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>> [Music kucheza]

2
00:00:01,940 --> 00:00:11,130

3
00:00:11,130 --> 00:00:14,620
>> DAVID Malan: Hii ni CS 50, na
huu ni mwanzo wa wiki tisa.

4
00:00:14,620 --> 00:00:18,240
Na nini sisi mawazo tunatarajia kufanya leo siyo
tu karibu sura juu ya wiki iliyopita

5
00:00:18,240 --> 00:00:22,670
nyenzo ambapo sisi ililenga server
upande mtandao programu kwa PHP na SQL,

6
00:00:22,670 --> 00:00:23,549
baadhi ya mambo database.

7
00:00:23,549 --> 00:00:25,590
Tutaweza majadiliano juu ya kidogo ya
usalama leo na kisha

8
00:00:25,590 --> 00:00:29,590
mpito kwa programu upande wa mteja
Lugha inayojulikana kama JavaScript.

9
00:00:29,590 --> 00:00:31,330
Lakini kwanza, baadhi ya ukombozi.

10
00:00:31,330 --> 00:00:35,030
>> Unaweza kukumbuka kuwa juu ya
Jumatano, mimi yaliyowekwa

11
00:00:35,030 --> 00:00:37,550
kuandika tovuti ya kwamba
alichukua katika pembejeo mtumiaji

12
00:00:37,550 --> 00:00:41,120
na HTML fomu kwamba kisha kuhifadhiwa
kwamba majina pembejeo user, simu

13
00:00:41,120 --> 00:00:43,124
namba, na simu ya mkononi
flygbolag katika database.

14
00:00:43,124 --> 00:00:45,540
Na kisha mimi alikuwa na amri kidogo
line script imeandikwa katika PHP

15
00:00:45,540 --> 00:00:47,956
kwamba ilitakiwa iterate
juu ya safu katika database

16
00:00:47,956 --> 00:00:49,400
na kutuma nje ujumbe wa maandishi.

17
00:00:49,400 --> 00:00:53,870
Licha kadhaa, majaribio kadhaa, sisi
hakuwa na kupata kwamba kazi na mwisho.

18
00:00:53,870 --> 00:00:57,820
>> Hivyo mimi alitumia wiki hii nzima kazi
juu ya kwamba kanuni kupata yetu nyuma hatua

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00:00:57,820 --> 00:01:01,220
ambapo sisi kushoto mbali, ambapo yote
I got na mwisho wa Jumatano

20
00:01:01,220 --> 00:01:05,500
ilikuwa ujumbe huu wa maandishi
kutoka Margo kama mimi Jihadi,

21
00:01:05,500 --> 00:01:09,940
ikifuatiwa na ujumbe wa maandishi kutoka mwingine
classmate, Nimepata hii Daudi.

22
00:01:09,940 --> 00:01:14,030
Ikifuatiwa na hii moja,
ajabu kutia moyo.

23
00:01:14,030 --> 00:01:15,840
Agizo juu ya kwenda, kutia moyo sana.

24
00:01:15,840 --> 00:01:20,960
Mimi karibu got ni mpaka then-- na
hiyo ni kumbuka sisi kumalizika siku ya Jumatano.

25
00:01:20,960 --> 00:01:25,850
Na kisha kweli labda favorite yangu,
wakati baadaye, hii alikuja katika.

26
00:01:25,850 --> 00:01:27,000
Damn kuishi mkondo.

27
00:01:27,000 --> 00:01:31,080
>> Hivyo leo, sisi kurekebisha hili na haraka
kuangalia nini mimi tumefanya tangu.

28
00:01:31,080 --> 00:01:35,440
Basi wote wa hii kanuni ya inapatikana
online kutoka wiki iliyopita, wiki nane,

29
00:01:35,440 --> 00:01:36,300
chanzo code.

30
00:01:36,300 --> 00:01:39,425
Na utaona kwamba nilikwenda kupitia,
na mimi kwa kweli kusafishwa up mambo kidogo.

31
00:01:39,425 --> 00:01:42,080
Mimi ilianzisha wanandoa nyingine
makala ya SQL database.

32
00:01:42,080 --> 00:01:45,300
Kwa mfano, badala ya
tu kufanya carrier ya var Char

33
00:01:45,300 --> 00:01:47,310
kama Nadhani alifanya juu ya kuruka wiki iliyopita.

34
00:01:47,310 --> 00:01:49,820
Mimi badala defined kama
kile kinachoitwa enum.

35
00:01:49,820 --> 00:01:53,310
>> Na baadhi ya unaweza kuwa na kuonekana hii
kama sisi Kugundua C. Enum ni kweli

36
00:01:53,310 --> 00:01:56,820
hulka ya C ambapo unaweza
enumerate rundo zima la constants

37
00:01:56,820 --> 00:01:59,640
na hawawajui yao maadili moja kwa moja,
kama moja, mbili, tatu, nne

38
00:01:59,640 --> 00:02:01,330
bila ya kuwa na namba ngumu kificho.

39
00:02:01,330 --> 00:02:04,780
Hivyo SQL inasaidia huo, ambapo kama
una uwanja database kwamba tu

40
00:02:04,780 --> 00:02:09,389
wanataka kuchukua moja ya finite
maadili, unaweza literally bayana ni

41
00:02:09,389 --> 00:02:13,120
kama nimefanya huko kwa wanne
maarufu Marekani Mkono flygbolag.

42
00:02:13,120 --> 00:02:13,819
>> Hivyo mimi alifanya hivyo.

43
00:02:13,819 --> 00:02:16,610
Na mimi alifanya idadi ya mabadiliko kama
vizuri, muhimu zaidi ya ambayo

44
00:02:16,610 --> 00:02:20,090
ilikuwa kupata email kufanya kazi kwa sababu wanakumbuka,
kwamba mpango huu kutegemewa ambayo

45
00:02:20,090 --> 00:02:23,470
ujumla aitwaye email
SMS gateway, ambayo ni tu

46
00:02:23,470 --> 00:02:27,670
njia dhana ya kusema kwamba Verizon, na
AT & T, na folks nyingine kusaidia server,

47
00:02:27,670 --> 00:02:30,740
ambapo kama inayopata
email, ni waongofu kwa SMS

48
00:02:30,740 --> 00:02:33,290
na kuzituma nje Nakala
ujumbe kwa simu ya mtu.

49
00:02:33,290 --> 00:02:37,010
Hivyo kama mimi alifanya hivyo kwa usahihi,
hapa ni mpya na kuboresha fomu

50
00:02:37,010 --> 00:02:39,259
kwamba ni kwenda kuzungumza na
mpya na kuboreshwa code, ambayo

51
00:02:39,259 --> 00:02:40,300
unaweza kucheza na online.

52
00:02:40,300 --> 00:02:44,140
Na itakuwa hopefully kufanya yangu
simu beep katika muda tu.

53
00:02:44,140 --> 00:02:47,240
>> Hivyo kwanza, mimi nina kwenda aina katika jina langu.

54
00:02:47,240 --> 00:02:51,400
Pili, mimi si kwenda
kufanya hili wakati huu.

55
00:02:51,400 --> 00:02:53,920
Mimi nina kwenda kufanya Kukagua kipengele.

56
00:02:53,920 --> 00:02:56,710
Na hii ni
kitu kidogo ili mimi si

57
00:02:56,710 --> 00:02:59,250
kujenga masaa ya uzalishaji baada
kazi kama mimi mara ya mwisho.

58
00:02:59,250 --> 00:03:02,300
Sasa kuna simu yangu ya simu.

59
00:03:02,300 --> 00:03:03,560
>> Mimi itabidi kuchagua Verizon.

60
00:03:03,560 --> 00:03:10,260
Na hapa, hebu kurejea kwenye kipaza sauti hii
hapa, na lengo hili katika simu yangu hapa.

61
00:03:10,260 --> 00:03:13,130
Mimi nina kwenda bonyeza Daftari,
ambayo lazima hopefully

62
00:03:13,130 --> 00:03:14,530
kuiweka katika database.

63
00:03:14,530 --> 00:03:16,780
Sasa mimi nina kwenda kwa
mstari amri mpango, ambayo

64
00:03:16,780 --> 00:03:20,825
wanakumbuka aliitwa dot slash
maandishi, na kuvuka vidole.

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00:03:20,825 --> 00:03:24,092

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00:03:24,092 --> 00:03:26,527
Hapa sisi kwenda.

67
00:03:26,527 --> 00:03:27,501
>> [PHONE dings]

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>> [Makofi]

69
00:03:28,962 --> 00:03:31,815

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DAVID Malan: Hivyo furaha zaidi kuliko this--
ni furaha, bila shaka, kama mimi kupata ndani yake.

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00:03:34,940 --> 00:03:38,004
Lakini ni furaha zaidi, mimi mawazo, kama sisi
kuundwa mmoja wa wale wakati movie

72
00:03:38,004 --> 00:03:40,420
ambapo kama kitu kweli
mbaya imetokea katika dunia,

73
00:03:40,420 --> 00:03:42,860
na kama wote NSA watu
simu za mikononi kuanza beeping

74
00:03:42,860 --> 00:03:44,860
na ujumbe wa maandishi
kuwatahadharisha kwao ukweli huu.

75
00:03:44,860 --> 00:03:47,026
Hivyo nimeona tunataka kujaribu
recreate sawa hapa,

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00:03:47,026 --> 00:03:49,610
ambapo si kutumia database,
Mimi badala mapema

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00:03:49,610 --> 00:03:51,490
aliandika mpango kwamba inaonekana kama hii.

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00:03:51,490 --> 00:03:53,660
>> Hii ni index.php--
na mimi kuweka kanuni hii online

79
00:03:53,660 --> 00:03:56,710
kama well-- kwamba inaonekana
tu mithili form.php,

80
00:03:56,710 --> 00:04:00,990
kutumia MVC style dhana kwamba sisi
majadiliano juu ya undani zaidi katika tatizo kuweka

81
00:04:00,990 --> 00:04:01,650
saba.

82
00:04:01,650 --> 00:04:02,910
Fomu kuwa ni pretty rahisi.

83
00:04:02,910 --> 00:04:06,634
Ni kwenda kuwasilisha kwa
faili inayoitwa here.php kupitia post.

84
00:04:06,634 --> 00:04:09,300
Na ni inaonekana kwenda kuuliza
kwa jina, na namba ya simu,

85
00:04:09,300 --> 00:04:11,400
na kisha kupitia kinachojulikana
Kuchagua menu, ni

86
00:04:11,400 --> 00:04:14,250
kwenda kukupa angalau nne
maarufu Marekani Mkono flygbolag,

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00:04:14,250 --> 00:04:17,470
na kisha kuruhusu ufanisi
kuchukua mahudhurio kwa kubonyeza hapa.

88
00:04:17,470 --> 00:04:20,471
>> Na hapa, wakati huo huo, ni kwenda
kukopa baadhi ya kanuni kutoka wakati wa mwisho.

89
00:04:20,471 --> 00:04:22,553
Na kama wewe tu skim hii,
utaona kwamba kuna

90
00:04:22,553 --> 00:04:23,900
rundo zima la kuangalia makosa.

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00:04:23,900 --> 00:04:26,640
Lakini uzuri mwishoni ni kwamba
sisi siyo kuandika database leo.

92
00:04:26,640 --> 00:04:29,130
Sisi ni kuweka rahisi na
kutuma tu nje hopefully

93
00:04:29,130 --> 00:04:32,190
ujumbe wa maandishi kupitia kazi mimi
aliandika juu ya siku chache zilizopita wito

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00:04:32,190 --> 00:04:36,270
Nakala, ambayo ni katika Kazi. php,
ambayo ni tena inapatikana online.

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00:04:36,270 --> 00:04:38,210
>> Hivyo kama ungependa kushiriki katika hili.

96
00:04:38,210 --> 00:04:40,190
Sisi siyo kwenda kuwa hifadhi ya kitu chochote.

97
00:04:40,190 --> 00:04:43,809
Kwenda URL hii hapa katika muda halisi.

98
00:04:43,809 --> 00:04:46,850
Je, si kuwasilisha bado tu, lakini hebu
kuona kama tunaweza kuwa mmoja wa haya movie

99
00:04:46,850 --> 00:04:49,830
wakati ambapo India ya kila mtu
kuanza beeping, hopefully tu

100
00:04:49,830 --> 00:04:53,580
mara moja mwaka huu tofauti mwaka 2011
ambapo alikwenda horribly awry.

101
00:04:53,580 --> 00:04:58,910
Na mara moja kwenda kwa anwani hiyo,
unapaswa kuona aina super rahisi

102
00:04:58,910 --> 00:05:03,884
kwamba kama una jina, simu ya mkononi
idadi, na simu ya mkononi carrier kwamba

103
00:05:03,884 --> 00:05:06,175
mechi orodha huko, kwenda
mbele na kujaza fomu.

104
00:05:06,175 --> 00:05:07,880
Lakini si hit kuwasilisha bado tu.

105
00:05:07,880 --> 00:05:10,850
>> aina kinaendelea kuangalia kama hii.

106
00:05:10,850 --> 00:05:13,660
Kwenda mbele na aina katika
jina lako, namba ya simu.

107
00:05:13,660 --> 00:05:17,670
OOP, mtu kinaendelea mbele ya Curve.

108
00:05:17,670 --> 00:05:18,170
Ni sawa.

109
00:05:18,170 --> 00:05:19,340
OK, kila mtu kujazwa fomu.

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00:05:19,340 --> 00:05:21,400
Hii lazima kazi juu ya
simu, pia, kama unataka.

111
00:05:21,400 --> 00:05:23,695
Haki zote, juu ya alama yako, kupata kuweka, kwenda.

112
00:05:23,695 --> 00:05:24,195
Kugonga Hapa.

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00:05:24,195 --> 00:05:27,275

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00:05:27,275 --> 00:05:27,775
Nini?

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00:05:27,775 --> 00:05:31,140

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00:05:31,140 --> 00:05:31,640
Hakuna

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00:05:31,640 --> 00:05:34,410

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00:05:34,410 --> 00:05:40,250
Naapa kwa Mungu, mimi kupimwa
mara nyingi hii leo.

119
00:05:40,250 --> 00:05:41,720
Wewe got it?

120
00:05:41,720 --> 00:05:43,145
>> [INTERPOSING VOICES]

121
00:05:43,145 --> 00:05:46,470

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00:05:46,470 --> 00:05:49,560
>> DAVID Malan: Sawa, kosa user labda.

