1
00:00:00,000 --> 00:00:11,330

2
00:00:11,330 --> 00:00:12,360
>> DAVID Malan: All wa kulia.

3
00:00:12,360 --> 00:00:15,970
Hii ni CS50, na hii ni
mwishoni mwa wiki tisa.

4
00:00:15,970 --> 00:00:18,560
Imekuwa ni kimbunga juu ya
siku chache zilizopita.

5
00:00:18,560 --> 00:00:21,580
Na kuweka tatizo saba, kama wewe ni goti
kina ndani yake, kutambua kuna kabisa

6
00:00:21,580 --> 00:00:23,340
kidogo mpya kwamba huko.

7
00:00:23,340 --> 00:00:26,660
Lakini hebu angalia kama hatuwezi kipande
kila kitu pamoja hapa kwa ufupi

8
00:00:26,660 --> 00:00:29,230
kabla ya hapo veering mbali katika bado
mwelekeo na kuona mwingine

9
00:00:29,230 --> 00:00:30,510
mahali pengine ambapo tunaweza kwenda.

10
00:00:30,510 --> 00:00:32,630
>> Hivyo hivi sasa, tumekuwa kuongelea HTML.

11
00:00:32,630 --> 00:00:33,740
Tumekuwa kuongelea CSS.

12
00:00:33,740 --> 00:00:34,705
Tumekuwa kuongelea PHP.

13
00:00:34,705 --> 00:00:36,520
Umeingia kwa uzoefu SQL.

14
00:00:36,520 --> 00:00:38,360
Leo, tutaweza majadiliano kidogo
kuhusu JavaScript.

15
00:00:38,360 --> 00:00:41,230
Lakini jinsi kufanya haya yote tofauti
lugha fit pamoja?

16
00:00:41,230 --> 00:00:44,970
>> Hivyo sisi aliyesema wiki iliyopita kuhusu
kuwa wazo la server.

17
00:00:44,970 --> 00:00:48,470
Basi hebu tu kuteka pembenne hii
kama mtandao wa kompyuta hapa.

18
00:00:48,470 --> 00:00:52,200
Na mtandao wa kompyuta mtumishi hakika files.

19
00:00:52,200 --> 00:00:54,640
Na baadhi ya files wale
inaweza kuwa files HTML.

20
00:00:54,640 --> 00:00:58,270
Hivyo moja ya mambo ambayo mtandao wa kompyuta
unaweza mate nje inaweza kuwa faili kwamba

21
00:00:58,270 --> 00:01:01,290
tutaweza tu kuteka kama hii
zenye baadhi HTML.

22
00:01:01,290 --> 00:01:04,786
Hivyo katika suala layman, nini
haina HTML basi wewe kufanya?

23
00:01:04,786 --> 00:01:06,036
>> Watazamaji: Page kuangalia nzuri.

24
00:01:06,036 --> 00:01:09,670

25
00:01:09,670 --> 00:01:12,310
>> DAVID Malan: OK, kufanya ukurasa kuangalia nzuri,
ingawa nadhani nimepata kuthibitika

26
00:01:12,310 --> 00:01:13,370
kwamba vinginevyo.

27
00:01:13,370 --> 00:01:18,250
Hivyo HTML haina basi wewe kuweka kurasa
kimuundo, na utapata

28
00:01:18,250 --> 00:01:22,410
aina ya aesthetically alama juu ukurasa,
alama juu ya maudhui static, ili

29
00:01:22,410 --> 00:01:23,640
unaweza kisha kuona ni pamoja na mtandao wa browser.

30
00:01:23,640 --> 00:01:24,690
>> Lakini hiyo ni muhimu.

31
00:01:24,690 --> 00:01:26,130
Ni maudhui ya tuli.

32
00:01:26,130 --> 00:01:28,590
Wewe kuandika, wewe ila ni,
na kisha meli hiyo.

33
00:01:28,590 --> 00:01:31,130
Na mtandao wa kompyuta kisha mtumishi
it up kwa wageni wako.

34
00:01:31,130 --> 00:01:35,700
>> Lakini sisi stylize mambo kwa kutumia mbalimbali
lugha kabisa.

35
00:01:35,700 --> 00:01:40,150
Sisi kuanza kutumia style sifa
juu ya baadhi ya vitambulisho.

36
00:01:40,150 --> 00:01:43,400
Na style sifa hebu kuweka
mambo kama font ukubwa na rangi.

37
00:01:43,400 --> 00:01:46,460
Na ve pengine kuanza kugundua,
au hivi karibuni kwenu kwa ajili ya fainali

38
00:01:46,460 --> 00:01:50,160
miradi uwezekano, lakini wengine
mali kwamba unaweza kutumia katika CSS.

39
00:01:50,160 --> 00:01:54,710
Na hivyo katika suala layman, nini
kweli basi haina CSS nini?

40
00:01:54,710 --> 00:01:57,810
Wale ni mifano yake tu.

41
00:01:57,810 --> 00:02:00,730
Ni nini basi wewe kufanya hivyo HTML
haionekani kutokana na kile

42
00:02:00,730 --> 00:02:02,606
tumeona hivi sasa?

43
00:02:02,606 --> 00:02:04,850
>> Watazamaji: Kuainisha mitindo na wewe mwenyewe.

44
00:02:04,850 --> 00:02:06,700
>> DAVID Malan: Kuainisha mitindo
na wewe mwenyewe.

45
00:02:06,700 --> 00:02:10,280
Hivyo kufafanua mambo kama madarasa kama wewe
kuwa wamekutana, au kipekee

46
00:02:10,280 --> 00:02:13,800
kutambua nodes katika hati hivyo
kwamba unaweza stylize yao.

47
00:02:13,800 --> 00:02:16,890
Lakini zaidi hasa, ningesema kuwa CSS
kweli inakuwezesha kuchukua mambo

48
00:02:16,890 --> 00:02:20,790
mwisho mile na utapata bayana sana
usahihi zaidi aesthetics,

49
00:02:20,790 --> 00:02:24,340
ambapo HTML kwa sehemu kubwa lets
unaweza kupanga kurasa yako.

50
00:02:24,340 --> 00:02:27,310
>> Na hata ingawa kuna baadhi ya defaults,
kama tuliona tag kwa

51
00:02:27,310 --> 00:02:30,690
viongozi tag, ambayo takribani kusema
alifanya mambo makubwa na ujasiri.

52
00:02:30,690 --> 00:02:34,250
Hiyo ni ufafanuzi pretty generic
ya tag - kubwa na ujasiri.

53
00:02:34,250 --> 00:02:35,260
Nini font ukubwa ni kwamba?

54
00:02:35,260 --> 00:02:36,080
Rangi ni nini?

55
00:02:36,080 --> 00:02:36,890
Jinsi ujasiri ni kwamba?

56
00:02:36,890 --> 00:02:39,830
Na CSS inakuwezesha zaidi laini
tune mambo kama hayo.

57
00:02:39,830 --> 00:02:42,150
Kama vile layout, kama baadhi
ya umeona.

58
00:02:42,150 --> 00:02:45,180
>> Na kusema ukweli, CSS ni kidogo
ya lugha chafu.

59
00:02:45,180 --> 00:02:48,370
Ni nguvu sana katika kwamba unaweza kufanya
literally yoyote tovuti ya kuwa wewe wameweza

60
00:02:48,370 --> 00:02:51,880
kuonekana kwenye mtandao wa leo na hayo, lakini
ni aina ya maumivu ya shingo.

61
00:02:51,880 --> 00:02:54,440
Na baadhi yenu banged kichwa yako
dhidi ya kuta tayari tu kufanya

62
00:02:54,440 --> 00:02:58,560
kitu kijinga kama kituo cha orodha kwenye
kuweka tatizo saba kama wameweza kujipatia kwa

63
00:02:58,560 --> 00:02:59,470
kwamba hatua tayari.

64
00:02:59,470 --> 00:03:01,530
>> Lakini kutambua, mambo hayo
kupata rahisi baada ya muda.

65
00:03:01,530 --> 00:03:02,820
Kuanza kwa taarifa mwelekeo.

66
00:03:02,820 --> 00:03:06,020
Na tena, Google itakuwa rafiki yako
kwa njia mbalimbali ambazo unaweza

67
00:03:06,020 --> 00:03:07,220
kutatua aina hii ya matatizo.

68
00:03:07,220 --> 00:03:11,520
>> Na mimi kuthubutu kusema kwa CSS, na HTML zaidi
kwa ujumla, unaweza kutatua matatizo katika

69
00:03:11,520 --> 00:03:15,910
njia nyingi zaidi, ambayo yote nguvu sana
vizuri kuwa sahihi, kuliko unaweza

70
00:03:15,910 --> 00:03:18,900
katika kitu kama C, hata
sasa PHP, au JavaScript.

71
00:03:18,900 --> 00:03:21,080
Kuna watu wengi mbalimbali
njia ya kuweka mambo ya nje.

72
00:03:21,080 --> 00:03:22,570
>> Lakini jambo hili lilianza kupata
messy, sisi alisema.

73
00:03:22,570 --> 00:03:26,480
Tu aina ya commingling HTML yako na
CSS yako na style sifa mara

74
00:03:26,480 --> 00:03:27,590
kidogo sloppy.

75
00:03:27,590 --> 00:03:31,460
Na hivyo sisi badala alisema, aina ya
abstractly kuzungumza, kwamba ni lazima

76
00:03:31,460 --> 00:03:34,050
angalau kuanza kwa sababu
nje CSS yako pengine.

77
00:03:34,050 --> 00:03:37,430
Si style yako sifa, lakini angalau
kutumia tag style ndani ya kile

78
00:03:37,430 --> 00:03:38,840
sehemu ya ukurasa wa mtandao?

79
00:03:38,840 --> 00:03:39,560
>> Watazamaji: Mkuu.

80
00:03:39,560 --> 00:03:40,120
>> DAVID Malan: Katika kichwa.

81
00:03:40,120 --> 00:03:43,270
Hadi sasa, sisi tu alikuwa na cheo up
huko, lakini unaweza pia kuongeza style

82
00:03:43,270 --> 00:03:47,230
tag, na unaweza kuweka CSS yako takribani
kumtukana juu ya ukurasa.

83
00:03:47,230 --> 00:03:52,550
Lakini basi sisi alichukua mambo hatua moja zaidi
na sisi zitawekwa kuwa nje zaidi

84
00:03:52,550 --> 00:03:54,130
ndani ya faili tofauti.

85
00:03:54,130 --> 00:03:57,240
>> Na hivyo files hizi mbili walikuwa
namna fulani sasa wanaohusishwa.

86
00:03:57,240 --> 00:03:59,550
Na hakika ilikuwa
tag kwamba alifanya hivyo.

87
00:03:59,550 --> 00:04:02,920
Na nini alikuwa mmoja wa kuu
motisha kwa ajili ya factoring nje CSS wetu

88
00:04:02,920 --> 00:04:04,057
wote zaidi?

89
00:04:04,057 --> 00:04:05,280
>> Watazamaji: reusability.

90
00:04:05,280 --> 00:04:05,785
>> DAVID Malan: reusability.

91
00:04:05,785 --> 00:04:06,150
Haki?

92
00:04:06,150 --> 00:04:09,470
Unaweza tumeona katika p-kuweka saba tayari
kwamba mengi ya kurasa,

93
00:04:09,470 --> 00:04:12,260
kununua ukurasa, ukurasa kuuza,
kwingineko ukurasa, pengine ni

94
00:04:12,260 --> 00:04:13,550
muundo fulani vile vile.

95
00:04:13,550 --> 00:04:17,579
Kuna CS50 fedha alama juu
isipokuwa wameweza aliamua mabadiliko hayo.

96
00:04:17,579 --> 00:04:19,839
Kuna footer katika
chini ya kurasa.

97
00:04:19,839 --> 00:04:24,315
Na CSS utapata kisha na sababu nje
ndani faili tofauti ili kwamba kama

98
00:04:24,315 --> 00:04:27,780
unataka kubadilisha kitu duniani
katika tovuti yako yote, unaweza kweli

99
00:04:27,780 --> 00:04:29,390
tu mabadiliko hayo katika sehemu moja.

100
00:04:29,390 --> 00:04:32,750
>> Lakini kuna bei ya kulipa uwezekano wa
kwa kuwa na zitawekwa nje

101
00:04:32,750 --> 00:04:38,380
CSS kutoka HTML faili yangu katika tofauti
faili inayozungumzia ni pamoja na

102
00:04:38,380 --> 00:04:40,650
tag, ambayo tuliona siku ya Jumatatu.

103
00:04:40,650 --> 00:04:43,850
Nini kinaweza kuwa upande wa chini ya hili?

104
00:04:43,850 --> 00:04:48,830
Kufikiri nyuma wiki iliyopita wakati tuko
kuzungumza juu ya HTTP na TCP / IP na jinsi

105
00:04:48,830 --> 00:04:52,070
hisa kazi.

106
00:04:52,070 --> 00:04:53,530
Kitu zaidi ya hapa?

107
00:04:53,530 --> 00:04:54,730
>> Watazamaji: Inachukua muda zaidi.

108
00:04:54,730 --> 00:04:55,470
>> DAVID Malan: Inachukua muda zaidi.

109
00:04:55,470 --> 00:04:56,750
Kwa nini?

110
00:04:56,750 --> 00:04:59,450
>> Watazamaji: [inaudible].

111
00:04:59,450 --> 00:04:59,750
>> DAVID Malan: Yeah.

112
00:04:59,750 --> 00:05:01,240
Hivyo ni arguably inachukua kidogo muda zaidi.

113
00:05:01,240 --> 00:05:04,290
Kwa sababu moja, CSS ni wazi
si katika faili moja.

114
00:05:04,290 --> 00:05:06,920
Hivyo sasa una kufanya si
moja, lakini wawili maombi.

115
00:05:06,920 --> 00:05:11,230
Na kila moja ya maombi ya wale kama tulivyoona katika
Chrome katika Inspekta kinachojulikana,

116
00:05:11,230 --> 00:05:15,740
na sisi inaonekana katika tabo mtandao, kila
ya wale files inahitaji moja HTTP

117
00:05:15,740 --> 00:05:18,360
ombi, ambayo tuliona inachukua
baadhi ya kiasi cha muda.

118
00:05:18,360 --> 00:05:19,290
Sasa, labda siyo mengi.

119
00:05:19,290 --> 00:05:20,670
Labda ni 20 tu milliseconds.

120
00:05:20,670 --> 00:05:22,260
Labda ni 200 milliseconds.

121
00:05:22,260 --> 00:05:25,530
>> Lakini kufikiri kuhusu ukurasa kama Facebook,
au CNN, au Google, ambayo ni kiasi

122
00:05:25,530 --> 00:05:28,060
kubwa kuliko mifano tumekuwa
inaonekana katika hivi sasa.

123
00:05:28,060 --> 00:05:32,070
Wale kurasa wanaweza kuwa na kadhaa wa files,
ambayo kila mmoja anaweza kuhitaji

124
00:05:32,070 --> 00:05:33,550
download ya faili.

125
00:05:33,550 --> 00:05:35,800
Hivyo mambo unaweza uwezekano
kuanza polepole chini.

126
00:05:35,800 --> 00:05:39,280
>> Na hasa siku hizi wakati sisi wote
kuwa na simu za mkononi katika mifuko yetu na

127
00:05:39,280 --> 00:05:43,010
polepole internet connections, kuwa na
kusubiri chache milisekunde zaidi, ni wachache

128
00:05:43,010 --> 00:05:46,110
zaidi milisekunde kwa ziada
files kweli anaweza polepole.

129
00:05:46,110 --> 00:05:50,430
Latency ni neno linaloelezea
aina ya kusubiri kwamba una kwamba wewe

130
00:05:50,430 --> 00:05:53,110
uzoefu wakati wakisubiri
baadhi ya kipande cha habari.

131
00:05:53,110 --> 00:05:54,430
>> Lakini kuna suala la mafanikio.

132
00:05:54,430 --> 00:05:56,600
Hivyo si kila aina ya -

133
00:05:56,600 --> 00:05:58,170
ni kweli ni kidogo ya seesaw hapa.

134
00:05:58,170 --> 00:06:02,970
Upande wa chini sasa, lakini kile browsers wanaweza kufanya
kama uko smart ili kuepuka

135
00:06:02,970 --> 00:06:08,870
baada ya kuomba styles.css huo
faili tena unaweza kuwa kufanya nini?

136
00:06:08,870 --> 00:06:09,390
>> Cache yake.

137
00:06:09,390 --> 00:06:10,370
Hivyo Caching -

138
00:06:10,370 --> 00:06:11,690
C-A-C-H-E -

139
00:06:11,690 --> 00:06:15,810
ujumla maana hapa tu kuokoa
kuwasilisha ombi mara ya kwanza, na

140
00:06:15,810 --> 00:06:17,440
kisha kuangalia cache yako kwa ajili yake.

141
00:06:17,440 --> 00:06:20,400
Angalia wewe ni aina ya kuhifadhi kontena,
na ikiwa tayari

142
00:06:20,400 --> 00:06:24,520
nakala ya styles.css, hata kama baadhi ya wengine
ukurasa katika kuweka p-, au tovuti,

143
00:06:24,520 --> 00:06:28,560
maombi yake tena, tu kutoa
user kwamba huo cached nakala.

144
00:06:28,560 --> 00:06:30,140
Wala bother kuomba yake.

145
00:06:30,140 --> 00:06:32,560
>> Upande wa chini huko, ingawa, kama baadhi yenu
kuwa tripped zaidi katika kuweka p-.

146
00:06:32,560 --> 00:06:35,870
Kama wewe kufanya mabadiliko ya server na
wewe kwenda nyuma ya browser na wewe

147
00:06:35,870 --> 00:06:39,250
Reload, wakati mwingine browser gani
ninyi neema na haina bother

148
00:06:39,250 --> 00:06:43,660
re-kushusha faili yako styles.css
kwa sababu, kuja juu, ni nini tabia mbaya

149
00:06:43,660 --> 00:06:47,620
kwamba hizi mitindo kwamba anatumia Facebook
ni kwenda na mabadiliko ya saa moja na saa moja au

150
00:06:47,620 --> 00:06:48,140
siku kwa siku?

151
00:06:48,140 --> 00:06:48,800
Ni pretty chini.

152
00:06:48,800 --> 00:06:52,260
Wapate mabadiliko ya muda, lakini si
kwa dakika moja au kwa saa.

153
00:06:52,260 --> 00:06:55,810
>> Hivyo hila, tu FYI wakati wa kufanya mtandao
maendeleo, ni mara nyingi kushikilia chini

154
00:06:55,810 --> 00:06:59,500
kuhama muhimu kwa mfano na kisha bonyeza
Reload katika browser yako, na kwamba mapenzi

155
00:06:59,500 --> 00:07:03,280
kawaida kuwaambia Reload browser
kila kitu, hata kama tayari una

156
00:07:03,280 --> 00:07:04,180
katika cache.

157
00:07:04,180 --> 00:07:06,630
Hivyo tena, upsides na downsides,
lakini wote

158
00:07:06,630 --> 00:07:08,260
hatimaye kubuni maamuzi.

159
00:07:08,260 --> 00:07:11,520
>> Hivyo sasa, sisi alifanya si tu
kukomesha hadithi hapa.

160
00:07:11,520 --> 00:07:15,790
Kama mimi sasa kurudi nyuma na na nyuma na nyuma
nyuma, sisi ilianza kwa kuanzisha si tu

161
00:07:15,790 --> 00:07:18,060
HTML, lakini PHP.

162
00:07:18,060 --> 00:07:20,786
Hivyo katika suala layman, nini
haina PHP tufanye?

163
00:07:20,786 --> 00:07:22,770
>> Watazamaji: [inaudible].

164
00:07:22,770 --> 00:07:24,258
>> DAVID Malan: Ni nini hiyo?

165
00:07:24,258 --> 00:07:25,250
>> Watazamaji: Kuanzisha mantiki
katika kanuni.

166
00:07:25,250 --> 00:07:26,620
>> DAVID Malan: Yeah, kuanzisha
mantiki katika kanuni yako.

167
00:07:26,620 --> 00:07:29,570
Hivyo ni kweli programu lugha
na tanzi, na vigezo, na

168
00:07:29,570 --> 00:07:32,620
kazi, na hali, na wote wa
mambo tumekuwa kutumia njia ya nyuma

169
00:07:32,620 --> 00:07:33,780
wakati tangu mwanzo.

170
00:07:33,780 --> 00:07:36,780
Na PHP, tumeona, inaweza kutumika
aidha katika mstari amri - ni

171
00:07:36,780 --> 00:07:39,190
hana na kitu cha kufanya
na mtandao, hata kama hiyo ni

172
00:07:39,190 --> 00:07:43,150
kweli asili yake na nini inaelekea
kuwa nzuri saa na mazingira mazuri ya -

173
00:07:43,150 --> 00:07:47,130
lakini unaweza kutumia PHP tu kwa asili
ya ukweli kuwa ina magazeti ()

174
00:07:47,130 --> 00:07:49,660
kazi, na printf () kazi,
au mwangwi () kazi.

175
00:07:49,660 --> 00:07:52,440
Kuna mashada ya njia ya
unaweza magazeti asilia na PHP.

176
00:07:52,440 --> 00:07:56,540
>> Kwa hiyo, unaweza kutumia programu hii
lugha kwa pato hasa

177
00:07:56,540 --> 00:07:58,460
nini tunachozungumzia kabla.

178
00:07:58,460 --> 00:08:01,360
Unaweza dynamically kuzalisha
yako HTML.

179
00:08:01,360 --> 00:08:02,300
Labda si yote.

180
00:08:02,300 --> 00:08:06,460
Labda wewe ngumu kanuni mambo, kama
header, na footer, na alama,

181
00:08:06,460 --> 00:08:07,950
na style yako shuka,
na wote ya kwamba.

182
00:08:07,950 --> 00:08:11,190
Lakini kwa ajili ya kitu kama p-seti saba,
ambapo wewe ni kufanyia hifadhi na

183
00:08:11,190 --> 00:08:14,690
kuonyesha kwingineko mtumiaji, ambayo ni
kwenda dynamically mabadiliko, unaweza

184
00:08:14,690 --> 00:08:18,960
Hakika kutumia PHP na mantiki anatoa
wewe kama lugha ya programu ya

185
00:08:18,960 --> 00:08:22,320
pato dynamically subsets
ya ukurasa.

186
00:08:22,320 --> 00:08:25,900
>> Hivyo wakati wewe majadiliano juu ya Nje nguvu,
au mtandao programu, hiyo ni

187
00:08:25,900 --> 00:08:27,200
nini wewe kweli kuzungumza juu.

188
00:08:27,200 --> 00:08:31,450
Kutumia lugha kama PHP, au mambo
kinachoitwa chatu, au Ruby, au Java, au

189
00:08:31,450 --> 00:08:35,900
bado lugha nyingine, na swala database
mara nyingi, au nyingine server, na

190
00:08:35,900 --> 00:08:38,580
kisha dynamically mate nje ya HTML.

191
00:08:38,580 --> 00:08:42,470
>> Sasa matokeo ya mwisho, kama kando, ni
kwamba HTML ya Nje wengi,

192
00:08:42,470 --> 00:08:45,970
ikiwa ni pamoja na yako p-seti saba, pengine ni
kwenda kuwa fujo kubwa kama

193
00:08:45,970 --> 00:08:48,060
ukiangalia chanzo
kanuni katika browser.

194
00:08:48,060 --> 00:08:49,010
Hiyo si kubwa mpango huo.

195
00:08:49,010 --> 00:08:51,550
Katika hatua hii, wakati sisi huduma ya juu
style, sisi huduma ya juu

196
00:08:51,550 --> 00:08:52,740
stuff kwamba kuandika.

197
00:08:52,740 --> 00:08:56,240
Sisi si huduma kuhusu mambo
kwamba kile code yako mazao.

198
00:08:56,240 --> 00:08:59,520
Hivyo msiwe na wasiwasi kuhusu anatengeneza
hapa kama ni PHP kwamba

199
00:08:59,520 --> 00:09:01,190
kweli outputting mambo ya ajabu.

200
00:09:01,190 --> 00:09:04,430
Baada ya yote, browser si huduma,
na binadamu si kuangalia

201
00:09:04,430 --> 00:09:05,400
kwenye chanzo anyway.

202
00:09:05,400 --> 00:09:09,000
Sisi wafanyakazi, kwa mfano, ingekuwa
kuwa na kuangalia PHP yako.

203
00:09:09,000 --> 00:09:13,440
>> Hivyo basi mimi kutoa mfano wa haraka sasa
ya kwa nini mwingine hii inaweza kuwa na manufaa.

204
00:09:13,440 --> 00:09:18,620
Hivyo kusema ukweli, siwezi kukumbuka mwisho
wakati mimi kutumika C kutatua tatizo katika

205
00:09:18,620 --> 00:09:19,620
ulimwengu wa kweli.

206
00:09:19,620 --> 00:09:22,330
Ilikuwa pengine katika shule ya kuhitimu wakati
Mimi zinahitajika kutumia lugha ambayo

207
00:09:22,330 --> 00:09:26,710
ilikuwa haki kiwango cha chini na kunipa
nafasi ya kufanya jambo juu sana

208
00:09:26,710 --> 00:09:30,720
maonyesho ya kweli ila kama CPU nyingi
mizunguko kama ningeweza, kwa sehemu kubwa

209
00:09:30,720 --> 00:09:33,990
kwa sababu mimi nilikuwa kwa kutumia data kubwa seti,
na kila mzunguko wa CPU kuhesabiwa.

