-talba ma

1604
01:15:56,880 --> 01:16:00,700
ħaġa tagħha fil-
isfond, iżda tkompli

1605
01:16:00,700 --> 01:16:02,550
jagħmlu dak kollu konna intenzjoni li jagħmlu.

1606
01:16:02,550 --> 01:16:06,650
U mbagħad meta l-informazzjoni tkun
lest, allura aħna ser tiġi inkorporata.

1607
01:16:06,650 --> 01:16:08,470
>> Mela ejja ara dak li dan
attwalment tidher qiesha.

1608
01:16:08,470 --> 01:16:11,210
U dan, inti għandek tkun
ftit familjari

1609
01:16:11,210 --> 01:16:13,680
mill pset8, l-waħda inti biss kellu.

1610
01:16:13,680 --> 01:16:16,200
Allura hawnhekk a jQuery valida
funzjoni li aħna jista

1611
01:16:16,200 --> 01:16:18,250
trid tkun taf about-- dan is-sinjal dollaru.

1612
01:16:18,250 --> 01:16:21,500
Għalhekk jgħid funzjoni jQuery, .getJson.

1613
01:16:21,500 --> 01:16:25,020
>> U dak din il-funzjoni ma huwa
tieħu URL u xi parameters--

1614
01:16:25,020 --> 01:16:28,000
hekk naħseb fil-każ
tal pset8, kien simili,

1615
01:16:28,000 --> 01:16:33,520
il-URL kienet articles.php u l
parametri kien go = xi kodiċi postali.

1616
01:16:33,520 --> 01:16:41,580
U jgħid, OK, jagħmel talba lill
dan il-URL mal-parametri stabbiliti.

1617
01:16:41,580 --> 01:16:43,480
U li jiġri biss.

1618
01:16:43,480 --> 01:16:47,730
>> Meta jispiċċa, huwa jew
se jtemmu b'suċċess

1619
01:16:47,730 --> 01:16:49,370
jew li għaddej biex jonqsu.

1620
01:16:49,370 --> 01:16:53,480
Allura dan huwa l-ekwivalenti ta 'sejħa
Rob u jitolbuh biex jagħmel xi ħaġa.

1621
01:16:53,480 --> 01:17:00,260
U allura meta huwa jitlob lura, hu jew
ser tg jien jsir jew I fallew.

1622
01:17:00,260 --> 01:17:04,030
>> Allura fil-każ fejn int
jsir, inti tgħidli, OK, jien jsir.

1623
01:17:04,030 --> 01:17:05,980
U allura inti sejħa din il-funzjoni.

1624
01:17:05,980 --> 01:17:08,915
F'dan il-każ, li għaddej biex tkun
funzjoni li jieħu xi informazzjoni.

1625
01:17:08,915 --> 01:17:12,890
Il-waħda aħna normalment care about hija data,
id-data li konna attwalment lura

1626
01:17:12,890 --> 01:17:15,900
bħala riżultat ta 'sejħa .getJSON.

1627
01:17:15,900 --> 01:17:17,470
>> U inti tista 'tagħmel xi ħaġa ma' dan.

1628
01:17:17,470 --> 01:17:23,670
Allura fil-każ ta 'pset8,
aħna murija bħala lista.

1629
01:17:23,670 --> 01:17:29,050
Fail se tkun funzjoni
li jintuża jekk it-talba jonqos

1630
01:17:29,050 --> 01:17:30,450
għal kwalunkwe raġuni.

1631
01:17:30,450 --> 01:17:35,104
U fil-każ ta 'pset8,
aħna biss console.log dan.

1632
01:17:35,104 --> 01:17:36,020
Kwalunkwe mistoqsijiet dwar dak?

1633
01:17:36,020 --> 01:17:36,300
Yeah.

1634
01:17:36,300 --> 01:17:39,633
>> UDJENZA: Nistgħu biss tuża theta funzjoni
minflok funzjoni, textStatus, jqHXR.

1635
01:17:39,633 --> 01:17:43,464

1636
01:17:43,464 --> 01:17:44,380
HANNAH Blumberg: Sure.

1637
01:17:44,380 --> 01:17:46,713
So yeah, I think fil-pset,
aħna biss raw data funzjoni.

1638
01:17:46,713 --> 01:17:48,700
Allura huwa biss the-- iva, OK.