123
00:05:49,560 --> 00:05:50,550
Hiyo ni mbili.

124
00:05:50,550 --> 00:05:53,300
Ni kazi kwa mbili nje ya
mia chache, tatu, nne.

125
00:05:53,300 --> 00:05:55,940
OK, hiyo ni nzuri.

126
00:05:55,940 --> 00:05:58,520
Wanne kati ya watano kwa
usahihi jinsi kuhusu.

127
00:05:58,520 --> 00:05:59,810
>> Hivyo kile kilichotokea tu?

128
00:05:59,810 --> 00:06:02,727
Hivyo labda, bila kuona yako
skrini, kwa nini kinaweza kuwa errored?

129
00:06:02,727 --> 00:06:05,518
Pengine ni kwamba sisi walikuwa tu
kujaribu kufanya uhusiano wengi mno

130
00:06:05,518 --> 00:06:08,110
Harvard ya server mail wote katika
mara moja kutoka anwani ya IP huo.

131
00:06:08,110 --> 00:06:10,740
Mimi tu guessing tangu sikuwa
anasa ya kupima

132
00:06:10,740 --> 00:06:13,220
kanuni hii na baadhi ya
Watu 300 katika mapema

133
00:06:13,220 --> 00:06:16,040
lakini kwa sasa kutambua kwamba
kwamba angalau lazima

134
00:06:16,040 --> 00:06:18,250
waliopata kazi kufanyika wakati huu.

135
00:06:18,250 --> 00:06:22,880
>> Haki wote, hivyo kwa nini ni hii yote
zaidi germane na nini kinaendelea?

136
00:06:22,880 --> 00:06:24,900
Vizuri kwanza, haraka
michache ya matangazo.

137
00:06:24,900 --> 00:06:29,350
Hivyo moja, kama Ningependa kujiunga Chang, na
Nick, na wengine katika chakula cha mchana Ijumaa hii,

138
00:06:29,350 --> 00:06:32,400
kufanya RSVP katika URL kawaida huko.

139
00:06:32,400 --> 00:06:35,650
Kama wewe ni kufikiri ya kuzingatia
katika au kufanya sekondari katika CS,

140
00:06:35,650 --> 00:06:38,941
kama wewe ni sophomore, au Freshman,
au hata junior au mwandamizi katika hatua hii

141
00:06:38,941 --> 00:06:42,490
na bado unaweza itapunguza katika kozi,
kutambua kwamba uhandisi shule

142
00:06:42,490 --> 00:06:45,620
ni kukusanya kwa ajili ya bure Ben na
Jerry ya cream barafu na ushauri

143
00:06:45,620 --> 00:06:48,910
Jumatano hii muda mfupi baada ya darasa
katika 04:00 katika jengo CS

144
00:06:48,910 --> 00:06:49,771
katika Maxwell Dworkin.

145
00:06:49,771 --> 00:06:51,520
Kama hii ni haraka sana
juu ya screen, tu kwenda

146
00:06:51,520 --> 00:06:55,260
kwa cs50.harvard.edu kwa
kiungo kwa tukio Facebook

147
00:06:55,260 --> 00:06:57,140
ambapo unaweza kuona maelezo zaidi.

148
00:06:57,140 --> 00:07:01,390
>> Wakati huo huo, nilidhani kusahihisha
Kitu nyingine moja mimi goofed juu ya Jumatano.

149
00:07:01,390 --> 00:07:04,400
Zinageuka kuwa ID Marko
kwenye Facebook hakuwa tatu.

150
00:07:04,400 --> 00:07:05,230
Ilikuwa nne.

151
00:07:05,230 --> 00:07:08,330
Zinageuka alikuwa mtihani zaidi
akaunti kuliko mimi kukumbuka.

152
00:07:08,330 --> 00:07:12,400
Lakini nini hii inaonekana kama fursa
kufanya ni kuvuta up URL kama hii.

153
00:07:12,400 --> 00:07:16,680
>> Hivyo ni zamu nje kwamba Facebook ana
API, Maombi Programming Interface,

154
00:07:16,680 --> 00:07:20,070
ambayo ni utaratibu ambapo wewe
Unaweza kuomba data programmatically

155
00:07:20,070 --> 00:07:24,480
katika Facebook na kupata nyuma mashine
habari someka, si kurasa za mtandao

156
00:07:24,480 --> 00:07:28,690
lakini Nakala tu mbichi, kitu
aitwaye JavaScript Object nukuu.

157
00:07:28,690 --> 00:07:32,150
Na kwa kweli, kama mimi kutembelea hii
URL, na kuvuta, kwa default,

158
00:07:32,150 --> 00:07:34,960
hii ni ya Marko hadharani
kupatikana habari.

159
00:07:34,960 --> 00:07:37,430
>> Na undani kuvutia
hapa ni kwamba tu ID wake

160
00:07:37,430 --> 00:07:40,670
ni kweli, idadi ya nne, ambayo mimi
barabara haraka kama mimi alifanya hivyo.

161
00:07:40,670 --> 00:07:44,260
Unaweza kufanya hivyo mwenyewe kama unajua
yako Facebook username kama una moja.

162
00:07:44,260 --> 00:07:45,440
Aina tu juu juu huko.

163
00:07:45,440 --> 00:07:46,640
Na hakuna wa hii ni binafsi.

164
00:07:46,640 --> 00:07:48,670
Mimi nina kufanya tu hii hata
katika mode fiche.

165
00:07:48,670 --> 00:07:49,900
Hivyo mimi si hata watumiaji katika.

166
00:07:49,900 --> 00:07:54,440
Na wewe ni kuona kwamba mimi
inaonekana alikuwa mtumiaji idadi 6454

167
00:07:54,440 --> 00:07:56,480
kwenye Facebook, ambayo si
mbaya sana siku hizi.

168
00:07:56,480 --> 00:07:59,900
Hivyo anyhow, utapata pia kuona
maelezo ya ziada huko.

169
00:07:59,900 --> 00:08:02,150
>> Na kipengele muhimu
ya kwamba ni kwamba

170
00:08:02,150 --> 00:08:06,890
kuandika programu yako mwenyewe kwamba
namna fulani samlar data kama hii

171
00:08:06,890 --> 00:08:08,170
ndani ya maombi yako mwenyewe.

172
00:08:08,170 --> 00:08:10,650
Unaweza kuwawezesha watumiaji
kuingia katika tovuti yako,

173
00:08:10,650 --> 00:08:14,190
si kwa kutumia yao wenyewe desturi jina la mtumiaji na
password lakini labda Facebook yao ya kuingia

174
00:08:14,190 --> 00:08:16,170
na kupata taarifa hata
kuhusu marafiki zao,

175
00:08:16,170 --> 00:08:18,740
kama kupitisha hizo, au sawa.

176
00:08:18,740 --> 00:08:21,430
Hivyo kumbuka kwamba CS50, pia,
ina baadhi ya APIs yake mwenyewe,

177
00:08:21,430 --> 00:08:24,620
moja kwa data shaka catalog,
baadhi kwa hugs menus katika dining

178
00:08:24,620 --> 00:08:26,730
kumbi, yote ya
majengo na maeneo

179
00:08:26,730 --> 00:08:30,930
juu ya chuo tuna API kwa pamoja
kwamba unaweza swala vile vile na kupata

180
00:08:30,930 --> 00:08:35,520
nyuma textual data kwamba unaweza kuunganisha
ndani ya PHP, au JavaScript, au hata,

181
00:08:35,520 --> 00:08:38,320
ingawa chini ya kawaida,
C msingi mradi wa mwisho.

182
00:08:38,320 --> 00:08:41,190
>> Hakika mbele kwa fainali
mradi ni milstenarna wachache.

183
00:08:41,190 --> 00:08:42,980
Wewe got email kutoka kwetu siku nyingine.

184
00:08:42,980 --> 00:08:45,761
Kutambua kwamba pendekezo
ni kutokana hii kuja Jumatatu.

185
00:08:45,761 --> 00:08:49,010
Ni si lazima kisheria, lakini
huna haja ya kupokea wenzake mafundisho yako

186
00:08:49,010 --> 00:08:51,260
kibali kabla ya kufanya
mabadiliko yoyote baada ya hapo.

187
00:08:51,260 --> 00:08:54,280
Na kisha mbele ni
idadi ya milstenarna nyingine.

188
00:08:54,280 --> 00:08:56,542
>> Hivyo kwa tease wewe, pia,
pamoja na baadhi ya uwezekano,

189
00:08:56,542 --> 00:08:58,250
tuna rundo la
haya hue balbu mwanga.

190
00:08:58,250 --> 00:09:01,190
Na baadhi ya guys sasa kuwa na baadhi ya
haya katika Dorm chumba yako pia.

191
00:09:01,190 --> 00:09:02,920
Na wao pia wana API.

192
00:09:02,920 --> 00:09:07,300
Hivyo kukumbuka wale wiki binary balbu
iliyopita kwamba Dan Bradley na Ansel

193
00:09:07,300 --> 00:09:08,780
Duff kuundwa kwa ajili yetu.

194
00:09:08,780 --> 00:09:12,560
Walitumia programu interface kwa
bulb hii mwanga, ambayo kwa wakati

195
00:09:12,560 --> 00:09:15,232
ni plugged katika umeme
na kisha kupitia wireless

196
00:09:15,232 --> 00:09:17,690
ni kushikamana na kitu kidogo
aitwaye Bridge chini hapa,

197
00:09:17,690 --> 00:09:21,280
kama kidogo router wamiliki
kifaa fulani.

198
00:09:21,280 --> 00:09:26,540
>> Lakini zinageuka kama mimi kujua jinsi ya
kutuma ujumbe HTTP, kama sisi wote sasa kufanya,

199
00:09:26,540 --> 00:09:31,670
Siwezi kutuma ujumbe kama hii kwa
bulb hii mwanga kugeuka juu au mbali

200
00:09:31,670 --> 00:09:34,000
au kufanya idadi yoyote ya
shughuli nyingine juu yake.

201
00:09:34,000 --> 00:09:36,110
Taarifa kwamba ni kupata, siyo baada.

202
00:09:36,110 --> 00:09:37,760
Kuna mwingine mmoja aitwaye kuweka.

203
00:09:37,760 --> 00:09:39,630
Kweli kuna nyingine chache verbs hiyo.

204
00:09:39,630 --> 00:09:42,920
Lakini kuna taarifa ya njia pale,
kufyeka API, kufyeka developer mpya,

205
00:09:42,920 --> 00:09:44,990
kufyeka mwanga, kufyeka moja, kufyeka hali.

206
00:09:44,990 --> 00:09:49,060
>> Hiyo inaonekana tu
njia kwamba kampuni, Philips,

207
00:09:49,060 --> 00:09:51,640
aliamua una hit
na ombi HTTP

208
00:09:51,640 --> 00:09:55,010
kama unataka kubadilisha hali
ya bulb kutumia HTTP 1.1.

209
00:09:55,010 --> 00:09:56,380
Basi taarifa line tupu.

210
00:09:56,380 --> 00:10:00,170
Na kisha mwisho kile kinachoonekana kama
aina ya safu ya aina fulani,

211
00:10:00,170 --> 00:10:04,730
hii tena ni kwenda kuitwa
JavaScript Object nukuu, au Jason.

212
00:10:04,730 --> 00:10:08,000
Na nini unaweza kuona hapa ni kwamba
kuna tatu thamani jozi muhimu.

213
00:10:08,000 --> 00:10:09,115
>> Ufunguo moja inaitwa juu.

214
00:10:09,115 --> 00:10:10,990
Na thamani yake inaonekana
ni kwenda kuwa kweli.

215
00:10:10,990 --> 00:10:13,612
Mwangaza ni 128, ambayo
ni baadhi ya aina ya int.

216
00:10:13,612 --> 00:10:15,820
Na kisha mpito wakati ni
sifuri, ambayo inaonekana

217
00:10:15,820 --> 00:10:17,970
muda gani kinaendelea
kuchukua kugeuka jambo hili juu.

218
00:10:17,970 --> 00:10:19,890
>> Hivyo sasa hivi bulb hii mwanga ni mbali.

219
00:10:19,890 --> 00:10:22,880
Lakini kama mimi kufanya hasa this-- basi
mimi kwenda kidogo kudanganya karatasi

220
00:10:22,880 --> 00:10:25,200
kwamba Dan kuanzisha katika
advance-- na mimi nina kwenda

221
00:10:25,200 --> 00:10:27,920
kwenda mbele na nakala
amri zifuatazo.

222
00:10:27,920 --> 00:10:30,200
Curl, kama baadhi ya wewe
anaweza kuwa zilizopatikana juu ya CS50

223
00:10:30,200 --> 00:10:35,080
Kujadili ni shirika kama Telnet kama
kwamba unaweza kuiga maombi HTTP,

224
00:10:35,080 --> 00:10:36,360
hasa unaweka.

225
00:10:36,360 --> 00:10:39,710
Siwezi kutuma data hii,
hasa nini sisi tu

226
00:10:39,710 --> 00:10:43,430
aliona wakati iliyopita hasa
URL hii zaidi ya hapa.

227
00:10:43,430 --> 00:10:46,310
Na kisha Curl ni kwenda kushughulikia
yote ya headers zinazohitajika

228
00:10:46,310 --> 00:10:47,600
na parsing kuna ya.

229
00:10:47,600 --> 00:10:54,700
>> Hivyo wote mimi kufanya ni nakala hii katika
dirisha terminal na kisha hit Enter.

230
00:10:54,700 --> 00:10:56,000
Na balbu ya mwanga unaendelea.

231
00:10:56,000 --> 00:10:59,060
Na hii yote ni kwenda kupitia
kompyuta yangu wirelessly

232
00:10:59,060 --> 00:11:01,960
namna fulani chini ya daraja, ambayo
kisha kuzungumza na bulb hii mwanga.

233
00:11:01,960 --> 00:11:02,960
Mimi siwezi kufanya kitu kingine.

234
00:11:02,960 --> 00:11:07,050
Siwezi kufanya jambo hili
kwenda nyekundu kwa mfano.

235
00:11:07,050 --> 00:11:11,040
Siwezi kwa mfano kufanya
jambo hili kwenda kijani.

236
00:11:11,040 --> 00:11:12,220
Siwezi kufanya ni kwenda bluu.

237
00:11:12,220 --> 00:11:14,760
>> Na taarifa katika kila moja ya haya
matukio, wote kwamba mimi nina kubadilisha

238
00:11:14,760 --> 00:11:18,540
ni kinachojulikana hue thamani kwa
kweli kuwapa baadhi ya rangi.

