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>> [Music kucheza]

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>> DOUG LLOYD: Kwa hiyo kwa sasa sisi ni umri
faida katika programu ya mtandao, sawa?

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00:00:08,690 --> 00:00:12,140
Na tumekuwa kufunikwa kadhaa
Lugha katika video ya mtu binafsi.

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00:00:12,140 --> 00:00:14,690
Na sasa hebu kufanya moja zaidi, na javascript.

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00:00:14,690 --> 00:00:17,370
>> Kwanza habari njema, na javascript
ni programu ya kisasa

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00:00:17,370 --> 00:00:21,410
Lugha kiasi kama PHP ambao
syntax inatokana na C,

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00:00:21,410 --> 00:00:22,830
hivyo hiyo ni nafasi nzuri kuanza.

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Ni kuhusu mzee kama PHP, kama vile,
baada ya kuzunguka juu ya miaka 20.

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00:00:25,880 --> 00:00:28,600
Ilizuliwa karibu
huo huo kama PHP.

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00:00:28,600 --> 00:00:32,240
Na JavaScript ni kweli pretty
msingi kwa uzoefu user

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00:00:32,240 --> 00:00:32,740
ya mtandao.

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Kwa kweli, kuna
lugha tatu kwamba mimi

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00:00:34,448 --> 00:00:38,480
kusema aina ya kufanya juu ya
uzoefu user ya mazungumzo

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00:00:38,480 --> 00:00:42,650
na tovuti, html,
css, na JavaScript.

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Na hivyo sasa hebu majadiliano
kidogo kuhusu JavaScript.

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>> Habari mbaya, ingawa, na JavaScript ni
kwamba unaweka mengi ya sheria kwa ajili ya yenyewe,

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na kisha inavunja yao.

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00:00:51,300 --> 00:00:54,010
Na JavaScript kweli anaweza
aina ya changamoto ya kujifunza,

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kwa sababu ni tofauti na C na
PHP, ambayo ni muundo sana

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na kuwa na sheria kali sana
kwa jinsi mambo wanaweza kufanya kazi.

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JavaScript ina aina
ya kujipatia hivyo rahisi

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kwamba labda mambo si kwenda
kazi kwa njia tunatarajia yao kwa,

24
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na labda sisi kweli hawezi kujifunza
kwanza lugha yetu programu

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00:01:09,830 --> 00:01:10,769
kama JavaScript.

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Hivyo labda kwa sababu hana
imejiwekea sheria yoyote,

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na ni kweli haina
kutekeleza tabia nzuri coding.

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Lakini sasa tumekuwa hopefully maendeleo
baadhi nzuri coding tabia,

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na ili tuweze kuanza kwa kuliingia
ndani ya JavaScript kidogo.

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>> Kuandika JavaScript, sawa na ufunguzi
up C file na nukta C ugani

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au PHP faili na nukta PHP ugani,
wote tunahitaji kufanya ni kufungua faili

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kwa nukta JS faili ugani.

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Hatuna haja ya kuwa na yoyote maalum
delimiters kama tulivyofanya katika PHP.

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Kwamba aina ya pembe
mabano alama swali PHP

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kwamba sisi ni kutumika na kwamba, njia
sisi tunasema kisakuzi yetu kwamba tuna nini ni

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JavaScript ni kwa pamoja
hivyo katika html tag,

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na tutaweza kuona kidogo kuhusu
jinsi ya kufanya hivyo katika muda tu.

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>> Jambo jingine kwamba inafanya
JavaScript tofauti,

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ingawa, ni kwamba anaendesha upande wa mteja.

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Hivyo kukumbuka na PHP kwamba
sisi kamwe kweli kuona

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PHP kwamba mkazo tovuti.

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Kama sisi milele kutazamwa
ukurasa chanzo, tunataka tu

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ona html kwamba alikuwa
yanayotokana na kwamba PHP.

44
00:02:02,830 --> 00:02:04,900
Lakini JavaScript anaendesha upande wa mteja.

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00:02:04,900 --> 00:02:06,710
Wako JavaScript anaendesha kwenye kompyuta yako.

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Na hii ndiyo maana unaweza kufanya
mambo kama kuongeza blockers.