1639
01:17:48,700 --> 01:17:50,510
Dak hu li rajna fil-pset.

1640
01:17:50,510 --> 01:17:51,480
C'est totalment multa.

1641
01:17:51,480 --> 01:17:54,210
>> Dawn huma biss jekk int riedu
biex tiġbed aktar informazzjoni,

1642
01:17:54,210 --> 01:17:57,190
dawn huma l-affarijiet li
inti tista 'tikseb minn .getJSON.

1643
01:17:57,190 --> 01:17:59,040
Tajba kwistjoni.

1644
01:17:59,040 --> 01:17:59,706
Xi ħaġa oħra?

1645
01:17:59,706 --> 01:18:00,206
Yeah.

1646
01:18:00,206 --> 01:18:01,787
>> UDJENZA: Allura .getJSON huwa Ajax?

1647
01:18:01,787 --> 01:18:02,620
HANNAH Blumberg: OK.

1648
01:18:02,620 --> 01:18:05,700
Allura dan hu t-tip ta 'parti delikata.

1649
01:18:05,700 --> 01:18:12,390
Hija funzjoni jQuery li tippermetti
inti tagħmel sejħiet mhux sinkroniku.

1650
01:18:12,390 --> 01:18:16,080
U dawk is-sejħiet mhux sinkroniku, li
dak li aħna kont qed jirreferu għalih bħala Ajax.

1651
01:18:16,080 --> 01:18:16,850
Yeah.

1652
01:18:16,850 --> 01:18:20,185
Li ħa me żmien twil verament biex
pull bogħod minn xulxin meta I kien student.

1653
01:18:20,185 --> 01:18:21,560
UDJENZA: Tista 'tgħid li għal darb'oħra?

1654
01:18:21,560 --> 01:18:22,476
HANNAH Blumberg: Yeah.

1655
01:18:22,476 --> 01:18:23,630
Nista 'ngħid li għal darb'oħra?

1656
01:18:23,630 --> 01:18:29,010
Din il-funzjoni .getJSON,
huwa funzjoni jQuery.

1657
01:18:29,010 --> 01:18:31,970
U li għaddej biex jagħmlu
sejħa mhux sinkroniku.

1658
01:18:31,970 --> 01:18:35,700
U dawn is-sejħiet mhux sinkroniku, konna
ġie jirreferu għal dawk kif Ajax.

1659
01:18:35,700 --> 01:18:39,610

1660
01:18:39,610 --> 01:18:41,872
>> Kwalunkwe mistoqsijiet oħra?

1661
01:18:41,872 --> 01:18:43,330
Għandna ftit minuti koppja xellug.

1662
01:18:43,330 --> 01:18:45,080
U Maria għaddej biex
nagħlaq mas-sigurtà

1663
01:18:45,080 --> 01:18:47,464
u allura aħna qed tmur
li jiġu biss dwar jsir.

1664
01:18:47,464 --> 01:18:48,630
MARIA ZLATKOVA: biża, OK.

1665
01:18:48,630 --> 01:18:54,030
Allura dan is-- ħu ftit
ta 'sekonda li tħares fuq dan.

1666
01:18:54,030 --> 01:18:56,750
U dan mhux xi ħaġa verament kbir.

1667
01:18:56,750 --> 01:18:59,430
U jista 'xi ħadd tell me għaliex?

1668
01:18:59,430 --> 01:19:05,650
Dak li qed jiġri fil-foo u tista jista
potenzjalment jirriżultaw xi ħaġa ħażina,

1669
01:19:05,650 --> 01:19:06,770
u dak li sejjaħ?

1670
01:19:06,770 --> 01:19:07,270
Yeah.

1671
01:19:07,270 --> 01:19:10,391
UDJENZA: Jekk l-argument li l-
għadda fil hija aktar minn 12 karattru,

1672
01:19:10,391 --> 01:19:11,454
jista overflow.

1673
01:19:11,454 --> 01:19:12,370
MARIA ZLATKOVA: Dritt.

1674
01:19:12,370 --> 01:19:14,180
Perfect.

1675
01:19:14,180 --> 01:19:15,384
X'inhu msejjaħ?

1676
01:19:15,384 --> 01:19:16,300
Inti biss imsemmija fiha.

1677
01:19:16,300 --> 01:19:16,840
>> UDJENZA: overflow buffer.