239
00:11:18,540 --> 00:11:20,320
Hivyo basi mimi kuweka hii moja katika pia.

240
00:11:20,320 --> 00:11:21,000
Sasa ni bluu.

241
00:11:21,000 --> 00:11:24,672
>> Na unaweza kufanya hata fancier
mambo where-- hebu kwenda kijani.

242
00:11:24,672 --> 00:11:26,630
Na mimi naweza kufanya hii ya
Bila shaka kwa kificho yangu mwenyewe.

243
00:11:26,630 --> 00:11:30,670
Lakini hata API yenyewe
inasaidia shughuli funky

244
00:11:30,670 --> 00:11:35,510
kama hii, ambayo sasa kujisumbua
sisi kwa ijayo sekunde 30.

245
00:11:35,510 --> 00:11:39,170
>> Hivyo hiyo ni moja ya ladha ya nini wapate
kufanya na API, hii moja kuwashirikisha

246
00:11:39,170 --> 00:11:40,010
balbu mwanga.

247
00:11:40,010 --> 00:11:42,510
Kumbuka kwamba CS50 ina michache
jozi ya Google kioo kama wewe d

248
00:11:42,510 --> 00:11:45,380
kama kukabiliana na kitu pamoja
wale mistari, Arduino Unos, ambayo

249
00:11:45,380 --> 00:11:48,670
ni vidogo kompyuta kidogo,
kimsingi, juu ya kidogo mzunguko wa bodi

250
00:11:48,670 --> 00:11:50,470
kwamba unaweza kuunganisha
waya na mambo mengine

251
00:11:50,470 --> 00:11:52,732
kwa kweli na kudhibiti
halisi ya mazingira ya dunia yako.

252
00:11:52,732 --> 00:11:54,940
Na kisha kuna wanandoa
toys mpya kwamba tuna.

253
00:11:54,940 --> 00:11:59,294
Hii moja halisi tu waliowasili
siku nyingine kwa njia ya barua, Myo uzinge.

254
00:11:59,294 --> 00:12:01,710
Na nilifikiri ni njia ya
kupata msisimko juu ya miradi

255
00:12:01,710 --> 00:12:03,720
kwamba unaweza kutumia na
vifaa hii ingekuwa

256
00:12:03,720 --> 00:12:08,900
kuwa kucheza video hii fupi
kwamba wao kutumia tease folks

257
00:12:08,900 --> 00:12:10,500
kwamba sisi ni sasa wanaishi katika siku zijazo.

258
00:12:10,500 --> 00:12:13,494

259
00:12:13,494 --> 00:12:15,490
>> [Music kucheza]

260
00:12:15,490 --> 00:13:33,410

261
00:13:33,410 --> 00:13:37,109
>> DAVID Malan: Hivyo katika wiki chache tu, unaweza
pia unaweza kuwa kwamba baridi katika CS50 haki.

262
00:13:37,109 --> 00:13:39,150
Kifaa kingine kwamba sisi
kuwa na rundo la kwamba sisi ni

263
00:13:39,150 --> 00:13:42,090
furaha mkopo nje kwa ajili ya miradi
inaitwa mwendo mtawala.

264
00:13:42,090 --> 00:13:45,030
Hii ni kifaa USB kidogo
kuungana kwa kompyuta kwamba

265
00:13:45,030 --> 00:13:47,520
utapata kuingiliana na
Laptop yako, Mac au PC,

266
00:13:47,520 --> 00:13:51,570
kana kwamba alikuwa kama Xbox Kinect
na kwa kweli kufanya mwendo kimwili sana

267
00:13:51,570 --> 00:13:54,509
kama sisi kuona katika hii
maono ya baadaye.

268
00:13:54,509 --> 00:13:56,505
>> [Music kucheza]

269
00:13:56,505 --> 00:15:03,380

270
00:15:03,380 --> 00:15:06,260
>> DAVID Malan: Hivyo hata kama una
wazo jinsi kitu kama hicho

271
00:15:06,260 --> 00:15:10,050
inaweza uwezekano kuwa zuliwa au kazi
juu ya ngazi ya vifaa, hakuna jambo.

272
00:15:10,050 --> 00:15:13,520
Hata baada ya miezi michache tu ya CS50,
na uelewa wa programu

273
00:15:13,520 --> 00:15:19,460
ujumla zaidi, na programu ya mtandao zaidi
hivi karibuni, na kisha pia APIs, na HTTP,

274
00:15:19,460 --> 00:15:21,830
itabidi upatikanaji kupitia
APIs programu kama wewe

275
00:15:21,830 --> 00:15:24,680
je wanataka kukopa mmoja wa haya
vifaa kwa kweli kuzungumza na yake

276
00:15:24,680 --> 00:15:27,180
na si kuwa na wasiwasi kuhusu
utekelezaji msingi

277
00:15:27,180 --> 00:15:30,220
maelezo, ambayo ni kabisa
sambamba na wazo hili la layering

278
00:15:30,220 --> 00:15:33,610
kufikirika kwamba tumekuwa
kuonekana katika muhula.

279
00:15:33,610 --> 00:15:37,990
>> Hivyo pia mwishoni mwa wiki,
aliona vipande michache ya habari.

280
00:15:37,990 --> 00:15:40,640
Kwenda kwanza, kwenda semina kama wewe
wangependa kujifunza kitu

281
00:15:40,640 --> 00:15:42,160
zaidi juu ya idadi yoyote ya mada.

282
00:15:42,160 --> 00:15:43,340
Angalia URL huko.

283
00:15:43,340 --> 00:15:45,890
Na hii moja alitumwa
mimi na Chang, ambao unajua,

284
00:15:45,890 --> 00:15:47,850
ambaye ni uchapishaji wa jeshi letu la tembo.

285
00:15:47,850 --> 00:15:49,910
Na ilikuwa kichwa cha habari kama ifuatavyo.

286
00:15:49,910 --> 00:15:51,280
Mimi nina hofu ya TV yangu mpya.

287
00:15:51,280 --> 00:15:54,301
Nini mimi nina hofu ya kurejea hii
Jambo juu na wewe d kuwa pia.

288
00:15:54,301 --> 00:15:56,050
Hivyo sisi ni sasa katika
kumweka katika muhula,

289
00:15:56,050 --> 00:15:58,860
pia, ambapo hata kama una
kidogo ya ufahamu

290
00:15:58,860 --> 00:16:02,620
ya jinsi ya mtandao matendo, na HTTP,
na usalama, mambo kama haya

291
00:16:02,620 --> 00:16:03,980
lazima kuanza kupata jicho lako.

292
00:16:03,980 --> 00:16:07,450
Lakini pia, itabidi kuelewa
kama mambo haya ni au si

293
00:16:07,450 --> 00:16:08,430
halisi vitisho.

294
00:16:08,430 --> 00:16:10,940
>> Hivyo mimi alichukua Sammandrag chache
kutoka makala hii hapa.

295
00:16:10,940 --> 00:16:12,540
Na hadithi ni kama ifuatavyo.

296
00:16:12,540 --> 00:16:14,300
Mimi nina sasa mmiliki wa
mpya smart TV, ambayo

297
00:16:14,300 --> 00:16:18,470
ahadi ya kutoa Streaming
maudhui multimedia, michezo, programu,

298
00:16:18,470 --> 00:16:21,450
kijamii vyombo vya habari, na biashara ya
kuvinjari, oh na TV pia.

299
00:16:21,450 --> 00:16:24,410
Tatizo tu ni kwamba mimi nina sasa
hofu ya kutumia hiyo, anasema mwandishi.

300
00:16:24,410 --> 00:16:29,592
Ungekuwa pia, kama kusoma kwa njia
Sera 46 ukurasa wa faragha kwa TV yako.

301
00:16:29,592 --> 00:16:31,800
kiasi cha data hii
inakusanya jambo ni kubwa.

302
00:16:31,800 --> 00:16:35,710
Ni kumbukumbu wapi, lini, jinsi, na
kwa muda gani kutumia TV.

303
00:16:35,710 --> 00:16:38,190
Ni seti kufuatilia biskuti,
kama tumekuwa kujadiliwa,

304
00:16:38,190 --> 00:16:40,560
na beacons iliyoundwa
kuchunguza wakati una

305
00:16:40,560 --> 00:16:43,185
kutazamwa bidhaa fulani au
ujumbe fulani email

306
00:16:43,185 --> 00:16:45,230
kama unataka kuangalia barua pepe juu ya TV yako.

307
00:16:45,230 --> 00:16:48,430
Ni kumbukumbu ya programu unaweza
kutumia, tovuti ya kutembelea,

308
00:16:48,430 --> 00:16:52,280
na jinsi ya kiutendaji na maudhui,
kufanya yote ya kwamba kupitia TV yako smart.

309
00:16:52,280 --> 00:16:55,470
Pia, creepier yet--
hiyo ni addition-- yangu

310
00:16:55,470 --> 00:16:58,140
imejenga katika kamera
na kutambua usoni.

311
00:16:58,140 --> 00:17:01,010
>> lengo ni kutoa
ishara ya kudhibiti kwa TV

312
00:17:01,010 --> 00:17:05,490
na kukuwezesha kuingia kwenye
Msako akaunti kwa kutumia uso wako.

313
00:17:05,490 --> 00:17:08,940
Katika suala la mafanikio, picha ni
kuokolewa kwenye TV badala ya kupakiwa

314
00:17:08,940 --> 00:17:09,940
server ushirika.

315
00:17:09,940 --> 00:17:12,520
On negativa, biashara
uhusiano hufanya TV nzima

316
00:17:12,520 --> 00:17:14,811
mazingira magumu na Hackare ambaye
wameonyesha uwezo

317
00:17:14,811 --> 00:17:16,700
kuchukua udhibiti kamili ya mashine.

318
00:17:16,700 --> 00:17:20,880
>> Zaidi kumsumbua, kama kwamba hakuwa
smart kutosha, ni kipaza sauti.

319
00:17:20,880 --> 00:17:23,599
TV boasts sauti
utambuzi kipengele

320
00:17:23,599 --> 00:17:26,859
ambayo inaruhusu watazamaji kudhibiti
screen na amri ya sauti.

321
00:17:26,859 --> 00:17:30,290
Lakini huduma kuja na
onyo badala ominous.

322
00:17:30,290 --> 00:17:33,030
Tafadhali kuwa na ufahamu kwamba kama
maneno yako amesema ni pamoja na

323
00:17:33,030 --> 00:17:36,210
binafsi au nyingine nyeti
habari, kwamba habari

324
00:17:36,210 --> 00:17:40,310
atakuwa miongoni mwa data alitekwa
na kupitishwa kwa chama cha tatu.

325
00:17:40,310 --> 00:17:40,870
Got kwamba?

326
00:17:40,870 --> 00:17:45,860
Je, si kusema binafsi au nyeti
mambo mbele ya TV yako.

327
00:17:45,860 --> 00:17:47,280
>> Hivyo hii ni kweli kwa kweli.

328
00:17:47,280 --> 00:17:50,530
Na ni vigumu si kwa kuona kama wewe
kwenda Best Buy au kama kwa TV

329
00:17:50,530 --> 00:17:51,030
siku hizi.

330
00:17:51,030 --> 00:17:52,540
Wao ni wote smart katika baadhi ya njia.

331
00:17:52,540 --> 00:17:54,740
Na wao ni kupata
nadhifu na creepier.

332
00:17:54,740 --> 00:17:57,490
Na wao ni tu kukusanya data
katika njia ambazo tumekuwa aliyesema kuhusu

333
00:17:57,490 --> 00:18:01,840
na kisha kuweka kupitia HTTP au
baadhi ya itifaki nyingine kwa baadhi ya server.

334
00:18:01,840 --> 00:18:05,720
>> Hivyo hii ilikuwa ya makala ya kujifurahisha
katika tovuti hii online

335
00:18:05,720 --> 00:18:08,940
hapa, ambayo kuongelea
mdudu fulani au makosa kificho

336
00:18:08,940 --> 00:18:11,340
kwamba tunaweza kweli kufunga
katika majadiliano ya wiki iliyopita.

337
00:18:11,340 --> 00:18:15,730
Hivyo kichwa cha habari hii ilikuwa kama
ifuatavyo, hadithi inakwenda hapa,

338
00:18:15,730 --> 00:18:18,720
Josh Breckman kazi kwa
kampuni hiyo ilitua mkataba

339
00:18:18,720 --> 00:18:22,390
kuendeleza usimamizi wa maudhui
mfumo, au CMS kama wao ni kuitwa,

340
00:18:22,390 --> 00:18:24,380
kwa ajili ya tovuti ya haki kubwa ya serikali.

341
00:18:24,380 --> 00:18:27,300
Mengi ya mradi wanaohusika
kuendeleza mfumo wa usimamizi wa maudhui

342
00:18:27,300 --> 00:18:29,840
hivyo kwamba wafanyakazi itakuwa
uwezo wa kujenga na kudumisha

343
00:18:29,840 --> 00:18:31,877
milele kubadilisha
bidhaa kwa ajili ya tovuti yao.

344
00:18:31,877 --> 00:18:34,210
Mambo akaenda pretty vizuri kwa
Siku chache baada ya kwenda kuishi.

345
00:18:34,210 --> 00:18:37,020
Lakini siku ya sita, mambo yalikwenda si hivyo vizuri.

346
00:18:37,020 --> 00:18:39,500
Yote ya yaliyomo kwenye
Tovuti alikuwa kabisa kutoweka.

347
00:18:39,500 --> 00:18:42,950
Na kurasa zote imesababisha default,
tafadhali kuingia maudhui ya mtandao ukurasa.

348
00:18:42,950 --> 00:18:43,810
Whoops.

349
00:18:43,810 --> 00:18:46,080
Josh aliitwa katika
kuchunguza na niliona

350
00:18:46,080 --> 00:18:49,390
kwamba moja hasa matatizo
nje IP alikuwa

351
00:18:49,390 --> 00:18:53,380
wamekwenda katika na ilifutwa yote ya
yaliyomo kwenye mfumo.

352
00:18:53,380 --> 00:18:56,290
>> IP hawakuwa
kwa baadhi ya nje ya nchi hacker bent

353
00:18:56,290 --> 00:18:58,340
juu ya kuharibu manufaa
habari za serikali.