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Sawa?

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00:02:09,550 --> 00:02:12,704
Tangazo kuzuia ni kawaida kufanyika kwa
kuua wote wa JavaScript

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00:02:12,704 --> 00:02:14,370
kwamba ni mbio kwenye tovuti fulani.

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Na kwa sababu ingekuwa kwa
kukimbia upande wa mashine mteja wako,

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unaweza tu kuacha
JavaScript kwa ajili ya kuendesha kabisa.

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Hiyo ina maana kwamba wakati matumizi
tovuti ya kwamba ni pamoja na JavaScript,

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una kutuma JavaScript chanzo
kificho ikiwa ni sehemu ya http majibu yako

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kwa mteja wakati wao ombi hilo.

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Na hivyo waweza si
wanataka kutumia JavaScript

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kufanya mambo kweli nyeti
kama kupita maelezo

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kuhusu nywila za watumiaji 'nyuma na
nje, kwa sababu wao ni kweli

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kwenda kupokea yote ya chanzo kanuni,
si tu html kwamba ni kuzalisha,

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kama vile itakuwa kesi na kusema PHP.

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>> Hivyo ni jinsi gani sisi ni pamoja na JavaScript
katika html yetu kuanza na?

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Naam, sawa na CSS, kwa kweli,
ni aina ya jinsi ya kufanya hivyo hapa.

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Na CSS tuna vitambulisho style.

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Na ndani ya vitambulisho wale style,
tunaweza kufafanua karatasi CSS style.

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Vile vile na JavaScript
Tunaweza kufungua vitambulisho script,

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tag mwingine html hatukuwa
majadiliano juu katika html yetu video,

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na kuandika JavaScript katika
kati ya vitambulisho wale script.

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Pia ingawa, kama CSS, sisi
inaweza kuhusisha katika nje mafaili CSS

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na kuvuta yao katika mpango wetu kwa njia hiyo.

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Na CSS tunaweza pia,
udhuru kwangu, na JavaScript

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sisi pia unaweza kutaja chanzo
sifa ya tag script

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kuhusisha katika JavaScript
tofauti, hivyo huna

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na kuandika katika
kati ya vitambulisho script, sisi

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Unaweza kuhusisha katika kutumia
kwamba tag script pia.

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Na kama vile kwa kesi na CSS ambapo
sisi ilipendekeza kwamba ilikuwa pengine

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kwa maslahi yako bora kuandika
CSS yako katika faili tofauti katika kesi

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unahitaji mabadiliko hayo,
vile vile kufanya sisi kupendekeza

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kwamba kuandika yako
JavaScript katika files tofauti

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na kutumia vitambulisho Muswada chanzo
wanampa kufunga wako JavaScript

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ndani ya html yako, mtandao ukurasa wako.

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>> Vigezo hivyo JavaScript, tutaweza
kuanza kuzungumza juu ya syntax hapa.

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Na tutaweza kwenda kupitia
aina hii ya haraka,

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kwa sababu tumefanya hii katika PHP, hivyo
hii lazima wote kuwa pretty ukoo.

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Hivyo vigezo katika JavaScript ni
sawa na PHP vigezo.

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Hakuna aina specifier, na
wakati kuanzisha kutofautiana,

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wewe kiambishi ni pamoja na var Keyword.

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Katika PHP tunataka kufanya kitu
kama hii, ishara ya dola x.

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Hiyo ni jinsi sisi zilionyesha
kutofautiana, lakini hakuna, sisi

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wala kutaja aina
ya kutofautiana wakati wote.

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Tunataka kusema kitu kama
dola ishara x sawa 44 katika PHP.

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Kama tunafanya
kitu kimoja katika JavaScript,

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tunataka kusema var x sawa 44.

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Hivyo var ni aina ya njia yetu
ya kuanzisha kutofautiana.

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Hiyo ni labda kidogo zaidi Intuitive
kuliko tu dola ishara kutofautiana.

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>> Tena, tangu hakuna
aina ya data, tunaweza kufanya hivyo

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na aina yoyote data, masharti,
kitu kingine chochote ingekuwa wote kuwa var.