210
00:09:33,990 --> 00:09:37,750
Na kusema ukweli, hata katika vitu kama simu
siku hizi na vifaa vingine

211
00:09:37,750 --> 00:09:39,910
ambapo huna kabisa kuwa kama kiasi
kumbukumbu na huna kabisa kuwa kama

212
00:09:39,910 --> 00:09:44,160
sana CPU, kutumia lugha kasi
bado ni rufaa.

213
00:09:44,160 --> 00:09:47,290
>> Lakini katika ulimwengu wa kweli, wakati wewe tu
unataka kutupa baadhi ya mpango pamoja ili

214
00:09:47,290 --> 00:09:50,340
kuchambua baadhi ya data, au umefanya zilizokusanywa
kundi zima la usajili kwa ajili ya

215
00:09:50,340 --> 00:09:53,330
baadhi ya kundi mwanafunzi na unataka sana
haraka aŭtomate barua pepe kutuma

216
00:09:53,330 --> 00:09:56,240
moja kwa moja kila mmoja wa wale
registret, utaenda kufikia kwa

217
00:09:56,240 --> 00:09:59,240
ngazi ya juu ya lugha
kuliko C hivyo kusema.

218
00:09:59,240 --> 00:10:04,060
Kitu kama PHP au chatu, au Ruby,
au wengine nusu kadhaa ambazo zipo

219
00:10:04,060 --> 00:10:04,550
siku hizi.

220
00:10:04,550 --> 00:10:07,200
Lakini wale watatu ni pengine
haki wengi trendy sasa.

221
00:10:07,200 --> 00:10:10,840
>> Na nini maana ya hii ni kwamba unaweza kufungua
hadi mhariri wa maandishi kama gedit au

222
00:10:10,840 --> 00:10:14,030
zaidi ya kitu kingine chochote na kisha kuanza tu
kuandika code bila kuwa na wasiwasi

223
00:10:14,030 --> 00:10:17,800
kuhusu kuandaa, bila ya kuwa na
kweli na wasiwasi juu ya usimamizi wa kumbukumbu,

224
00:10:17,800 --> 00:10:20,820
kuweka akilini kwamba ingawa kidogo
sloppiness hatimaye kuja nyuma

225
00:10:20,820 --> 00:10:24,790
bite wewe kama kuweka data anapata
kubwa au tatizo anapata kubwa.

226
00:10:24,790 --> 00:10:27,230
Lakini hii ina maana gani kwa
sisi ni yafuatayo.

227
00:10:27,230 --> 00:10:29,860
>> Hebu kwenda mbele na kukimbia Speller
kutoka tatizo kuweka sita.

228
00:10:29,860 --> 00:10:33,480
Hivyo hii ni yangu trie makao utekelezaji
kwamba mimi kutumika kwenye kubwa

229
00:10:33,480 --> 00:10:35,500
bodi ambapo mimi si walifanya vizuri.

230
00:10:35,500 --> 00:10:38,720
Tutaweza kurudi katika muda wa wiki na
kupitia upya wale ambao hawakuwa na kuishia atop

231
00:10:38,720 --> 00:10:40,430
kubwa bodi katika hotuba yetu ya mwisho.

232
00:10:40,430 --> 00:10:44,520
Lakini kwa sasa, napenda kwenda mbele na wa haki
kukimbia ufumbuzi wangu katika maandishi, na tutaweza kufanya

233
00:10:44,520 --> 00:10:48,460
King James Biblia, na hapa sisi kwenda.

234
00:10:48,460 --> 00:10:51,080
>> Hivyo wale wote ni wa eti
misspelled maneno nje ya

235
00:10:51,080 --> 00:10:52,240
King James Biblia.

236
00:10:52,240 --> 00:10:55,560
Na utekelezaji yangu alichukua
nusu ya pili katika jumla.

237
00:10:55,560 --> 00:10:58,270
Hivyo si mbaya sana juu ya hii
hasa kompyuta.

238
00:10:58,270 --> 00:11:01,540
Lakini kufikiria ni kiasi gani
Kanuni nilikuwa kuandika.

239
00:11:01,540 --> 00:11:02,880
Fikiria kiasi gani kanuni wewe alikuwa na kuandika.

240
00:11:02,880 --> 00:11:06,170
Fikiria saa ngapi wewe alitumia katika
D-ukumbi au Dorm yako au popote

241
00:11:06,170 --> 00:11:07,890
kweli coding juu kwamba ufumbuzi.

242
00:11:07,890 --> 00:11:11,850
>> Naam, kama mimi kwa kweli kuwa na kiwango cha juu
lugha kama PHP, kuchukua kumbuka ya

243
00:11:11,850 --> 00:11:13,350
nini siwezi kufanya hapa.

244
00:11:13,350 --> 00:11:16,410
Kwanza, tuseme kwamba hii ni badala
usambazaji yako code.

245
00:11:16,410 --> 00:11:17,790
Hii ni faili inayoitwa Speller.

246
00:11:17,790 --> 00:11:20,220
Ni inapatikana kama sehemu ya leo
usambazaji kanuni.

247
00:11:20,220 --> 00:11:22,670
Na mimi nina kwenda kupitisha mkono wangu saa zaidi
ya maelezo, lakini hii ni kweli

248
00:11:22,670 --> 00:11:25,500
mfano wa jinsi ya kuvutia
unaweza bandari lugha

249
00:11:25,500 --> 00:11:28,870
kama C juu ya PHP.

250
00:11:28,870 --> 00:11:33,420
Mimi literally kufunguliwa madirisha Nakala mbili,
moja na toleo yangu ya C ya speller.c,

251
00:11:33,420 --> 00:11:36,960
na mimi tu ya kuanza kutafsiri katika wangu
kichwa na PHP na kuandika ni nje kwa kutumia

252
00:11:36,960 --> 00:11:38,840
karibu sawa utendaji.

253
00:11:38,840 --> 00:11:40,100
>> Hivyo baadhi ya mambo haya ni tofauti.

254
00:11:40,100 --> 00:11:43,730
Tuliona mara ya mwisho kwamba PHP haina matumizi
ni pamoja na katika njia sawa kabisa.

255
00:11:43,730 --> 00:11:47,050
Ni matumizi ya kawaida zinahitaji, ingawa
pamoja gani zipo.

256
00:11:47,050 --> 00:11:50,330
Kufafanua ni tofauti kidogo kutoka
# Define katika C, lakini hiyo ni

257
00:11:50,330 --> 00:11:51,890
jinsi ya kufanya mara kwa mara.

258
00:11:51,890 --> 00:11:55,860
$ Argc zinageuka ipo katika PHP,
hivyo tumeona kwamba kabla.

259
00:11:55,860 --> 00:11:58,650
Hizi ni baadhi tu ya vigezo, wote wa
ambayo kuanza kwa ishara ya dola.

260
00:11:58,650 --> 00:12:00,590
Kumbuka haya ni rundo
ya pointi floating.

261
00:12:00,590 --> 00:12:03,970
>> Hivyo muda mrefu hadithi fupi, wewe ni kuwakaribisha kwa
flip kupitia hii kama curious, hii ni

262
00:12:03,970 --> 00:12:10,010
karibu uongofu line-kwa-line ya
C toleo la speller.c katika PHP.

263
00:12:10,010 --> 00:12:12,630
Na unaweza kufanya hivyo tena kwa
nusu dazeni lugha nyingine.

264
00:12:12,630 --> 00:12:14,910
>> Lakini nini kuvutia ni hii.

265
00:12:14,910 --> 00:12:16,910
Au nini kusema ukweli disheartening
ni hii.

266
00:12:16,910 --> 00:12:20,790
Hebu kwenda mbele na aina kuhusu
dictionary.php, na kudai kwamba mimi nina

267
00:12:20,790 --> 00:12:23,670
kwenda mbele na re-kutekeleza
tatizo kuweka sita hapa.

268
00:12:23,670 --> 00:12:27,530
>> Basi hebu kwanza kupendekeza kwamba katika hii
faili, ambao utatekelezwa katika

269
00:12:27,530 --> 00:12:30,550
PHP, hivyo basi mimi kufungua vitambulisho wangu kama hiyo.

270
00:12:30,550 --> 00:12:34,780
Napenda kutoa mwenyewe kimataifa
kutofautiana, $ kawaida anapata sifuri.

271
00:12:34,780 --> 00:12:36,710
Na mimi nina kwenda kutoa
mwenyewe meza hash.

272
00:12:36,710 --> 00:12:38,110
Mimi itabidi kutumia meza hash kwa jambo hili.

273
00:12:38,110 --> 00:12:42,070
Jinsi gani mimi kutangaza meza hash katika PHP?

274
00:12:42,070 --> 00:12:42,990
Kufanyika.

275
00:12:42,990 --> 00:12:43,980
OK.

276
00:12:43,980 --> 00:12:48,870
>> Hivyo wazi mabano mabano inawakilisha karibu
nini katika PHP, kama tumeona?

277
00:12:48,870 --> 00:12:51,850
safu, lakini safu ambayo inaweza
kuwa safu associative.

278
00:12:51,850 --> 00:12:54,320
safu associative ni
muundo wa data kwamba

279
00:12:54,320 --> 00:12:55,860
washirika funguo na maadili.

280
00:12:55,860 --> 00:12:59,430
>> Sasa katika rahisi numerically indexed
safu, wale funguo ni nini?

281
00:12:59,430 --> 00:13:02,250

282
00:13:02,250 --> 00:13:03,960
Sifuri, moja, mbili, tatu, haki?

283
00:13:03,960 --> 00:13:08,780
Umri wa shule ya mambo ya nyuma kutoka C. Lakini inaweza
pia kuwa na masharti kama foo, na bar,

284
00:13:08,780 --> 00:13:12,210
au Maxwell, au kamba hiyo.

285
00:13:12,210 --> 00:13:14,240
Ili niweze kujiinua kwamba
katika muda tu.

286
00:13:14,240 --> 00:13:17,550
>> Hebu kwenda mbele na kutangaza
kazi kama -

287
00:13:17,550 --> 00:13:19,020
hebu kufanya mzigo () kwanza.

288
00:13:19,020 --> 00:13:20,690
Hivyo kazi ya mzigo ().

289
00:13:20,690 --> 00:13:23,440
Na PHP ni tofauti kidogo katika kwamba
wewe literally aina ya kazi, lakini ninyi

290
00:13:23,440 --> 00:13:24,930
si aina aina ya kurudi.

291
00:13:24,930 --> 00:13:28,760
Mimi nina kwenda mbele na kusema kwamba
mzigo () kazi inapaswa kuchukua katika

292
00:13:28,760 --> 00:13:31,000
Hoja $ kamusi, tu
kama C toleo alivyofanya.

293
00:13:31,000 --> 00:13:32,510
Mimi nina kufanya kwamba kutoka kwa kumbukumbu.

294
00:13:32,510 --> 00:13:34,910
>> Na napendekeza kwamba mimi nina
kwenda kufanya hili.

295
00:13:34,910 --> 00:13:37,080
Mimi tu kwenda kufanya foreach.

296
00:13:37,080 --> 00:13:40,710
Mimi naenda kuwaita kazi kuitwa
file (), kupita katika jina la kwamba

297
00:13:40,710 --> 00:13:44,990
faili, ambayo ni kutofautiana
$ $ Kamusi kama neno.

298
00:13:44,990 --> 00:13:49,410
Na kisha ndani ya yangu kwa kitanzi hapa, mimi nina
kwenda mbele na kuhifadhi katika wangu

299
00:13:49,410 --> 00:13:57,440
$ Meza kwamba $ neno anapata kweli.

300
00:13:57,440 --> 00:13:57,918
Kufanyika.

301
00:13:57,918 --> 00:14:01,264
Oh, kusubiri.

302
00:14:01,264 --> 00:14:02,422
Kufanyika.

303
00:14:02,422 --> 00:14:02,760
OK.

304
00:14:02,760 --> 00:14:04,970
>> Hiyo ni mzigo () kazi
kusema katika PHP.

305
00:14:04,970 --> 00:14:05,865
Sasa, kwa nini kuwa kazi?

306
00:14:05,865 --> 00:14:07,010
Na mimi nina aina ya udanganyifu hapa.

307
00:14:07,010 --> 00:14:09,980
>> Kwa hiyo, moja, foreach tuliona
kwa ufupi mwisho wakati.

308
00:14:09,980 --> 00:14:13,680
Ni tu ina maana kwamba unaweza iterate juu ya
safu bila bothering na i

309
00:14:13,680 --> 00:14:16,150
na n na pamoja na plus, na yote hayo.

310
00:14:16,150 --> 00:14:21,350
Kamusi ni ya kweli jina la faili,
kitu kama kubwa au ndogo, mbili

311
00:14:21,350 --> 00:14:22,830
kamusi tulikuwa wakati wa mwisho.

312
00:14:22,830 --> 00:14:26,715
Picha ni kazi ambayo kufungua Nakala
file, husoma katika mstari kwa mstari, na

313
00:14:26,715 --> 00:14:29,840
mikono nyuma safu kubwa,
kila moja ya vipengele ambao ni

314
00:14:29,840 --> 00:14:31,340
line kutoka faili hilo.

315
00:14:31,340 --> 00:14:36,040
Ili mchanganyiko wa fopen, na
fread, na wakati kitanzi, na fclose,

316
00:14:36,040 --> 00:14:37,080
na yote hayo.

317
00:14:37,080 --> 00:14:40,150
Hatimaye, kama neno tu ina maana kwamba ni
variable mimi nina kwenda kupata

318
00:14:40,150 --> 00:14:41,890
juu ya kila iteration katika kitanzi hii.

319
00:14:41,890 --> 00:14:46,910
>> Hivyo katika muda mfupi, hii moja mjengo hapa ina maana
kufungua faili ambaye jina lake ni katika

320
00:14:46,910 --> 00:14:50,750
kamusi, kutofautiana, iterate juu ya
ni mstari kwa mstari, na kila wakati kupata

321
00:14:50,750 --> 00:14:54,290
line, duka katika variable kuitwa neno,
na kisha kufanya kitu kwa neno.

322
00:14:54,290 --> 00:14:55,280
Je, mimi unataka kufanya nini?

323
00:14:55,280 --> 00:14:58,110
Nataka kuweka neno katika hash yangu meza.

324
00:14:58,110 --> 00:15:00,860
>> Naam, siwezi kuweka kitu katika wangu
hash meza tu kama katika C

325
00:15:00,860 --> 00:15:02,140
kutumia mabano mraba.

326
00:15:02,140 --> 00:15:03,660
Hii ni jina kwa hash yangu meza.

327
00:15:03,660 --> 00:15:07,180
Mimi nina kwenda index ndani ya kwamba hash
meza katika eneo hili.

328
00:15:07,180 --> 00:15:08,920
Hivyo si mabano sifuri, si mabano moja.

329
00:15:08,920 --> 00:15:11,990
Mabano quote unquote kitu,
chochote neno kwamba ni.

330
00:15:11,990 --> 00:15:15,200
Na kama unaweza kuwa katika yako
hash kazi meza trie, wewe tu kuhifadhi

331
00:15:15,200 --> 00:15:17,650
ufanisi Boolean, inamuunga
au waziwazi.

332
00:15:17,650 --> 00:15:18,260
Kufanyika.

333
00:15:18,260 --> 00:15:20,000
Mimi nina kuhifadhi thamani ya kweli.

334
00:15:20,000 --> 00:15:23,150
>> Sasa kuna mambo kadhaa ya
Mimi kukata pembe hapa.

335
00:15:23,150 --> 00:15:27,720
Kitaalam, kuna kwenda kuwa
annoying mpya line, / n, mwishoni mwa

336
00:15:27,720 --> 00:15:28,820
kila ya maneno haya.

337
00:15:28,820 --> 00:15:31,770
Basi, mimi lazima pengine kuwaita PHP kazi
aitwaye Night (), ambayo itakuwa

338
00:15:31,770 --> 00:15:33,460
halisi kabisa Night kwamba mbali.

339
00:15:33,460 --> 00:15:35,020
Na mimi kwa kweli haja ya
kufanya kitu kingine moja.

340
00:15:35,020 --> 00:15:38,380
Mimi lazima pengine nyongeza ukubwa juu ya kila
iteration, hivyo mimi nina kuweka wimbo

341
00:15:38,380 --> 00:15:39,560
kimataifa ya ni nini.

342
00:15:39,560 --> 00:15:43,180
Na kusema ukweli, na hii ni moja ya
masuala stupider ya PHP, kama wewe ni

343
00:15:43,180 --> 00:15:46,950
kutumia variable kimataifa, unahitaji
kwa wazi kusema kwamba wewe ni.

344
00:15:46,950 --> 00:15:51,670
Hivyo nina kwenda kwa kweli aina katika dunia
$ Kawaida, kimataifa $ meza, na sasa

345
00:15:51,670 --> 00:15:52,690
kazi yangu ni kamili.

346
00:15:52,690 --> 00:15:57,475
>> Hivyo si kabisa kama rahisi kama kabla, lakini
pengine alichukua muda chini ya C

347
00:15:57,475 --> 00:15:58,220
version, labda?

348
00:15:58,220 --> 00:15:58,730
OK.

349
00:15:58,730 --> 00:16:00,390
>> Hivyo sasa hebu kufanya kuangalia () kazi.

350
00:16:00,390 --> 00:16:04,300
Hebu tuone kama hii angalau alichukua
masaa ya mwisho kwamba ilichukua sisi katika C. Hivyo

351
00:16:04,300 --> 00:16:06,500
napenda kwenda mbele na kutangaza
kuangalia kama kazi.

352
00:16:06,500 --> 00:16:09,070
Inachukua katika hoja neno, ambayo ni
atakuja kutoka Speller.

353
00:16:09,070 --> 00:16:13,410
Na mimi nina tu kwenda kuangalia kama
zifuatazo variable isset, meza

354
00:16:13,410 --> 00:16:18,400
bracket strtolower ya neno -

355
00:16:18,400 --> 00:16:20,590
hebu usawa yote ya mabano yangu -

356
00:16:20,590 --> 00:16:24,275
kisha kurudi kweli.

357
00:16:24,275 --> 00:16:27,020

358
00:16:27,020 --> 00:16:28,460
Mwingine -

359
00:16:28,460 --> 00:16:30,330
kwamba ilikuwa ngumu
sehemu ya mpango huu.

360
00:16:30,330 --> 00:16:31,940
Mwingine, kurudi uongo.

361
00:16:31,940 --> 00:16:32,630
Kufanyika.

362
00:16:32,630 --> 00:16:33,460
Hiyo ni kuangalia ().

363
00:16:33,460 --> 00:16:34,520
>> Sasa, kwa nini hii kazi?

364
00:16:34,520 --> 00:16:37,040
Naam, moja mimi kupita katika neno,
ambayo ni kamba.

365
00:16:37,040 --> 00:16:41,400
Mbili, mimi nina kuangalia ndani ya hash
meza, ambaye kuitwa $ meza.

366
00:16:41,400 --> 00:16:45,470
Mimi nina kulazimisha kwa Herufi za chini kwa wito
kazi sawa kabisa tolower () katika

367
00:16:45,470 --> 00:16:48,580
C, lakini hii haina neno zima,
si tabia moja.

368
00:16:48,580 --> 00:16:52,680
Na kama hiyo ni kuweka, kwa maneno mengine huko
ni thamani kuweka, kwa maneno mengine,

369
00:16:52,680 --> 00:16:54,880
kama ni kweli, basi ndiyo,
hii ni neno.

370
00:16:54,880 --> 00:16:56,530
Kwa sababu mimi kuiweka huko kwa mzigo ().

371
00:16:56,530 --> 00:16:59,100
Na kama sio, mimi nina kwenda na kurudi uongo.

372
00:16:59,100 --> 00:17:00,090
>> Sasa wengine ni rahisi.

373
00:17:00,090 --> 00:17:03,570
Kazi ya kawaida (), ni jinsi gani mimi kufanya hili?

374
00:17:03,570 --> 00:17:05,230
Mimi kimsingi kufanya kurudi $ kawaida.

375
00:17:05,230 --> 00:17:07,770
Lakini mimi kitaalam haja ya
jambo hili annoying.

376
00:17:07,770 --> 00:17:10,640
Na kwa kweli up kusikia, nilikuwa kukata
kona moja wengi mno.

377
00:17:10,640 --> 00:17:12,920
Mimi kwa kweli wanahitaji kufanya kimataifa $ meza.

378
00:17:12,920 --> 00:17:16,260
>> Lakini kwamba kuwa alisema, kupakua).

379
00:17:16,260 --> 00:17:17,380
Kupakua () ni ajabu.

380
00:17:17,380 --> 00:17:20,500
Kazi ipakuliwe ().

381
00:17:20,500 --> 00:17:23,990
Je, mimi unataka kutekeleza ipakuliwe ()?

382
00:17:23,990 --> 00:17:25,079
Kufanyika.

383
00:17:25,079 --> 00:17:25,450
OK.

384
00:17:25,450 --> 00:17:28,900
>> Hivyo kupakua (), usimamizi wa kumbukumbu ni
kabisa kuchukuliwa huduma ya kwa ajili yenu katika

385
00:17:28,900 --> 00:17:31,800
kitu kama PHP na mengi
lugha ngazi ya juu.

386
00:17:31,800 --> 00:17:32,600
Hivyo hii ni ya ajabu.

387
00:17:32,600 --> 00:17:36,080
Kama nini kuzimu hakuwa sisi alitumia siku za nyuma
wiki pamoja na nane juu ya C kuandika

388
00:17:36,080 --> 00:17:41,030
inaonekana kweli polepole, kwa kweli wakati
kuteketeza matatizo pamoja na mamia ya masaa

389
00:17:41,030 --> 00:17:42,530
ya kazi chini ya mikanda yetu?

390
00:17:42,530 --> 00:17:46,110
>> Naam, kwa jambo moja, hii inaweza kufanya kazi
nzuri kwa ajili ya programu ndogo.

391
00:17:46,110 --> 00:17:47,840
Ni hakika kwa kasi juu yangu
maendeleo ya muda.

392
00:17:47,840 --> 00:17:49,790
Lakini hebu angalia nini kinatokea
katika ulimwengu wa kweli.

393
00:17:49,790 --> 00:17:52,370
>> Hebu kwenda katika saraka hii
katika dirisha terminal.

394
00:17:52,370 --> 00:17:53,370
Kuna Speller.

395
00:17:53,370 --> 00:17:56,570
Na taarifa kama kando, na unaweza
kuwa wamekutana hii katika kuweka tatizo

396
00:17:56,570 --> 00:17:58,190
sita au kuweka tatizo saba.

397
00:17:58,190 --> 00:18:01,610
Huwezi madhubuti na
mwisho files PHP pamoja. php.

398
00:18:01,610 --> 00:18:05,250
Kama kuweka line kama kwamba moja ya kwanza katika
juu sana, kwamba line maalum

399
00:18:05,250 --> 00:18:10,980
ya syntax kwamba kimsingi ina maana kupata
mpango ujulikanao PHP na kuitumia

400
00:18:10,980 --> 00:18:12,270
kutafsiri faili hii.

401
00:18:12,270 --> 00:18:15,410
Basi sasa hakuna anayejua kwamba
Mimi kuendesha programu PHP.

402
00:18:15,410 --> 00:18:19,860
Siwezi kukimbia tu kana kwamba
walikuwa kitu ulioandaliwa katika C.

403
00:18:19,860 --> 00:18:20,650
>> Lakini hapa kitu.

404
00:18:20,650 --> 00:18:21,600
Kwa kweli, hebu kufanya hivyo tena.

405
00:18:21,600 --> 00:18:23,530
Dropbox/pset6 /.

406
00:18:23,530 --> 00:18:25,390
Kuna Speller.

407
00:18:25,390 --> 00:18:26,720
OK, sekunde 0.44.

408
00:18:26,720 --> 00:18:28,080
It got kasi wakati huu.

409
00:18:28,080 --> 00:18:29,745
>> Sasa hebu kwenda katika PHP version.

410
00:18:29,745 --> 00:18:43,070

411
00:18:43,070 --> 00:18:44,320
Nice kuwasiliana.

412
00:18:44,320 --> 00:18:50,830

413
00:18:50,830 --> 00:18:53,285
Lakini nadhani tu wakati kiasi gani
Mimi kuokolewa katika saa za ofisi.

414
00:18:53,285 --> 00:18:56,990

415
00:18:56,990 --> 00:18:57,790
OK.

416
00:18:57,790 --> 00:19:01,020
>> Hivyo sekunde 3.59, ambayo kwa kweli
haina sauti sahihi ama.

417
00:19:01,020 --> 00:19:03,710
Lakini hiyo ni kwa sababu hadithi muda mfupi,
wakati wewe ni uchapishaji nje kiasi kikubwa

418
00:19:03,710 --> 00:19:06,840
ya mambo ya screen, kwamba
yenyewe kupungua mambo chini.

419
00:19:06,840 --> 00:19:11,260
Nini kweli alichukua CPU katika
appliance mara 3.59 sekunde, katika

420
00:19:11,260 --> 00:19:15,260
Tofauti na C, ambayo alichukua 0.44
sekunde hivi karibuni.