354
00:18:58,340 --> 00:19:05,190
Ni kutatuliwa kwa googlebot.com,
Google ya mwenyewe sana mtandao kutambaa buibui.

355
00:19:05,190 --> 00:19:06,010
Whoops.

356
00:19:06,010 --> 00:19:09,150
Baada ya kidogo ya utafiti na scrambling
kuzunguka kutafuta Backup noncorrupt,

357
00:19:09,150 --> 00:19:10,180
Josh kupatikana tatizo.

358
00:19:10,180 --> 00:19:12,700
>> user alikuwa kunakiliwa na
pasted baadhi ya maudhui kutoka kwa mmoja

359
00:19:12,700 --> 00:19:15,670
ukurasa mwingine, ikiwa ni pamoja na
Hariri Hyperlink

360
00:19:15,670 --> 00:19:17,577
kuhariri maudhui juu ya ukurasa.

361
00:19:17,577 --> 00:19:20,160
Kwa kawaida hii bila kuwa na
Suala tangu user nje ingekuwa

362
00:19:20,160 --> 00:19:24,320
haja ya kuingia jina na password,
lakini mfumo wa uthibitishaji CMS,

363
00:19:24,320 --> 00:19:27,520
mfumo kuingia,
hakuwa na kuchukua katika akaunti

364
00:19:27,520 --> 00:19:30,980
kisasa Hacking
mbinu ya Google Spider.

365
00:19:30,980 --> 00:19:31,700
Whoops.

366
00:19:31,700 --> 00:19:33,610
>> Kama ni zamu nje, Google
Buibui haina kutumia

367
00:19:33,610 --> 00:19:36,950
biskuti, ambayo ina maana kwamba unaweza
urahisi bypass kuangalia kwa

368
00:19:36,950 --> 00:19:39,840
ni watumiaji juu ya kuweka kuki kuwa uongo.

369
00:19:39,840 --> 00:19:42,620
Ni pia haina makini na
JavaScript, ambayo kwa kawaida

370
00:19:42,620 --> 00:19:45,170
kuchochea na kuelekeza watumiaji
ambao si watumiaji katika.

371
00:19:45,170 --> 00:19:48,610
Haina hata hivyo kufuata kila
hyperlink juu ya kila ukurasa anaona,

372
00:19:48,610 --> 00:19:51,700
ikiwa ni pamoja na wale walio na
Kufuta Ukurasa katika cheo.

373
00:19:51,700 --> 00:19:52,650
Whoops.

374
00:19:52,650 --> 00:19:56,070
>> Hivyo hii ina maana gani katika zaidi
kiufundi lakini uungwana kupatikana masharti?

375
00:19:56,070 --> 00:19:58,340
Ni tu ina maana kwamba
katika tovuti yao,

376
00:19:58,340 --> 00:20:02,287
walikuwa URLs si tofauti hii moja kwamba
unaweza kuona katika tatizo kuweka saba.

377
00:20:02,287 --> 00:20:04,620
Kumbuka katika tatizo kuweka saba
au kujua katika tatizo kuweka saba

378
00:20:04,620 --> 00:20:06,411
kuwa wewe ni changamoto,
miongoni mwa mambo mengine,

379
00:20:06,411 --> 00:20:08,570
kuuza hifadhi kwa niaba ya watumiaji.

380
00:20:08,570 --> 00:20:14,010
Lakini utekelezaji kwamba kipengele kwa njia
ya kupata kupitia viungo katika user yako

381
00:20:14,010 --> 00:20:16,880
interface, pengine
si wazo smartest

382
00:20:16,880 --> 00:20:20,300
kwa sababu kama tovuti yako ni namna fulani
kupatikana ama kwa binadamu

383
00:20:20,300 --> 00:20:23,577
ambaye kubonyeza kuzunguka au kununua
bot kama Google au Spider

384
00:20:23,577 --> 00:20:26,160
kama wao ni kuitwa tu kwamba
kutambaa mtandao kujaribu index

385
00:20:26,160 --> 00:20:29,060
mtandao kama search injini,
hawakuweza urahisi sana

386
00:20:29,060 --> 00:20:31,340
kugonga kupitia kupata aina hii ya URL.

387
00:20:31,340 --> 00:20:33,770
Na kwamba ni functionally
sawa na, katika kesi hii,

388
00:20:33,770 --> 00:20:37,000
kuuza hisa zote za Google.

389
00:20:37,000 --> 00:20:40,030
>> Sasa kusema ukweli, ni kabisa
asinine kwamba CMS

390
00:20:40,030 --> 00:20:43,240
kutumika JavaScript na kuki
kutekeleza kuingia mfumo wake

391
00:20:43,240 --> 00:20:47,100
na si kufanya kwamba upande server, kama
nyie kufanya mapenzi na katika pset 7--

392
00:20:47,100 --> 00:20:49,940
kuna login.php
file-- daima, daima,

393
00:20:49,940 --> 00:20:52,789
daima usalama lazima
kufanyika katika upande server,

394
00:20:52,789 --> 00:20:56,080
si upande wa mteja kwa sababu, kama hii
Makala unaonyesha na wewe mwenyewe nguvu

395
00:20:56,080 --> 00:20:59,600
kuona katika baadhi ya uhakika, ni
dogo kwa mtumiaji, nzuri au mbaya,

396
00:20:59,600 --> 00:21:02,860
tu kugeuka mbali JavaScript
sembuse biskuti.

397
00:21:02,860 --> 00:21:06,020
Hivyo kwamba ni WTF yako ya kila siku.

398
00:21:06,020 --> 00:21:07,970
>> Kuna moja zaidi, ambayo
ni aina tu ya inatisha,

399
00:21:07,970 --> 00:21:11,360
hivyo mimi itabidi kutaja kama
tu kama maisha ya somo.

400
00:21:11,360 --> 00:21:14,850
Kila wewe kutumia maombi
aitwaye kama Snapchat au kama

401
00:21:14,850 --> 00:21:19,380
kwamba anasema picha hizi mwisho tu kwa
sekunde tano, sekunde kumi, au whatnot.

402
00:21:19,380 --> 00:21:21,680
Wao ni ephemeral Hiyo ni
kabisa si kesi.

403
00:21:21,680 --> 00:21:25,670
Kama hakuna njia, digital,
kutekeleza baadhi ya fomu ya video,

404
00:21:25,670 --> 00:21:30,150
au picha, au textual kugawana kama
kwamba mpokeaji mwisho mwingine

405
00:21:30,150 --> 00:21:31,660
hawezi namna fulani kuokoa data.

406
00:21:31,660 --> 00:21:34,300
>> Katika njia nyingi wasiojua, mtu
inaweza kuchukua simu zao.

407
00:21:34,300 --> 00:21:36,850
Na wao wana 10 wa pili dirisha
wakati kuangalia baadhi snap

408
00:21:36,850 --> 00:21:39,410
tu kuchukua baadhi ya simu nyingine
na kupiga picha hiyo, ni wazi.

409
00:21:39,410 --> 00:21:41,660
Hivyo unaweza kuhifadhi
kitu digital njia hiyo.

410
00:21:41,660 --> 00:21:44,620
Baadhi ya wewe kujua jinsi ya kuchukua
viwambo kwenye simu yako.

411
00:21:44,620 --> 00:21:49,290
Kwa kweli, kama wewe sijui huu,
kutambua kwamba angalau Snapchat,

412
00:21:49,290 --> 00:21:51,040
na nadhani wengine
maombi ya siku hizi,

413
00:21:51,040 --> 00:21:53,720
angalau kukuambia kama
mpokeaji ana kweli

414
00:21:53,720 --> 00:21:55,310
kuchukuliwa screenshot ya picha yako.

415
00:21:55,310 --> 00:22:00,870
>> Lakini bado mbaya, hii ilikuwa snappening,
kama mtu aliunda hivi karibuni,

416
00:22:00,870 --> 00:22:04,680
ambapo baadhi 100,000
snaps alikuwa iliyotolewa

417
00:22:04,680 --> 00:22:09,310
katika kile kinachoitwa torrent faili
kwenye tovuti mbalimbali hatimaye.

418
00:22:09,310 --> 00:22:12,000
Na hizi zilizomo rundo zima
ya ujumbe binafsi na posts.

419
00:22:12,000 --> 00:22:15,210
Ni zinageuka wengi wao benign,
hivyo si nini unaweza kutarajia.

420
00:22:15,210 --> 00:22:17,580
Lakini kwa sababu watu walikuwa
kutumika tovuti ya tatu chama,

421
00:22:17,580 --> 00:22:20,270
magogo katika na Snapchat yao
username na password na kisha

422
00:22:20,270 --> 00:22:23,470
kuokoa wote wa snaps yao
katika tovuti hii ya tatu ya chama.

423
00:22:23,470 --> 00:22:26,130
Na ilikuwa kwamba chama cha tatu
tovuti ya kwamba ilikuwa hacked,

424
00:22:26,130 --> 00:22:30,710
ambayo tu maana mtu figured nje ya jinsi
kupata yote pamoja 100,000 ya taswira hizo

425
00:22:30,710 --> 00:22:33,822
ndani ya gari ngumu yao wenyewe
kwa kushirikiana na baadae.

426
00:22:33,822 --> 00:22:36,030
Kusema ukweli, hapa pia, ni aina
ya asinine kwamba Snapchat

427
00:22:36,030 --> 00:22:39,360
unatekelezwa kwa namna ambayo
chama cha tatu unaweza aina ya kukatiza

428
00:22:39,360 --> 00:22:43,310
data na kwamba si amefungwa kwa yako
maombi mwenyewe mbio juu ya simu.

429
00:22:43,310 --> 00:22:46,947
Lakini hapa, pia, kutambua kwamba hizi
mambo lazima si kukamata wewe kwa mshangao,

430
00:22:46,947 --> 00:22:49,030
au angalau kuna lazima
kuwa somo maisha katika hapa.

431
00:22:49,030 --> 00:22:52,220
Kama Ningependa kiufundi
maelezo, kwenda URL kuna

432
00:22:52,220 --> 00:22:53,570
hiyo ni katika slides leo.

433
00:22:53,570 --> 00:23:00,960
Haki zote, maswali yoyote juu ya
leo maisha masomo katika CS?

434
00:23:00,960 --> 00:23:02,710
Kugeuka kuwa mbali.

435
00:23:02,710 --> 00:23:04,970
Chochote wakati wote?

436
00:23:04,970 --> 00:23:06,301
Chochote wakati wote?

437
00:23:06,301 --> 00:23:09,050
Mimi nimepata mengi ya watu kuangalia
Snapchat yao au kitu sasa.

438
00:23:09,050 --> 00:23:11,690
>> Haki wote, hivyo SQL,
Uliza muundo lugha.

439
00:23:11,690 --> 00:23:12,509
Hebu wrap hii.

440
00:23:12,509 --> 00:23:14,300
Na pia, ingawa
sisi ni scratching tu

441
00:23:14,300 --> 00:23:16,310
uso wa hii
lugha, tutaweza kukupa

442
00:23:16,310 --> 00:23:18,930
kutosha wa lugha
katika fomu ya pset 7

443
00:23:18,930 --> 00:23:22,140
ili uweze kukabiliana na baadhi
utendaji haki ya kawaida.

444
00:23:22,140 --> 00:23:24,912
Lakini kutambua kuna wanandoa
mambo ya sisi hawahitaji wewe,

445
00:23:24,912 --> 00:23:27,120
lakini wao wanaenda kuwa
muhimu kuja miradi ya mwisho

446
00:23:27,120 --> 00:23:30,760
na kwa hakika kuja kufanya halisi
Nje na watumiaji halisi

447
00:23:30,760 --> 00:23:32,040
ni uamuzi huu design.

448
00:23:32,040 --> 00:23:34,460
>> Ni zinageuka kuwa katika
Mbegu MySQL, wewe

449
00:23:34,460 --> 00:23:37,460
kuwa mashada ya uchaguzi kama
aina ya data kwa nguzo yako

450
00:23:37,460 --> 00:23:41,670
na mambo mengine, lakini pia una
uchaguzi wa kinachojulikana kuhifadhi

451
00:23:41,670 --> 00:23:44,570
injini kwa ajili ya yote ya data yako,
aina ya faili mfumo,

452
00:23:44,570 --> 00:23:46,700
kama wewe ni ukoo,
kwa wote wa data zako.

453
00:23:46,700 --> 00:23:48,830
Nini format ni hatimaye kuhifadhiwa katika?

454
00:23:48,830 --> 00:23:53,300
Na kawaida, pengine, imekuwa
MyiSAM na InnoDB, suala kiufundi

455
00:23:53,300 --> 00:23:56,060
kwamba tutaweza tu huduma kuhusu
kiasi kwamba mtu ana

456
00:23:56,060 --> 00:23:58,500
na moja haina
Kipengele zifuatazo.

457
00:23:58,500 --> 00:24:00,390
>> Tuseme kwamba una
kidogo Dorm friji.

458
00:24:00,390 --> 00:24:03,030
Na kudhani kuwa wewe na yako
roommate, ambao kushiriki friji huu,

459
00:24:03,030 --> 00:24:04,682
ni kweli uzoefu wa kusema maziwa.

460
00:24:04,682 --> 00:24:07,140
Na hii ni, kwa kweli, jinsi
hadithi aliambiwa kwangu njia ya nyuma

461
00:24:07,140 --> 00:24:10,890
katika siku wakati mimi alichukua kozi
aitwaye CS 161 Uendeshaji Systems, ambayo

462
00:24:10,890 --> 00:24:12,580
vile vile inahusu mada hii.

463
00:24:12,580 --> 00:24:13,760
Hivyo nimepata friji hii.

464
00:24:13,760 --> 00:24:14,630
Uko nje ya maziwa.

465
00:24:14,630 --> 00:24:17,000
Na wewe kuja nyumbani, roommate yako
bado katika darasa au chochote,

466
00:24:17,000 --> 00:24:19,208
na kuamua mimi nina kwenda
kwenda nje na kupata baadhi ya maziwa.

467
00:24:19,208 --> 00:24:22,630
Hivyo wewe karibu fridge, lockup
chumba Dorm, kwenda katika barabara ya

468
00:24:22,630 --> 00:24:25,330
kwa CVS au popote, na kupata
katika mstari wa kununua baadhi ya maziwa.

469
00:24:25,330 --> 00:24:28,960
>> Wakati huo huo, roommate yako anapata nyumbani
kutoka darasani, anapata katika chumba Dorm,

470
00:24:28,960 --> 00:24:31,802
kuufungua fridge, pia anatambua
ooph, tuko nje ya maziwa.