1678
01:19:16,840 --> 01:19:18,381
>> MARIA ZLATKOVA: Yup, buffer overflow.

1679
01:19:18,381 --> 01:19:21,230
Allura din hija xi ħaġa li aħna
jirreferu għalih bħala overflow buffer.

1680
01:19:21,230 --> 01:19:25,500
U naraw li ġewwa tal foo,
konna definit buffer tagħna, c,

1681
01:19:25,500 --> 01:19:27,240
b'daqs ta '12.

1682
01:19:27,240 --> 01:19:32,680
Madankollu, fil-prinċipali, aħna ma
check b'xi mod possibbli

1683
01:19:32,680 --> 01:19:36,480
jekk il-argv1-- sabiex
kien it-tieni argument.

1684
01:19:36,480 --> 01:19:39,630
Aħna ma tivverifika jekk il-
daqs ta 'dan huwa xieraq.

1685
01:19:39,630 --> 01:19:43,380
>> Hekk jekk kellna
utent speċjalment malizzjużi

1686
01:19:43,380 --> 01:19:47,170
li jitqiegħdu f'xi argument li kien
itwal minn 12, u mbagħad potenzjalment

1687
01:19:47,170 --> 01:19:50,850
lil hinn mill-limiti ta 'dak
argument, kellhom xi kodiċi esegwit

1688
01:19:50,850 --> 01:19:55,570
li hu kien qed jipprova jagħmel xi ħaġa ħażina
magħha; allura dan, dak li jiġri,

1689
01:19:55,570 --> 01:19:59,310
tirkibx-ritorn
indirizz tal-funzjoni foo,

1690
01:19:59,310 --> 01:20:04,370
jikkawżaw l-funzjoni meta
jirritornaw biex tesegwixxi dik kodiċi.

1691
01:20:04,370 --> 01:20:07,540
U imbagħad l-affarijiet ħżiena jista 'jiġri.

1692
01:20:07,540 --> 01:20:09,850
Does this jagħmel sens għal kulħadd?

1693
01:20:09,850 --> 01:20:12,424
>> U kif nistgħu jipproteġu kontra dan?

1694
01:20:12,424 --> 01:20:13,090
Għandek xi suġġerimenti?

1695
01:20:13,090 --> 01:20:16,480

1696
01:20:16,480 --> 01:20:21,890
Bażikament, ġewwa ta '
potenzjalment foo, kif

1697
01:20:21,890 --> 01:20:28,294
nistgħu jivverifika sabiex ikun żgur
li dan ma jista 'jiġri?

1698
01:20:28,294 --> 01:20:33,879
>> UDJENZA: Jekk id-daqs 12 jinqabeż,
inti jalloka memorja addizzjonali?

1699
01:20:33,879 --> 01:20:37,170
MARIA ZLATKOVA: Suġġeriment hija, jallokaw
memorja addizzjonali tad-daqs jinqabeż.

1700
01:20:37,170 --> 01:20:39,800
Fil-fatt, nistgħu nagħmlu xi ħaġa
ħafna aktar sempliċi minn dak ukoll.

1701
01:20:39,800 --> 01:20:44,870
Nistgħu biss tikseb it-tul string
tal-argument li tiddaħħal,

1702
01:20:44,870 --> 01:20:48,590
tivverifika jekk dak hu inqas
minn jew ugwali għal 12--

1703
01:20:48,590 --> 01:20:50,790
li huwa dak li rridu li
li jkun għaliex aħna ma rridux

1704
01:20:50,790 --> 01:20:52,373
lill hinn mil-limiti ta 'buffer tagħna.

1705
01:20:52,373 --> 01:20:55,690
U mbagħad jekk ma jiġrix dan, aħna
jistgħu jaħdmu ma 'l-argument.

1706
01:20:55,690 --> 01:21:00,296
U allura jekk dan huwa minnu, aħna fil-fatt tixtieq
li Yello potenzjalment fir-utent.

1707
01:21:00,296 --> 01:21:01,670
Iżda dan huwa kif aħna se nagħmlu dan.

1708
01:21:01,670 --> 01:21:02,443
Iva.

1709
01:21:02,443 --> 01:21:04,360
>> UDJENZA: Jista inti
jispjegaw reali malajr memcpy?

1710
01:21:04,360 --> 01:21:05,443
MARIA ZLATKOVA: Oh, sorry.

1711
01:21:05,443 --> 01:21:06,040
Iva.