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Conditionals, wote wa wetu
marafiki wa zamani kutoka C na PHP

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bado zinapatikana, hivyo tuna ikiwa,
mwingine kama, mwingine, kubadili na swali

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alama ya matumbo.

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Kubadili iliyobaki kama rahisi kama ni
Ilikuwa katika PHP, lakini yote haya uko

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ukoo na kwa sasa.

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Na vile vile kwa mizunguko ni
favorites zamani wa muda,

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kufanya wakati, na kwa bado inapatikana kwa sisi.

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Hivyo tayari tunajua mengi ya
msingi JavaScript aina ya misingi

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tu kwa mujibu wa kuwa na kidogo kabisa
ya maarifa sasa kuhusu C na PHP.

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>> Je kuhusu kazi katika JavaScript?

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00:05:03,670 --> 00:05:08,199
Naam, sawa na PHP kila kazi ni
ilianzisha na kazi Keyword.

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Unasema kazi, na kisha
kuanza kufafanua kazi yako.

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Nini tofauti kidogo
kuhusu JavaScript,

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ingawa ni uwezo wa kuwa na
kile kinachoitwa kazi bila majina.

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Hivyo unaweza kufafanua majukumu
kwamba hawana jina.

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Hili ni jambo sisi
kweli hawajaona kabla.

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Tutaweza kweli kutumia dhana
ya kazi bila majina

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Muda mfupi baadaye katika hii
video, kwa sababu itabidi

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mantiki zaidi kidogo katika mazingira
wakati sisi kuona katika hali fulani

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kwamba nimepata crafted hapa.

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Lakini hebu tu kuangalia
nini rahisi JavaScript

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kazi ili kuangalia kama.

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>> Hivyo nimekuwa wamekwenda mbele na
imefungua CS50 yangu IDE

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na nimekuwa tayari kukimbia Apache
kuanza server yangu mbio.

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Na nina faili hili
kufungua aitwaye Home.html.

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Na mimi itabidi kuvuta kidogo hapa.

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Na kimsingi, unaweza kuona
Home.html ni tu rundo la vifungo.

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Na mimi nina wakidai juu hapa
kwamba hii ni sehemu JavaScript

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vifaa.

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Hivyo kuna kundi la vifungo hapa,
lakini je, vifungo hizi kwa kweli kufanya?

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>> Vizuri, tutaweza kichwa juu ya IED yangu,
na mimi Home.html kufungua hapa.

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Mwanzoni kabisa,
hapa ndipo mimi nina kuunganisha

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katika yote ya yangu mafaili chanzo JavaScript.

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Sawa?

130
00:06:08,000 --> 00:06:12,440
Hivyo nina anonymous.js, clock.js,
Mimi nina kutumia chanzo sifa

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ya tag script kuhusisha katika faili.

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Hivyo Sikuwaandikia yoyote
JavaScript moja kwa moja kwenye faili hili,

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lakini nimekuwa kujiondoa katika yote
JavaScript nimekuwa imeandikwa tofauti.

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Na kama sisi kitabu chini hapa, hii
lazima wote kuangalia kiasi fulani ukoo

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kwa kidogo ya syntax mpya.

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Tunayo kichwa tag kwa
kazi na kisha kifungo.

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Nina pembejeo hiyo ni aina ya kifungo,
na inaonekana wakati mimi click yake,

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Mimi nina kwenda kuwaita baadhi
kazi tahadhari tarehe.

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Na hii ni jinsi gani tunaweza aina ya kuchanganya
kidogo ya JavaScript na html.

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Wao kweli kucheza pretty vizuri
pamoja, na hivyo inaonekana wakati

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Mimi bonyeza kifungo hii, mimi nina kwenda
kuwaita baadhi tarehe tahadhari kazi.

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Na vile vile kuwa na mimi inavyoelezwa tabia
kwa wote wa vifungo vingine ambavyo

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ni juu ya kwamba ukurasa home.html,
ambayo tutaweza kuweka kurudi

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kwa wakati wa kozi ya video hii.