471
00:24:31,802 --> 00:24:33,760
Hivyo yeye au yeye anafunga
friji na kisha ikitokea

472
00:24:33,760 --> 00:24:35,610
kwenda CVS mengine,
ambayo hufanyika kuwa

473
00:24:35,610 --> 00:24:38,470
kuzuia moja mbali kutoka CVS nyingine
katika mraba, na anapata katika mstari

474
00:24:38,470 --> 00:24:40,230
kuna kupata baadhi ya maziwa.

475
00:24:40,230 --> 00:24:42,524
Dakika sasa, bila shaka, chache
baadaye, wote wawili kupata nyuma,

476
00:24:42,524 --> 00:24:44,690
na mbaya zaidi ya yote iwezekanavyo
matokeo kilichotokea.

477
00:24:44,690 --> 00:24:45,792
Wote wawili wa una maziwa.

478
00:24:45,792 --> 00:24:47,500
Na wewe si kweli
kama maziwa kiasi hicho.

479
00:24:47,500 --> 00:24:49,625
Hivyo mmoja wao ni tu
kwenda sour katika baadhi ya uhakika.

480
00:24:49,625 --> 00:24:55,941
Hivyo sasa una unywaji
maziwa katika friji wote kwa sababu kwa nini?

481
00:24:55,941 --> 00:24:57,072
>> [Inaudible]

482
00:24:57,072 --> 00:24:59,780
DAVID Malan: Yeah, hakuwa
namna fulani kuwasiliana na kila mmoja

483
00:24:59,780 --> 00:25:00,904
kwamba walikuwa kupata maziwa.

484
00:25:00,904 --> 00:25:04,320
Hivyo katika rahisi ya
njia katika ulimwengu wa binadamu,

485
00:25:04,320 --> 00:25:08,390
jinsi gani unaweza kuepuka hili silly
mazingira kutoka kinachotokea kama

486
00:25:08,390 --> 00:25:09,750
kwamba tu kuishia na moja.

487
00:25:09,750 --> 00:25:10,840
Nakala wao, ndiyo nzuri.

488
00:25:10,840 --> 00:25:12,877
Lakini jinsi mwingine?

489
00:25:12,877 --> 00:25:13,460
Baada ya inabainisha.

490
00:25:13,460 --> 00:25:14,626
DAVID Malan: Post-ni kumbuka.

491
00:25:14,626 --> 00:25:17,150
Aina yoyote ya mawasiliano
kwamba anaelezea roommate yako

492
00:25:17,150 --> 00:25:18,670
hawaendi katika friji kwa maziwa.

493
00:25:18,670 --> 00:25:20,440
Mimi nina kwenda kuliweka sawa juu yangu mwenyewe.

494
00:25:20,440 --> 00:25:22,770
Hivyo kwa namna fulani haja
kwa kufuli rasilimali hii.

495
00:25:22,770 --> 00:25:27,180
Hivyo tunaweza kufanya this-- tunaweza aina ya
uharibifu hadithi na kurejea katika hadithi CS

496
00:25:27,180 --> 00:25:30,360
ambapo kufikiria hili kama tu kama
kutofautiana, ambayo ni hifadhi ya baadhi ya thamani.

497
00:25:30,360 --> 00:25:32,570
Na hivi sasa,
thamani ya maziwa ni sifuri,

498
00:25:32,570 --> 00:25:35,410
ambayo hawataki yako
roommate kukagua kwamba kutofautiana

499
00:25:35,410 --> 00:25:38,730
na kisha kufanya uamuzi naye au mwenyewe
kulingana na hali ya kuwa kutofautiana

500
00:25:38,730 --> 00:25:42,430
kama wewe ni katika mchakato wa
kubadilisha hali ya kuwa kutofautiana.

501
00:25:42,430 --> 00:25:46,140
>> Hivyo moja ya mistari ya SQL kwamba sisi
kukupa katika pset 7 vipimo

502
00:25:46,140 --> 00:25:47,310
ni moja hii hapa.

503
00:25:47,310 --> 00:25:49,740
Na hatuwezi kutumia mkubwa
kiasi cha muda kuzungumza kuhusu suala hilo.

504
00:25:49,740 --> 00:25:55,100
Lakini zinageuka, kama wewe ni kujaribu
kununua baadhi ya hisa katika CS50 fedha

505
00:25:55,100 --> 00:25:58,000
kwamba tayari kuwa
baadhi ya hisa ya, wewe

506
00:25:58,000 --> 00:26:01,750
wanataka kuwa na uwezo wa kufanya idadi
mambo papo kwa pamoja.

507
00:26:01,750 --> 00:26:04,360
Unataka kuwa na uwezo wa
ufanisi, juu ya kiwango cha juu,

508
00:26:04,360 --> 00:26:06,700
kuangalia yote ya haki, kama nataka
kununua hisa zaidi ya Free,

509
00:26:06,700 --> 00:26:08,780
senti hisa sisi
majadiliano juu katika spec,

510
00:26:08,780 --> 00:26:10,660
Nataka kuangalia kwanza
hisa ngapi mimi.

511
00:26:10,660 --> 00:26:11,810
Na kudhani ni watano.

512
00:26:11,810 --> 00:26:14,600
Na nadhani wanataka
kununua 10 zaidi, mimi hatimaye

513
00:26:14,600 --> 00:26:17,069
wanataka kuwa 15 hisa za hisa.

514
00:26:17,069 --> 00:26:18,360
Hivyo nina kuuliza maswali mawili.

515
00:26:18,360 --> 00:26:20,230
Nini hali ya kutofautiana ni?

516
00:26:20,230 --> 00:26:21,470
Nini hali ya mstari ni?

517
00:26:21,470 --> 00:26:22,970
Hisa ngapi mimi sasa kuwa?

518
00:26:22,970 --> 00:26:24,636
Kisha unataka kwenda mbele na update.

519
00:26:24,636 --> 00:26:27,720
Hivyo hiyo ni Analog na
maziwa katika kuwa wewe kuangalia mstari,

520
00:26:27,720 --> 00:26:30,730
na kisha unataka update
kwa sababu kama unataka kununua 10 ya hisa,

521
00:26:30,730 --> 00:26:32,521
wewe hawataki kubadili
mstari wa 10,

522
00:26:32,521 --> 00:26:35,300
wanataka mabadiliko hayo kwa 5
plus 10 au, bila shaka, 15.

523
00:26:35,300 --> 00:26:40,030
>> Mstari wa kificho kuhakikisha kwamba
wale mawazo mawili dhana

524
00:26:40,030 --> 00:26:42,810
kutokea kwa pamoja au si wakati wote.

525
00:26:42,810 --> 00:26:46,920
Hakuna mtu, ikiwa ni pamoja na baadhi ya mtumiaji nyingine
ambaye ni watumiaji katika tovuti hiyo,

526
00:26:46,920 --> 00:26:49,900
unaweza namna fulani kupinga
kuangalia ya mstari

527
00:26:49,900 --> 00:26:52,960
na uppdatering ya mstari,
kuchagua na update kama wewe.

528
00:26:52,960 --> 00:26:57,360
Na syntax ni si super dhahiri,
lakini mstari huu moja, kwa muda mrefu ni ni,

529
00:26:57,360 --> 00:27:01,150
kuhakikisha kwamba wale shughuli mbili
kuangalia kutofautiana au kuangalia mstari

530
00:27:01,150 --> 00:27:04,660
na update mstari kutokea atomically.

531
00:27:04,660 --> 00:27:06,849
>> Oh hapa sisi kwenda tena.

532
00:27:06,849 --> 00:27:07,890
Ujumbe wa maandishi kwenye simu yangu.

533
00:27:07,890 --> 00:27:09,954
Basi hebu kufanya a hii
zaidi kidogo ya saruji.

534
00:27:09,954 --> 00:27:12,120
Tuseme kwamba wewe si
kutekeleza jokofu,

535
00:27:12,120 --> 00:27:16,400
na wewe si kutekeleza
Pset 7, lakini benki halisi,

536
00:27:16,400 --> 00:27:20,000
au ATM, kujiendesha Teller
Mashine, ambapo wewe kwa namna fulani

537
00:27:20,000 --> 00:27:22,960
wanataka kuwa na uwezo wa kuwawezesha
watumiaji kuhamisha fedha

538
00:27:22,960 --> 00:27:24,500
kutoka akaunti moja hadi nyingine.

539
00:27:24,500 --> 00:27:25,100
OK, hutegemea.

540
00:27:25,100 --> 00:27:26,683
Mimi nina kwenda bubu hii sasa, asante.

541
00:27:26,683 --> 00:27:30,450
Hivyo tunataka hoja fedha
kutoka kwa mmoja akaunti namba

542
00:27:30,450 --> 00:27:33,600
katika akaunti tofauti
idadi, hasa $ 100.

543
00:27:33,600 --> 00:27:37,690
Hivyo hii ni aina ya holela
mfano, ambapo wewe, ATM,

544
00:27:37,690 --> 00:27:41,060
kutaka kutekeleza mbili SQL
maswali, Ondoa kutoka akaunti moja,

545
00:27:41,060 --> 00:27:42,430
na kuongeza akaunti nyingine.

546
00:27:42,430 --> 00:27:46,766
Lakini unataka kuhakikisha kwamba hizi
mistari miwili wote wawili kutokea au si wakati wote.

547
00:27:46,766 --> 00:27:48,640
Wewe hawataki kitu
kupata kuingiliwa.

548
00:27:48,640 --> 00:27:51,440
Huna baadhi smart guy mbaya
namna fulani amesimama Benki Kuu ya Marekani

549
00:27:51,440 --> 00:27:53,270
na ATM mbili mbele
yake na kwa namna fulani

550
00:27:53,270 --> 00:27:55,270
aina ya kuandika katika
amri wakati huo huo,

551
00:27:55,270 --> 00:28:01,230
hopefully kujaribu dra $ 200 badala
ya $ 100 na tu baada ya $ 100 sifa.

552
00:28:01,230 --> 00:28:04,450
Kwa kifupi, unataka hii
kuishi hasa kama wewe kutarajia.

553
00:28:04,450 --> 00:28:06,540
>> Na njia ya kufanya
hii katika SQL database ni

554
00:28:06,540 --> 00:28:09,350
wewe wrap ni katika nini
aitwaye manunuzi.

555
00:28:09,350 --> 00:28:14,290
Halisi katika SQL, unaweza kupiga CS50 ya
swala kazi pamoja na kunukuu unquote kuanza

556
00:28:14,290 --> 00:28:15,370
manunuzi.

557
00:28:15,370 --> 00:28:18,640
Basi unaweza nitafanya idadi yoyote
ya maswali baadae SQL,

558
00:28:18,640 --> 00:28:20,870
lakini hakuna hata mmoja wao kuchukua
athari juu ya database

559
00:28:20,870 --> 00:28:25,880
mpaka wewe piga swala kunukuu unquote
kufanya, kama tena kwa kutumia PHP.

560
00:28:25,880 --> 00:28:29,810
Na kwa njia hii, unaweza kuhakikisha kwamba
watumiaji hata kama una 1,000 wote

561
00:28:29,810 --> 00:28:32,080
kupiga Mbegu yako
wakati huo huo, SQL

562
00:28:32,080 --> 00:28:34,540
ahadi kwamba hizi
maswali mawili itakuwa

563
00:28:34,540 --> 00:28:36,740
kutekelezwa haki moja baada ya nyingine.

564
00:28:36,740 --> 00:28:40,330
Hivyo huna kuishia na ziada ya
maziwa au kiasi vibaya, hatimaye,

565
00:28:40,330 --> 00:28:40,830
ya fedha.

566
00:28:40,830 --> 00:28:43,110
>> Hivyo kuweka hii katika akili,
si sana kwa pset 7

567
00:28:43,110 --> 00:28:45,250
lakini kwa ajili ya miradi ya mwisho
kama wewe ni kweli

568
00:28:45,250 --> 00:28:49,690
kujaribu hoja data kuzunguka
hela meza kama wewe huenda hapa.

569
00:28:49,690 --> 00:28:53,980
Lakini labda hata rahisi na zaidi
dhahiri kuelewa na mfano

570
00:28:53,980 --> 00:28:54,860
ni moja hii hapa.

571
00:28:54,860 --> 00:28:57,760
Na mtu Emailed sisi kuhusu
hii tu siku nyingine

572
00:28:57,760 --> 00:28:59,600
alipoona kitu sawa online.

573
00:28:59,600 --> 00:29:03,480
>> Hivyo kwa ufahamu wangu, mfumo siri
si katika mazingira magumu na shambulio hilo.

574
00:29:03,480 --> 00:29:06,637
Na mimi sina wazo kama hata matumizi
Mbegu SQL chini ya kofia.

575
00:29:06,637 --> 00:29:08,470
Lakini hebu kuitumia kwa
ajili ya majadiliano.

576
00:29:08,470 --> 00:29:10,178
Hapa ni screen kwamba
Harvard folks huwa

577
00:29:10,178 --> 00:29:13,620
kuona wakati magogo katika na wao
Harvard ID simu na siri zao.

578
00:29:13,620 --> 00:29:19,020
Na tuseme kwamba mfumo siri walikuwa
kutekelezwa katika PHP na MySQL na

579
00:29:19,020 --> 00:29:22,000
Mbegu, kanuni kwamba mtu
Miaka anaweza kuwa imeandikwa iliyopita

580
00:29:22,000 --> 00:29:23,270
ili kuangalia kama hii.

581
00:29:23,270 --> 00:29:25,230
Kwanza, kutangaza
kutofautiana aitwaye jina la mtumiaji.

582
00:29:25,230 --> 00:29:27,560
Na tu kupata kwamba kutoka
POST superglobal.

583
00:29:27,560 --> 00:29:30,140
Kisha kupata mwingine kutofautiana
aitwaye password na kufanya hivyo.

584
00:29:30,140 --> 00:29:33,080
Na kisha tu nitafanya
hii swala muda mrefu hapa,

585
00:29:33,080 --> 00:29:36,690
kuchagua nyota kutoka kwa watumiaji ambapo
jina la mtumiaji sawa vile na vile

586
00:29:36,690 --> 00:29:38,510
na password sawa vile na vile.

587
00:29:38,510 --> 00:29:40,660
>> Taarifa kwamba curly
braces nimekuwa kutumika hapa

588
00:29:40,660 --> 00:29:42,880
tu maana kwa PHP, kwenda
mbele na badala

589
00:29:42,880 --> 00:29:45,400
thamani ya hizo mbili
vigezo haki pale.