1712
01:21:06,040 --> 01:21:11,290
Memcpy jieħu x'ikun is-- sorry, OK.

1713
01:21:11,290 --> 01:21:15,850
Memcpy jieħu dak kollu li huwa
fil bar, dak kollu li huwa mgħoddi

1714
01:21:15,850 --> 01:21:18,050
fuq foo bħala l-argument kmand tal-linja.

1715
01:21:18,050 --> 01:21:19,440
Allura li għaddej biex tieħu argv1.

1716
01:21:19,440 --> 01:21:21,420
Argv1 tissejjaħ bar hawn.

1717
01:21:21,420 --> 01:21:24,453
Allura li għaddej biex tieħu bar u
li għaddej biex jibagħtu kopja tagħha fis c.

1718
01:21:24,453 --> 01:21:25,402
>> UDJENZA: OK.

1719
01:21:25,402 --> 01:21:28,360
MARIA ZLATKOVA: U li għaddej biex
copy---tielet argument jirreferi biss

1720
01:21:28,360 --> 01:21:30,601
li kemm li għaddej biex kopja fis c.

1721
01:21:30,601 --> 01:21:31,142
UDJENZA: Ah.

1722
01:21:31,142 --> 01:21:33,030
Allura ikkupjar dan wieħed kollha ta 'dan imbagħad.

1723
01:21:33,030 --> 01:21:34,310
>> MARIA ZLATKOVA: Yeah,
huwa ikkupjar kollha ta 'dan.

1724
01:21:34,310 --> 01:21:34,810
Yep.

1725
01:21:34,810 --> 01:21:38,400

1726
01:21:38,400 --> 01:21:41,910
L-ewwel, irridu niżguraw l-bar ma jkunx
daqs null għaliex dan huwa pointer.

1727
01:21:41,910 --> 01:21:44,680
Imbagħad irridu jiksbu t-tul sensiela ta 'bar.

1728
01:21:44,680 --> 01:21:47,530
Għandna niżguraw li huwa
inqas minn jew ugwali għal 12.

1729
01:21:47,530 --> 01:21:50,070
U allura għaliex konna
għamel żgur, nistgħu attwalment

1730
01:21:50,070 --> 01:21:53,122
memcpy u kun żgur li dan huwa OK.

1731
01:21:53,122 --> 01:21:53,705
Kwalunkwe mistoqsijiet?

1732
01:21:53,705 --> 01:21:56,280

1733
01:21:56,280 --> 01:21:58,690
Great.

1734
01:21:58,690 --> 01:22:00,400
Għandi żewġ mistoqsijiet veru jew falz.

1735
01:22:00,400 --> 01:22:05,470
Jista 'xi ħadd tell me dritt bogħod
jekk dawn huma vera jew falza?

1736
01:22:05,470 --> 01:22:07,460
Iva, huwa falz.

1737
01:22:07,460 --> 01:22:07,960
Eżattament.

1738
01:22:07,960 --> 01:22:09,330
Kemm minnhom huma foloz.

1739
01:22:09,330 --> 01:22:12,682
Hekk billi tuża password wieħed
huwa idea qatt verament tajba

1740
01:22:12,682 --> 01:22:14,890
għaliex jekk xi ħadd jaf
password tiegħek, huma jistgħu biss

1741
01:22:14,890 --> 01:22:16,260
aċċess għal kulħadd għall-kontijiet l-oħra tiegħek.

1742
01:22:16,260 --> 01:22:19,260
U mbagħad ikoni jagħmlu xejn
biex tiġi żgurata s-sigurtà.

1743
01:22:19,260 --> 01:22:24,900
Aħna normalment għandha tfittex għal HTTPS
minflok HTTP u l-URL.

1744
01:22:24,900 --> 01:22:28,560
>> U xi tipi oħra ta '
attakki li konna msemmija,

1745
01:22:28,560 --> 01:22:31,390
li David ikun semma fid
lecture, attakki injezzjoni SQL.

1746
01:22:31,390 --> 01:22:37,310
Aħna diġà raw li jekk aħna don't-- l
Funzjoni query CS50 jagħmel ċert li SQL

1747
01:22:37,310 --> 01:22:39,530
attakki injezzjoni ma jistgħu jseħħu.