421
00:19:15,260 --> 00:19:17,620
Hiyo ni kweli utaratibu wa
ukubwa tofauti.

422
00:19:17,620 --> 00:19:20,280
>> Hivyo ambapo ni bei ya kwamba kuja kutoka?

423
00:19:20,280 --> 00:19:21,790
Kwa nini ni polepole sana?

424
00:19:21,790 --> 00:19:24,220
Kwa nini PHP kufanya hivyo vibaya?

425
00:19:24,220 --> 00:19:25,242
Danielle?

426
00:19:25,242 --> 00:19:26,550
>> Watazamaji: Wewe si kweli
kutumia meza hash.

427
00:19:26,550 --> 00:19:27,710
>> DAVID Malan: Mimi si kweli
kutumia meza hash.

428
00:19:27,710 --> 00:19:28,760
Hivyo mimi aina ya alivyofanya.

429
00:19:28,760 --> 00:19:29,870
Hivyo ni safu associative.

430
00:19:29,870 --> 00:19:33,650
Uwezekano mkubwa zaidi kama watu katika PHP ni
kweli smart, walitumia chini ya

431
00:19:33,650 --> 00:19:39,520
Hood halisi hash meza kutekelezwa
katika kitu kama C au C + +.

432
00:19:39,520 --> 00:19:41,290
Lakini.

433
00:19:41,290 --> 00:19:42,760
Yeah.

434
00:19:42,760 --> 00:19:44,010
>> Watazamaji: [inaudible].

435
00:19:44,010 --> 00:19:46,690

436
00:19:46,690 --> 00:19:47,080
>> DAVID Malan: Yeah.

437
00:19:47,080 --> 00:19:50,780
Hivyo kila moja ya kazi niliandika sasa -
kwa kweli, unaweza kusema kwamba kwa mara nyingine tena

438
00:19:50,780 --> 00:19:51,480
kidogo kwa sauti?

439
00:19:51,480 --> 00:19:54,509
>> Watazamaji: Kila moja ya kazi ambayo
wewe ni pamoja na ina mengi zaidi kamili

440
00:19:54,509 --> 00:19:56,610
uwezo kuliko -

441
00:19:56,610 --> 00:19:57,550
>> DAVID Malan: Basi hiyo ni kweli sana.

442
00:19:57,550 --> 00:20:01,490
Kuna mengi zaidi Rudia kwamba sisi ni
si kweli kuona na kuelekeza tu juu ya

443
00:20:01,490 --> 00:20:03,730
dictionary.php, ambayo mimi tu aliandika.

444
00:20:03,730 --> 00:20:08,020
Kwa upande mwingine, kuna mkalimani nzima
kwenda kwa nyuma.

445
00:20:08,020 --> 00:20:12,040
Hakika, wakati mimi mbio mpango huu, ni
ilikuwa si mbio zeros ulioandaliwa na ndio

446
00:20:12,040 --> 00:20:14,290
iliyoundwa kwa ajili ya CPU yangu Intel.

447
00:20:14,290 --> 00:20:19,270
Badala yake, alikuwa akikimbia mstari kwa mstari
PHP kificho kwamba inaonekana hasa

448
00:20:19,270 --> 00:20:20,350
kama sisi typed.

449
00:20:20,350 --> 00:20:22,475
Na hivyo wakati wewe kutumia
kufasiriwa lugha, wewe

450
00:20:22,475 --> 00:20:23,850
kweli kufanya kulipa bei hii.

451
00:20:23,850 --> 00:20:27,010
Ni kwenda kuchukua muda wa kusoma
faili yako ya juu hadi chini, kushoto na

452
00:20:27,010 --> 00:20:30,740
haki, na kisha kutoa kila
kujipanga tena na tena.

453
00:20:30,740 --> 00:20:34,250
>> Sasa katika hali halisi, hasa kwenye mtandao,
unaweza kweli kasi ya mchakato huu

454
00:20:34,250 --> 00:20:38,660
na Caching matokeo ya
Kanuni PHP inatafsiriwa.

455
00:20:38,660 --> 00:20:41,640
Na kwamba inafanya hisia kwenye mtandao, kwa sababu
kama wewe si mmoja mtumiaji kama

456
00:20:41,640 --> 00:20:46,300
mimi hapa, lakini watumiaji 1,000 au 10,000, kisha
labda mara ya kwanza ni faili

457
00:20:46,300 --> 00:20:49,050
kupatikana ni mwepesi, lakini baada ya hapo
ni kwa kasi zaidi.

458
00:20:49,050 --> 00:20:51,000
>> Lakini hii pia, tena, ni biashara ya mbali.

459
00:20:51,000 --> 00:20:53,870
Na kwa ajili ya kitu kama takwimu za utafiti
kuweka, au hata kitu kubwa kama

460
00:20:53,870 --> 00:20:58,330
huu, watumiaji yako hatimaye
kuanza kuhisi kwamba kushuka.

461
00:20:58,330 --> 00:21:02,670
>> Hivyo katika muda mfupi, kufasiriwa lugha ni
sana katika Vogue, maarufu sana, na

462
00:21:02,670 --> 00:21:06,710
kusema ukweli pengine ni lugha wewe
lazima kufikia kwa wakati kutatua matatizo

463
00:21:06,710 --> 00:21:08,200
baadae CS50.

464
00:21:08,200 --> 00:21:12,720
Lakini kutambua ni kiasi gani wewe ni kweli
kuchukua kwa nafasi chini ya Hood

465
00:21:12,720 --> 00:21:15,910
kweli wale kadhaa iliyopita baada ya wiki katika hash
meza, na miti, na inajaribu,

466
00:21:15,910 --> 00:21:20,770
ambayo hutumiwa hatimaye kwa kweli
kutekeleza mambo kama mabano wazi,

467
00:21:20,770 --> 00:21:24,200
Mabano ya mraba, ambayo tunaweza sasa
shukrani kuchukua kwa nafasi.

468
00:21:24,200 --> 00:21:26,360
>> Hivyo hebu tuangalie sasa
katika muktadha huu mtandao.

469
00:21:26,360 --> 00:21:29,890
Na nilivyoeleza mara ya mwisho kwamba kuna
rundo la superglobals katika PHP kwamba

470
00:21:29,890 --> 00:21:32,490
si kweli husika
katika mstari amri.

471
00:21:32,490 --> 00:21:36,210
Wao ni muhimu zaidi katika mazingira ya
ya kutumia PHP katika mazingira mtandao.

472
00:21:36,210 --> 00:21:41,220
Hivyo mbio PHP juu ya mtandao wa kompyuta ili
kuzalisha mambo kama HTML.

473
00:21:41,220 --> 00:21:44,540
>> Na sisi akapiga saa $ _GET na $ _POST, na
hiyo ambapo moja ya watumiaji '

474
00:21:44,540 --> 00:21:49,100
pembejeo kuishia tu kama wewe kuwasilisha
kuunda na faili unaomalizika. php kwenye mtandao

475
00:21:49,100 --> 00:21:50,460
server kama appliance.

476
00:21:50,460 --> 00:21:53,310
Lakini hebu tutazame
$ _COOKIE Na $ _SESSION.

477
00:21:53,310 --> 00:21:56,670
>> Katika suala layman, ni nini kuki kama
wewe kuelewa ni katika mazingira ya

478
00:21:56,670 --> 00:21:58,220
kutumia mtandao?

479
00:21:58,220 --> 00:21:59,450
>> Watazamaji: Picha ya kompyuta.

480
00:21:59,450 --> 00:21:59,920
>> DAVID Malan: Yeah.

481
00:21:59,920 --> 00:22:03,500
Ni faili kwenye kompyuta ya mtumiaji
kupandwa na tovuti yoyote

482
00:22:03,500 --> 00:22:04,410
kutokea kwa kutembelea.

483
00:22:04,410 --> 00:22:07,334
Hivyo wakati wewe kwenda Facebook, wakati wa kwenda
kwa bankofamerica.com, wakati wa kwenda

484
00:22:07,334 --> 00:22:10,330
kwa google.com, wakati wa kwenda karibu yoyote
tovuti katika dunia siku hizi,

485
00:22:10,330 --> 00:22:14,850
ikiwa ni pamoja na cs50.net, kuki ni kupandwa
kwenye kompyuta yako, ambayo ni

486
00:22:14,850 --> 00:22:19,800
ama thamani ya kuhifadhiwa katika RAM katika yako
kompyuta katika kumbukumbu ya browser yako, au

487
00:22:19,800 --> 00:22:22,800
wakati mwingine kweli faili kuhifadhiwa
kwenye gari yako ngumu.

488
00:22:22,800 --> 00:22:26,960
>> Na nini kawaida kuhifadhiwa katika faili kwamba
si user name yako, si yako

489
00:22:26,960 --> 00:22:31,060
password, kawaida si kitu
nyeti isipokuwa tovuti si hivyo

490
00:22:31,060 --> 00:22:35,040
mzuri na usalama wao, lakini badala
ni kubwa kipekee kati ya kitambulisho

491
00:22:35,040 --> 00:22:35,680
mambo mengine.

492
00:22:35,680 --> 00:22:38,920
Ni kubwa random idadi kupanda juu yako
kompyuta lakini unaweza kufikiria kama

493
00:22:38,920 --> 00:22:42,740
aina ya muhuri virtual mkono kama kutoka
klabu au baadhi ya Hifadhi ya pumbao kwamba

494
00:22:42,740 --> 00:22:47,160
inaruhusu wafanyakazi, wamiliki wa kwamba
huduma, kukumbuka wewe ni nani.

495
00:22:47,160 --> 00:22:51,030
Hivyo kama kubwa ya simu random ni kama
12345678, ingawa hiyo ni wazi

496
00:22:51,030 --> 00:22:54,180
pia si random, kufikiri ya kwamba kama
mkono muhuri kwamba wakati wa ziara

497
00:22:54,180 --> 00:22:57,930
facebook.com kwa mara ya kwanza, wao
muhuri kwamba idadi juu ya mkono wako.

498
00:22:57,930 --> 00:23:01,510
Na kisha kwa sababu wewe kusema HTTP, unaweza
kuwa browser, na kwa sababu Facebook

499
00:23:01,510 --> 00:23:06,440
wazi anaongea huo kama mtandao
server, HTTP itifaki anasema kwamba

500
00:23:06,440 --> 00:23:09,930
wowote hatimaye kutembelea
facebook.com, kama ni ya pili

501
00:23:09,930 --> 00:23:13,560
baadaye, saa baadaye, hata siku ya pili,
hivyo muda mrefu kama una si wazi

502
00:23:13,560 --> 00:23:17,050
watumiaji nje, ambayo kwa ufanisi
ni kama kuosha mikono yako.

503
00:23:17,050 --> 00:23:20,280
HTTP inasema unapaswa sasa wako
mkono muhuri kila wakati

504
00:23:20,280 --> 00:23:22,020
kurudi kwa tovuti hiyo.

505
00:23:22,020 --> 00:23:24,390
>> Nini Facebook basi haina ni wao
kuangalia muhuri kwamba mkono na

506
00:23:24,390 --> 00:23:26,850
wanasema, oh, 123,456,789.

507
00:23:26,850 --> 00:23:30,260
Sijui katika mtazamo wa kwanza kwamba hii
ni David Malan katika Cambridge,

508
00:23:30,260 --> 00:23:34,690
Massachusetts, lakini wanaweza kuangalia yao
database na kusema, oh, mtu

509
00:23:34,690 --> 00:23:39,930
juu ambao kompyuta sisi kupandwa 123456789
ni David Malan kutoka Cambridge,

510
00:23:39,930 --> 00:23:40,440
Massachusetts.

511
00:23:40,440 --> 00:23:46,000
Hebu kuonyesha kuwa mtumiaji basi profile yake
ukurasa au Habari wake Feed.

512
00:23:46,000 --> 00:23:49,660
>> Lakini kuna tatizo hapa kama hii
ni jinsi ya mtandao kwa kweli kazi.

513
00:23:49,660 --> 00:23:51,390
Hebu tuangalie mfano wa haraka.

514
00:23:51,390 --> 00:23:55,190
Hebu kweli kwenda kusema facebook.com.

515
00:23:55,190 --> 00:23:58,130
Lakini kabla tunaweza kwenda huko, basi
mimi kwenda mbele na kufungua Chrome

516
00:23:58,130 --> 00:23:59,790
Mkaguzi chini hapa.

517
00:23:59,790 --> 00:24:01,140
Hebu tuangalie tab mtandao.

518
00:24:01,140 --> 00:24:06,020
Na sasa hebu kwenda mbele na aina
katika https://facebook.com.

519
00:24:06,020 --> 00:24:09,410
Na mimi nina kufanya kwamba ili kwamba hatuoni
yote ya maelekezo hayo na taka

520
00:24:09,410 --> 00:24:10,660
muda wa kutafuta njia ya wale.

521
00:24:10,660 --> 00:24:12,690
Hebu hit kuingia.

522
00:24:12,690 --> 00:24:13,130
>> Wote haki.

523
00:24:13,130 --> 00:24:14,580
Tunaona rundo zima la maombi.

524
00:24:14,580 --> 00:24:15,640
Iwafikie Facebook.

525
00:24:15,640 --> 00:24:16,930
Kuna rundo zima la files.

526
00:24:16,930 --> 00:24:19,290
Na hapa, kwa kutaja yangu ya
latency mara ya mwisho, hiyo ni

527
00:24:19,290 --> 00:24:21,240
mengi ya maombi HTTP.

528
00:24:21,240 --> 00:24:23,700
Lakini moja ya kwanza pengine ni
kuvutia zaidi.

529
00:24:23,700 --> 00:24:26,420
>> Basi hebu kitabu hapa chini, na
Mimi itabidi kuvuta katika pili.

530
00:24:26,420 --> 00:24:29,090
Hii ni kwenda kuwa aina ya
fujo, lakini hebu angalia.

531
00:24:29,090 --> 00:24:31,660
Picha ni kupeleka sisi
nzima rundo la mambo ya ajabu.

532
00:24:31,660 --> 00:24:33,490
>> Lakini Ho, ya kuvutia.

533
00:24:33,490 --> 00:24:37,880
Wao ni kupanda hata mmoja, lakini wanne
mkono mihuri kwenye mkono wangu hapa.

534
00:24:37,880 --> 00:24:40,400
Kuweka-cookie, Kuweka-cookie, kuweka-cookie,
kuweka-kuki.

535
00:24:40,400 --> 00:24:44,030
Na kuna makala chache hapa.

536
00:24:44,030 --> 00:24:46,170
Wote hao kutaja baadhi
aina ya kumalizika muda wake.

537
00:24:46,170 --> 00:24:50,090
Na inaonekana kama Facebook ni matumaini
kukumbuka mimi mpaka mwaka 2015.

538
00:24:50,090 --> 00:24:53,670
Hivyo kwamba ni labda wakati na ambayo
Mimi ni lazima logi nje au wao itabidi tu

539
00:24:53,670 --> 00:24:55,710
moja kwa moja kudhani mimi nina
si kuja nyuma.

540
00:24:55,710 --> 00:24:57,840
Hivyo kwamba ni kweli heshima
kiasi cha muda.

541
00:24:57,840 --> 00:24:59,170
>> Na kuna baadhi ya wengine
mambo kinachoendelea hapa.

542
00:24:59,170 --> 00:25:03,036
Kuki hii inaonekana kuwa nguvu
ilifutwa kwa kusema kuwa muda wake mwaka 1970

543
00:25:03,036 --> 00:25:04,460
kabla ya cookies kuwepo.

544
00:25:04,460 --> 00:25:06,510
Kwa hiyo kivinjari ni kwenda tu
kwa kudhani OK, hiyo ni kama

545
00:25:06,510 --> 00:25:07,910
kuosha mikono muhuri.

546
00:25:07,910 --> 00:25:11,240
>> Lakini sasa wakati browser yangu inafanya
ombi baadae -

547
00:25:11,240 --> 00:25:14,340
napenda kwenda mbele na kufanya hili
tena na Reload.

548
00:25:14,340 --> 00:25:18,170
Sasa basi mimi nyuma ya kitabu
juu ya ombi na kwenda chini

549
00:25:18,170 --> 00:25:20,760
hapa, ombi headers.

550
00:25:20,760 --> 00:25:21,390
Taarifa hii.

551
00:25:21,390 --> 00:25:25,280
Hivyo sasa nina chini si majibu headers,
lakini taarifa inasema headers ombi.

552
00:25:25,280 --> 00:25:29,220
Na taarifa kwamba browser yangu kama sehemu ya
ombi lake baada ya kupiga Reload ina

553
00:25:29,220 --> 00:25:32,780
alimtuma angalau zifuatazo
habari.

554
00:25:32,780 --> 00:25:34,670
Si kuweka-cookie, lakini kuki.

555
00:25:34,670 --> 00:25:38,750
Hivyo hii ni ya mstari, header HTTP hivyo
kusema, ambapo browser yangu ni aina

556
00:25:38,750 --> 00:25:43,340
ya bila kujua yangu ni kuwasilisha
mkono wangu kwa ajili ya ukaguzi wa Facebook.

557
00:25:43,340 --> 00:25:46,020
>> Basi hizi cookies inaweza kuwa
kutumika basi kwa nini?

558
00:25:46,020 --> 00:25:49,420
Kukumbuka wewe ni nani, au kukumbuka jinsi
mara nyingi tumekuwa huko, au

559
00:25:49,420 --> 00:25:50,280
kweli kitu.

560
00:25:50,280 --> 00:25:52,742
>> Hivyo hapa ni counter.php.

561
00:25:52,742 --> 00:25:53,780
Na napenda kuvuta font.

562
00:25:53,780 --> 00:25:58,380
Na kila wakati mimi Reload ukurasa huu, taarifa
ni kukumbuka mara ngapi

563
00:25:58,380 --> 00:25:59,250
Nimekuwa huko.

564
00:25:59,250 --> 00:26:00,570
Naam, si kwamba kuvutia kwamba wote.

565
00:26:00,570 --> 00:26:03,140
Hebu tu karibu kwamba tab,
na sasa hebu kwenda nyuma ya

566
00:26:03,140 --> 00:26:07,860
http://localhost/counter.php.

567
00:26:07,860 --> 00:26:08,970
>> Oh, hiyo ni ya kuvutia.

568
00:26:08,970 --> 00:26:10,960
Bado ikumbukwe, hata
ingawa mimi imefungwa tab.

569
00:26:10,960 --> 00:26:14,010
Na kusema ukweli, kama mimi karibu browser,
kama kutekelezwa katika njia ya haki, mimi

570
00:26:14,010 --> 00:26:18,950
bado anaweza kukumbuka kwamba mtumiaji hii ni
ambaye yeye au yeye ni mara ya kwanza, na

571
00:26:18,950 --> 00:26:22,840
mara moja tu mimi kwenda katika menyu ya Chrome, ambayo
juu hapa ni hapa, na kwenda

572
00:26:22,840 --> 00:26:25,990
Historia, na bonyeza Takwimu Inatafuta wazi,
kama baadhi yenu wanaweza kuwa katika

573
00:26:25,990 --> 00:26:33,050
siku za nyuma, basi tu mapenzi cookies zako
kweli kuwa ilifutwa wakati wa mtandao

574
00:26:33,050 --> 00:26:33,970
maendeleo.

575
00:26:33,970 --> 00:26:35,340
>> Hivyo, kama sisi kwenda -

576
00:26:35,340 --> 00:26:37,080
hebu karibu up gedit hapa.

577
00:26:37,080 --> 00:26:38,910
Na kama sisi kwenda sasa na faili hii.

578
00:26:38,910 --> 00:26:44,210
Hebu kwenda katika yetu
vhosts / localhost / umma, na napenda kufanya

579
00:26:44,210 --> 00:26:46,340
counter.php.

580
00:26:46,340 --> 00:26:48,350
Taarifa kwamba hii ni pretty
rahisi mpango.

581
00:26:48,350 --> 00:26:50,250
Ni tovuti pretty rahisi.

582
00:26:50,250 --> 00:26:51,770
>> Hivyo juu ya faili
ni maoni.

583
00:26:51,770 --> 00:26:54,930
Lakini hapa ni mstari mpya kuwa unaweza kufanya
tumeona tayari katika p-seti saba,

584
00:26:54,930 --> 00:26:56,000
session_start ().

585
00:26:56,000 --> 00:27:00,380
Hii ni mstari wa kanuni PHP kwamba
kimsingi anasema mtandao wa kompyuta, kufanya

586
00:27:00,380 --> 00:27:03,400
uhakika na muhuri wa mikono na kufanya
uhakika wa kuangalia mihuri mkono.

587
00:27:03,400 --> 00:27:06,810
Hiyo ni kwamba kila mstari gani, na ni
anafanya yote ya utaratibu huo kwa ajili yetu.

588
00:27:06,810 --> 00:27:09,510
Basi taarifa nimekuwa tu got
matawi mawili hapa.

589
00:27:09,510 --> 00:27:14,150
Kama kukabiliana ufunguo ndani ya hii
maalum wa kimataifa variable kuitwa

590
00:27:14,150 --> 00:27:18,010
_SESSION $ Ni kuweka - kwa maneno mengine,
kama kuna baadhi ya thamani pale -

591
00:27:18,010 --> 00:27:22,440
hebu kupata na kuhifadhi katika mitaa
variable kuitwa $ kukabiliana.

592
00:27:22,440 --> 00:27:27,000
Mwingine, hebu hawawajui $ kukabiliana
default thamani ya 0.

593
00:27:27,000 --> 00:27:30,320
>> Sasa hapa ni hali moja ya PHP kwamba
baraka na laana.

594
00:27:30,320 --> 00:27:32,080
PHP ni kidogo sloppy.

595
00:27:32,080 --> 00:27:35,160
Hivyo ambapo katika C, gani
wigo wa kukabiliana na wamekuwa

596
00:27:35,160 --> 00:27:36,725
hapa au hapa?

597
00:27:36,725 --> 00:27:39,270

598
00:27:39,270 --> 00:27:41,690
>> Ingekuwa funge
kwa wale braces curly.

599
00:27:41,690 --> 00:27:42,090
Nadhani nini?

600
00:27:42,090 --> 00:27:46,920
Katika PHP, ipo hata nje ya wale
curly braces, hapa, na hapa,

601
00:27:46,920 --> 00:27:49,120
na hapa, na hapa, na
hata chini chini.

602
00:27:49,120 --> 00:27:52,400
Hivyo mimi kusema hii ni baraka katika hisia
kwamba huna kufikiri kama

603
00:27:52,400 --> 00:27:54,070
ngumu kama tulivyofanya wiki iliyopita.

604
00:27:54,070 --> 00:27:56,880
Lakini pia ni kidogo ya laana kwa kuwa
hakuna jambo ambapo matumizi ya kutofautiana katika

605
00:27:56,880 --> 00:28:00,020
PHP, angalau katika mpango kama huu,
ni kupatikana kwa ajili ya kimataifa

606
00:28:00,020 --> 00:28:01,170
bora au mbaya.

607
00:28:01,170 --> 00:28:06,130
Hivyo kuwa na kukumbuka kwamba sasa
vigezo yako inaweza kuwa kisichojulikana.

608
00:28:06,130 --> 00:28:07,640
Unaweza kuwa hufafanuliwa yao mahali pengine.

609
00:28:07,640 --> 00:28:09,460
>> Lakini je, Mimi naenda kufanya hatimaye?

610
00:28:09,460 --> 00:28:13,160
Mimi nina kwenda kuhifadhi ndani ya kwamba kimataifa
kutofautiana kama thamani ya

611
00:28:13,160 --> 00:28:17,060
kukabiliana na muhimu matokeo ya
kufanya kukabiliana pamoja na 1.

612
00:28:17,060 --> 00:28:18,910
Hivyo hii ni hesabu
kwamba haina

613
00:28:18,910 --> 00:28:20,590
incrementation ya kukabiliana na kwamba.

614
00:28:20,590 --> 00:28:24,850
Na ukweli kwamba mimi nina kuhifadhi kwamba
thamani nyuma katika hapa ni njia ya

615
00:28:24,850 --> 00:28:29,970
kimsingi update database
kukumbuka kwamba mtumiaji 123456789 imekuwa

616
00:28:29,970 --> 00:28:31,010
hapa mara mbili.

617
00:28:31,010 --> 00:28:33,780
Na wakati mimi kufanya hivyo tena wakati mwingine mimi
upya ukurasa, ni kwenda kuangalia

618
00:28:33,780 --> 00:28:36,710
mkono wangu muhuri na kusema, oh,
mtumiaji 123456789 ina sasa

619
00:28:36,710 --> 00:28:38,410
hapa mara tatu.

620
00:28:38,410 --> 00:28:43,390
>> Na hivyo kile PHP na lugha sawa
ni kufanya kwa ajili yetu ni wao ni kuhesabia

621
00:28:43,390 --> 00:28:47,720
nje jinsi na wapi na kwa muda gani
kuhifadhi maadili katika hii maalum

622
00:28:47,720 --> 00:28:48,830
superglobal.