590
00:29:45,400 --> 00:29:50,090
Wao siyo madhubuti muhimu, lakini
wao huwa na kuepuka makosa hila syntax.

591
00:29:50,090 --> 00:29:53,650
Hivyo hii inaonekana kabisa
sahihi katika mtazamo wa kwanza.

592
00:29:53,650 --> 00:29:54,240
Na ni.

593
00:29:54,240 --> 00:29:56,680
Unaweza kutekeleza
mfumo siri kwa njia hii.

594
00:29:56,680 --> 00:30:00,460
>> Lakini tuseme kwamba super
smart na malicious mwanafunzi

595
00:30:00,460 --> 00:30:03,020
pembejeo kama hii siri yake.

596
00:30:03,020 --> 00:30:05,550
Hivyo nimekuwa kuondolewa risasi
ishara hapa katika maskhara juu,

597
00:30:05,550 --> 00:30:08,760
na nimekuwa kweli umebaini
nini yeye au anaweza kuwa kuandika.

598
00:30:08,760 --> 00:30:10,350
Na ni ajabu kidogo.

599
00:30:10,350 --> 00:30:13,850
Lakini anaruka nini nje saa wewe katika uwezekano
inatia mashaka kuhusu pembejeo mtumiaji,

600
00:30:13,850 --> 00:30:16,450
hata kama wewe hawana wazo nini
Mashambulizi SQL sindano ina maana.

601
00:30:16,450 --> 00:30:20,300
Kwa nini hii kuangalia fishy kidogo?

602
00:30:20,300 --> 00:30:21,050
Nini hiyo?

603
00:30:21,050 --> 00:30:21,550
[Inaudible]

604
00:30:21,550 --> 00:30:24,260
DAVID Malan: au ni
kidogo tuhuma.

605
00:30:24,260 --> 00:30:26,310
Kwa kweli, kwamba ni Keyword kutoka SQL.

606
00:30:26,310 --> 00:30:28,105
Ili hakuendani.

607
00:30:28,105 --> 00:30:29,980
ukweli kwamba kuna
quotes haya yote moja

608
00:30:29,980 --> 00:30:32,646
there-- kwa kweli, moja ya njia rahisi
njia ya kuvunja baadhi databaser

609
00:30:32,646 --> 00:30:35,880
ni kwa kuandika katika jina kama O'Reilly
ambayo ina apostrophe ndani yake

610
00:30:35,880 --> 00:30:38,600
kwa sababu kama binadamu ambaye aliandika
kificho nyuma ya pazia

611
00:30:38,600 --> 00:30:41,570
haina kuchukua katika akaunti ya kwamba kuna
inaweza kuwa quotes moja katika mtumiaji

612
00:30:41,570 --> 00:30:45,060
pembejeo, na yeye au yeye ni kutumia
quotes moja katika kanuni zao,

613
00:30:45,060 --> 00:30:46,040
mambo mabaya yanaweza kutokea.

614
00:30:46,040 --> 00:30:47,870
>> Kwa kweli, bado mbaya, fikiria hili.

615
00:30:47,870 --> 00:30:50,600
Kama hii ilikuwa tena kificho
kwamba mtu katika miaka Harvard

616
00:30:50,600 --> 00:30:53,100
iliyopita aliandika kwa siri
mfumo, taarifa nini

617
00:30:53,100 --> 00:30:56,220
kuhusu kupata kubadilishwa
kwa username na password

618
00:30:56,220 --> 00:30:59,780
kama aina ya mtumiaji katika tena
skroob kama jina la mtumiaji yao

619
00:30:59,780 --> 00:31:03,960
na kisha moja, mbili, tatu, nne, tano,
quote au kunukuu unquote moja sawa

620
00:31:03,960 --> 00:31:04,660
kunukuu moja.

621
00:31:04,660 --> 00:31:07,220
Na taarifa nini msingi
hapa ni user hana

622
00:31:07,220 --> 00:31:09,900
kuanza password yao au
siri zao kwa kunukuu.

623
00:31:09,900 --> 00:31:12,610
Na wao si kumalizika ni
kwa kunukuu kwa sababu yeye au yeye

624
00:31:12,610 --> 00:31:16,315
ni kuchukua kwamba kama
programu haikuwa hivyo mkali,

625
00:31:16,315 --> 00:31:18,690
wao ni kwenda na wale
quotes moja katika kanuni zao.

626
00:31:18,690 --> 00:31:19,860
>> Hivyo hapa ni kificho.

627
00:31:19,860 --> 00:31:23,820
Na badala ya kuwa
ili sasa kutokea ni hii.

628
00:31:23,820 --> 00:31:26,350
Na nimekuwa alisisitiza kile
user ina typed katika.

629
00:31:26,350 --> 00:31:28,480
Hivyo kabla, baada ya.

630
00:31:28,480 --> 00:31:33,330
Na taarifa nini upole inatia mashaka sasa
kuhusu nusu haki ya kificho hii SQL?

631
00:31:33,330 --> 00:31:36,300
Ni kidogo ngumu zaidi, admittedly,
kuliko maswali tumeona.

632
00:31:36,300 --> 00:31:38,550
Lakini hii haiwezi uwezekano
kuwa ni jambo jema kama wewe ni

633
00:31:38,550 --> 00:31:42,240
akisema kuchagua nyota, ambayo ni kuchagua
kila kitu kutoka mtumiaji meza

634
00:31:42,240 --> 00:31:46,630
ambapo jina la mtumiaji sawa skroob na
password sawa moja, mbili, tatu, nne,

635
00:31:46,630 --> 00:31:49,610
tano au moja sawa na moja.

636
00:31:49,610 --> 00:31:53,860
Nini maana mantiki
ya kwamba kifungu mwisho labda?

637
00:31:53,860 --> 00:31:55,650
Ni tu kweli daima.

638
00:31:55,650 --> 00:31:59,930
>> Na kwa sababu tuna aina ya guessed
au figured nje kwa majaribio na makosa

639
00:31:59,930 --> 00:32:02,760
kwamba programu ambaye
aliandika kificho hakufanya hivyo

640
00:32:02,760 --> 00:32:07,250
wanatarajia binadamu au mbaya
kuandika katika quotes moja kama vile,

641
00:32:07,250 --> 00:32:10,350
tunaweza syntactically
kukamilisha SQL query

642
00:32:10,350 --> 00:32:12,260
na kitu nonsensical
lakini kitu ambacho

643
00:32:12,260 --> 00:32:15,930
ni syntactically sahihi
kwamba daima kutathmini kwa kweli.

644
00:32:15,930 --> 00:32:19,130
Hivyo kama kanuni hii ni kuwa kutumika kujibu
swali kweli au uongo lazima

645
00:32:19,130 --> 00:32:22,930
user hii kuruhusiwa kupita,
Jibu ni daima inaonekana kwenda

646
00:32:22,930 --> 00:32:26,930
kuwa ni kweli kwa sababu hii ni daima kwenda
kuchagua kitu kutoka orodha

647
00:32:26,930 --> 00:32:29,280
kwa sababu moja ya shaka daima ni sawa na moja.

648
00:32:29,280 --> 00:32:30,360
>> Basi nini ufumbuzi?

649
00:32:30,360 --> 00:32:33,290
Vizuri katika pset 7, sisi kweli
kuepuka hili wote pamoja.

650
00:32:33,290 --> 00:32:37,360
Sisi kukupa kazi swala, na sisi
kuhimiza wewe kutumia alama swali

651
00:32:37,360 --> 00:32:40,430
kama placeholders, sawa
katika roho kwa printf ya% s,

652
00:32:40,430 --> 00:32:43,710
lakini nini muhimu kuhusu alama swali
hapa ni kweli kama kusoma kwa njia

653
00:32:43,710 --> 00:32:46,950
functions.php, ambapo wetu
swala kazi ni kutekelezwa,

654
00:32:46,950 --> 00:32:52,780
alama ya wale swali ni alitoroka,
ambapo kitu chochote uwezekano wa hatari

655
00:32:52,780 --> 00:32:58,210
kama quote moja ni akageuka
ndani ya alitoroka moja kunukuu.

656
00:32:58,210 --> 00:33:00,590
>> Hivyo hii ni nini
kweli yanatokea kama wewe

657
00:33:00,590 --> 00:33:04,850
kutumia CS50 ya swala kazi au idadi yoyote
ya chama cha tatu maktaba bure kwamba

658
00:33:04,850 --> 00:33:06,000
kufanya hivyo.

659
00:33:06,000 --> 00:33:09,850
Haijalishi katika kesi hii, kijani,
kama mtumiaji ina typed katika kunukuu moja

660
00:33:09,850 --> 00:33:12,070
kwa sababu ya swala
kazi ambayo sisi aliandika ni

661
00:33:12,070 --> 00:33:15,120
kwenda kuongeza backslashes kabla
yoyote vile hatari kunukuu.

662
00:33:15,120 --> 00:33:17,360
Hivyo hii si, katika
kweli, itakuwa legit.

663
00:33:17,360 --> 00:33:20,910
Hii ni kama kuandika katika mambo kuangalia
password kwamba, bila shaka, si kwenda

664
00:33:20,910 --> 00:33:23,490
kuwa password skroob ya halisi.

665
00:33:23,490 --> 00:33:28,260
>> Hivyo takeaway kwa CS50 ni mmoja,
kabisa daima kutumia kitu

666
00:33:28,260 --> 00:33:30,860
kama CS50 ya swala kazi
au maktaba ya msingi,

667
00:33:30,860 --> 00:33:32,560
ambayo hufanyika kuitwa PDO.

668
00:33:32,560 --> 00:33:35,880
Lakini kamwe, kamwe,
kamwe kufanya kificho kama hii

669
00:33:35,880 --> 00:33:39,472
bila ya kukimbia au scrubbing
kama wanasema pembejeo yako.

670
00:33:39,472 --> 00:33:42,430
Na wewe wakati fulani pengine
kuja katika baadhi ya tovuti kama hii.

671
00:33:42,430 --> 00:33:46,060
Kwa kweli, inaonekana kuwa kesi
kama katika viwanja vya ndege na hoteli katika maeneo

672
00:33:46,060 --> 00:33:48,880
ambapo wana bure Wi-Fi
upatikanaji kwamba una kuingia kwa,

673
00:33:48,880 --> 00:33:51,010
tovuti hizi ni daima
horribly kutekelezwa.

674
00:33:51,010 --> 00:33:55,680
Na hivyo aina ya furaha nyumbani mazoezi,
si kwa madhumuni ya malicious au zaidi

675
00:33:55,680 --> 00:33:59,170
ya furaha juu ya barabara
zoezi, ni aina tu

676
00:33:59,170 --> 00:34:02,850
apostrophe, quote moja,
katika fomu juu ya baadhi ya tovuti

677
00:34:02,850 --> 00:34:03,810
na kuona nini kinatokea.

678
00:34:03,810 --> 00:34:06,660
Na kama server shambulio au anatoa
you baadhi ya aina ya ujumbe wa makosa,

679
00:34:06,660 --> 00:34:09,690
inaweza vizuri sana kuwa
mtu hana hamu hii.

680
00:34:09,690 --> 00:34:15,239
Na kisha lazima tahadhari sahihi
mamlaka na kuendelea zaidi.

681
00:34:15,239 --> 00:34:20,843
>> Hivyo sasa nyie lazima hopefully
kuelewa kidogo zaidi geek ucheshi hapa.

682
00:34:20,843 --> 00:34:24,120
>> [Kicheko]

683
00:34:24,120 --> 00:34:27,571

684
00:34:27,571 --> 00:34:29,070
DAVID Malan: Unajua wewe ni geek.

685
00:34:29,070 --> 00:34:30,944
Kwa ajili ya pili kadhaa
miaka, utakuwa kukumbuka

686
00:34:30,944 --> 00:34:33,520
ambao kidogo Bobby Meza ni
sababu ya hii cartoon hapa.

687
00:34:33,520 --> 00:34:36,760
Hivyo kuendelea kuwa katika akili kama sisi
kubadili mazingira mara moja ya mwisho

688
00:34:36,760 --> 00:34:38,770
leo JavaScript.

689
00:34:38,770 --> 00:34:41,600
Tumekuwa alitumia kiasi kidogo
wakati juu ya syntax ya PHP

690
00:34:41,600 --> 00:34:43,440
kwa sababu ni kweli
super sawa na C.

691
00:34:43,440 --> 00:34:47,300
Na nicely kutosha, JavaScript pia
ni super sawa na C ya syntax

692
00:34:47,300 --> 00:34:49,639
vile vile tutaweza kuona katika
muda tu na kama tutaweza

693
00:34:49,639 --> 00:34:51,205
kuona baadaye wiki hii hasa.

694
00:34:51,205 --> 00:34:54,080
Nini unaweza kufanya na lugha hii,
ingawa, ni nguvu zote zaidi,

695
00:34:54,080 --> 00:34:55,790
hasa kwa APIs.

696
00:34:55,790 --> 00:34:56,960
>> Lakini kwanza ya ziara ya haraka.

697
00:34:56,960 --> 00:35:00,450
Hivyo moja, katika JavaScript, kuna
hakuna kazi kubwa, ambayo ni nzuri.

698
00:35:00,450 --> 00:35:02,650
Kama na PHP, unaweza tu kuandika code.

699
00:35:02,650 --> 00:35:04,310
Masharti kuangalia kama hii.

700
00:35:04,310 --> 00:35:07,100
Na maneno Boolean nguvu
kuangalia kama hii au kama hii.

701
00:35:07,100 --> 00:35:09,530
Swichi zipo, na wao
ili kuangalia kama hii.

702
00:35:09,530 --> 00:35:10,970
Wanne loops kuangalia kama hii.

703
00:35:10,970 --> 00:35:12,390
Wakati loops kuangalia kama hii.

704
00:35:12,390 --> 00:35:14,160
Kufanya whiles kuangalia kama hii.

705
00:35:14,160 --> 00:35:16,850
Na kisha kuangalia kama arrays
hii, ni sawa na PHP.

706
00:35:16,850 --> 00:35:20,740
Lakini taarifa kwamba, katika JavaScript unaweza
kutangaza variable si kwa dola

707
00:35:20,740 --> 00:35:25,190
ishara, si kwa aina data halisi lakini
kwa kusema var kwa kutofautiana mbele yake.