145
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Lakini hebu kwenda nyuma hadi
hapa na kuangalia

146
00:07:00,880 --> 00:07:03,850
katika clock.js, ambayo ni
JavaScript faili kwamba mimi

147
00:07:03,850 --> 00:07:07,370
aliandika kwamba ina kazi hii kwanza
tunakwenda tuangalie.

148
00:07:07,370 --> 00:07:11,630
Kama unaweza kuona, mimi kuanza yangu JavaScript
kazi na keyword kazi,

149
00:07:11,630 --> 00:07:14,560
na Nimekupa hii a moja
jina, ni kuitwa tahadhari tarehe.

150
00:07:14,560 --> 00:07:18,710
Ndani ya huko, mimi inaonekana kujenga
kutofautiana mpya za kuitwa tarehe ya sasa.

151
00:07:18,710 --> 00:07:21,500
Na mimi nina kwenda kuwapa
sawa na tarehe mpya.

152
00:07:21,500 --> 00:07:24,430
Na tunaweza kupata katika mengi ya
undani kama yale tarehe ni,

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00:07:24,430 --> 00:07:27,060
na kwa kweli JavaScript ni hivyo
kubwa kwamba hatuwezi uwezekano

154
00:07:27,060 --> 00:07:28,330
kufunika kila kitu katika moja video.

155
00:07:28,330 --> 00:07:32,220
Lakini inatosha kusema, hii ni kwenda
kurudi kwangu bidhaa takwimu ambazo

156
00:07:32,220 --> 00:07:35,470
encapsulates tarehe ya sasa na wakati.

157
00:07:35,470 --> 00:07:39,100
Mimi kuhifadhi kwamba katika kutofautiana kwamba mimi nina
inaonekana kwenda kwa macho tarehe ya sasa.

158
00:07:39,100 --> 00:07:41,300
>> Naam, ni nini tahadhari
sasa tarehe kuangalia kama?

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00:07:41,300 --> 00:07:46,460
Hebu tuangalie faili yenyewe
kuunga zaidi katika dirisha browser.

160
00:07:46,460 --> 00:07:49,551
Hivyo tena, hii ni kifungo kwamba mimi
kuwa amefungwa na, hii kazi aitwaye.

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Na mimi click yake huko na
kuangalia nini alifanya, ni wamehamasika.

162
00:07:51,800 --> 00:07:56,140
Ni popped up aina hii ya sanduku kuwaambia
mimi kwamba wakati wa sasa ni, inaonekana

163
00:07:56,140 --> 00:07:59,370
ni Novemba 4 katika
10:43:43 asubuhi.

164
00:07:59,370 --> 00:08:02,345
Na kama mimi click yake tena, sasa
ni sekunde chache baadaye, sawa?

165
00:08:02,345 --> 00:08:03,720
Hivyo hiyo ni kazi haya yote gani.

166
00:08:03,720 --> 00:08:07,670
Wakati mimi bonyeza kifungo hii,
pops up ujumbe tahadhari kwangu.

167
00:08:07,670 --> 00:08:13,806

168
00:08:13,806 --> 00:08:15,690
Kwa hiyo, kuna kweli si
sana kwa kazi

169
00:08:15,690 --> 00:08:19,110
hiyo ni tofauti na PHP,
kidogo tu ya syntax mpya

170
00:08:19,110 --> 00:08:22,500
kuja na kufanya kazi na JavaScript.

171
00:08:22,500 --> 00:08:24,650
>> Arrays katika JavaScript ni
pretty moja kwa moja.

172
00:08:24,650 --> 00:08:27,200
Kutangaza safu, matumizi
mabano mraba syntax

173
00:08:27,200 --> 00:08:30,090
kwamba sisi ni ukoo na kutoka PHP.

174
00:08:30,090 --> 00:08:33,432
Na sawa na PHP, sisi
pia unaweza kuchanganya aina ya data.

175
00:08:33,432 --> 00:08:35,140
Hivyo safu hii, wote
ya arrays haya ingekuwa

176
00:08:35,140 --> 00:08:36,960
kuwa kikamilifu halali JavaScript.

177
00:08:36,960 --> 00:08:42,500
Moja kwamba ni integers wote, na moja ambayo
ni mchanganyiko up aina mbalimbali data.