623
00:28:48,830 --> 00:28:52,750
Na hii superglobal wakati mwingine mimi
kutembelea ukurasa ni aina ya magically

624
00:28:52,750 --> 00:28:57,440
kabla ya wakazi, kujazwa na maadili ambayo
kulikuwa na mara ya mwisho alitembelea,

625
00:28:57,440 --> 00:29:02,310
kama kwamba alikuwa wa pili iliyopita, wiki
iliyopita, au mwaka 2013 na sasa tuko kuzungumza

626
00:29:02,310 --> 00:29:03,790
kuhusu mwaka 2015.

627
00:29:03,790 --> 00:29:07,600
PHP na utunzaji mtandao wa kompyuta
ya yote kwa ajili yenu.

628
00:29:07,600 --> 00:29:08,850
>> Watazamaji: [inaudible].

629
00:29:08,850 --> 00:29:11,900

630
00:29:11,900 --> 00:29:15,760
>> DAVID Malan: Vigezo katika PHP ni
kimsingi daima kimataifa kama wewe

631
00:29:15,760 --> 00:29:18,400
kutangaza yao ndani ya kazi,
na kisha wao ni ndani

632
00:29:18,400 --> 00:29:19,420
kazi tu.

633
00:29:19,420 --> 00:29:22,300
Lakini kwa sababu nimekuwa si imeandikwa yoyote
kazi, wao ni sasa kwa ufanisi

634
00:29:22,300 --> 00:29:25,090
kimataifa katika faili yangu yote hapa.

635
00:29:25,090 --> 00:29:26,040
>> Watazamaji: Je, kuna njia
kuwafanya ndani?

636
00:29:26,040 --> 00:29:28,470
>> DAVID Malan: Je, kuna yeyote
njia ya kuwafanya ndani?

637
00:29:28,470 --> 00:29:30,680
Tu kwa wrapping yao katika kazi.

638
00:29:30,680 --> 00:29:32,790
Ambayo katika toleo la karibuni la
PHP, unaweza kufanya hivyo kwa

639
00:29:32,790 --> 00:29:34,130
kazi bila majina.

640
00:29:34,130 --> 00:29:35,930
Lakini zaidi juu ya kwamba katika
mazingira ya JavaScript.

641
00:29:35,930 --> 00:29:37,260
Lakini jibu fupi ni no.

642
00:29:37,260 --> 00:29:40,888
jibu tena ni ndiyo.

643
00:29:40,888 --> 00:29:42,380
Nice.

644
00:29:42,380 --> 00:29:43,380
Jaribio nzuri swali.

645
00:29:43,380 --> 00:29:43,930
Sawa.

646
00:29:43,930 --> 00:29:47,760
>> Hivyo mwisho, ukurasa yenyewe ni
kweli pretty rahisi.

647
00:29:47,760 --> 00:29:51,470
Taarifa kwamba mara moja mimi exit PHP mode, kukumbuka
kwamba wote wa mambo haya chini

648
00:29:51,470 --> 00:29:53,700
chini ni kwenda tu kupata mate
nje ghafi ya browser.

649
00:29:53,700 --> 00:29:57,050
Ambayo ni mzuri, kwa sababu mimi unataka kutuma
user baadhi HTML, lakini mimi unataka

650
00:29:57,050 --> 00:29:59,140
kwa dynamically update kwamba HTML.

651
00:29:59,140 --> 00:30:03,930
Na njia moja siwezi kufanya hivyo ni aina
ya haraka sana kuacha nyuma katika PHP

652
00:30:03,930 --> 00:30:07,730
mode, matumizi ya bracket wazi swali alama
ishara sawa, na kisha thamani ya pato la

653
00:30:07,730 --> 00:30:08,650
ya kukabiliana.

654
00:30:08,650 --> 00:30:12,360
>> Au kama hii inaonekana kidogo cryptic, hii
ishara sawa ni kweli tu baadhi

655
00:30:12,360 --> 00:30:16,190
sukari Kiwango cha kisintaksia kwa hii
printf ($ counter).

656
00:30:16,190 --> 00:30:19,160
Lakini kusema ukweli, kwamba ni kidogo tu ugly
na kidogo annoying kwa aina.

657
00:30:19,160 --> 00:30:23,660
Hivyo PHP nicely sana inatoa kipengele hiki
ambapo unaweza tu kusema ni zaidi

658
00:30:23,660 --> 00:30:25,450
ufupi katika njia hiyo hiyo.

659
00:30:25,450 --> 00:30:26,940
>> Hivyo nini kinaendelea chini ya
kofia?

660
00:30:26,940 --> 00:30:31,210
Hebu haraka kuangalia katika mtandao
tab hapa kwa counter.php.

661
00:30:31,210 --> 00:30:35,090
Na napenda kwenda mbele na kwanza
hebu wazi cookies zako.

662
00:30:35,090 --> 00:30:38,670
Hebu kuvinjari data wazi tangu
mwanzo wa wakati.

663
00:30:38,670 --> 00:30:39,680
Sasa hebu kwenda nyuma zaidi ya hapa.

664
00:30:39,680 --> 00:30:41,340
Sasa hebu upya ukurasa.

665
00:30:41,340 --> 00:30:42,170
Na mimi nina nyuma katika sifuri.

666
00:30:42,170 --> 00:30:44,810
Kwa sababu mkono wangu muhuri imechukuliwa,
Mimi sasa kupata kuki mpya.

667
00:30:44,810 --> 00:30:48,780
>> Hakika kama mimi kuangalia tab mtandao na
kuangalia majibu headers, taarifa

668
00:30:48,780 --> 00:30:51,960
kwamba appliance ni kutuma mimi
cookie ambaye jina lake ni kiasi fulani

669
00:30:51,960 --> 00:30:55,820
kiholela, lakini aina ya
sababu, PHPSESSID.

670
00:30:55,820 --> 00:30:58,440
Na ni hii kutuma mimi kwa kweli
kubwa random idadi.

671
00:30:58,440 --> 00:30:59,440
Siyo kabisa idadi.

672
00:30:59,440 --> 00:31:00,390
Siyo hexadesimoli kabisa.

673
00:31:00,390 --> 00:31:03,600
Ni aina fulani ya kamba alphanumeric,
lakini labda ni random.

674
00:31:03,600 --> 00:31:06,830
Na kwamba ni mkono muhuri ili
kusema kwamba mimi nina akimaanisha.

675
00:31:06,830 --> 00:31:11,960
>> Wakati huo huo kama mimi bonyeza Reload na kisha
kuangalia line hii ya pili kwa ajili ya pili wangu

676
00:31:11,960 --> 00:31:17,600
ombi, taarifa sasa kwamba ombi langu
headers ni pamoja na PHPSESSID sawa na hii,

677
00:31:17,600 --> 00:31:19,390
si kuweka-cookie, lakini tu cookie.

678
00:31:19,390 --> 00:31:22,950
Na kwamba kuwasilisha browser yangu ya
mkono wangu muhuri.

679
00:31:22,950 --> 00:31:28,820
>> Hivyo sasa kama teaser, na tutaweza majadiliano zaidi
kuhusu hili katika wiki au hivyo, lakini

680
00:31:28,820 --> 00:31:31,590
katika njia gani hii kufanya
mazingira magumu, akaunti yako Facebook

681
00:31:31,590 --> 00:31:34,137
mazingira magumu, na mengine kama
akaunti mazingira magumu?

682
00:31:34,137 --> 00:31:35,510
>> Watazamaji: Kama mtu ana cookie yako.

683
00:31:35,510 --> 00:31:36,750
>> DAVID Malan: Yeah, kama mtu
ina cookie yako.

684
00:31:36,750 --> 00:31:39,920
I mean kweli, kama ilivyo kwa baadhi yenu
wanaweza wamejaribu katika kama klabu au

685
00:31:39,920 --> 00:31:44,030
Hifadhi ya pumbao, kama wewe kujaribu kitu
kama hii nakala muhuri, pamoja na

686
00:31:44,030 --> 00:31:47,560
nyuma kwenye mkono wa mtu mwingine,
na kisha yeye au yeye kumwakilisha kama

687
00:31:47,560 --> 00:31:53,250
yao wenyewe, kama ni kweli haina kuangalia
kufanana, 123456789, basi mtandao

688
00:31:53,250 --> 00:31:57,980
server ni inaonekana tu kwenda
kuamini kwamba user kwamba ni wewe.

689
00:31:57,980 --> 00:32:01,450
>> Na hii ni kweli ya msingi
tishio wakati wowote kutumia cookies

690
00:32:01,450 --> 00:32:05,420
kwa sababu kama mtu tu spoofs hivyo
kusema cookie yako, takwimu nje ni nini

691
00:32:05,420 --> 00:32:08,660
ni, ama kwa kweli kuiga
kwa kuangalia katika kompyuta yako

692
00:32:08,660 --> 00:32:09,890
na kuwa kama, OK.

693
00:32:09,890 --> 00:32:14,520
Cookie Daudi ni JJ3JIK na kadhalika,
na kisha wao ni smart kutosha kujua

694
00:32:14,520 --> 00:32:18,080
jinsi ya aina ya manually kutuma kwamba
cookie kutoka browser au kutoka

695
00:32:18,080 --> 00:32:22,350
mpango wao kuandika, wanaweza kabisa
kuingia katika tovuti kama wewe.

696
00:32:22,350 --> 00:32:28,560
Ni si kwamba ni vigumu kujifanya kuwa
mtu mwingine isipokuwa sisi kupitia upya p-kuweka

697
00:32:28,560 --> 00:32:30,790
mbili, ambayo ilianzisha nini?

698
00:32:30,790 --> 00:32:32,065
>> Watazamaji: Cryptography.

699
00:32:32,065 --> 00:32:33,860
>> DAVID Malan: kidogo
kidogo ya cryptography.

700
00:32:33,860 --> 00:32:36,550
Rahisi cryptography, angalau katika
toleo la kawaida, lakini crypto

701
00:32:36,550 --> 00:32:36,870
hata hivyo.

702
00:32:36,870 --> 00:32:37,410
chini.

703
00:32:37,410 --> 00:32:41,440
Hivyo ni zamu nje kama wewe fumbo yote ya
headers haya kwa kutumia kitu ambacho

704
00:32:41,440 --> 00:32:48,770
kusudi, sasa kwa kujua familiarly zaidi kama SSL,
safu ya soketi salama, au https:// URLs,

705
00:32:48,770 --> 00:32:51,890
kisha mambo yote haya tumekuwa
glancing katika ni kweli encrypted,

706
00:32:51,890 --> 00:32:54,800
ambayo ina maana kwamba ni kama wewe
hawawezi kusoma mkono muhuri.

707
00:32:54,800 --> 00:32:59,350
Tu facebook.com anaweza, au google.com,
au katika kesi hii, appliance unaweza

708
00:32:59,350 --> 00:33:00,550
kusoma mkono muhuri.

709
00:33:00,550 --> 00:33:04,020
>> Kwa bahati mbaya, ingawa, na tena, hii ni
zote zinazofaa pia kwa NSA mambo

710
00:33:04,020 --> 00:33:06,410
wa marehemu, hata SSL ni linaloweza.

711
00:33:06,410 --> 00:33:09,850
Na ni kweli si kwamba ni vigumu
hata ufa encryption hiyo.

712
00:33:09,850 --> 00:33:12,040
Sio sana kwa ngozi encryption,
lakini tricking na

713
00:33:12,040 --> 00:33:15,720
kisakuzi katika decrypting
data mapema.

714
00:33:15,720 --> 00:33:17,880
Lakini tena, tutaweza tease wewe
na kwamba kabla ya muda mrefu.

715
00:33:17,880 --> 00:33:21,242
Kwa sasa, tu kuwa na hofu.

716
00:33:21,242 --> 00:33:23,070
Ni hali ya kusikitisha aina ya kweli.

717
00:33:23,070 --> 00:33:23,760
>> Sawa.

718
00:33:23,760 --> 00:33:27,910
Hivyo, ambapo gani hii sasa kuondoka sisi?

719
00:33:27,910 --> 00:33:29,010
Naam, hebu kufanya hili.

720
00:33:29,010 --> 00:33:31,790
Hebu kwenda mbele na kuchukua haraka
teaser kabla ya sisi kuchukua mapumziko.

721
00:33:31,790 --> 00:33:33,790
Na nadhani tutaweza msiweke kidogo tena
leo, lakini sisi ni kwenda kupiga mbizi katika

722
00:33:33,790 --> 00:33:37,850
kitu bidhaa mpya na sexy, ambayo itakuwa
noa hamu yako kwa hata zaidi.

723
00:33:37,850 --> 00:33:38,950
Hivyo kwamba ni teaser.

724
00:33:38,950 --> 00:33:41,520
>> Hivyo SQL, sisi kuanza kuzungumza juu ya
milele hivyo kwa ufupi mwisho wakati.

725
00:33:41,520 --> 00:33:44,670
Itabidi kweli kupata mikono yako chafu
na baadhi ya kuwa katika p-seti saba.

726
00:33:44,670 --> 00:33:46,480
Na katika suala layman, nini SQL -

727
00:33:46,480 --> 00:33:47,110
S-Q-L -

728
00:33:47,110 --> 00:33:49,850
kufanya kwa ajili yenu?

729
00:33:49,850 --> 00:33:50,310
Ni nini?

730
00:33:50,310 --> 00:33:51,546
Yeah.

731
00:33:51,546 --> 00:33:53,240
>> Watazamaji: Hebu wewe kupata data.

732
00:33:53,240 --> 00:33:53,360
>> DAVID Malan: Yeah.

733
00:33:53,360 --> 00:33:55,120
Ni hebu wewe kupata data
katika database.

734
00:33:55,120 --> 00:33:56,710
Uliza muundo lugha.

735
00:33:56,710 --> 00:33:59,890
Na hii ni kimsingi
programu ya lugha.

736
00:33:59,890 --> 00:34:03,400
Kuna makala ya kwamba
sisi si hata kutumia darasani.

737
00:34:03,400 --> 00:34:04,710
Lakini unaweza ufanisi
kufafanua majukumu.

738
00:34:04,710 --> 00:34:06,870
Wao ni kuitwa kuhifadhiwa
taratibu katika SQL.

739
00:34:06,870 --> 00:34:09,860
Lakini tutaweza kushika ni haki rahisi na wa haki
kuitumia kwa ajili ya shughuli za baadhi ya msingi

740
00:34:09,860 --> 00:34:14,320
kama kuchagua data, kuingiza data,
uppdatering data, na kufuta data.

741
00:34:14,320 --> 00:34:17,400
>> Na unaweza kweli nadhani wa database,
kama database SQL, kama tu

742
00:34:17,400 --> 00:34:18,800
kuwa Microsoft Excel.

743
00:34:18,800 --> 00:34:21,989
Sababu SQL inahusu kimahusiano
database, ambapo

744
00:34:21,989 --> 00:34:23,480
uhusiano tu ina maana meza.

745
00:34:23,480 --> 00:34:24,739
Safu na nguzo.

746
00:34:24,739 --> 00:34:27,929
Hivyo chochote unaweza kuweka katika spreadsheet
kama hii au Google Docs,

747
00:34:27,929 --> 00:34:32,460
unaweza kuweka katika database SQL
kwa kutangaza meza.

748
00:34:32,460 --> 00:34:34,800
>> Sasa, ni jinsi gani unaweza kweli kupata
kwamba habari?

749
00:34:34,800 --> 00:34:38,239
Naam, na amri au
maswali kama hii.

750
00:34:38,239 --> 00:34:40,199
CHAGUA, kuingiza, UPDATE, na Delete.

751
00:34:40,199 --> 00:34:44,489
Na kwa sehemu kubwa, wale ni
wanne tu viungo itabidi

752
00:34:44,489 --> 00:34:47,370
kufanya kitu kabisa nguvu
katika tatizo kuweka saba.

753
00:34:47,370 --> 00:34:49,940
>> Sasa nyuma katika siku, wewe ungekuwa kweli
kiutendaji na database katika

754
00:34:49,940 --> 00:34:52,730
nyeusi na nyeupe terminal dirisha
haraka blinking kama hii.

755
00:34:52,730 --> 00:34:56,370
Na database sisi ni mbio juu ya
appliance inaitwa MySQL, ambayo ni

756
00:34:56,370 --> 00:34:58,560
huru na ya chanzo database injini.

757
00:34:58,560 --> 00:35:02,240
Kama Google na kusoma Wikipedia
makala, itabidi kujua kwamba jina ni

758
00:35:02,240 --> 00:35:05,060
kidogo ya mpito kwa ajili ya baadhi ya
matoleo ya Linux.

759
00:35:05,060 --> 00:35:10,460
Maria database ni kweli
uma hivyo kusema ya MySQL.

760
00:35:10,460 --> 00:35:12,740
>> Muda mrefu hadithi fupi, Oracle kununuliwa MySQL.

761
00:35:12,740 --> 00:35:13,870
Oracle ni kampuni kubwa.

762
00:35:13,870 --> 00:35:17,010
Watu wamekuwa na wasiwasi kwamba ingekuwa
tena kubaki kabisa kama chanzo wazi,

763
00:35:17,010 --> 00:35:20,930
hivyo hii ni nakala ya MySQL kwamba
bado bure, bado wazi chanzo, na

764
00:35:20,930 --> 00:35:23,550
imewekwa katika Fedora Linux na default.

765
00:35:23,550 --> 00:35:26,130
>> Lakini hii ni aina ya maumivu katika
shingo ya kupata khabari na

766
00:35:26,130 --> 00:35:27,310
Mbegu njia hii.

767
00:35:27,310 --> 00:35:30,560
Hivyo sisi ni pamoja na katika appliance CS50
bure wazi chanzo chombo inayoitwa

768
00:35:30,560 --> 00:35:31,700
phpMyAdmin.

769
00:35:31,700 --> 00:35:33,940
Bahati mbaya tu kwamba
imeandikwa katika PHP.

770
00:35:33,940 --> 00:35:36,450
Hakuna msingi
haja kwa PHP hapa.

771
00:35:36,450 --> 00:35:40,090
Lakini hii ni chombo tu cha mtandao msingi kwamba
sisi kupakuliwa kwa bure, imewekwa katika

772
00:35:40,090 --> 00:35:43,850
appliance, ambayo inaruhusu yetu kuwa na
graphical user interface na ambayo

773
00:35:43,850 --> 00:35:48,610
kuchunguza p-seti saba database na
ambayo kujenga database mpya,

774
00:35:48,610 --> 00:35:51,980
kusema kwa ajili ya mradi wako mwenyewe wa mwisho kama wewe d
kama, na hatimaye kujenga

775
00:35:51,980 --> 00:35:55,900
nguvu tovuti kama Fedha CS50
kwamba kuruhusu swala data na

776
00:35:55,900 --> 00:35:58,140
update data dynamically.

777
00:35:58,140 --> 00:36:01,420
>> Wewe si kwenda na kutumia tu
rahisi Nakala faili au CSV.

778
00:36:01,420 --> 00:36:05,950
Unaweza kweli kutumia database smart
mpango ili uweze kutekeleza zaidi

779
00:36:05,950 --> 00:36:10,240
kisasa maswali kuliko kusoma tu
kwa kila kitu linearly.

780
00:36:10,240 --> 00:36:14,150
>> Hivyo kwa mfano, hii ni nini sisi kutoa
wewe nje ya sanduku kwa p-seti saba.

781
00:36:14,150 --> 00:36:18,280
Hii ni meza na inaonekana angalau
nguzo tatu, moja ambayo ni ya

782
00:36:18,280 --> 00:36:21,450
jina la mtumiaji, moja ambayo ni ya hash,
na mengine ambayo ni ya ID.

783
00:36:21,450 --> 00:36:26,200
>> Lakini jambo kuvutia, na tu
tease nje moja walidhani hapa, jina la mtumiaji

784
00:36:26,200 --> 00:36:29,270
labda ni tayari kipekee, haki?

785
00:36:29,270 --> 00:36:31,190
I mean, wengi tovuti yoyote, kama
una jina la mtumiaji, kuna

786
00:36:31,190 --> 00:36:32,370
haiwezi kuwa mbili Makaisari.

787
00:36:32,370 --> 00:36:33,440
Kuna hawezi kuwa mbili malans.

788
00:36:33,440 --> 00:36:34,950
Kuna hawezi kuwa mbili jharvards.

789
00:36:34,950 --> 00:36:35,600
Yake ya kipekee.

790
00:36:35,600 --> 00:36:38,610
Vinginevyo, hawajui ambayo
jharvard ni kweli ni.

791
00:36:38,610 --> 00:36:42,710
Basi nini ili kuwa motisha kwa ajili ya pia
baada ya safu ya tatu juu ya kushoto

792
00:36:42,710 --> 00:36:46,970
kuna kuitwa ID, ambayo inaonekana kama
idadi hiyo ni vile vile kipekee?

793
00:36:46,970 --> 00:36:51,300
Ni anahisi kutokuwa kidogo
kwangu katika mtazamo wa kwanza.

794
00:36:51,300 --> 00:36:54,910
Nini kinaweza kuwa na kulazimisha kuwa na
si pekee tu majina ya watumiaji,

795
00:36:54,910 --> 00:36:56,837
lakini pia kipekee idadi?

796
00:36:56,837 --> 00:36:59,460
>> Watazamaji: Wangeweza
nywila sawa.

797
00:36:59,460 --> 00:37:01,720
>> DAVID Malan: Watu wanaweza kuwa na
nywila sawa, uhakika.

798
00:37:01,720 --> 00:37:03,900
Ambayo inaweza kabisa kutokea.

799
00:37:03,900 --> 00:37:08,270
Lakini kama wana jina hili la mtumiaji kipekee, mimi
ingekuwa wanasema kwamba si kweli

800
00:37:08,270 --> 00:37:11,630
jambo, kwa sababu kama aina katika zao
jina la mtumiaji, mimi tu haja ya kuangalia yao

801
00:37:11,630 --> 00:37:15,060
password, wake zao hash.

802
00:37:15,060 --> 00:37:15,970
Kwa nini kingine?

803
00:37:15,970 --> 00:37:17,950
>> Watazamaji: Kasi kutafuta.

804
00:37:17,950 --> 00:37:18,680
>> DAVID Malan: Kasi kutafuta.

805
00:37:18,680 --> 00:37:19,548
Kwa nini?

806
00:37:19,548 --> 00:37:21,460
>> Watazamaji: ID ni moja tu.

807
00:37:21,460 --> 00:37:24,040
>> DAVID Malan: ID ni moja tu tabia,
au kuwa sahihi zaidi, ni ya simu,

808
00:37:24,040 --> 00:37:26,910
hivyo pengine 32 bits
au kitu kama hicho.

809
00:37:26,910 --> 00:37:30,270
Ambapo jina la mtumiaji, inaonekana Jason
Hirschhorn juu kuna ni aina ya

810
00:37:30,270 --> 00:37:33,900
ridiculously muda mrefu, na ni kwenda
kuchukua yangu mengi zaidi wakati kwa kamba

811
00:37:33,900 --> 00:37:40,910
kulinganisha H-I-R-S-C-H-H-O-R-N, na labda
0 / au kitu kama hicho, ili

812
00:37:40,910 --> 00:37:45,100
kuangalia juu Jason, kinyume na tu
akisema nipe mtumiaji namba mbili.

813
00:37:45,100 --> 00:37:46,510
Hiyo ni 32 bits.

814
00:37:46,510 --> 00:37:48,550
Ni INT moja ambayo
una kulinganisha.

815
00:37:48,550 --> 00:37:52,150
Na kwa kweli, kwamba ni kwa nini hasa database
huwa na hawawajui Vitambulisho vya kipekee kwa

816
00:37:52,150 --> 00:37:53,710
safu katika wao.

817
00:37:53,710 --> 00:37:56,280
>> Sasa nini wengine data aina kuna
badala ya INT na inaonekana

818
00:37:56,280 --> 00:37:57,160
masharti kama hii?

819
00:37:57,160 --> 00:37:59,700
Naam, kwa kuwa zaidi ya sahihi,
SQL database, kama

820
00:37:59,700 --> 00:38:02,060
MySQL, wana mashamba CHAR.

821
00:38:02,060 --> 00:38:05,320
Na Char kidogo kuwapotosha
si CHAR moja.

822
00:38:05,320 --> 00:38:10,290
Shamba CHAR katika orodha ya MySQL ni
herufi moja au zaidi, lakini ni

823
00:38:10,290 --> 00:38:11,780
idadi maalum ya wahusika.

824
00:38:11,780 --> 00:38:15,710
>> Hivyo kwa mfano, kama mimi kwenda juu na
phpMyAdmin kama unaweza kuwa tayari, au

825
00:38:15,710 --> 00:38:21,340
atakuja kuweka tatizo saba, na mimi kwenda
kwa database yangu, na kwa ajili ya kujifurahisha,

826
00:38:21,340 --> 00:38:25,700
hebu kuunda meza mpya iitwayo
mtihani na nguzo mbili tu.

827
00:38:25,700 --> 00:38:27,160
Mimi itabidi kisha bonyeza Go.

828
00:38:27,160 --> 00:38:30,070
Na hii itakuwa haki utambuzi,
hasa kama wewe Little

829
00:38:30,070 --> 00:38:31,130
karibu juu yako mwenyewe.

830
00:38:31,130 --> 00:38:34,140
Hapa nipate aina ID kujenga
meza mpya ya aina INT.

831
00:38:34,140 --> 00:38:37,770
Lakini hapa mimi ili aina jina la mtumiaji
recreate kwamba meza mapema.

832
00:38:37,770 --> 00:38:40,700
Na taarifa nina rundo zima
ya aina kuchagua.