708
00:35:25,190 --> 00:35:27,900
Ni pia ni loosely typed
kwa kuwa ina aina,

709
00:35:27,900 --> 00:35:29,729
lakini huna waziwazi kutangaza yao.

710
00:35:29,729 --> 00:35:31,520
Na kisha kamba, kwa
mfano, ili kuangalia

711
00:35:31,520 --> 00:35:34,350
kama hii, kwamba kamba
kuitwa s katika kesi hii.

712
00:35:34,350 --> 00:35:35,410
Na kisha kitu.

713
00:35:35,410 --> 00:35:37,010
Na hawa tutaweza kuona zaidi kabla ya muda mrefu.

714
00:35:37,010 --> 00:35:41,470
Na kitu labda ni moja ya
kawaida kuonekana miundo data

715
00:35:41,470 --> 00:35:44,050
katika JavaScript msingi
mpango kwa sababu inaruhusu

716
00:35:44,050 --> 00:35:46,680
wewe kujiunga holela
thamani jozi ufunguo tu

717
00:35:46,680 --> 00:35:51,240
kama PHP ya arrays associative
na kama tu hash yako mwenyewe meza

718
00:35:51,240 --> 00:35:54,042
au kujaribu kama sisi kutekelezwa
wiki chache nyuma.

719
00:35:54,042 --> 00:35:56,250
Basi hebu kweli kuona nini
tunaweza kufanya na JavaScript.

720
00:35:56,250 --> 00:35:59,410
Na hasa, hii ni
kufulia orodha ya makala

721
00:35:59,410 --> 00:36:02,300
kwamba browsers na kwamba
kuruhusu sisi kunasa JavaScript

722
00:36:02,300 --> 00:36:05,470
ndani ya tovuti kwa njia zifuatazo.

723
00:36:05,470 --> 00:36:09,340
JavaScript ni mara nyingi hutumika kama
mteja upande lugha scripting.

724
00:36:09,340 --> 00:36:10,130
Ni si ulioandaliwa.

725
00:36:10,130 --> 00:36:11,370
Ni pia ni kufasiriwa.

726
00:36:11,370 --> 00:36:15,740
Lakini tofauti PHP, ambayo imekuwa mbio
juu ya server, katika mtandao wa kompyuta,

727
00:36:15,740 --> 00:36:18,220
au ndani ya kina ya
wateja, JavaScript

728
00:36:18,220 --> 00:36:22,190
ni tofauti katika kwamba
kawaida anaendesha katika browser.

729
00:36:22,190 --> 00:36:26,060
>> Hivyo yoyote kificho JavaScript kuanza kuandika
kwa pset 8, au mradi wako wa mwisho,

730
00:36:26,060 --> 00:36:29,890
au katika ulimwengu wa kweli kwa ujumla kwenda
kuokolewa kwenye kompyuta, kabisa

731
00:36:29,890 --> 00:36:33,110
katika HTML dot dot au
JS kwa JavaScript faili.

732
00:36:33,110 --> 00:36:35,770
Lakini browser ni kwenda
kwa kushusha kwamba JavaScript

733
00:36:35,770 --> 00:36:39,530
kificho kwa mfano yako mwenyewe ya Chrome,
au IE, Firefox au, au chochote.

734
00:36:39,530 --> 00:36:43,870
Na kanuni ni kweli kwenda kupata
kunyongwa ndani ya browser yako mwenyewe.

735
00:36:43,870 --> 00:36:46,560
Tu kufanya hili zaidi ya kweli,
hebu angalia hii katika fomu halisi.

736
00:36:46,560 --> 00:36:50,120
>> Sisi hatuna wazo nini kificho hii haina
bila kweli kusoma kwa njia hiyo.

737
00:36:50,120 --> 00:36:52,670
Lakini ngoja kwenda Facebook.com
bila magogo katika.

738
00:36:52,670 --> 00:37:00,440
Napenda kwenda Kukagua kipengele na kwenda,
hebu sema, Mtandao na Reload this Page.

739
00:37:00,440 --> 00:37:04,150
Na tutaweza see-- napenda kuhama Reload
Ukurasa kupata yote ya maombi kwa mwezi.

740
00:37:04,150 --> 00:37:08,850
Na ya kwanza kabisa
faili naona ni CSS, CSS.

741
00:37:08,850 --> 00:37:10,880
Hapa ni ya kwanza
JavaScript faili, na mimi kuwa

742
00:37:10,880 --> 00:37:14,600
sijui nini anafanya hivyo, lakini hapa
ni baadhi ya JavaScript kificho

743
00:37:14,600 --> 00:37:16,180
kwamba anatoa Facebook.

744
00:37:16,180 --> 00:37:18,400
Ni kweli hata kwamba
akifafanua kwa kuvuta.

745
00:37:18,400 --> 00:37:20,260
Ni bado tu kama nonsensical.

746
00:37:20,260 --> 00:37:24,341
>> Lakini utaona hata chini chini, kuna
hata zaidi ya haya files JavaScript.

747
00:37:24,341 --> 00:37:24,840
Whoops.

748
00:37:24,840 --> 00:37:25,440
Hiyo ni Ping.

749
00:37:25,440 --> 00:37:28,550
Hebu kwenda chini kidogo
zaidi, zaidi, zaidi.

750
00:37:28,550 --> 00:37:29,894
Kuna moja.

751
00:37:29,894 --> 00:37:31,238
Kuna moja.

752
00:37:31,238 --> 00:37:31,880
Kuna moja.

753
00:37:31,880 --> 00:37:35,820
>> Hivyo hata kama Facebook, nyuma ya
pazia, imeandikwa katika sehemu katika PHP

754
00:37:35,820 --> 00:37:39,100
na Facebook mwenyewe toleo yake,
kuna kiasi kubwa ya JavaScript.

755
00:37:39,100 --> 00:37:41,330
Kwa kweli, yoyote ya
kuzungumza kufanya kwenye Facebook,

756
00:37:41,330 --> 00:37:45,520
yoyote ya updates inline ratiba ya
kwamba kutokea katika muda halisi, yote ya kwamba

757
00:37:45,520 --> 00:37:47,944
inaendeshwa na JavaScript.

758
00:37:47,944 --> 00:37:48,444
Yeah?

759
00:37:48,444 --> 00:37:50,235
>> Watazamaji: Mimi nina uhakika
kama hii ni Facebook,

760
00:37:50,235 --> 00:37:53,624
lakini nilifikiri kwamba Facebook maendeleo
mwenyewe katika nyumba kificho lugha yao?

761
00:37:53,624 --> 00:37:54,540
DAVID Malan: Wao alifanya.

762
00:37:54,540 --> 00:37:58,110
Hivyo kwamba ni kwa nini nasema ugomvi wa
PHP aitwaye Hip Hop kwamba kweli

763
00:37:58,110 --> 00:38:03,440
aliongeza makala kwa vile kwamba wakati
Mark kwanza kutekelezwa Facebook,

764
00:38:03,440 --> 00:38:04,710
hiyo ilikuwa imeandikwa kwa PHP.

765
00:38:04,710 --> 00:38:07,370
Na kwamba aina ya imebakia
aina ya mbele Lugha mwisho

766
00:38:07,370 --> 00:38:09,030
kwamba wao kutumia kwa kiasi
ya coding zao, lakini ni

767
00:38:09,030 --> 00:38:11,870
haijawahi lugha hiyo
mizani hasa vizuri kwa mabilioni

768
00:38:11,870 --> 00:38:12,630
ya watu.

769
00:38:12,630 --> 00:38:15,300
Na hivyo aliongeza kuwa wao wenyewe
maboresho nyuma ya pazia.

770
00:38:15,300 --> 00:38:17,049
Na wao kutumia idadi yoyote
ya lugha nyingine

771
00:38:17,049 --> 00:38:19,170
kwa vipande mbalimbali ya
miundombinu yao.

772
00:38:19,170 --> 00:38:24,080
Hivyo ndiyo, ni ugomvi wa
nini sisi sasa kujua kama PHP.

773
00:38:24,080 --> 00:38:26,610
>> Basi hebu kuchukua kuangalia
katika mifano michache

774
00:38:26,610 --> 00:38:28,890
ya jinsi sisi wanaweza kutumia JavaScript hapa.

775
00:38:28,890 --> 00:38:32,530
Katika kanuni chanzo leo, tuna
rundo la files, ya kwanza ambayo,

776
00:38:32,530 --> 00:38:34,090
hebu aitwaye DOM sifuri.

777
00:38:34,090 --> 00:38:36,770
Hivyo DOM sifuri inaonekana kama ifuatavyo.

778
00:38:36,770 --> 00:38:40,730
Napenda kwenda katika saraka hii
na kufungua domzero.html,

779
00:38:40,730 --> 00:38:44,970
juu ya ambayo ina aina doc
tamko, akisema inakuja HTML 5.

780
00:38:44,970 --> 00:38:46,440
Na sasa hapa ni HTML tag.

781
00:38:46,440 --> 00:38:47,540
Hapa ni tag kichwa.

782
00:38:47,540 --> 00:38:49,210
Na hapa ni nini mpya leo.

783
00:38:49,210 --> 00:38:52,620
>> Sasa tuna tag script
ndani ya kichwa ya ukurasa.

784
00:38:52,620 --> 00:38:55,290
Na hii inaonekana gani
kidogo sana, lakini taarifa

785
00:38:55,290 --> 00:38:58,410
kwamba nimepata defined
script, JavaScript.

786
00:38:58,410 --> 00:39:01,050
Na kama kando, tangu hii
ni kawaida mbaya,

787
00:39:01,050 --> 00:39:05,220
JavaScript ina kitu kabisa
kufanya na Java, lugha

788
00:39:05,220 --> 00:39:08,010
kwamba baadhi yenu nguvu
wamejifunza katika APCS.

789
00:39:08,010 --> 00:39:10,480
Ilikuwa ni zaidi ya masoko
Jambo kuliko kitu chochote,

790
00:39:10,480 --> 00:39:12,980
wanaoendesha coattails ya miaka Java iliyopita.

791
00:39:12,980 --> 00:39:17,300
Lakini JavaScript, kitu cha kufanya na
Java, tu vile vile, na annoyingly,

792
00:39:17,300 --> 00:39:18,480
confusingly jina.

793
00:39:18,480 --> 00:39:21,890
>> Hivyo hapa ni jinsi gani ya kutangaza kazi
katika JavaScript, literally kusema kazi,

794
00:39:21,890 --> 00:39:24,556
basi jina la kazi,
basi yoyote hoja inaweza kuchukua,

795
00:39:24,556 --> 00:39:25,530
tu kama katika PHP.

796
00:39:25,530 --> 00:39:28,990
Zamu nje katika JavaScript, mmoja wa watu wengi
kazi annoying kwamba kuwepo ni Alert.

797
00:39:28,990 --> 00:39:31,392
Hii ni dirisha kidogo kwamba
mapenzi pop up na macho yenu

798
00:39:31,392 --> 00:39:32,600
kwa baadhi kipande cha habari.

799
00:39:32,600 --> 00:39:33,766
Ni kwa ujumla juu ya kipaji.

800
00:39:33,766 --> 00:39:35,980
Lakini tutaweza kutumia kama yetu
zoezi kwanza hapa.

801
00:39:35,980 --> 00:39:37,900
>> Taarifa makala chache ya JavaScript.

802
00:39:37,900 --> 00:39:41,524
Single quotes na quotes mbili
si kweli jambo tena.

803
00:39:41,524 --> 00:39:43,690
Single quotes na mbili
quotes inaweza kuwa interchanged,

804
00:39:43,690 --> 00:39:46,220
ambapo katika C, una kutumia
mara mbili quotes kwa masharti,

805
00:39:46,220 --> 00:39:48,150
na una mbili moja
ananukuu kwa chars.

806
00:39:48,150 --> 00:39:51,150
Katika dunia JavaScript,
watu wengi, watu wengi

807
00:39:51,150 --> 00:39:54,970
kutumia moja quotes karibu masharti
tu kwa sababu ni jambo Stylistic.

808
00:39:54,970 --> 00:39:58,330
Lakini nini pamoja operator hapa,
ambayo hatujaona kabla?

809
00:39:58,330 --> 00:39:59,836
>> Watazamaji: concatenation.

810
00:39:59,836 --> 00:40:00,960
DAVID Malan: concatenation.

811
00:40:00,960 --> 00:40:02,450
Hivyo C haina hata hii.

812
00:40:02,450 --> 00:40:04,820
PHP ina dot operator,
ambayo haina hii.

813
00:40:04,820 --> 00:40:09,710
JavaScript ina pamoja operator,
ambayo confusingly ni kama Java.

814
00:40:09,710 --> 00:40:11,440
Sasa nini kinaendelea hapa?

815
00:40:11,440 --> 00:40:14,260
>> Hivyo hapa ni ambapo msingi
uelewa wa picha kwamba

816
00:40:14,260 --> 00:40:17,010
sisi akatupa juu ya wanandoa
siku iliyopita anakuja katika kucheza.

817
00:40:17,010 --> 00:40:19,620
Kumbuka wakati tulikuwa rahisi
toleo la HTML page--

818
00:40:19,620 --> 00:40:20,830
ni tu alisema, hello dunia.

819
00:40:20,830 --> 00:40:22,770
Na kisha sisi waliochota mti
na haki, ambayo

820
00:40:22,770 --> 00:40:27,320
rundo la mistatili na mistari
kuunganisha yao kama mti familia.

821
00:40:27,320 --> 00:40:30,820
Hivyo hiyo ni kinachojulikana DOM
au Document Object Model.

822
00:40:30,820 --> 00:40:36,759
Na zinageuka kuwa unaweza kupata
mistatili katika mti na syntax

823
00:40:36,759 --> 00:40:37,550
kama yafuatayo.

824
00:40:37,550 --> 00:40:41,370
Wewe literally kusema hati, ambayo ni
maalum variable kimataifa katika JavaScript

825
00:40:41,370 --> 00:40:45,890
mpango kwamba ina kazi
yanayohusiana na hayo kwamba unaweza kupata

826
00:40:45,890 --> 00:40:50,280
sawa na struct, lakini wewe tu
kusema dot na kisha jina kazi ya,

827
00:40:50,280 --> 00:40:52,390
kupata kipengele kwa ID.

828
00:40:52,390 --> 00:40:55,460
>> kipengele Nataka kupata ni
inaonekana kunukuu jina unquote.

829
00:40:55,460 --> 00:40:57,150
Na kisha nataka kupata thamani yake.