1748
01:22:39,530 --> 01:22:42,640
Imma jekk aħna ma kinux jużaw CS50,
kwotazzjoni, unquote "fl mistoqsija,"

1749
01:22:42,640 --> 01:22:46,830
rridu naraw li tiżgura li l-
jintuza mill-utent ma tkunx attwalment xi SQL

1750
01:22:46,830 --> 01:22:49,670
query li se jikkawżaw l
tabelli tagħna jintefgħu

1751
01:22:49,670 --> 01:22:54,070
jew xi ħaġa ħażina li
jiġri ma database tagħna.

1752
01:22:54,070 --> 01:22:56,790
>> Ħtif Sessjoni hija
tip ieħor ta 'attakk

1753
01:22:56,790 --> 01:23:05,940
li jiġri meta xi bad
persuna tuża sessjoni xi vittma

1754
01:23:05,940 --> 01:23:08,740
ID jaċċessaw l-informazzjoni login.

1755
01:23:08,740 --> 01:23:13,620
Allura eżempju trivjali ħafna ta 'dan huwa
bħal jekk ikollna kompjuter pubbliċi,

1756
01:23:13,620 --> 01:23:21,120
mela l-persuna ħażin zkuk u mbagħad
huma għandhom cookies li huma salvati.

1757
01:23:21,120 --> 01:23:23,380
U l-cookies ma jbiddlux għal sessjoni.

1758
01:23:23,380 --> 01:23:27,620
>> Imbagħad għandna l-vittma tmur fil
u mbagħad log fil-websajt.

1759
01:23:27,620 --> 01:23:30,290
Il-cookies ma jbiddlux
għal sessjoni ċerti.

1760
01:23:30,290 --> 01:23:33,060
U allura l-vittma zkuk fis
il-websajt u mbagħad iħalli.

1761
01:23:33,060 --> 01:23:36,190
U allura l-persuna li tmur lura
allura tista għadhom jużaw sessjoni ID tagħhom

1762
01:23:36,190 --> 01:23:37,430
aċċess għal informazzjoni tagħhom.

1763
01:23:37,430 --> 01:23:40,050
B'tali mod li eżempju wieħed ta
kif dan jista 'jiġri.

1764
01:23:40,050 --> 01:23:45,570
>> U allura jien ma jinkwetaw wisq
dwar kodiċi jew xi ħaġa speċifika

1765
01:23:45,570 --> 01:23:49,270
bħal dik li jistgħu jikkawżaw dan,
iżda li xi tip ta 'idea liema

1766
01:23:49,270 --> 01:23:51,400
l-varjabbli involuti f'dan huma.

1767
01:23:51,400 --> 01:23:53,897
U mbagħad timmanipula header
data hija tip ieħor ta 'attakk

1768
01:23:53,897 --> 01:23:55,230
li għandha David tkellem dwar.

1769
01:23:55,230 --> 01:23:59,730
U hija biss jirreferi għal
dak li jista 'jiġri meta

1770
01:23:59,730 --> 01:24:04,300
ir-rispons, l-HTTP
rispons ġewwa tal header tagħna

1771
01:24:04,300 --> 01:24:05,720
mhux sanitizzati kif suppost.

1772
01:24:05,720 --> 01:24:14,340
>> U xi wieħed minn fields-- per eżempju,
jekk xi ħadd overwrites wieħed mill-header

1773
01:24:14,340 --> 01:24:18,860
valuri li fihom xejn aktar minn
dak li għandhom contain-- u fil-fatt

1774
01:24:18,860 --> 01:24:22,720
fihom, per eżempju, ta '200
Kodiċi istatus OK, allura dawn

1775
01:24:22,720 --> 01:24:26,890
tista 'potenzjalment jagħmlu malizzjuż
affarijiet meta dawn mhux qed suppost.

1776
01:24:26,890 --> 01:24:30,815
Imma jiena ma tinkwieta wisq
ħafna dwar l-kodiċi speċifiku

1777
01:24:30,815 --> 01:24:34,110
li jistgħu jikkawżaw dan,
biss it-tip ta 'fehim

1778
01:24:34,110 --> 01:24:37,290
affarijiet ta 'livell għoli bħal dik.

1779
01:24:37,290 --> 01:24:39,570
>> Naħseb li dan huwa kollu
li għandna biex ikopru.

1780
01:24:39,570 --> 01:24:40,090
Amazing.