833
00:38:40,700 --> 00:38:43,610
>> Na hii pia ni kwa nini phpMyAdmin
ni aina ya nice.

834
00:38:43,610 --> 00:38:46,770
Ni aina ya binafsi mafundisho kwa kuwa
unaweza tu aina ya uhakika, na bonyeza, na

835
00:38:46,770 --> 00:38:50,730
kuangalia dropdown menus, na kudai kutoka
kwamba kile nguvu SQL anakupa.

836
00:38:50,730 --> 00:38:54,090
>> Na kwa kweli, kama mimi kuchagua CHAR, mimi basi
na kutaja urefu, au jinsi

837
00:38:54,090 --> 00:38:55,940
maadili wengi, chars wangapi.

838
00:38:55,940 --> 00:39:00,090
Maadili jambo la kawaida sana ni mambo kama
255, lakini hiyo ni kidogo kwa muda mrefu.

839
00:39:00,090 --> 00:39:02,250
Kawaida ni nane kwa jina la mtumiaji.

840
00:39:02,250 --> 00:39:03,590
Lakini hiyo ni kidogo kidogo siku hizi.

841
00:39:03,590 --> 00:39:05,430
Hivyo hii ni uamuzi wa kubuni.

842
00:39:05,430 --> 00:39:08,630
Je, ni herufi 8 max,
32, 255, 1000?

843
00:39:08,630 --> 00:39:09,830
Ni kweli juu yako.

844
00:39:09,830 --> 00:39:12,350
Lakini shamba CHAR Idadi ya kudumu.

845
00:39:12,350 --> 00:39:16,420
Ili kuchagua chache pia na wewe ni aina ya
Star kama unataka jina la mtumiaji tena.

846
00:39:16,420 --> 00:39:19,132
Kuchagua wengi mno na nini
upande wa chini?

847
00:39:19,132 --> 00:39:20,820
>> Watazamaji: [inaudible].

848
00:39:20,820 --> 00:39:21,620
>> DAVID Malan: Ni fujo.

849
00:39:21,620 --> 00:39:24,835
Tu kama katika C, kama una kubwa
chunk ya kumbukumbu ya unahitaji, ni

850
00:39:24,835 --> 00:39:27,190
tu kupoteza muda na kupoteza nafasi.

851
00:39:27,190 --> 00:39:31,430
Hivyo kama njia mbadala, kuna
Varchar, ambayo kutatua tatizo hili kwa

852
00:39:31,430 --> 00:39:36,390
kutibu urefu si kama urefu fasta,
lakini kama urefu wa kiwango cha juu, na kutumia

853
00:39:36,390 --> 00:39:40,990
variable idadi ya chars, ambayo kisha
huelekea kutumia chars tu kama wengi kama wewe

854
00:39:40,990 --> 00:39:42,710
kweli wanahitaji.

855
00:39:42,710 --> 00:39:43,670
Inaonekana kuwa kamilifu.

856
00:39:43,670 --> 00:39:45,640
>> Mbona sisi kujikwamua
Data CHAR aina basi?

857
00:39:45,640 --> 00:39:48,500
Nini kinaweza kuwa upande wa chini ya
kutumia VARCHARs, ambayo sauti

858
00:39:48,500 --> 00:39:51,644
kama ni kushinda nzuri?

859
00:39:51,644 --> 00:39:52,596
Yeah?

860
00:39:52,596 --> 00:39:53,846
>> Watazamaji: [inaudible].

861
00:39:53,846 --> 00:39:57,360

862
00:39:57,360 --> 00:39:57,790
>> DAVID Malan: OK, nzuri.

863
00:39:57,790 --> 00:40:01,101
Hivyo kama wote wa data wako ni sawa
urefu, nini tatizo?

864
00:40:01,101 --> 00:40:05,250
>> Watazamaji: Kwa sababu wewe ni kupoteza
data kwa kuwaambia wote.

865
00:40:05,250 --> 00:40:09,060
>> DAVID Malan: Hivyo kama wote wa data yako ni
urefu huo huo, ingawa, napenda wanasema

866
00:40:09,060 --> 00:40:12,300
kwamba kubainisha urefu wa kiwango cha juu
juu ya varchar ni hakuna tofauti na

867
00:40:12,300 --> 00:40:16,070
kubainisha urefu fasta juu ya CHAR kama
unajua idadi hiyo mapema.

868
00:40:16,070 --> 00:40:19,500
Lakini kuna shaka, na mimi itabidi aina ya
dondoo kutoka jibu kwamba ukweli

869
00:40:19,500 --> 00:40:22,610
kwamba bado kuna max, ambayo inaweza
kuwa annoying, hasa kama wewe

870
00:40:22,610 --> 00:40:25,920
kukutana jina la mtu kwamba
isiyo ya kawaida kwa muda mrefu kwamba hakuwa

871
00:40:25,920 --> 00:40:26,860
wanatarajia.

872
00:40:26,860 --> 00:40:31,420
Na pia ni kidogo chini ya ufanisi
kwa kweli kutafuta kwenye VARCHARs kama

873
00:40:31,420 --> 00:40:35,620
kinyume na kutafuta chars, hasa
kwa ajili ya mbao kwa muda mrefu kwamba kuwa na kura na

874
00:40:35,620 --> 00:40:36,510
kura ya data.

875
00:40:36,510 --> 00:40:40,060
Hivyo hapa pia, mada ni tena
hakuna chaguo wazi.

876
00:40:40,060 --> 00:40:42,870
>> Hivyo tu kukupa hisia nyingine
data aina ambayo inaweza kuwa ya maslahi

877
00:40:42,870 --> 00:40:45,400
ama kwa ajili ya p-kuweka saba au katika
baadaye, kuna INT.

878
00:40:45,400 --> 00:40:47,270
Kuna BIGINT, ambayo
ni kama muda mrefu kwa muda mrefu.

879
00:40:47,270 --> 00:40:48,880
Inaelekea kuwa 64 bits.

880
00:40:48,880 --> 00:40:51,640
Kuna decimal, ambayo utaona katika
kuweka tatizo, ambayo ni kiasi

881
00:40:51,640 --> 00:40:55,300
jibu safi na matatizo sisi
yaliyojitokeza na kuelea na yaliyo

882
00:40:55,300 --> 00:40:55,980
uhakika kutokuwa sahihi.

883
00:40:55,980 --> 00:40:57,390
Na kisha kuna DATETIME.

884
00:40:57,390 --> 00:41:01,530
Kuna literally aina data ambayo ina
kuangalia kama mwaka, mwezi, siku,

885
00:41:01,530 --> 00:41:03,730
na saa, dakika, na ya pili.

886
00:41:03,730 --> 00:41:07,470
>> Lakini database SQL pia na
mambo Tutamwita bahati.

887
00:41:07,470 --> 00:41:11,630
Na index ni kitu ambacho
bayana wakati kujenga meza kwa

888
00:41:11,630 --> 00:41:15,720
kufanya upekuzi na shughuli nyingine
ufanisi zaidi.

889
00:41:15,720 --> 00:41:18,550
Hasa, kuna kitu kinachoitwa
PRIMARY index kwamba unaweza

890
00:41:18,550 --> 00:41:19,440
kutangaza kama ifuatavyo.

891
00:41:19,440 --> 00:41:22,330
>> Sisi alifanya hivyo kwa ajili yenu na
watumiaji meza sisi kukupa.

892
00:41:22,330 --> 00:41:26,160
Lakini taarifa kama ningekuwa manually recreating
watumiaji meza hapa kutoa

893
00:41:26,160 --> 00:41:27,110
ni jina la watumiaji.

894
00:41:27,110 --> 00:41:28,125
Mimi tayari fulani ID.

895
00:41:28,125 --> 00:41:29,330
Mimi fulani INT.

896
00:41:29,330 --> 00:41:32,000
Mimi fulani jina la mtumiaji na
kiwango cha juu 32 wahusika.

897
00:41:32,000 --> 00:41:36,140
Lakini kama sisi kuendelea scrolling katika huu haki
dirisha pana, taarifa kuna

898
00:41:36,140 --> 00:41:38,260
kundi la mambo mengine siwezi bayana.

899
00:41:38,260 --> 00:41:40,950
>> Moja, siwezi kutaja sifa
kama, unajua nini, hii

900
00:41:40,950 --> 00:41:42,190
INT lazima Unsigned.

901
00:41:42,190 --> 00:41:45,510
Sitaki idadi hasi,
hivyo hebu kufanya hivyo Unsigned.

902
00:41:45,510 --> 00:41:48,660
Batili si muhimu hapa kwa sababu
Mimi nataka kila mtumiaji

903
00:41:48,660 --> 00:41:49,640
kuwa na idadi ya kipekee.

904
00:41:49,640 --> 00:41:50,830
Sitaki kuwa ni null.

905
00:41:50,830 --> 00:41:52,330
>> Lakini hii ni ya kuvutia.

906
00:41:52,330 --> 00:41:57,780
Naweza bayana kwamba ID ni ama
msingi muhimu ya orodha hii, au ni

907
00:41:57,780 --> 00:42:00,620
kipekee, au ni indexed, au Nakala full.

908
00:42:00,620 --> 00:42:05,630
Hivyo kwa ajili ya leo, kwa muda mrefu hadithi
short, PRIMARY ina maana kwamba hii atakuwa

909
00:42:05,630 --> 00:42:10,570
kuwa wote conceptually na utaalamu
shamba kwamba sisi kutumia kipekee

910
00:42:10,570 --> 00:42:12,140
kutambua watumiaji.

911
00:42:12,140 --> 00:42:16,140
>> Hivyo wakati sisi kuangalia juu watumiaji, hii ni aina
ahadi kwa kuangalia yao juu zaidi na

912
00:42:16,140 --> 00:42:17,370
kwamba kitambulisho kipekee.

913
00:42:17,370 --> 00:42:21,930
Na database itahakikisha kwamba kama wewe
kuwa na idadi user 3, huwezi

914
00:42:21,930 --> 00:42:25,400
kimwili kuingiza mtumiaji mwingine
na kwamba idadi sawa 3.

915
00:42:25,400 --> 00:42:28,380
database tu kukataa
kuhifadhi mabadiliko yako.

916
00:42:28,380 --> 00:42:32,310
Ambayo ni jambo jema, kwa sababu unaweza
kujikinga na wewe mwenyewe. binafsi

917
00:42:32,310 --> 00:42:34,270
>> Vinginevyo, kwa jina la mtumiaji.

918
00:42:34,270 --> 00:42:37,670
Hivyo safu ya pili, kukumbuka,
ni shamba la mtumiaji.

919
00:42:37,670 --> 00:42:41,860
Hivyo safu ya pili hapa ni jina la mtumiaji,
kama tulivyofanya juu ya mbali kushoto hapo.

920
00:42:41,860 --> 00:42:43,940
>> Hivyo kile kingine ili nataka kutaja?

921
00:42:43,940 --> 00:42:47,840
Mimi si kuruhusiwa, kwa mujibu wa SQL,
kutaja funguo mbili za msingi.

922
00:42:47,840 --> 00:42:50,750
unaweza bayana muhimu pamoja ambapo
kuangalia mashamba yote mawili, lakini hawawezi

923
00:42:50,750 --> 00:42:52,260
mmoja mmoja kuwa funguo za msingi.

924
00:42:52,260 --> 00:42:54,750
Hivyo kwamba ni nje ya swali.

925
00:42:54,750 --> 00:42:56,040
Hivyo ambayo inaweza nataka kuchagua?

926
00:42:56,040 --> 00:42:59,710
>> Naam, UNIQUE ni sawa katika roho
muhimu msingi ambapo wewe taja hii

927
00:42:59,710 --> 00:43:03,570
shamba hilo kuwa ya kipekee, lakini ni
si kwenda kuwa moja

928
00:43:03,570 --> 00:43:04,410
Mimi kutumia muda wote.

929
00:43:04,410 --> 00:43:08,450
Na sisi siyo kwenda kwa kutumia hii moja wote
wakati kwa sababu gani tena?

930
00:43:08,450 --> 00:43:10,490
Ni polepole uwezekano wa ikiwa
ni jina la mtumiaji kwa muda mrefu.

931
00:43:10,490 --> 00:43:11,740
Ni tu kupoteza muda.

932
00:43:11,740 --> 00:43:16,140
>> INDEX, wakati huo huo, anaelezea bayana kwamba ni
si kwenda kuwa ya kipekee, lakini Ningependa

933
00:43:16,140 --> 00:43:19,470
wewe kazi uchawi wako chini ya
Hood kufanya hivyo kwa kasi kwa ajili yangu na

934
00:43:19,470 --> 00:43:21,420
kutafuta kwenye uwanja huu.

935
00:43:21,420 --> 00:43:23,320
Basi pengine hii si sahihi hapa.

936
00:43:23,320 --> 00:43:26,500
Kwa jina la mtumiaji, Ningependa kusema kwamba
UNIQUE ni jibu nzuri.

937
00:43:26,500 --> 00:43:31,200
Lakini tuseme kwamba sisi alifanya zaidi ya watumiaji
kuvutia zaidi kuliko majina ya watumiaji tu,

938
00:43:31,200 --> 00:43:32,430
hashes, na ID idadi.

939
00:43:32,430 --> 00:43:33,860
Nini kama sisi aliwapa watu majina kamili?

940
00:43:33,860 --> 00:43:37,700
Nini kama sisi akawapa anwani
na data nyingine juu yao?

941
00:43:37,700 --> 00:43:43,360
>> Naam, kama wewe bayana kwamba safu katika
Mbegu ni indexed, hiyo ina maana kwamba

942
00:43:43,360 --> 00:43:47,730
MySQL, au Oracle, au chochote database
unatumia, wanapaswa kufanya kazi yake ya uchawi

943
00:43:47,730 --> 00:43:51,300
na kutumia aina fulani ya data dhana
muundo kama mti, au trie, au a

944
00:43:51,300 --> 00:43:55,940
hash meza, au kitu kuhakikisha
kwamba wakati wewe kutafuta data kwa kutumia

945
00:43:55,940 --> 00:43:58,150
kuchagua kwenye uwanja fulani -

946
00:43:58,150 --> 00:44:01,310
kama kuonyesha yangu kwamba kila mtu
maisha ya Oxford Street.

947
00:44:01,310 --> 00:44:02,540
swala kama hiyo.

948
00:44:02,540 --> 00:44:06,250
Kama una maalum katika mapema kwamba
unataka index juu ya shamba hilo,

949
00:44:06,250 --> 00:44:09,050
utafutaji itakuwa, kwa kasi zaidi.

950
00:44:09,050 --> 00:44:12,090
>> Kama huna bayana index, bora
unaweza kufanya ni kutafuta linear kama

951
00:44:12,090 --> 00:44:13,030
siyo vyema.

952
00:44:13,030 --> 00:44:16,220
Lakini kama wewe taja INDEX, smart
watu ambao alifanya database -

953
00:44:16,220 --> 00:44:19,340
kwa watu kama wewe ambao sasa kujua miti
na inajaribu na meza hash -

954
00:44:19,340 --> 00:44:23,220
moja kwa moja kujenga data kama
muundo katika RAM kuhakikisha kwamba

955
00:44:23,220 --> 00:44:26,050
utafutaji wale ni kwa kasi zaidi.

956
00:44:26,050 --> 00:44:29,660
>> Fulltext wakati huo huo ni sawa katika roho,
lakini inaruhusu kufanya wildcard

957
00:44:29,660 --> 00:44:35,480
utafutaji, kama kuonyesha yangu kwamba kila mtu
anaishi katika mitaa yanayoanza kwa

958
00:44:35,480 --> 00:44:36,960
barua O kwa sababu yoyote.

959
00:44:36,960 --> 00:44:38,850
Unaweza kufanya upekuzi wildcard
kama hiyo.

960
00:44:38,850 --> 00:44:45,880
Au, mambo zaidi ya kulazimisha kama show
mimi kila mtu ambaye ana neno -

961
00:44:45,880 --> 00:44:49,400
kuonyesha yangu kila ambaye jina lake kuanza
pamoja na barua fulani.

962
00:44:49,400 --> 00:44:51,880
Unaweza kutafuta maneno
kwa njia hii.

963
00:44:51,880 --> 00:44:52,630
Sawa.

964
00:44:52,630 --> 00:44:55,760
>> Hivyo, nafasi kubuni
huko uwezekano.

965
00:44:55,760 --> 00:44:57,740
Kuna wengine kuwa mimi itabidi
wimbi mikono yangu.

966
00:44:57,740 --> 00:45:00,530
Ni zinageuka kuwa unaweza kuwa na
kuhifadhi injini mbalimbali.

967
00:45:00,530 --> 00:45:04,390
Na hii ni arcane zaidi tunahitaji
hakika kwa kuweka tatizo saba.

968
00:45:04,390 --> 00:45:06,920
By default, you guys ni kutumia
kitu kinachoitwa InnoDB.

969
00:45:06,920 --> 00:45:10,910
Utaona kutaja mahali fulani katika
interface phpMyAdmin ya uwezekano zaidi.

970
00:45:10,910 --> 00:45:14,130
Lakini kujua kwamba kuna mpango mwingine
maamuzi ambayo ni ya uwezo

971
00:45:14,130 --> 00:45:18,030
maslahi ya kuja miradi mwisho kama
kufanya kitu mtandao msingi.

972
00:45:18,030 --> 00:45:19,330
>> Lakini hebu kufanya hivyo.

973
00:45:19,330 --> 00:45:23,130
Hebu kwenda mbele na kuweka hii juu ya
screen kama teaser kwa hadithi

974
00:45:23,130 --> 00:45:26,330
kuwashirikisha wewe, roommate,
na glasi ya maziwa.

975
00:45:26,330 --> 00:45:28,240
Hebu dakika mbili
au hivyo kuvunja hapa.

976
00:45:28,240 --> 00:45:31,060
Na kama unaweza fimbo karibu, hebu kuja
tena, kuangalia kidogo zaidi katika SQL, na

977
00:45:31,060 --> 00:45:35,160
kisha kidogo ya JavaScript na
p-kuweka nane katika akili.

978
00:45:35,160 --> 00:45:36,120
>> Sawa.

979
00:45:36,120 --> 00:45:40,420
Hivyo, hebu kupata wewe kufikiria juu ya
kona kesi ambayo inaweza kwa urahisi sana kutokea

980
00:45:40,420 --> 00:45:44,240
katika mazingira ya kutumia database, au
kusema ukweli, hata kwa kutumia mambo halisi ya dunia

981
00:45:44,240 --> 00:45:46,280
kama ATM kupata fedha.

982
00:45:46,280 --> 00:45:47,640
Hivyo hapa ni jokofu.

983
00:45:47,640 --> 00:45:50,040
Tuseme nimepata moja pia katika
Dorm yako au nyumba yako.

984
00:45:50,040 --> 00:45:54,990
Na nimepata roommate moja, na wote
kweli kama maziwa kwa mfano.

985
00:45:54,990 --> 00:45:57,210
>> Hivyo wewe kuja nyumbani kutoka darasa siku moja.

986
00:45:57,210 --> 00:45:58,490
Yeye au yeye ni bado nyuma.

987
00:45:58,490 --> 00:45:59,180
Unaweza kufungua friji.

988
00:45:59,180 --> 00:46:00,870
Kweli unataka kioo kubwa ya maziwa.

989
00:46:00,870 --> 00:46:01,820
Hakuna maziwa.

990
00:46:01,820 --> 00:46:02,920
Basi je, wewe nini?

991
00:46:02,920 --> 00:46:03,840
Wewe karibu fridge.

992
00:46:03,840 --> 00:46:04,670
Kunyakua funguo yako.

993
00:46:04,670 --> 00:46:05,930
Kwenda nje ya mraba.

994
00:46:05,930 --> 00:46:09,240
Na kupata katika mstari katika CVS kwa wale
binafsi Checkout mambo, ambayo daima

995
00:46:09,240 --> 00:46:11,180
kuchukua muda mrefu zaidi kwa kweli
kuwa mtunza fedha.

996
00:46:11,180 --> 00:46:11,820
Hata hivyo.

997
00:46:11,820 --> 00:46:15,490
>> Hivyo basi, wakati huo huo, dot dot dot, yako
roommate huja nyumbani na yeye

998
00:46:15,490 --> 00:46:17,440
vile vile ina hankering
kwa baadhi ya maziwa.

999
00:46:17,440 --> 00:46:20,380
Hivyo yeye au yeye kufungua fridge,
inaonekana ndani, na oh, damn.

1000
00:46:20,380 --> 00:46:21,160
No maziwa.

1001
00:46:21,160 --> 00:46:24,750
Hivyo yeye anaongoza nje, hutokea kwenda
kwa CVS nyingine, ambayo ilikuwa tu

1002
00:46:24,750 --> 00:46:27,900
kuzuia mbali kwa sababu fulani, na yeye au
yeye anapata katika line kununua baadhi ya maziwa.

1003
00:46:27,900 --> 00:46:30,480
>> Wakati huo huo, wewe kuja nyumbani, yeye au
anarejea nyumbani, na nini

1004
00:46:30,480 --> 00:46:31,980
hatimaye na?

1005
00:46:31,980 --> 00:46:33,080
Maziwa mara mbili zaidi.

1006
00:46:33,080 --> 00:46:34,620
Lakini si kweli kama
maziwa kiasi hicho.

1007
00:46:34,620 --> 00:46:37,300
Hivyo sasa una maziwa kiasi kwamba sasa
mmoja wao ni kwenda tu chacha

1008
00:46:37,300 --> 00:46:37,820
hatimaye.

1009
00:46:37,820 --> 00:46:39,370
Hivyo hili ni tatizo mbaya kweli kweli.

1010
00:46:39,370 --> 00:46:39,900
Haki?

1011
00:46:39,900 --> 00:46:41,990
>> Basi nini kimetokea?

1012
00:46:41,990 --> 00:46:44,810
Hivyo kimsingi, hii ni aina
mfano ujinga.

1013
00:46:44,810 --> 00:46:48,580
Lakini chini ya Hood, nini tulikuwa na
kutokea hapa ni ya wote wewe checked

1014
00:46:48,580 --> 00:46:52,390
hali ya baadhi ya kipande cha
kumbukumbu, jokofu.

1015
00:46:52,390 --> 00:46:54,420
Wote wa checked hali
baadhi ya kutofautiana.

1016
00:46:54,420 --> 00:46:57,360
Ninyi wawili wakakata kauli
kwamba basi alitenda juu.

1017
00:46:57,360 --> 00:47:01,420
Lakini kwa bahati mbaya, wakati roommate yako
mara katika kuhifadhi, hali ya kuwa

1018
00:47:01,420 --> 00:47:05,670
variable iliyopita, yeye au yeye akarudi
na sasa anataka kubadili serikali, lakini

1019
00:47:05,670 --> 00:47:07,480
ni tayari iliyopita
juu yake au kwake.

1020
00:47:07,480 --> 00:47:11,120
Na bila shaka, yeye au yeye bila kuwa na
wamekwenda kuhifadhi kama walijua

1021
00:47:11,120 --> 00:47:13,010
kwamba walikuwa tayari njiani.

1022
00:47:13,010 --> 00:47:16,430
>> Hivyo katika ulimwengu wa kweli, jinsi gani unaweza
kuepuka tatizo hili, kuchukua una

1023
00:47:16,430 --> 00:47:18,940
fridge, una roommate,
na kweli kama maziwa?

1024
00:47:18,940 --> 00:47:19,760
>> Watazamaji: Kuwasiliana.

1025
00:47:19,760 --> 00:47:20,580
>> DAVID Malan: Kuwasiliana.

1026
00:47:20,580 --> 00:47:21,160
OK.

1027
00:47:21,160 --> 00:47:22,500
Lakini jinsi gani unaweza kuwasiliana?

1028
00:47:22,500 --> 00:47:23,990
>> Watazamaji: Tuache kumbuka.

1029
00:47:23,990 --> 00:47:25,480
>> DAVID Malan: Tuache kumbuka, haki?

1030
00:47:25,480 --> 00:47:28,025
Daima kuondoka kumbuka, kwa
mashabiki wa show.

1031
00:47:28,025 --> 00:47:31,580
Haki ya wote, hivyo daima kuondoka kumbuka, au
kuweka kweli kama kufuli au kitu

1032
00:47:31,580 --> 00:47:35,440
kwenye friji kwamba anaendelea yako
roommate kutoka ukaguzi wa hali ya

1033
00:47:35,440 --> 00:47:36,540
kwamba kutofautiana.

1034
00:47:36,540 --> 00:47:40,800
>> Sasa, kwa nini huenda hii kuwa germane na
tatizo kuweka saba, au kwa ATM.

1035
00:47:40,800 --> 00:47:46,780
Naam, kufikiria dunia katika ATM ambapo
unaweza kuwa na uwezo wa kwenda juu kwa ATM

1036
00:47:46,780 --> 00:47:48,920
mashine hapa, na mwingine ATM hapa.

1037
00:47:48,920 --> 00:47:50,680
Na hii hufanyika mara nyingi kabisa.

1038
00:47:50,680 --> 00:47:54,150
Na tuseme wewe alikuwa na kadi za ATM mbili,
ambayo inawezekana kupata.

1039
00:47:54,150 --> 00:47:57,420
Na kuingia katika mashine zote mbili
ufanisi wakati huo huo, hopefully

1040
00:47:57,420 --> 00:47:58,660
wakati hakuna mtu wa kuangalia.