830
00:40:57,150 --> 00:40:58,330
Sasa sisi ni kupata mbele ya sisi wenyewe.

831
00:40:58,330 --> 00:41:00,038
Mimi nina uhakika hata kile
yote hii ni kuhusu.

832
00:41:00,038 --> 00:41:03,000
Hebu mbele haraka kwa HTML juu ya
ukurasa, ambayo ni super rahisi.

833
00:41:03,000 --> 00:41:05,370
>> Taarifa kwamba nimepata defined
a kuunda chini hapa.

834
00:41:05,370 --> 00:41:07,940
Ilani nimekuwa kupewa ni ya kipekee
ID, ingawa tumekuwa si kutumika

835
00:41:07,940 --> 00:41:08,870
sifa hii kabla.

836
00:41:08,870 --> 00:41:11,300
Lakini hii ipo katika HTML.

837
00:41:11,300 --> 00:41:15,570
Unaweza kipekee kutambua baadhi chunk
ya HTML na kitambulisho kama hii.

838
00:41:15,570 --> 00:41:19,880
>> Ilani sasa this-- zamu nje HTML
inasaidia, kwa kuwa orodha ya kufulia

839
00:41:19,880 --> 00:41:22,490
wakati iliyopita, zima
rundo la tukio handlers.

840
00:41:22,490 --> 00:41:25,060
Na hii handler tukio anasema juu ya kuwasilisha.

841
00:41:25,060 --> 00:41:28,730
User kuwasilisha hii
fomu, piga kificho zifuatazo.

842
00:41:28,730 --> 00:41:31,360
Na kificho kwamba kinaendelea
kuitwa au kunyongwa

843
00:41:31,360 --> 00:41:35,260
ni hasa hii, Kigiriki
kazi na kufuatiwa na kurudi uongo.

844
00:41:35,260 --> 00:41:37,360
Kila kitu kingine lazima
kuwa pretty ukoo.

845
00:41:37,360 --> 00:41:42,050
>> Hapa ni pembejeo ya aina ya maandishi, ambaye
ID, katika kesi hii, ni kwenda kuwa na jina.

846
00:41:42,050 --> 00:41:45,430
Hatuna jina halisi sifa
time-- hii na kuwasilisha kifungo.

847
00:41:45,430 --> 00:41:48,330
Hivyo kusababisha ukurasa inaonekana kama hii.

848
00:41:48,330 --> 00:41:52,890
Na tabia kusababisha,
utaona, inaonekana kama hii.

849
00:41:52,890 --> 00:41:56,940
ukurasa ni mitaa majeshi anasema, hello
David, vigumu aesthetically kupendeza

850
00:41:56,940 --> 00:41:58,340
njia ya kusalimiana mtumiaji.

851
00:41:58,340 --> 00:41:59,950
Lakini nini hasa kinachoendelea?

852
00:41:59,950 --> 00:42:01,360
>> Naam, kufikiria nini hii ni.

853
00:42:01,360 --> 00:42:02,310
Hii ni uwanja maandishi.

854
00:42:02,310 --> 00:42:04,635
Na kwa mujibu wa
HTML hapa, nimekuwa kupewa ni

855
00:42:04,635 --> 00:42:07,350
kitambulisho kipekee
aitwaye kunukuu jina unquote.

856
00:42:07,350 --> 00:42:09,770
Wakati huo huo, nimekuwa alisema wakati
user ananyenyekea fomu hii

857
00:42:09,770 --> 00:42:13,820
kwa kupiga kuingia au kubonyeza Kuwasilisha
kifungo, piga kazi kuitwa Nisalimieni

858
00:42:13,820 --> 00:42:15,410
na kisha kurudi wa uongo.

859
00:42:15,410 --> 00:42:16,870
Hebu fikiria wale walio katika reverse.

860
00:42:16,870 --> 00:42:20,590
Taarifa wakati mimi click Kuwasilisha,
URL ya ukurasa huu haina mabadiliko.

861
00:42:20,590 --> 00:42:22,420
icon browser
hakuwa na kuanza inazunguka.

862
00:42:22,420 --> 00:42:27,050
Mimi si kwenda popote, na kwamba
halisi kwa sababu mimi alisema kurudi wa uongo.

863
00:42:27,050 --> 00:42:31,534
Kurudi Uongo short nyaya au vituo
tabia default wa fomu.

864
00:42:31,534 --> 00:42:33,700
Hivyo kwamba basi zinatuacha na
swali hili moja ya mwisho.

865
00:42:33,700 --> 00:42:34,764
Nini Nisalimieni nini?

866
00:42:34,764 --> 00:42:36,680
Naam, inaonekana Nisalimieni
wito kazi kuitwa

867
00:42:36,680 --> 00:42:39,250
Tahadhari, hupita katika moja
muda mrefu hoja kwamba

868
00:42:39,250 --> 00:42:43,950
matokeo ya concatenating pamoja
rundo la substrings, hello comma nafasi,

869
00:42:43,950 --> 00:42:45,810
basi chochote hii anarudi.

870
00:42:45,810 --> 00:42:51,490
Hivyo hati ni kama kimataifa
kutofautiana kwa kuwa mizizi ya mti huo,

871
00:42:51,490 --> 00:42:55,560
wito kazi maalum,
vinginevyo sasa inajulikana kama mbinu.

872
00:42:55,560 --> 00:42:57,650
kazi hiyo ni
ndani ya kutofautiana ni

873
00:42:57,650 --> 00:42:59,640
aitwaye njia badala ya kazi.

874
00:42:59,640 --> 00:43:01,570
>> Hivyo kupata kipengele kwa ID.

875
00:43:01,570 --> 00:43:03,940
Nini kipengele kufanya wewe
wanataka kupata na ID yake?

876
00:43:03,940 --> 00:43:06,970
Kunukuu jina unquote na
kisha hasa thamani.

877
00:43:06,970 --> 00:43:12,000
Hivyo kwa maneno mengine, kwamba kanuni tu
hupata uwanja maandishi ambao ID ni jina

878
00:43:12,000 --> 00:43:13,380
na kisha anapata thamani yake.

879
00:43:13,380 --> 00:43:16,460
Hivyo kama mimi walikuwa na mabadiliko ya hii
na kusema Davin badala ya Daudi,

880
00:43:16,460 --> 00:43:20,670
na click Kuwasilisha, sasa sisi
kuwa salamu kwa Davin.

881
00:43:20,670 --> 00:43:22,890
>> Haki wote, hivyo wote faini na nzuri.

882
00:43:22,890 --> 00:43:25,480
Lakini hebu angalia kama tunaweza kufanya
hii kidogo safi tangu tu

883
00:43:25,480 --> 00:43:28,190
kuandika code kama hii ni
ujumla kwenda kuwa juu ya kipaji.

884
00:43:28,190 --> 00:43:30,060
Hii ni kwenda kuangalia scarier.

885
00:43:30,060 --> 00:43:32,330
Lakini nini kwanza
tofauti kwamba wewe kumbuka hapa

886
00:43:32,330 --> 00:43:35,970
katika toleo hili badala
jina kubadilisha kwa DOM moja?

887
00:43:35,970 --> 00:43:41,110
Nini kimuundo inaonekana tofauti
kuhusu hili dhidi ya wengine?

888
00:43:41,110 --> 00:43:41,932
Yeah?

889
00:43:41,932 --> 00:43:43,890
Watazamaji: Je fomu juu ya
juu ya script sasa?

890
00:43:43,890 --> 00:43:46,570
DAVID Malan: Yeah, fomu ni juu
ya script kwa sababu baadhi curious.

891
00:43:46,570 --> 00:43:48,736
Hivyo kwamba ni jambo la kwanza
kwamba anaruka nje saa yangu, pia.

892
00:43:48,736 --> 00:43:50,990
Na nashiriki angalau,
sehemu hii ni kufanana.

893
00:43:50,990 --> 00:43:53,470
Hivyo kitu pekee ambayo inaonekana
kuwa tofauti ni hii.

894
00:43:53,470 --> 00:43:55,296
>> Hivyo hapa ni nini nadhifu
kuhusu JavaScript 2.

895
00:43:55,296 --> 00:43:57,420
Na inafanya ni vigumu
kuelewa katika mtazamo wa kwanza,

896
00:43:57,420 --> 00:44:00,670
hasa kwa ajili ya miradi ya mwisho kama
wewe ni kuangalia sampuli kificho online,

897
00:44:00,670 --> 00:44:04,200
lakini majipu chini baadhi
msingi kisintaksia makala.

898
00:44:04,200 --> 00:44:06,230
Hapa tena ni kwamba
kimataifa variable hati.

899
00:44:06,230 --> 00:44:09,540
Hapa tena ni kwamba njia au kazi
kwamba anasema kupata kipengele kwa ID.

900
00:44:09,540 --> 00:44:11,570
Wakati huu nataka
kupata ID aitwaye demo.

901
00:44:11,570 --> 00:44:12,490
Ambapo ni kwamba?

902
00:44:12,490 --> 00:44:15,400
Hiyo inaonekana haki
hapa, aina yenyewe.

903
00:44:15,400 --> 00:44:20,010
>> Na sasa taarifa kwamba inaonekana kama mimi
kupata nyuma kwamba nodi ya mti

904
00:44:20,010 --> 00:44:22,940
inawakilisha aina
yenyewe, si uwanja wa maandishi,

905
00:44:22,940 --> 00:44:26,970
zinageuka aina hiyo,
nodi au mstatili kutoka mti,

906
00:44:26,970 --> 00:44:30,450
ina nini tutaweza kuwaita mali,
sana, sana, sawa sana

907
00:44:30,450 --> 00:44:35,390
katika roho kwa struct katika C. Ni tu
mwanachama data ndani ya pembenne hii.

908
00:44:35,390 --> 00:44:38,300
>> Hivyo mimi nimepata aina
hapa, na mimi nina attaching,

909
00:44:38,300 --> 00:44:44,650
au mimi nina kumshirikisha, On wake Kuwasilisha
handler au tuseme On Kuwasilisha mali

910
00:44:44,650 --> 00:44:45,740
kazi zifuatazo.

911
00:44:45,740 --> 00:44:49,000
Na hii ni, kwa mbali, craziest
Jambo hivi sasa syntactically.

912
00:44:49,000 --> 00:44:53,610
Ni zinageuka katika JavaScript na katika
PHP, na kusema ukweli kwa jambo hilo katika C,

913
00:44:53,610 --> 00:44:58,990
ingawa sisi si kufanya hivyo, unaweza
kuongeza Nameless, majina, au AKA lambda

914
00:44:58,990 --> 00:45:03,000
kazi kwamba hawana jina
lakini anaweza kuitwa hata hivyo.

915
00:45:03,000 --> 00:45:07,050
>> Hivyo nini mimi kufanya hapa ni mimi nina kumshirikisha
On hii Kuwasilisha mali hiyo, ambayo

916
00:45:07,050 --> 00:45:14,330
ni ndani ya nodi hii ya DOM yangu mti,
kazi, kazi pointer kama wewe.

917
00:45:14,330 --> 00:45:16,310
Kazi ambayo hana
jina, lakini kwamba hana

918
00:45:16,310 --> 00:45:19,110
jambo kwa sababu tutaweza kuona
katika wakati jinsi ya simu yake.

919
00:45:19,110 --> 00:45:21,780
Wakati kazi hii ni wito,
kanuni hii anapata kunyongwa, basi

920
00:45:21,780 --> 00:45:24,210
uongo ni kurudi tu kama kabla.

921
00:45:24,210 --> 00:45:25,800
>> Lakini tazama kile mimi tumefanya.

922
00:45:25,800 --> 00:45:27,830
Katika hatua hii katika
hadithi, nina fomu.

923
00:45:27,830 --> 00:45:30,190
Ni got ID kipekee aitwaye demo.

924
00:45:30,190 --> 00:45:33,740
Chini hapa, nina tag script
kwamba executes kificho zifuatazo.

925
00:45:33,740 --> 00:45:37,720
Ni inaona kwamba nodi katika
mti ni On Kuwasilisha

926
00:45:37,720 --> 00:45:40,260
mali kazi hii hapa.

927
00:45:40,260 --> 00:45:44,310
Na tu na asili ya jinsi browsers kazi,
wakati mimi sasa bonyeza Kuwasilisha au hit Enter,

928
00:45:44,310 --> 00:45:45,889
kazi ambayo ni kwenda kupata kuitwa.

929
00:45:45,889 --> 00:45:48,680
Haina haja jina kwa sababu ambaye
heck anayejali nini ni kuitwa.

930
00:45:48,680 --> 00:45:52,540
wakati tu ni milele kwenda kupata
aitwaye ni wakati mimi kuwasilisha fomu.

931
00:45:52,540 --> 00:45:55,130
Hakuna haja kwa ajili yangu,
developer binadamu,

932
00:45:55,130 --> 00:45:57,330
kwa kweli kuiita mahali popote.

933
00:45:57,330 --> 00:46:00,720
>> Sasa tu kama teaser, kama kwamba
walikuwa si nia kupiga kutosha,

934
00:46:00,720 --> 00:46:03,330
tunaweza hata kufanya hii
kuangalia zaidi cryptic kutumia

935
00:46:03,330 --> 00:46:05,850
maktaba super maarufu aitwaye jQuery.

936
00:46:05,850 --> 00:46:08,760
Kwa kweli jQuery na JavaScript
mara nyingi alikataa.

937
00:46:08,760 --> 00:46:12,790
Na nini tutaweza kufanya juu ya Jumatano ni mwanzo
kutumia lugha hii na maktaba hizi

938
00:46:12,790 --> 00:46:16,030
kujenga inazidi Asynchronous
na maombi ya nguvu

939
00:46:16,030 --> 00:46:18,950
kama ramani ya kupata
maombi, maombi

940
00:46:18,950 --> 00:46:22,360
kwamba update tovuti katika mali
wakati, kiasi kama Facebook au Gchat

941
00:46:22,360 --> 00:46:27,130
kufanya, na hakuna tena tunajikita katika
kupiga Kuwasilisha na kupata au baada tu

942
00:46:27,130 --> 00:46:27,630
peke yake.

943
00:46:27,630 --> 00:46:29,055
Hivyo mimi kuona juu ya Jumatano.

944
00:46:29,055 --> 00:46:31,805

945
00:46:31,805 --> 00:46:35,550
>> [Music kucheza]

946
00:46:35,550 --> 00:48:09,728