1781
01:24:40,090 --> 01:24:43,310
Kull min ikollu xi mistoqsijiet dwar xi
mill-affarijiet li aħna koperti?

1782
01:24:43,310 --> 01:24:44,213
Iva.

1783
01:24:44,213 --> 01:24:48,077
>> UDJENZA: Allura wieħed tip ta '
aktar kwistjoni loġistika.

1784
01:24:48,077 --> 01:24:53,400
Hija l-kontenut li prinċipalment jiffokaw
fuq affarijiet wara kwizz 1?

1785
01:24:53,400 --> 01:24:55,730
>> MARIA ZLATKOVA: So
kwistjoni hija, huwa l-kontenut

1786
01:24:55,730 --> 01:24:59,720
prinċipalment iffokati fuq affarijiet wara kwizz 1?

1787
01:24:59,720 --> 01:25:06,070
Allura l-fokus huwa fuq wara
kwizz 1, bl-eċċezzjoni

1788
01:25:06,070 --> 01:25:10,914
li għandna bżonn li wieħed jiffoka fuq affarijiet fil
pset5 u ħafna ta 'l-istrutturi tad-data

1789
01:25:10,914 --> 01:25:11,580
li aħna koperti.

1790
01:25:11,580 --> 01:25:14,300
U ma nistgħux ngħidu li aħna
tista 'tinjora xejn qabel

1791
01:25:14,300 --> 01:25:17,120
li minħabba li tibni fuq dan ukoll.

1792
01:25:17,120 --> 01:25:21,845
>> Allura tiffoka fuq li, flimkien ma 'materjal pset5
bħal inklużi listi marbuta, stacks,

1793
01:25:21,845 --> 01:25:23,720
kjuwijiet, u kollox
li Hannah marru fuq.

1794
01:25:23,720 --> 01:25:24,050
>> HANNAH Blumberg: Dritt.

1795
01:25:24,050 --> 01:25:27,450
Yeah, aħna marru fuq l-għalf C
fil-bidu nett malajr ħafna.

1796
01:25:27,450 --> 01:25:29,090
Imma kun żgur li tirrevedi dan.

1797
01:25:29,090 --> 01:25:32,700
Mur lura u tara l-analiżi kwizz 0.

1798
01:25:32,700 --> 01:25:36,110
>> Koppja noti aktar loġistiċi,
biss filwaqt li aħna għandna l-attenzjoni tiegħek.

1799
01:25:36,110 --> 01:25:39,100
Aħna ser ikollhom ħinijiet tal-uffiċċju
kemm-Tnejn u t-Tlieta bil-lejl.

1800
01:25:39,100 --> 01:25:41,540
Huma qed tmur biex tkun fil MD 119.

1801
01:25:41,540 --> 01:25:44,220
Dan huwa fuq il-websajt, hekk
jekk inti ma tismagħha, l-ebda inkwiet.

1802
01:25:44,220 --> 01:25:45,266
>> MARIA ZLATKOVA: 8:30-11:00.

1803
01:25:45,266 --> 01:25:46,260
>> HANNAH Blumberg: Yeah, 8:30-11:00.

1804
01:25:46,260 --> 01:25:46,910
Aħna ser jkun hemm.

1805
01:25:46,910 --> 01:25:48,368
Aħna ser ikunu hemm biex twieġeb mistoqsijiet.

1806
01:25:48,368 --> 01:25:49,480
Huwa chill pretty u gost.

1807
01:25:49,480 --> 01:25:53,240
You guys tista 'tistaqsi xi mistoqsijiet
li għandek fuq kwizz 1.

1808
01:25:53,240 --> 01:25:55,740
U kwizz 1 huwa fuq
L-Erbgħa, Xorti hekk tajjeb.

1809
01:25:55,740 --> 01:25:59,770
Jekk għandek xi mistoqsijiet, forsi
jiġu Kellimna up here one-on-one.

1810
01:25:59,770 --> 01:26:00,880
Kessaħ.

1811
01:26:00,880 --> 01:26:01,630
Grazzi hafna.

1812
01:26:01,630 --> 01:26:02,880
>> MARIA ZLATKOVA: Grazzi tant, guys.

1813
01:26:02,880 --> 01:26:03,480
>> UDJENZA: Yay.

1814
01:26:03,480 --> 01:26:05,930
>> [Applause]

1815
01:26:05,930 --> 01:26:07,530