1041
00:47:58,660 --> 00:48:01,260
Na kisha wewe aina katika PIN yako
takribani wakati huo huo.

1042
00:48:01,260 --> 00:48:06,280
Na kisha kufanya swala usawa
kuona jinsi gani fedha una.

1043
00:48:06,280 --> 00:48:08,920
Na hebu sema una $ 100
kushoto katika akaunti yako.

1044
00:48:08,920 --> 00:48:13,310
Hivyo kimsingi wakati huo huo, wewe
kusema moja, sifuri, sifuri, kuingia.

1045
00:48:13,310 --> 00:48:16,000
Na wewe hopefully kupata nyuma baadhi ya fedha.

1046
00:48:16,000 --> 00:48:18,440
>> Lakini kiasi gani cha fedha ili kupata nyuma?

1047
00:48:18,440 --> 00:48:21,710
Sasa kompyuta katika mwisho wa siku,
hasa kama ni kuzungumza na

1048
00:48:21,710 --> 00:48:27,360
watumishi, si lazima kufanya mambo
ili ambayo inatarajiwa.

1049
00:48:27,360 --> 00:48:30,860
>> Hivyo tuseme nini kinatokea, kwa sababu ya
chochote kasi ya mtandao kuna masuala ya

1050
00:48:30,860 --> 00:48:34,530
ni, au CPU masuala kuna, au
kitu kama hicho, tuseme kwamba

1051
00:48:34,530 --> 00:48:38,530
ATM kwanza hundi mizani yako na
anaona, oh, mtu huyu ana $ 100.

1052
00:48:38,530 --> 00:48:41,840
Lakini basi anapata aliwasihi kwa sababu labda
Backup kinatokea na hivyo ni

1053
00:48:41,840 --> 00:48:42,500
kupunguza chini.

1054
00:48:42,500 --> 00:48:45,080
Au labda wakati kuangalia, mtandao
uhusiano got kidogo polepole kwa sababu

1055
00:48:45,080 --> 00:48:45,910
hii hutokea tu.

1056
00:48:45,910 --> 00:48:47,100
Wao uko kimwili vifaa.

1057
00:48:47,100 --> 00:48:49,330
Hivyo wakati huo huo, ATM ya pili ni
kuuliza swali moja.

1058
00:48:49,330 --> 00:48:53,030
Kiasi gani cha fedha haina Daudi na?
$ 100 ni jibu.

1059
00:48:53,030 --> 00:48:58,930
Lakini kwa sababu ya ATM ya kwanza bado
alimtuma ujumbe Ondoa $ 100, wote wawili

1060
00:48:58,930 --> 00:49:03,000
ATM kuwa kukaguliwa kuba benki hiyo,
kwani ni $ 100 kuna, na sasa

1061
00:49:03,000 --> 00:49:07,160
wote wawili mashine uwezekano ni
kwenda mate nje jibu.

1062
00:49:07,160 --> 00:49:12,240
>> Sasa, hii ni kubwa kwa wewe katika baadhi ya hisia
kama kile benki gani hatimaye

1063
00:49:12,240 --> 00:49:17,200
ni mabadiliko ya kiasi kwa minus 100 na
kuweka kutofautiana sawa na yako

1064
00:49:17,200 --> 00:49:21,570
akaunti ya benki sawa na 0, kinyume
kwa kufanya bala 100.

1065
00:49:21,570 --> 00:49:24,410
Sasa katika hali mbaya zaidi kwa ajili ya benki -

1066
00:49:24,410 --> 00:49:27,470
au katika bora kwa ajili ya benki, wakati huo huo,
wao kukupa $ 200, na

1067
00:49:27,470 --> 00:49:31,690
akaunti ya benki yako sasa inaonyesha hasi
$ 100, ambayo kwa kweli haina

1068
00:49:31,690 --> 00:49:32,950
kufaidika wewe wakati wote.

1069
00:49:32,950 --> 00:49:36,500
Lakini uhakika ni kwamba hii mbio
sharti mbili roommates kupata

1070
00:49:36,500 --> 00:49:40,660
maziwa, au kwa ajili ya mbili ATM kujaribu kupata fedha
na mabadiliko ya hali ya kuba

1071
00:49:40,660 --> 00:49:44,510
wakati huo huo ipo yoyote
wakati una database.

1072
00:49:44,510 --> 00:49:48,290
>> Sasa katika tatizo kuweka saba, suala hili
lililojitokeza kwa maana kwamba kama kununua

1073
00:49:48,290 --> 00:49:52,110
sehemu ya hisa Facebook, na kisha kwa ajili ya
mfano kununua sehemu ya pili ya

1074
00:49:52,110 --> 00:49:55,160
Picha za hisa, unahitaji kufanya
uamuzi kama programu.

1075
00:49:55,160 --> 00:49:58,710
Ili kuamua jinsi ya update
database, tabia mbaya ni wewe kwenda

1076
00:49:58,710 --> 00:50:02,250
kuwa na mstari mmoja kwa hisa kwamba, na hii
ni njia mojawapo ya kutekeleza.

1077
00:50:02,250 --> 00:50:06,640
Na wewe ni kwenda na moja ya sehemu ya
FB, ambayo ni ya hisa zao alama Ticker

1078
00:50:06,640 --> 00:50:10,120
kwa jina hili la mtumiaji, au hii mtumiaji
ID, kitambulisho kipekee.

1079
00:50:10,120 --> 00:50:12,340
>> Lakini hadithi hiyo inaweza kutokea hapa.

1080
00:50:12,340 --> 00:50:15,800
Kama huna CHAGUA katika SQL, kama utaona
katika tatizo kuweka saba wakati unaweza kuona,

1081
00:50:15,800 --> 00:50:18,460
oh, Daudi ana sehemu moja
ya hisa ya kuungana.

1082
00:50:18,460 --> 00:50:23,240
Basi mimi sasa kubadili hili kuwa mbili hisa,
kwa sababu yeye anataka kununua

1083
00:50:23,240 --> 00:50:24,120
pili kushiriki.

1084
00:50:24,120 --> 00:50:27,860
Lakini tuseme Daudi kweli alikuwa na mbili
browser madirisha wazi, au tuseme kwamba

1085
00:50:27,860 --> 00:50:32,150
ni akaunti ya pamoja na wanandoa wawili,
na wote wawili ni kujaribu kufanya

1086
00:50:32,150 --> 00:50:36,770
operesheni hiyo, kuna, pia,
uwezo lipo kwa ajili ya uamuzi wa kuwa na

1087
00:50:36,770 --> 00:50:39,670
alifanya msingi uliopita
hali ya dunia -

1088
00:50:39,670 --> 00:50:41,290
akaunti ina sehemu moja -

1089
00:50:41,290 --> 00:50:45,630
na wote watu, au seva zote mbili, sasa
kujaribu kusema increment kwa hisa mbili.

1090
00:50:45,630 --> 00:50:49,020
Lakini katika kesi hii, unaweza kuwa na kushtakiwa
yangu ya fedha kwa ajili ya hisa zote mbili, lakini

1091
00:50:49,020 --> 00:50:50,830
incremented tu kwamba moja wakati.

1092
00:50:50,830 --> 00:50:54,730
>> Hivyo katika muda mfupi, tatizo la msingi
hapa, kama na utani kuhusu kuondoka

1093
00:50:54,730 --> 00:50:58,750
kumbuka, au kuweka kufuli juu yake, ni
kama watu wawili, au nyuzi mbili -

1094
00:50:58,750 --> 00:50:59,930
kufikiri nyuma scratch -

1095
00:50:59,930 --> 00:51:03,220
wanaweza kukagua hali ya baadhi ya kutofautiana
na kisha kujaribu kubadili kwamba kutofautiana,

1096
00:51:03,220 --> 00:51:07,950
lakini mambo hayo mawili si kutokea katika
Wakati huo huo lakini wanaweza kupata kuingiliwa

1097
00:51:07,950 --> 00:51:11,500
na mambo mengine yanayotokea, data unaweza
kupata katika hali weird sana.

1098
00:51:11,500 --> 00:51:15,450
Na unaweza kufaidika au unaweza kuteseka
kwa maana ya mfano fedha.

1099
00:51:15,450 --> 00:51:18,110
>> Hivyo katika tatizo kuweka saba, sisi kukupa
hii line moja ya kanuni, ambayo kwa muda mrefu

1100
00:51:18,110 --> 00:51:21,000
hadithi fupi, kutatua hii
tatizo katika MySQL.

1101
00:51:21,000 --> 00:51:24,950
Maelekezo haya kwa muda mrefu sana kwamba haina
hata fit kwenye line moja juu ya

1102
00:51:24,950 --> 00:51:30,370
screen hapa kuhakikisha kwamba operesheni yako
ni nini wito atomic.

1103
00:51:30,370 --> 00:51:33,720
Ni yote hufanyika mara moja, au
haina kutokea wakati wote.

1104
00:51:33,720 --> 00:51:37,530
Hii maneno ya muda mrefu sana hawawezi
kupata kuingiliwa sehemu.

1105
00:51:37,530 --> 00:51:39,840
>> Na kile yake ni halisi
nini anasema.

1106
00:51:39,840 --> 00:51:44,200
Kuingiza katika meza baadhi zifuatazo
nyanja tatu wale maadili maalum,

1107
00:51:44,200 --> 00:51:47,280
lakini juu ya muhimu duplicate,
si kufanya Insert.

1108
00:51:47,280 --> 00:51:48,280
Kufanya update.

1109
00:51:48,280 --> 00:51:52,450
Hivyo hii ni kama kufanya SELECT na
Kuingiza ili kuzungumza kwa wakati mmoja.

1110
00:51:52,450 --> 00:51:55,150
Na ni nini muhimu kwamba pengine
kuwa inajulikana hapa?

1111
00:51:55,150 --> 00:51:58,300

1112
00:51:58,300 --> 00:52:01,380
>> Ni zamu nje, na utaona hii katika
kuweka tatizo spec saba, kwa sababu

1113
00:52:01,380 --> 00:52:06,040
tumekuwa alitangaza kuwa kuna muhimu kipekee
juu ya meza hii hasa kama kwamba

1114
00:52:06,040 --> 00:52:08,480
huwezi kuwa na safu mbalimbali
kwa mtumiaji sawa na

1115
00:52:08,480 --> 00:52:10,150
sawa hisa senti alama -

1116
00:52:10,150 --> 00:52:13,780
katika mfano huu hapa, DVN.V ni
silly hisa senti kwamba sisi

1117
00:52:13,780 --> 00:52:14,980
rejea katika spec.

1118
00:52:14,980 --> 00:52:17,860
Kwa sababu tumekuwa alitangaza kuwa ya kipekee,
nini maana ya hii ni kwamba kama wewe

1119
00:52:17,860 --> 00:52:23,580
kujaribu kuingiza mstari duplicate, wewe ni
badala ya kwenda update bila

1120
00:52:23,580 --> 00:52:27,020
mtu mwingine kuwa na nafasi ya kubadilika
hali ya dunia aidha.

1121
00:52:27,020 --> 00:52:29,400
Hivyo katika muda mfupi, hii kuhakikisha
mambo ni atomic.

1122
00:52:29,400 --> 00:52:32,530
>> Zaidi kwa ujumla ingawa, database
kama MySQL -

1123
00:52:32,530 --> 00:52:35,460
na huna haja ya kipengele hiki kwa
p-kuweka saba lakini kuitunza katika akili kwa

1124
00:52:35,460 --> 00:52:36,200
baadaye -

1125
00:52:36,200 --> 00:52:38,870
kusaidia kile kinachojulikana shughuli,
ambapo unaweza kusema

1126
00:52:38,870 --> 00:52:40,990
Kuanza manunuzi literally.

1127
00:52:40,990 --> 00:52:43,270
Unaweza kisha kutekeleza
mbili SQL taarifa.

1128
00:52:43,270 --> 00:52:45,710
Na SQL taarifa, kama utaona
katika p-kuweka saba, inaonekana kidogo

1129
00:52:45,710 --> 00:52:46,750
kitu kama hiki.

1130
00:52:46,750 --> 00:52:48,820
Mwisho meza aitwaye akaunti.

1131
00:52:48,820 --> 00:52:52,550
Kuweka uwiano safu sawa kwa kila
usawa safu sasa

1132
00:52:52,550 --> 00:52:57,280
ni minus 1000 ambapo idadi,
akaunti namba, kama user ID,

1133
00:52:57,280 --> 00:53:00,830
sawa na 2, na kisha update
akaunti dot dot dot.

1134
00:53:00,830 --> 00:53:04,350
>> Hivyo katika suala layman, je, hizi mbili
maswali wanaonekana kufanya katika

1135
00:53:04,350 --> 00:53:05,840
ulimwengu halisi kwa maana ya benki?

1136
00:53:05,840 --> 00:53:07,440
>> Watazamaji: Kuhamisha kwa akiba.

1137
00:53:07,440 --> 00:53:08,020
>> DAVID Malan: Hasa.

1138
00:53:08,020 --> 00:53:10,470
Kuhamisha fedha kutoka moja
akaunti ya nyingine.

1139
00:53:10,470 --> 00:53:14,400
Na hii ni mfano mwingine ambapo
kweli wanataka mambo haya mawili kutokea

1140
00:53:14,400 --> 00:53:15,570
au si kutokea.

1141
00:53:15,570 --> 00:53:18,880
Hawataki kitu kupata katika
katikati yao na uwezekano wa kuharibu

1142
00:53:18,880 --> 00:53:22,220
math, au kuharibu kiasi gani
fedha una, au kiasi gani

1143
00:53:22,220 --> 00:53:23,170
fedha benki ina.

1144
00:53:23,170 --> 00:53:26,890
Basi nini kweli ni nzuri juu ya shughuli za
katika MySQL ni kwamba, na

1145
00:53:26,890 --> 00:53:30,160
database zaidi kwa ujumla, ni kwamba wao
na watu smart ambao wameweza kutekelezwa

1146
00:53:30,160 --> 00:53:33,670
makala haya kufikiri jinsi ya kufanya
uhakika kwamba wote wa mambo hayo kutokea

1147
00:53:33,670 --> 00:53:35,120
au si wakati wote.

1148
00:53:35,120 --> 00:53:38,580
>> Na kama wewe ni kweli anayetaka kufanya
tovuti hiyo kutumiwa na watu juu ya

1149
00:53:38,580 --> 00:53:41,490
chuo hicho, watu katika ulimwengu halisi, kufanya
kitu kwa maana startup,

1150
00:53:41,490 --> 00:53:43,300
hizi ni aina ya
maamuzi kubuni kwamba

1151
00:53:43,300 --> 00:53:45,020
kuwa milele muhimu sana.

1152
00:53:45,020 --> 00:53:48,240
Vinginevyo, kuanza kupoteza data, kupoteza
watumiaji, au katika hali mbaya zaidi kama

1153
00:53:48,240 --> 00:53:51,800
tumeona hapa, uwezekano wa
kupoteza fedha.

1154
00:53:51,800 --> 00:53:56,180
Hivyo tena, zaidi juu ya kwamba katika kuweka tatizo
saba, kama vile labda kwa baadhi ya

1155
00:53:56,180 --> 00:53:57,530
katika miradi ya mwisho.

1156
00:53:57,530 --> 00:54:01,870
>> Basi hebu mabadiliko hayo picha tulikuwa
wakati uliopita tu kwa njia moja zaidi.

1157
00:54:01,870 --> 00:54:04,070
Hivyo basi mimi kwa kweli kuona kama naweza -

1158
00:54:04,070 --> 00:54:06,030
nope, kwamba gone.

1159
00:54:06,030 --> 00:54:06,690
Kuna ni.

1160
00:54:06,690 --> 00:54:09,020
>> Hivyo hii ni ambapo sisi kushoto wakati wa mwisho.

1161
00:54:09,020 --> 00:54:12,390
Na zinageuka tunakwenda toss
jambo moja zaidi katika mchanganyiko hapa -

1162
00:54:12,390 --> 00:54:14,510
lugha inayoitwa JavaScript.

1163
00:54:14,510 --> 00:54:18,060
Hivyo JavaScript kweli inafaa
ndani ya kipande hii -

1164
00:54:18,060 --> 00:54:22,086
na mimi si kabisa kuacha nafasi ya kutosha,
hivyo hii si sasa kwa wadogo.

1165
00:54:22,086 --> 00:54:23,900
OK, hii ni kweli pathetic.

1166
00:54:23,900 --> 00:54:27,075
OK, hivyo kwamba ni JavaScript.

1167
00:54:27,075 --> 00:54:27,340
Sawa.

1168
00:54:27,340 --> 00:54:28,760
Mimi kwa kweli kufanya hivyo disservice.

1169
00:54:28,760 --> 00:54:29,390
Sawa.

1170
00:54:29,390 --> 00:54:34,790
>> Hivyo JavaScript ni programu nyingine
lugha, na mwisho wetu, Kama ambayo husaidia

1171
00:54:34,790 --> 00:54:37,770
kuwahakikishia kwamba kuna si mengi zaidi
ya hydrants moto hapa.

1172
00:54:37,770 --> 00:54:41,100
Hivyo JavaScript ni pia kutafsiriwa
lugha, ambayo ina maana hawana

1173
00:54:41,100 --> 00:54:42,670
kukusanya ndani zeros na ndio.

1174
00:54:42,670 --> 00:54:43,690
Wewe tu kukimbia.

1175
00:54:43,690 --> 00:54:47,680
Lakini nini tofauti kimsingi na
JavaScript kawaida ni kwamba

1176
00:54:47,680 --> 00:54:49,815
si kuendesha kwenye mtandao kompyuta yako.

1177
00:54:49,815 --> 00:54:52,570
Haina kupata kukimbia katika
appliance per se.

1178
00:54:52,570 --> 00:54:57,490
Badala yake, anapata kupakuliwa kwa mtumiaji
kupitia HTTP katika browser yao -

1179
00:54:57,490 --> 00:55:00,260
Chrome, Safari, Internet Explorer,
Firefox, chochote -

1180
00:55:00,260 --> 00:55:03,860
na ni browser kwamba executes hii
hasa lugha ya programu.

1181
00:55:03,860 --> 00:55:08,000
>> Hivyo kuwa wazi, PHP hivi sasa imekuwa
kunyongwa aidha katika mstari amri katika

1182
00:55:08,000 --> 00:55:11,290
nyeusi na nyeupe yetu dirisha, juu ya server
kama appliance, kompyuta

1183
00:55:11,290 --> 00:55:14,490
kama appliance, au imekuwa ni
kuuawa kwa mtandao wa kompyuta

1184
00:55:14,490 --> 00:55:15,860
mbio juu ya kompyuta.

1185
00:55:15,860 --> 00:55:20,490
Lakini mandhari hapa ni kwamba PHP hivi sasa
imekuwa kunyongwa server-upande, hivyo

1186
00:55:20,490 --> 00:55:24,820
user na browser mtumiaji
kamwe kuona mstari wa PHP code.

1187
00:55:24,820 --> 00:55:28,530
>> Kwa kweli, kama wewe milele wazi browser kwa
tovuti yako au nyingine na

1188
00:55:28,530 --> 00:55:32,400
kweli kuona PHP code katika dirisha yako,
mtu ana Star up.

1189
00:55:32,400 --> 00:55:34,950
Kwa sababu haina maana kuwa
alimtuma browser moja kwa moja.

1190
00:55:34,950 --> 00:55:38,150
Ni walidhani wauawe na akageuka
katika kitu kama HTML.

1191
00:55:38,150 --> 00:55:40,120
>> Lakini JavaScript kimsingi ni
kinyume.

1192
00:55:40,120 --> 00:55:44,350
Ni maana ya kuwa na kukimbia kawaida ndani ya
wa mtumiaji browser window.

1193
00:55:44,350 --> 00:55:46,840
Na ni aina gani ya tovuti kutumia
JavaScript kisha siku hizi?

1194
00:55:46,840 --> 00:55:49,640

1195
00:55:49,640 --> 00:55:52,180
>> Kama literally kila tovuti maarufu.

1196
00:55:52,180 --> 00:55:55,430
Kila tovuti ya kuwa wewe guys pengine
matumizi ya kila siku kutumia JavaScript kwa

1197
00:55:55,430 --> 00:55:57,330
rahisi na hata
sexiest makala.

1198
00:55:57,330 --> 00:55:59,800
>> Hivyo kitu kama Facebook
Kuzungumza kama wewe kutumia.

1199
00:55:59,800 --> 00:56:01,040
Jinsi gani kwamba kweli kazi?

1200
00:56:01,040 --> 00:56:05,090
Vizuri hivi sasa, yote ya mambo ya tumekuwa
kufanyika kwa HTML na PHP akubali kwamba

1201
00:56:05,090 --> 00:56:08,750
kuvuta up URL, na wewe hit kuingia,
na unaweza kuona baadhi ya maudhui HTML.

1202
00:56:08,750 --> 00:56:11,970
Na bonyeza kiungo, kwamba mabadiliko ya
URL, mabadiliko ya ukurasa, na reloads

1203
00:56:11,970 --> 00:56:12,740
baadhi ya maudhui mpya.

1204
00:56:12,740 --> 00:56:16,340
Bonyeza URL mwingine au kuwasilisha fomu, unaweza
kupata whisked kwenye ukurasa mwingine na

1205
00:56:16,340 --> 00:56:17,420
unaweza kuona baadhi ya mambo mapya.

1206
00:56:17,420 --> 00:56:22,710
>> Lakini kwa kutumia kitu kama Facebook Chat,
au Gchat, au Maps Google, mara chache

1207
00:56:22,710 --> 00:56:27,350
haina ukurasa mzima mahitaji kama kwamba
unaweza kuona screen nyeupe kwa muda na

1208
00:56:27,350 --> 00:56:28,470
kisha mambo mapya.

1209
00:56:28,470 --> 00:56:32,610
Badala yake, kurasa za mtandao leo ni dynamically
kupata updated tena na

1210
00:56:32,610 --> 00:56:35,570
tena na tena kila aina
ya nyuma ya pazia.

1211
00:56:35,570 --> 00:56:38,560
Na zinageuka kuwa wakati huna kwenda
kitu kama Facebook, au Gchat,

1212
00:56:38,560 --> 00:56:43,050
au Gmail, na ukurasa updates
moja kwa moja bila kupakia upya

1213
00:56:43,050 --> 00:56:47,630
screen nzima, nini kilichotokea ni kwamba
ya browser yako imefanya aina ya siri

1214
00:56:47,630 --> 00:56:49,410
HTTP maombi ya ziada -

1215
00:56:49,410 --> 00:56:52,740
si kwa kurasa nzima ya mtandao, lakini tu kwa ajili ya
chunks kidogo ya data, kama

1216
00:56:52,740 --> 00:56:55,740
ujumbe wa papo kwamba rafiki yako tu
alimtuma wewe, au hali update kwamba

1217
00:56:55,740 --> 00:56:58,210
mtu tukakutumia, au tweet
kwamba mtu tu alimtuma.

1218
00:56:58,210 --> 00:57:02,120
Ni maamuzi tu maombi kidogo kwa ajili ya
data, na kisha kwa kutumia JavaScript, hii

1219
00:57:02,120 --> 00:57:06,370
lugha ya programu, kubadili kile
ukurasa wa mtandao inaonekana kama bila

1220
00:57:06,370 --> 00:57:09,860
server kusaidia, bila server
kuzalisha kwamba HTML.

1221
00:57:09,860 --> 00:57:13,820
>> Hivyo katika muda mfupi, JavaScript inaweza kutumika kisha
si tu kuchota data mpya kutoka

1222
00:57:13,820 --> 00:57:16,750
server bila kupakia upya zima
ukurasa au kuwasilisha fomu.

1223
00:57:16,750 --> 00:57:20,060
Ni pia inaweza kutumika na mabadiliko ya
kinachojulikana DOM -

1224
00:57:20,060 --> 00:57:21,520
hati kitu mfano -

1225
00:57:21,520 --> 00:57:24,620
ambayo ni njia tu dhana kwa
akisema mti wa HTML

1226
00:57:24,620 --> 00:57:26,220
kuwa tuliona wakati wa mwisho.

1227
00:57:26,220 --> 00:57:31,640
>> Hivyo kuwahakikishia, JavaScript ni
syntactically hivyo sawa na C kama vizuri.

1228
00:57:31,640 --> 00:57:32,820
Hakuna kazi kuu ni.

1229
00:57:32,820 --> 00:57:35,430
Wewe tu kuanza kuandika code
na itakuwa kupata kuuawa, au

1230
00:57:35,430 --> 00:57:36,900
kutafsiriwa vizuri zaidi.

1231
00:57:36,900 --> 00:57:38,660
Hali itakuwa kuangalia kama hii.

1232
00:57:38,660 --> 00:57:41,230
Hakuna tofauti na C au
PHP kwa jambo hilo.

1233
00:57:41,230 --> 00:57:43,890
Maneno Boolean au-ed pamoja
kuangalia kama hii.

1234
00:57:43,890 --> 00:57:45,590
Anded pamoja kuangalia kama hii.

1235
00:57:45,590 --> 00:57:47,750
>> Swichi kuangalia kama hii.

1236
00:57:47,750 --> 00:57:49,440
Kwa loops kuangalia kama hii.

1237
00:57:49,440 --> 00:57:51,060
Wakati loops kuangalia kama hii.

1238
00:57:51,060 --> 00:57:53,316
Je, wakati tanzi kuangalia kama hii.

1239
00:57:53,316 --> 00:57:54,780
>> Hii ni mpya.

1240
00:57:54,780 --> 00:57:58,753
Hivyo JavaScript ina si foreach
kujenga per se, lakini kujenga hii

1241
00:57:58,753 --> 00:58:03,870
kwa kutofautiana i katika safu, na i katika hii
kesi inakuwa thamani index.

1242
00:58:03,870 --> 00:58:06,880
Hivyo ni kidogo tofauti na ile
foreach, ingawa matoleo mapya ya

1243
00:58:06,880 --> 00:58:10,280
JavaScript ni kuja nje wakati wote,
hivyo hata makala haya lugha

1244
00:58:10,280 --> 00:58:10,880
ni kutoa.

1245
00:58:10,880 --> 00:58:16,920
>> Na kama kando, JavaScript siku hizi
pia inaweza kutumika kwenye kompyuta tu kama

1246
00:58:16,920 --> 00:58:19,920
PHP kwa kutumia mfumo aitwaye Node.js.

1247
00:58:19,920 --> 00:58:24,670
Moja ya CS50 ya TFS, Kevin, imesababisha
semina ya Node.js hiyo inapatikana katika

1248
00:58:24,670 --> 00:58:26,440
cs50.net/seminars.

1249
00:58:26,440 --> 00:58:28,830
Hivyo kama wewe ni curious, tunajua kwamba wewe
Unaweza kutumia hili upande wa server kama

1250
00:58:28,830 --> 00:58:33,870
vizuri, lakini hiyo ni mwenendo haki ya hivi karibuni,
lakini nguvu moja wakati huo.

1251
00:58:33,870 --> 00:58:35,270
>> Hii ni tofauti kidogo.

1252
00:58:35,270 --> 00:58:37,910
Hii ni safu katika JavaScript.

1253
00:58:37,910 --> 00:58:40,115
Na nini mgomo wewe kama mbalimbali
dhidi ya C au PHP?

1254
00:58:40,115 --> 00:58:43,890

1255
00:58:43,890 --> 00:58:47,420
Kuna hadithi chache haraka
tunaweza kujua hapa.

1256
00:58:47,420 --> 00:58:49,367
Kinachokosekana dhidi ya PHP?

1257
00:58:49,367 --> 00:58:51,652
>> Watazamaji: [inaudible].

1258
00:58:51,652 --> 00:58:52,110
>> DAVID Malan: Ndiyo?

1259
00:58:52,110 --> 00:58:53,322
Sorry, kusema tena?

1260
00:58:53,322 --> 00:58:54,740
>> Watazamaji: Si kutangaza
aina ya kutofautiana.

1261
00:58:54,740 --> 00:58:56,390
>> DAVID Malan: Sisi siyo kutangaza
aina ya kutofautiana.

1262
00:58:56,390 --> 00:58:59,630
Hivyo kweli kabisa kama PHP, sisi siyo
kubainisha aina ya kutofautiana hii.

1263
00:58:59,630 --> 00:59:02,670
Badala yake, sisi ni zaidi yaliyotokea
akisema var kwa kutofautiana.

1264
00:59:02,670 --> 00:59:06,690
Hatuna kero PHP ya
dola ishara, ambayo wakati kwa tedious

1265
00:59:06,690 --> 00:59:09,160
aina, haina kufanya zaidi wazi kwamba
kitu ni kutofautiana.

1266
00:59:09,160 --> 00:59:11,830
Wakati hapa, sisi ni aina ya nyuma
Mbinu C ya kwa kupiga tu

1267
00:59:11,830 --> 00:59:14,500
variable kwa jina tunataka
kwa kufanya hivyo, kama idadi.

1268
00:59:14,500 --> 00:59:17,170
Na pia kama PHP, tuna
mabano mraba kwa

1269
00:59:17,170 --> 00:59:19,170
maadili ndani ya kuwa safu.

1270
00:59:19,170 --> 00:59:22,490
>> Hivyo vigezo katika JavaScript pia
ili kuangalia kama hii.

1271
00:59:22,490 --> 00:59:26,900
Taarifa hapa hii ni string kuitwa s,
lakini vile vile na sisi si fulani

1272
00:59:26,900 --> 00:59:28,750
kwamba ni kamba.

1273
00:59:28,750 --> 00:59:33,160
Hapa ingawa ni kipengele kwamba haina
kuwepo katika njia sawa katika PHP,

1274
00:59:33,160 --> 00:59:34,460
lakini kidogo vile vile.

1275
00:59:34,460 --> 00:59:36,530
Hii ni kitu katika JavaScript.

1276
00:59:36,530 --> 00:59:42,110
Na vitu ni aina ya Swiss Army
Kisu ya muundo data kwa kuwa

1277
00:59:42,110 --> 00:59:43,900
wanaweza kuzitumia kwa idadi yoyote ya mambo.

1278
00:59:43,900 --> 00:59:46,860
>> Hapa, kwa mfano, sisi ni kutangaza
variable kuitwa quote.

1279
00:59:46,860 --> 00:59:49,110
aina ya kwamba variable
ni kitu.

1280
00:59:49,110 --> 00:59:53,550
Unaweza kufikiria hili kama C struct
kwamba ana funguo na maadili.

1281
00:59:53,550 --> 00:59:55,250
Ni ishara muhimu.

1282
00:59:55,250 --> 00:59:57,350
FB ni thamani, inaonekana
hisa alama.

1283
00:59:57,350 --> 00:59:57,930
Comma.

1284
00:59:57,930 --> 01:00:02,180
Bei ni muhimu nyingine, na thamani yake ni
inaonekana hatua yaliyo, au a

1285
01:00:02,180 --> 01:00:06,510
idadi kwa ujumla zaidi katika
JavaScript, ya $ 49.26.

1286
01:00:06,510 --> 01:00:09,030
>> Hivyo PHP hana -

1287
01:00:09,030 --> 01:00:12,980
hatujaona katika PHP vitu kabisa
kama hii, lakini hatukuwa kuona Analog,

1288
01:00:12,980 --> 01:00:14,093
ambayo ilikuwa nini?

1289
01:00:14,093 --> 01:00:14,980
>> Watazamaji: [inaudible].

1290
01:00:14,980 --> 01:00:16,110
>> DAVID Malan: associative arrays.

1291
01:00:16,110 --> 01:00:19,990
Hivyo ambapo PHP ina arrays associative
ambao syntax ni milele kidogo ili

1292
01:00:19,990 --> 01:00:20,370
tofauti -

1293
01:00:20,370 --> 01:00:21,780
tuliona mabano mraba.

1294
01:00:21,780 --> 01:00:23,860
Tuliona weird mishale alama.

1295
01:00:23,860 --> 01:00:27,330
JavaScript ina vitu, lakini hii ni
zaidi tofauti semantic na a

1296
01:00:27,330 --> 01:00:29,260
kisawe mbalimbali kwa sasa.

1297
01:00:29,260 --> 01:00:35,060
Hata hivyo, kama kando, PHP pia ina
vitu kwa njia ambayo Java na nyingine

1298
01:00:35,060 --> 01:00:37,810
lugha na vitu katika
kifaa-oriented programu.

1299
01:00:37,810 --> 01:00:40,440
Lakini tutaweza kutumia haya tu
kwa ajili ya aina data kwa sasa.

1300
01:00:40,440 --> 01:00:42,170
Vitu na associative arrays.

1301
01:00:42,170 --> 01:00:44,140
>> Hii mtu anaweza kufanya hivyo
kidogo zaidi ya wazi.

1302
01:00:44,140 --> 01:00:45,890
Hapa ni kwa nini kitu ni muhimu.

1303
01:00:45,890 --> 01:00:48,760
Wakati unataka kutangaza mwanafunzi,
kama Zamyla, tunaweza kweli

1304
01:00:48,760 --> 01:00:52,630
kurejelea hivyo kusema ndani ya kwamba
kitu kwa kutumia mabano curly tu kama

1305
01:00:52,630 --> 01:00:55,060
kabla ya rundo zima la funguo
na maadili katika hapa.

1306
01:00:55,060 --> 01:00:59,150
Tuna ID, nyumba, na jina kwa
Zamyla, ikifuatiwa na semicolon kama

1307
01:00:59,150 --> 01:01:00,690
kawaida katika mwisho.

1308
01:01:00,690 --> 01:01:04,840
>> Hapa chini pia, hii ni kidogo
mbalimbali, lakini pia nguvu sana

1309
01:01:04,840 --> 01:01:05,690
siku hizi.

1310
01:01:05,690 --> 01:01:08,780
Hapa ni safu, na mimi kujua kwamba kwa sababu
kuna mraba mabano up

1311
01:01:08,780 --> 01:01:11,090
juu na bracket mraba
chini.

1312
01:01:11,090 --> 01:01:16,050
Na hii ni safu ya data nini
aina inaonekana katika JavaScript?

1313
01:01:16,050 --> 01:01:21,260
Hii ni safu ya inaonekana
kama vitu tatu.

1314
01:01:21,260 --> 01:01:24,580
Na Mimi najua ni kitu tu
kwa sababu ya braces curly.

1315
01:01:24,580 --> 01:01:28,760
Na taarifa kuna wazi curly brace,
baadhi ya mambo, karibu curly brace, comma,

1316
01:01:28,760 --> 01:01:31,180
kisha baadhi zaidi, comma,
na kisha baadhi zaidi.

1317
01:01:31,180 --> 01:01:33,800
Hivyo kwamba ni hoja tatu
kutengwa kwa koma mbili.

1318
01:01:33,800 --> 01:01:36,810
>> Hivyo hii ni safu ya vitu tatu.

1319
01:01:36,810 --> 01:01:39,940
Na kila mmoja wa wale vitu inaonekana kuwa
mwanafunzi au wafanyakazi mwanachama wa baadhi

1320
01:01:39,940 --> 01:01:42,370
aina, kila mmoja kwa ID,
nyumba, na jina.

1321
01:01:42,370 --> 01:01:45,060
Lakini nimepata kuitwa hii kitu
aitwaye JSON -

1322
01:01:45,060 --> 01:01:47,450
JavaScript Object nukuu.

1323
01:01:47,450 --> 01:01:52,060
Na hii ni format data kwamba kweli
ni maarufu sana na katika

1324
01:01:52,060 --> 01:01:55,100
vogue siku hizi kwamba kama wewe kuandika
maombi kwamba anatumia Facebook

1325
01:01:55,100 --> 01:01:59,150
API, Twitter API, kweli karibu
API yoyote huko nje siku hizi,

1326
01:01:59,150 --> 01:02:02,820
ikiwa ni pamoja na baadhi ya CS50 mwenyewe,
data kupata nyuma ni si katika

1327
01:02:02,820 --> 01:02:04,720
umri wa shule ya CSV format.

1328
01:02:04,720 --> 01:02:06,780
>> Kwa sababu kukumbuka kwamba CSV
ni super rahisi.

1329
01:02:06,780 --> 01:02:10,230
Ni nguzo tu kutengwa
kwa koma.

1330
01:02:10,230 --> 01:02:13,190
JSON data anatoa metadata zaidi.

1331
01:02:13,190 --> 01:02:17,800
Ni washirika muhimu kwa kila thamani hivyo
hawana kudhani tu kwamba

1332
01:02:17,800 --> 01:02:22,460
safu 0 ni thamani moja, safu
moja ni mwingine, safu mbili ni mwingine.

1333
01:02:22,460 --> 01:02:26,790
Kila kitu katika JSON kitu hapa ni aina
binafsi kuelezea, kwa sababu kila

1334
01:02:26,790 --> 01:02:30,940
moja ya majina katika file hii ina literally
jina mbele yake kama

1335
01:02:30,940 --> 01:02:32,510
alinukuliwa kamba.

1336
01:02:32,510 --> 01:02:34,950
>> Hivyo basi tuangalie a
mifano michache hapa.

1337
01:02:34,950 --> 01:02:36,800
Hebu kwenda katika appliance.

1338
01:02:36,800 --> 01:02:41,000
Na napenda kwenda katika vhost wetu
directory katika umma.

1339
01:02:41,000 --> 01:02:45,590
Na napenda kwenda katika
JavaScript directory.

1340
01:02:45,590 --> 01:02:49,610
Na hebu kwenda mbele na kufungua
dom-0.html, ambapo DOM tu ina maana

1341
01:02:49,610 --> 01:02:51,010
hati kitu mfano wa kuigwa.

1342
01:02:51,010 --> 01:02:53,490
Ni mambo ya mti ambayo
Mimi inajulikana mapema.

1343
01:02:53,490 --> 01:02:54,950
>> Na napenda kupendekeza yafuatayo.

1344
01:02:54,950 --> 01:02:57,720
Hapa ni ukurasa wa mtandao ambao
mwili ni pretty rahisi.

1345
01:02:57,720 --> 01:03:00,170
Hivyo chini hapa chini,
taarifa mimi na aina.

1346
01:03:00,170 --> 01:03:01,500
Tumeona wale walio kuwa kabla.

1347
01:03:01,500 --> 01:03:07,600
Ina pembejeo mbili, moja ambayo ina
ID ya jina, moja ambayo ina aina ya

1348
01:03:07,600 --> 01:03:09,830
Waislamu, na kwanza
aina moja ni maandishi.

1349
01:03:09,830 --> 01:03:11,900
Hivyo hii kweli sauti pretty rahisi.

1350
01:03:11,900 --> 01:03:13,090
>> Hebu nenda hapa.

1351
01:03:13,090 --> 01:03:15,390
Hebu kwenda nyuma ya ukurasa huu hapa.

1352
01:03:15,390 --> 01:03:21,030
Hebu kwenda katika localhost, na kwenda katika
JavaScript orodha yetu, na kwenda

1353
01:03:21,030 --> 01:03:24,640
dom-0, na hapa tuna fomu hii.

1354
01:03:24,640 --> 01:03:26,550
Hivyo kwamba ni inaonekana
ukurasa hii yote gani.

1355
01:03:26,550 --> 01:03:28,740
Ni ana shamba jina na
a Kuwasilisha kifungo.

1356
01:03:28,740 --> 01:03:30,340
Lakini mimi si kwenda kutumia PHP hapa.

1357
01:03:30,340 --> 01:03:34,310
Mimi nina kwenda kufanya upande kila kitu mteja
hivyo kusema katika JavaScript kama ifuatavyo.

1358
01:03:34,310 --> 01:03:39,100
>> Taarifa kwamba nimepata kweli kutokana na jina
uwanja wa pembejeo hii ya kipekee

1359
01:03:39,100 --> 01:03:42,350
kitambulisho, ambayo kwa kweli
ila mimi wakati baadhi katika wakati huu.

1360
01:03:42,350 --> 01:03:45,480
Na taarifa nimekuwa ilianzisha tag mwingine
katika kichwa cha mtandao ukurasa wangu,

1361
01:03:45,480 --> 01:03:46,565
 tag.

1362
01:03:46,565 --> 01:03:50,120
>> Hivyo ni kwa maana hii kwamba JavaScript ni
mteja upande lugha ya programu.

1363
01:03:50,120 --> 01:03:55,020
Katika kesi hiyo, kama CSS, Nimekuwa kuweka
ni moja kwa moja ndani ya HTML yangu.

1364
01:03:55,020 --> 01:03:58,810
Lakini taarifa nimekuwa alitangaza kazi
kwamba inaonekana kidogo kama PHP

1365
01:03:58,810 --> 01:04:01,530
syntactically, lakini hii ni kweli
JavaScript, kwa sababu tena, ni

1366
01:04:01,530 --> 01:04:03,920
mteja upande katika browser.

1367
01:04:03,920 --> 01:04:07,590
Na kuchukua nadhani jambo hili ni kwenda
kufanya, hata ingawa baadhi ya syntax

1368
01:04:07,590 --> 01:04:09,338
hapa ni mpya.

1369
01:04:09,338 --> 01:04:11,760
>> Watazamaji: Sema hello yeyote.

1370
01:04:11,760 --> 01:04:14,020
>> DAVID Malan: Ni kwenda kusema hello
yeyote ziara ukurasa huu.

1371
01:04:14,020 --> 01:04:15,120
Hivyo vipi?

1372
01:04:15,120 --> 01:04:18,070
>> Hivyo taarifa, ni zamu nje katika JavaScript
kuna macho () kazi.

1373
01:04:18,070 --> 01:04:22,840
Hii ni kazi sana aina ya kusikitisha kwamba
kweli tu huelekea waudhi watumiaji.

1374
01:04:22,840 --> 01:04:25,440
Siyo moja unapaswa kweli kutumia
kawaida, lakini ni ya haraka na chafu

1375
01:04:25,440 --> 01:04:27,710
njia ya aina ya uchapishaji kitu
kwa mtumiaji graphical

1376
01:04:27,710 --> 01:04:29,180
interface, kama browser.

1377
01:04:29,180 --> 01:04:31,400
Taarifa hapa kwamba mimi nimepata
kamba katika quotes moja.

1378
01:04:31,400 --> 01:04:36,010
Ni zinageuka kuwa tofauti na C, JavaScript
unaweza kweli na matumizi ya moja

1379
01:04:36,010 --> 01:04:38,730
ananukuu, na kusema ukweli ni tu aina
ya mkataba kati ya Stylistic

1380
01:04:38,730 --> 01:04:41,180
JavaScript programmers
kutumia quotes moja.

1381
01:04:41,180 --> 01:04:43,750
PHP, kweli kuwa kidogo
maana tofauti.

1382
01:04:43,750 --> 01:04:45,810
Lakini kwa sasa, tu kujua kwamba
hiyo ni sababu tu.

1383
01:04:45,810 --> 01:04:49,270
mkataba katika JavaScript ni mara nyingi kwa
kutumia quotes moja, lakini tunaweza kutumia

1384
01:04:49,270 --> 01:04:50,950
quotes mbili katika maeneo yote pia.

1385
01:04:50,950 --> 01:04:52,610
>> Hivyo hii ni ya kuvutia.

1386
01:04:52,610 --> 01:04:56,430
Kumbuka mwisho wakati huo tulikuwa na kwamba
picha juu ya screen waliotumia mti

1387
01:04:56,430 --> 01:04:59,720
ambapo alikuwa HTML node, na
kichwa node, na node mwili,

1388
01:04:59,720 --> 01:05:00,800
na kisha baadhi maandishi.

1389
01:05:00,800 --> 01:05:04,700
Lakini kulikuwa na mtu mmoja maalum node katika
juu sana kwamba mimi kuitwa hati.

1390
01:05:04,700 --> 01:05:08,260
Naam, ni zamu nje katika JavaScript, yoyote
wakati kuandika mpango katika JavaScript

1391
01:05:08,260 --> 01:05:11,040
katika browser, unaweza kupata
maalum wa kimataifa kutofautiana.

1392
01:05:11,040 --> 01:05:14,130
Sawa katika roho superglobals PHP ya,
hii moja inaitwa katika

1393
01:05:14,130 --> 01:05:16,050
wote lowercase hati.

1394
01:05:16,050 --> 01:05:21,480
>> Ni kama struct, lakini struct hii
pia ina kazi ndani yake.

1395
01:05:21,480 --> 01:05:23,790
Hivyo C struct tu ana data kawaida.

1396
01:05:23,790 --> 01:05:29,060
Lakini JavaScript kitu kama hii
kitaalam ni pia ina kazi,

1397
01:05:29,060 --> 01:05:31,830
inayojulikana kama mbinu,
ndani yake.

1398
01:05:31,830 --> 01:05:35,750
Na unaweza kupiga kazi ndani ya
hii kitu halisi kabisa kufanya yake

1399
01:05:35,750 --> 01:05:39,610
jina, dot, na kisha jina la
kazi, au tena mbinu.

1400
01:05:39,610 --> 01:05:41,160
Ni tu kisawe, kwa kweli.

1401
01:05:41,160 --> 01:05:42,450
>> Na nini kazi hii nini?

1402
01:05:42,450 --> 01:05:43,840
Unaweza aina ya nadhani kutoka jina lake.

1403
01:05:43,840 --> 01:05:45,590
Kupata hiki na ID.

1404
01:05:45,590 --> 01:05:50,040
Hivyo hii ni kwenda kutafuta ukurasa mtandao,
kutafuta mti huo, kuangalia kwa

1405
01:05:50,040 --> 01:05:55,210
chochote node, AKA hiki, ina
kipekee ID ya kunukuu unquote jina.

1406
01:05:55,210 --> 01:05:56,560
Na kisha nini mimi kwenda kufanya nini?

1407
01:05:56,560 --> 01:06:00,350
Mimi nina kwenda kupata thamani ndani ya
kwamba node katika mti, na mimi nina kwenda

1408
01:06:00,350 --> 01:06:02,580
kwa namna fulani kusema hello jina hilo.

1409
01:06:02,580 --> 01:06:05,360
>> Hivyo kuchukua nadhani, hata kama sisi wameweza si
kuonekana hii bado, je, pamoja na

1410
01:06:05,360 --> 01:06:07,396
alama maana hapa na hapa pengine?

1411
01:06:07,396 --> 01:06:08,230
>> Watazamaji: concatenate.

1412
01:06:08,230 --> 01:06:09,220
>> DAVID Malan: concatenate.

1413
01:06:09,220 --> 01:06:11,290
Haki, na haya ni
aina ya kubuni maamuzi

1414
01:06:11,290 --> 01:06:12,280
watu alifanya miaka iliyopita.

1415
01:06:12,280 --> 01:06:15,190
Katika PHP, wewe concatenate
mambo kwa dots.

1416
01:06:15,190 --> 01:06:18,800
Katika C, kuruka kupitia hoops kadhaa na
kuwaita kazi kama strcopy () au

1417
01:06:18,800 --> 01:06:20,600
strcat () au kazi nyingine kama hizo.

1418
01:06:20,600 --> 01:06:22,060
Lakini katika JavaScript, unaweza kutumia pluses.

1419
01:06:22,060 --> 01:06:24,770
Hivyo hii ni concatenating tu
masharti tatu -

1420
01:06:24,770 --> 01:06:27,850
hello, jina, na kisha
mshangao uhakika.

1421
01:06:27,850 --> 01:06:30,390
>> Hivyo wakati na kwa nini ni kazi hii
aitwaye ingawa?

1422
01:06:30,390 --> 01:06:33,150
Naam, kuchukua nadhani kutoka
HTML chini.

1423
01:06:33,150 --> 01:06:35,810
Kwa nini ni kusalimiana () iitwayo, au wakati?

1424
01:06:35,810 --> 01:06:39,730

1425
01:06:39,730 --> 01:06:44,030
>> Inavyoonekana, kama bora naweza kuwaambia, juu ya
kuwasilisha, wakati fomu hii ni in,

1426
01:06:44,030 --> 01:06:47,200
Mimi nina kwenda kufanya chochote ni
ndani ya quotes haya.

1427
01:06:47,200 --> 01:06:50,900
Na hasa, mimi nina kwenda kuwaita
kusalimiana () na kisha kurudi uongo.

1428
01:06:50,900 --> 01:06:53,090
>> Naam, hebu angalia nini wavu
athari hapa ni ya kwanza.

1429
01:06:53,090 --> 01:06:58,290
Hivyo basi mimi kwenda mbele na aina
katika, kusema, Loren, Kuwasilisha.

1430
01:06:58,290 --> 01:06:59,440
Habari Loren.

1431
01:06:59,440 --> 01:07:02,990
Hebu tuone kama labda hii ilikuwa ni
bahati utekelezaji.

1432
01:07:02,990 --> 01:07:03,200
Nope.

1433
01:07:03,200 --> 01:07:05,990
Hivyo ni kuandika nje chochote
jina mimi kwa kweli kuweka huko.

1434
01:07:05,990 --> 01:07:07,970
>> Lakini taarifa ya nini si kubadilika.

1435
01:07:07,970 --> 01:07:10,360
URL bado ni dom-0.html.

1436
01:07:10,360 --> 01:07:11,820
Hakuna register.php.

1437
01:07:11,820 --> 01:07:13,110
Hakuna faili pili ni.

1438
01:07:13,110 --> 01:07:14,930
Hakuna sifa action.

1439
01:07:14,930 --> 01:07:19,720
Kwa hiyo kile ni uongo kurudi
labda kufanya?

1440
01:07:19,720 --> 01:07:23,660
Kwa nini mimi wito kusalimiana () na kisha
kurudi uongo pengine?

1441
01:07:23,660 --> 01:07:26,420
Nini kawaida hutokea wakati bonyeza
Kuwasilisha fomu kwamba hata sisi na

1442
01:07:26,420 --> 01:07:27,854
kuonekana katika kipindi cha wiki?

1443
01:07:27,854 --> 01:07:29,900
>> Watazamaji: [inaudible].

1444
01:07:29,900 --> 01:07:30,860
>> DAVID Malan: Ni huenda mahali fulani, right?

1445
01:07:30,860 --> 01:07:32,720
Unaendelea na baadhi URL marudio.

1446
01:07:32,720 --> 01:07:34,120
Lakini mimi sitaki kuwa kutokea hapa.

1447
01:07:34,120 --> 01:07:37,620
Nataka mtandao ukurasa yangu kuwa kabisa
nguvu kama Gmail, ambapo mara moja uko

1448
01:07:37,620 --> 01:07:38,650
huko, kukaa huko.

1449
01:07:38,650 --> 01:07:42,900
URL haina mabadiliko katika njia ambayo
inaonyesha ukurasa yote kupakia upya.

1450
01:07:42,900 --> 01:07:46,680
Badala yake, mimi nataka tu mabadiliko ya kitu fulani
kama uchapishaji nje kitu

1451
01:07:46,680 --> 01:07:48,320
hapa juu ya screen.

1452
01:07:48,320 --> 01:07:49,630
>> Vizuri basi mimi safi hii
up kidogo.

1453
01:07:49,630 --> 01:07:55,370
Hebu kufungua si dom-0, lakini
napenda kufungua dom-2.

1454
01:07:55,370 --> 01:07:57,350
Hivyo tu wameweza kuona baadhi syntax hapa.

1455
01:07:57,350 --> 01:08:02,080
>> Ni zinageuka kuwa kile sisi tu
hakuwa ni kutumia mbichi JavaScript.

1456
01:08:02,080 --> 01:08:04,420
Hivyo hii ni kweli lugha
JavaScript.

1457
01:08:04,420 --> 01:08:07,340
Baadhi ya unaweza kujua ya
maktaba aitwaye jQuery.

1458
01:08:07,340 --> 01:08:09,980
>> Hivyo jQuery si sawa
kitu kama JavaScript.

1459
01:08:09,980 --> 01:08:14,110
Ni tu maktaba kwamba kweli smart
guy aliandika na umaarufu kama

1460
01:08:14,110 --> 01:08:18,100
kuwa karibu kila mtu katika dunia ya sasa
anatumia jQuery wakati wa kutumia JavaScript.

1461
01:08:18,100 --> 01:08:20,890
Na katika mtazamo wa kwanza, uaminifu, ni
inaonekana cryptic kidogo zaidi.

1462
01:08:20,890 --> 01:08:24,990
Lakini utapata, hasa kama wewe kwenda
huko kwa ajili ya mradi wako wa mwisho na mtandao

1463
01:08:24,990 --> 01:08:29,029
maendeleo, utapata kwamba hii
Anasafisha mambo juu na Huwaokoeni kabisa

1464
01:08:29,029 --> 01:08:30,229
mistari michache ya kificho.

1465
01:08:30,229 --> 01:08:33,189
>> Hivyo basi tu mtazamo jinsi
fomu hii ni kazi.

1466
01:08:33,189 --> 01:08:35,664
Taarifa gani mimi kuondoa inaonekana
kutoka HTML yangu?

1467
01:08:35,664 --> 01:08:38,240

1468
01:08:38,240 --> 01:08:40,630
Hakuna juu ya kuwasilisha handler
hivyo kusema.

1469
01:08:40,630 --> 01:08:41,470
Hakuna sifa.

1470
01:08:41,470 --> 01:08:43,359
Kwa sababu unajua, ni nini
Mimi si kweli kama?

1471
01:08:43,359 --> 01:08:45,640
Nilihisi kama sisi walikuwa kuanguka
ndani ya tabia za zamani huko.

1472
01:08:45,640 --> 01:08:49,340
Tu kama ni kuanzia kujisikia sloppy
kwa intermingle wote CSS kwa

1473
01:08:49,340 --> 01:08:52,149
HTML, kwa sababu wewe ni aina ya kutupa
lugha mbalimbali duniani

1474
01:08:52,149 --> 01:08:56,180
mahali, vile vile gani hii kuanza kujisikia
kama barabara mbaya kwenda chini ambapo

1475
01:08:56,180 --> 01:09:01,069
Mimi nina kuweka JavaScript code ndani ya yangu
HTML badala ya factoring nje.

1476
01:09:01,069 --> 01:09:02,279
>> Ili somo hapa.

1477
01:09:02,279 --> 01:09:05,080
Katika dom-2.html, mimi nina factoring nje.

1478
01:09:05,080 --> 01:09:07,399
Na mimi nina kufanya mambo kidogo
tofauti.

1479
01:09:07,399 --> 01:09:09,630
Kwa sasa, mimi nina kwenda wimbi mikono yangu
nini hii kweli haina

1480
01:09:09,630 --> 01:09:10,590
chini ya kofia.

1481
01:09:10,590 --> 01:09:14,210
Lakini tu kwa sasa kudhani kwamba kwanza
mstari wa kanuni katika maktaba hii

1482
01:09:14,210 --> 01:09:18,170
aitwaye jQuery tu ina maana wakati
hati ni tayari, kufanya yafuatayo.

1483
01:09:18,170 --> 01:09:20,080
>> Kwa sababu kurasa za mtandao wanaweza kuchukua
muda wa kupakia.

1484
01:09:20,080 --> 01:09:23,029
Unaweza kuwa na kwenye mtandao polepole
uhusiano, na inaweza kuwa inazunguka

1485
01:09:23,029 --> 01:09:25,290
na inazunguka, na hatimaye ni kubeba.

1486
01:09:25,290 --> 01:09:29,060
Kwamba mstari wa kanuni tu anasema kusubiri hadi
ukurasa mzima ni tayari, hati

1487
01:09:29,060 --> 01:09:31,189
ni tayari, kabla ya utekelezaji wa kanuni hii.

1488
01:09:31,189 --> 01:09:34,390
>> Na sasa taarifa, hii pengine ni
muhimu sana kwanza

1489
01:09:34,390 --> 01:09:36,189
kuchukua mbali na jQuery.

1490
01:09:36,189 --> 01:09:42,140
Mstari huu hapa ni sawa sana katika roho
katika mstari huu muda mrefu hapa.

1491
01:09:42,140 --> 01:09:46,920
Wakati katika mbichi JavaScript code, kuna
ipo hati ya kimataifa ya kitu kwamba

1492
01:09:46,920 --> 01:09:50,460
ina kazi kuitwa getElementById (),
watu ambao aliandika

1493
01:09:50,460 --> 01:09:55,720
jQuery kilichorahisishwa kwamba kusema tu
dola ishara, na kisha ndani ya

1494
01:09:55,720 --> 01:10:00,250
mabano kuweka quotes mbili, na kisha
kuweka hash ishara na kufuatiwa na

1495
01:10:00,250 --> 01:10:02,250
kipekee ID unataka kunyakua.

1496
01:10:02,250 --> 01:10:06,170
Hivyo hii ni sawa na
document.getElementById.

1497
01:10:06,170 --> 01:10:11,090
>> Wakati huo huo,. Kuwasilisha tu ina maana juu ya
kuwasilisha aina yoyote wewe ni

1498
01:10:11,090 --> 01:10:14,240
akimaanisha upande wa kushoto, kwenda
mbele na kutekeleza hili.

1499
01:10:14,240 --> 01:10:16,600
Lakini hii ni sasa udadisi pia.

1500
01:10:16,600 --> 01:10:19,560
Nini weird juu ya nini
Nimekuwa yalionyesha hapa?

1501
01:10:19,560 --> 01:10:23,840

1502
01:10:23,840 --> 01:10:28,594
Si tu ni aina ya syntactically
mpya, pia kuna kitu missing.

1503
01:10:28,594 --> 01:10:29,558
>> Watazamaji: Ni tu kuitwa kazi?

1504
01:10:29,558 --> 01:10:31,970
Ni si kuitwa macho?

1505
01:10:31,970 --> 01:10:32,440
>> DAVID Malan: Yeah.

1506
01:10:32,440 --> 01:10:35,450
Vizuri, tahadhari hivyo () ni chini
hapa, kuwa haki.

1507
01:10:35,450 --> 01:10:39,520
Lakini hakuna kutaja ya
jina, kama unajua, foo au

1508
01:10:39,520 --> 01:10:40,980
kitu hapa.

1509
01:10:40,980 --> 01:10:43,830
Na kwa kweli, hii ni moja ya makala
ya JavaScript kwamba kabisa

1510
01:10:43,830 --> 01:10:45,370
nguvu, lakini pia ni mpya kabisa.

1511
01:10:45,370 --> 01:10:47,460
Na PHP kweli ina huu pia.

1512
01:10:47,460 --> 01:10:49,500
>> Hebu kwenda mbele na kufanya
kitu halisi haraka.

1513
01:10:49,500 --> 01:10:52,030
Hebu kwenda mbele na kuweka hii hapa.

1514
01:10:52,030 --> 01:10:52,600
Hebu kufanya hivyo.

1515
01:10:52,600 --> 01:10:53,690
Kazi.

1516
01:10:53,690 --> 01:10:56,455
Hebu piga handler hivi ().

1517
01:10:56,455 --> 01:10:58,290
kazi handler hivyo kusema.

1518
01:10:58,290 --> 01:11:00,110
Kitu ambacho kinafanya baadhi ya operesheni.

1519
01:11:00,110 --> 01:11:02,700
Hebu kusafisha indentation yangu.

1520
01:11:02,700 --> 01:11:04,380
Na kuweka hii hapa.

1521
01:11:04,380 --> 01:11:06,090
Na kuweka kwamba hapa.

1522
01:11:06,090 --> 01:11:06,470
Yep.

1523
01:11:06,470 --> 01:11:07,060
OK.

1524
01:11:07,060 --> 01:11:10,300
>> Basi sasa nina kazi kuitwa
handler () kwamba mimi si kweli kujua

1525
01:11:10,300 --> 01:11:10,890
nini anafanya bado.

1526
01:11:10,890 --> 01:11:12,710
Ni tu bado ina kuwa mambo ya ajabu.

1527
01:11:12,710 --> 01:11:13,900
Whoops.

1528
01:11:13,900 --> 01:11:15,820
Alichukua sana.

1529
01:11:15,820 --> 01:11:18,490
Hebu kufanya hivyo.

1530
01:11:18,490 --> 01:11:18,990
Sawa.

1531
01:11:18,990 --> 01:11:20,240
Sorry.

1532
01:11:20,240 --> 01:11:23,140

1533
01:11:23,140 --> 01:11:23,690
Sawa.

1534
01:11:23,690 --> 01:11:24,720
Hebu kufanya hivyo.

1535
01:11:24,720 --> 01:11:25,020
OK.

1536
01:11:25,020 --> 01:11:27,040
Kwamba inaonekana nzuri na moja kwa moja
mbele sasa.

1537
01:11:27,040 --> 01:11:29,090
Hebu kufanya hivyo.

1538
01:11:29,090 --> 01:11:29,860
Kufanya hivyo.

1539
01:11:29,860 --> 01:11:30,950
Na OK.

1540
01:11:30,950 --> 01:11:33,080
Hivyo sasa, hebu kuweka hii zaidi ya hapa.

1541
01:11:33,080 --> 01:11:35,840

1542
01:11:35,840 --> 01:11:37,270
Programu No zaidi juu ya kuruka.

1543
01:11:37,270 --> 01:11:37,900
OK.

1544
01:11:37,900 --> 01:11:40,000
>> Hivyo sasa, hebu kwenda nyuma ya
ambapo hadithi kuanza.

1545
01:11:40,000 --> 01:11:43,530
Hapo awali, mimi alisema kuwa mstari huu hapa
maana wakati hati ni tayari, kwenda

1546
01:11:43,530 --> 01:11:44,380
mbele na kufanya hivyo.

1547
01:11:44,380 --> 01:11:45,660
Je, mimi unataka kufanya nini?

1548
01:11:45,660 --> 01:11:49,070
Vizuri hasa, nataka kwenda
mbele na kufanya yafuatayo.

1549
01:11:49,070 --> 01:11:53,700
Kutekeleza mstari wa kanuni, na kisha
nini nataka kufanya ni wito huu

1550
01:11:53,700 --> 01:11:56,370
kazi wakati aina ni kuwasilishwa.

1551
01:11:56,370 --> 01:11:57,730
>> Sasa hii ni nini kuvutia.

1552
01:11:57,730 --> 01:11:59,170
Hii si yenyewe kazi.

1553
01:11:59,170 --> 01:12:02,540
Taarifa mimi si kuweka mabano
hapa katika njia ya kawaida.

1554
01:12:02,540 --> 01:12:06,800
Mimi nina literally kupita kazi kuitwa
handler () kwa kazi nyingine

1555
01:12:06,800 --> 01:12:10,800
aitwaye kuwasilisha () kama hoja kama
ingawa ni kama kutofautiana.

1556
01:12:10,800 --> 01:12:14,290
Na hii ni moja ya sifa za
JavaScript, ni kazi wenyewe

1557
01:12:14,290 --> 01:12:15,710
ni kweli tu vitu.

1558
01:12:15,710 --> 01:12:18,350
Kwa hakika, ni kweli tu
vigezo ya aina fulani.

1559
01:12:18,350 --> 01:12:21,340
Na kama jina la kazi ni
handler (), hakuna sababu siwezi

1560
01:12:21,340 --> 01:12:23,390
kupita katika kama hoja hapa.

1561
01:12:23,390 --> 01:12:27,530
Na hii ina maana wakati aina
na ID ya demo ni

1562
01:12:27,530 --> 01:12:29,320
in, piga kazi hii.

1563
01:12:29,320 --> 01:12:32,770
>> Lakini sasa kama mimi kuondoa haya yote,
kwa nini basi mimi labda kufanya

1564
01:12:32,770 --> 01:12:34,850
huu wa sasa iliyopita?

1565
01:12:34,850 --> 01:12:36,840
Naam, hii ni kazi bila majina.

1566
01:12:36,840 --> 01:12:41,080
Kwa sababu kusema ukweli, mimi barabara kwa nini mimi
bothering kupoteza muda kutangaza

1567
01:12:41,080 --> 01:12:45,540
kazi kuitwa handler () tu kuwaita
katika moja na sehemu moja tu?

1568
01:12:45,540 --> 01:12:48,640
Kama mimi si haja jina, na mimi si
haja ya simu ni mahali zaidi ya moja,

1569
01:12:48,640 --> 01:12:51,200
hebu tu kutekeleza kazi
haki ambapo mimi haja yake.

1570
01:12:51,200 --> 01:12:55,190
Na hivyo JavaScript na PHP msaada gani
walioitwa kazi bila majina kwamba

1571
01:12:55,190 --> 01:12:57,900
naomba kufanya hasa kwamba hapa.

1572
01:12:57,900 --> 01:12:59,570
>> Lakini sisi ni scratching tu ya uso.

1573
01:12:59,570 --> 01:13:02,430
Hebu tease na michache tu
mifano ya mwisho hapa.

1574
01:13:02,430 --> 01:13:04,600
>> Kama mimi kwenda katika quote.php.

1575
01:13:04,600 --> 01:13:07,160

1576
01:13:07,160 --> 01:13:11,870
Taarifa kwamba hii ni kweli PHP
kazi, mpango PHP, kwamba mimi aliandika

1577
01:13:11,870 --> 01:13:15,270
kwamba anatarajia parameter HTTP aitwaye
ishara, na siwezi kupita katika

1578
01:13:15,270 --> 01:13:16,730
thamani kama FB.

1579
01:13:16,730 --> 01:13:20,010
Na kama sisi kweli kuangalia chanzo
code, hii ni querying tovuti ya bure

1580
01:13:20,010 --> 01:13:23,680
aitwaye Yahoo Fedha, kama p-kuweka
saba, na ni kurudi kwangu

1581
01:13:23,680 --> 01:13:26,580
kitu katika inaonekana
format inajulikana ni JSON -

1582
01:13:26,580 --> 01:13:28,010
JavaScript Object nukuu.

1583
01:13:28,010 --> 01:13:28,810
Ni tu kitu.

1584
01:13:28,810 --> 01:13:32,500
Taarifa braces curly, quotes,
koloni, na koma.

1585
01:13:32,500 --> 01:13:34,720
>> Sasa wakati huo huo, hii ni pretty cool.

1586
01:13:34,720 --> 01:13:38,520
Kwa sababu mimi pengine unaweza kutumia programu
lugha ya kuzalisha URLs

1587
01:13:38,520 --> 01:13:40,370
kwamba kuangalia kama hii dynamically,
sawa?

1588
01:13:40,370 --> 01:13:43,340
Mimi naweza kubadili hii Google
na kupata nyuma ya Google

1589
01:13:43,340 --> 01:13:47,930
bei ya hisa ya $ 1,017.55.

1590
01:13:47,930 --> 01:13:49,640
Basi hebu angalia kama tunaweza kutumia hii sasa.

1591
01:13:49,640 --> 01:13:56,590
>> Hebu kwenda ajax-0 hapa, ambayo
inaonekana kama zifuatazo.

1592
01:13:56,590 --> 01:13:59,750
Ni tu tovuti hiyo ina
fomu na kifungo.

1593
01:13:59,750 --> 01:14:05,860
Hebu hapa kwenda mbele na aina katika YHOO
kwa hisa alama Yahoo, bonyeza Kupata

1594
01:14:05,860 --> 01:14:10,530
Quote, na sasa taarifa mimi wameweza kujipatia
macho na 32.86.

1595
01:14:10,530 --> 01:14:14,050
>> Hebu kweli kwenda kwenye toleo fancier
ya ukurasa huu, toleo mbili, na

1596
01:14:14,050 --> 01:14:17,530
aina katika hebu sema Microsoft, MSFT.

1597
01:14:17,530 --> 01:14:18,410
Kupata Quote.

1598
01:14:18,410 --> 01:14:19,850
Na sasa taarifa, hakuna tahadhari.

1599
01:14:19,850 --> 01:14:22,770
Taarifa ambapo anasema bei
kuangaliwa?

1600
01:14:22,770 --> 01:14:27,060
Kuna rahisi ya mifano
mwanga katika kile Gchat, na kuungana

1601
01:14:27,060 --> 01:14:30,070
Kuzungumza, na Gmail, na mengine kama
Nje ni kufanya kwa kweli

1602
01:14:30,070 --> 01:14:31,290
kubadilisha ukurasa wa mtandao.

1603
01:14:31,290 --> 01:14:31,800
>> Taarifa hii.

1604
01:14:31,800 --> 01:14:33,120
Hebu upya ukurasa.

1605
01:14:33,120 --> 01:14:35,080
Hebu kufungua Chrome ya Inspekta.

1606
01:14:35,080 --> 01:14:36,890
Hebu kwenda na mambo
tab hapa chini.

1607
01:14:36,890 --> 01:14:42,310
Sasa taarifa kama mimi kuvuta chini hapa na
kufungua hili, taarifa kwamba hii ni yangu

1608
01:14:42,310 --> 01:14:44,500
HTML DOM - hati yangu kitu mfano wa kuigwa.

1609
01:14:44,500 --> 01:14:45,920
Hii ni HTML yangu.

1610
01:14:45,920 --> 01:14:48,750
Lakini sasa taarifa, hata kama ni kinaendelea
kuwa ngumu kidogo kuona katika wawili

1611
01:14:48,750 --> 01:14:52,080
maeneo kwa mara moja, kama mimi aina katika FB
hapa, kuangalia chini

1612
01:14:52,080 --> 01:14:54,110
ya screen tu.

1613
01:14:54,110 --> 01:14:57,720
>> Ni kweli kubadilisha
HTML yangu juu ya kuruka.

1614
01:14:57,720 --> 01:15:01,670
Na ni kufanya hii kabisa tu
kwa kufanya kitu kama hiki.

1615
01:15:01,670 --> 01:15:06,800
Kama mimi kufungua ajax-2, taarifa ya utekelezaji wa
kitu kama sexy kama

1616
01:15:06,800 --> 01:15:09,560
kwamba, hata kama ni pretty mbaya,
lakini kama kisasa kama kwamba

1617
01:15:09,560 --> 01:15:11,910
functionally, ina baadhi ya
HTML chini.

1618
01:15:11,910 --> 01:15:13,810
Lakini taarifa Nilikuwa tag.

1619
01:15:13,810 --> 01:15:16,640
Tumekuwa si alitumia kabla, lakini hii ni
kama, lakini haina nguvu

1620
01:15:16,640 --> 01:15:17,840
kila kitu kwenye mstari mpya.

1621
01:15:17,840 --> 01:15:20,830
Ni tu hufanya mkoa wa mstatili
juu ya mstari huo kimsingi.

1622
01:15:20,830 --> 01:15:22,870
>> Taarifa kwamba mimi akampa ID ya bei.

1623
01:15:22,870 --> 01:15:26,800
Na zinageuka na kutumia huo
JavaScript maktaba, nina kazi

1624
01:15:26,800 --> 01:15:30,440
aitwaye quote () kwamba wito wakati wowote
fomu ni kuwasilishwa.

1625
01:15:30,440 --> 01:15:31,800
Na nini mimi kufanya ni hii.

1626
01:15:31,800 --> 01:15:35,730
Mimi kutangaza variable katika JavaScript
aitwaye url, kuokoa thamani

1627
01:15:35,730 --> 01:15:38,650
quote.php? ishara =.

1628
01:15:38,650 --> 01:15:44,220
Kwa maneno mengine, mimi mwenyewe ni mwanzo
kuandaa ombi HTTP, na kisha

1629
01:15:44,220 --> 01:15:49,250
Mimi nina concatenating kwenye kwamba pamoja na pamoja na
chochote hiki na ID

1630
01:15:49,250 --> 01:15:54,190
ya alama ni, ambayo taarifa ni kwamba
Nakala shamba haki ya chini hapa.

1631
01:15:54,190 --> 01:15:56,630
Hivyo tu kama sisi na aina katika siku za nyuma.

1632
01:15:56,630 --> 01:16:01,450
>> Na kisha ni zamu nje katika jQuery, kama wewe
simu. val (), kwamba wito wa val

1633
01:16:01,450 --> 01:16:05,900
kazi, thamani ya kazi, kwamba anapata
chochote mtumiaji typed in

1634
01:16:05,900 --> 01:16:08,920
Na kisha wote wa trafiki mtandao
kinachotokea ni hii.

1635
01:16:08,920 --> 01:16:11,230
$. GetJSON.

1636
01:16:11,230 --> 01:16:13,720
>> Na kama kando, ishara ya dola ni
tu shorthand nukuu.

1637
01:16:13,720 --> 01:16:16,860
Ni kweli jQuery.getJSON.

1638
01:16:16,860 --> 01:16:21,520
Kupata mimi JSON kutoka URL huu, na wakati
ombi anakuja nyuma, wito huu

1639
01:16:21,520 --> 01:16:26,550
kazi na kupita katika kama hoja
chochote akarudi kutoka server.

1640
01:16:26,550 --> 01:16:31,205
>> Hivyo kwa maneno mengine, kama mimi kurejea
browser, na mimi kurejea quote.php,

1641
01:16:31,205 --> 01:16:35,590
nini browser yangu ni kufanya ni kupata
chunk hii ya data.

1642
01:16:35,590 --> 01:16:38,930
Na wakati mimi kwenda tovuti hii hapa,
taarifa kama sisi badala ya kwenda mtandao

1643
01:16:38,930 --> 01:16:43,820
tab na wazi, na kisha aina katika
kitu kama GOOG kwa Google na Kupata

1644
01:16:43,820 --> 01:16:46,340
Quote, taarifa ukurasa hakuna mabadiliko.

1645
01:16:46,340 --> 01:16:50,990
Lakini ombi HTTP ulifanywa, na kile
akarudi hapa kama sisi kuangalia

1646
01:16:50,990 --> 01:16:56,130
jibu ni rundo zima la JSON
kwamba sisi kupatikana hatimaye kwa

1647
01:16:56,130 --> 01:16:58,070
line hii rahisi hapa.

1648
01:16:58,070 --> 01:17:00,150
>> Takwimu ni kile kujipatia
kutoka kwa seva.

1649
01:17:00,150 --> 01:17:02,120
Bei ni jina la
muhimu mimi huduma ya juu.

1650
01:17:02,120 --> 01:17:05,230
Hivyo data.price anitiaye hiyo.

1651
01:17:05,230 --> 01:17:07,540
>> Sasa wakati huo huo, na hii
ni mfano wa mwisho.

1652
01:17:07,540 --> 01:17:09,280
Unaweza kufanya lakini zaidi kwa ukurasa.

1653
01:17:09,280 --> 01:17:12,440
Moja kwa kweli, vizuri mbili.

1654
01:17:12,440 --> 01:17:14,780
Tunaweza kuleta nyuma
tag, kama unakumbuka hii.

1655
01:17:14,780 --> 01:17:15,850
Hiyo ni JavaScript.

1656
01:17:15,850 --> 01:17:17,110
Tunaweza kufanya hivyo.

1657
01:17:17,110 --> 01:17:17,690
Kusisimua sana.

1658
01:17:17,690 --> 01:17:18,800
Sisi itabidi kuondoka kwamba kama cliffhanger.

1659
01:17:18,800 --> 01:17:21,590
>> Lakini zaidi excitingly, unaweza
kufanya mambo kama hayo.

1660
01:17:21,590 --> 01:17:25,940
Kama mimi kwenda kwa geolocation-1, ni zamu nje
kwamba Chrome anajua kwamba sisi ni katika

1661
01:17:25,940 --> 01:17:30,672
latitude longitude 42.37 -71.10..

1662
01:17:30,672 --> 01:17:32,940
Hivyo kuna hata zaidi huko
ovyo wako.

1663
01:17:32,940 --> 01:17:34,290
Lakini zaidi juu ya kwamba wiki ijayo.

1664
01:17:34,290 --> 01:17:35,540
Angalia wewe Jumatatu.

1665
01:17:35,540 --> 01:17:37,558