178
00:08:42,500 --> 00:08:45,020
>> Nini kitu tofauti sana
katika JavaScript, ingawa?

179
00:08:45,020 --> 00:08:47,020
Hiyo ni dhana ya kitu.

180
00:08:47,020 --> 00:08:50,240
Hivyo labda wewe Nimesikia ya
kitu Programu oriented.

181
00:08:50,240 --> 00:08:53,370
Hatuwezi kufanya mengi ya hayo katika CS50,
lakini sisi kufanya kazi kidogo ya hiyo

182
00:08:53,370 --> 00:08:55,670
hapa katika mazingira ya JavaScript.

183
00:08:55,670 --> 00:08:59,100
Sasa JavaScript ina uwezo wa
kuishi kama kitu oriented programu

184
00:08:59,100 --> 00:09:02,615
lugha, lakini si yenyewe
peke kitu oriented

185
00:09:02,615 --> 00:09:03,490
lugha ya programu.

186
00:09:03,490 --> 00:09:05,281
Na hii tena inakuja
nyuma kwa nini nilivyosema, ni

187
00:09:05,281 --> 00:09:10,610
inaweza kuwa changamoto sana kujifunza
JavaScript kama kompyuta yako kwanza

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00:09:10,610 --> 00:09:13,890
lugha, kwa sababu hana
kweli fit dhana fulani.

189
00:09:13,890 --> 00:09:16,430
>> C Kwa upande mwingine ni
kazi lugha ya programu.

190
00:09:16,430 --> 00:09:22,270
Kama tunataka, kazi ni
aina ya bosi kubwa mtu, sawa?

191
00:09:22,270 --> 00:09:24,410
Wao kulazimisha kile
hutokea kila kitu kingine.

192
00:09:24,410 --> 00:09:26,600
Tunataka mabadiliko vigezo,
tunatoa wito kazi.

193
00:09:26,600 --> 00:09:28,220
Sisi kufanya mambo kwa kazi.

194
00:09:28,220 --> 00:09:31,250
Vitu badala yake, katika
kitu oriented lugha,

195
00:09:31,250 --> 00:09:35,937
vitu aina ya kuwa nyota na
kazi kuwa aina ya sekondari.

196
00:09:35,937 --> 00:09:38,270
Lakini ni nini kitu gani
ni wazo hili la kitu?

197
00:09:38,270 --> 00:09:40,880
Naam, kama inasaidia, fikiria
kuhusu hilo wakati aina ya kwanza

198
00:09:40,880 --> 00:09:44,540
ya kama C muundo au struct
kuwa tumejifunza kuhusu kabla.

199
00:09:44,540 --> 00:09:47,430
Katika C, muundo inajumuisha
idadi ya mashamba,

200
00:09:47,430 --> 00:09:51,174
na labda sisi sasa inaweza kuanza
piga mashamba hayo mali.

201
00:09:51,174 --> 00:09:53,590
Lakini mali kamwe kweli
kusimama peke yao, sawa?

202
00:09:53,590 --> 00:09:56,410
Kama mimi kufafanua muundo kwa ajili ya gari
kama hii kwa kufuatia wawili

203
00:09:56,410 --> 00:10:00,750
mashamba au mali, an moja
integer kwa mwaka wa gari

204
00:10:00,750 --> 00:10:04,290
na mwingine 10 tabia
kamba kwa mfano wa gari,

205
00:10:04,290 --> 00:10:07,150
Naweza kusema kitu kama hiki,
Siwezi kutangaza kutofautiana mpya

206
00:10:07,150 --> 00:10:10,080
ya aina struct gari Herbie.

207
00:10:10,080 --> 00:10:13,730
Na kisha siwezi kusema kitu
kama herbie.year sawa na 1,963,

208
00:10:13,730 --> 00:10:15,850
na herbie.model sawa na mende.

209
00:10:15,850 --> 00:10:17,000
Hiyo ni sawa.

210
00:10:17,000 --> 00:10:19,680
Mimi nina kutumia mashamba katika
mazingira ya muundo,

211
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lakini mimi naweza kamwe tu
kusema kitu kama hiki.

212
00:10:22,290 --> 00:10:22,790
Sawa?

213
00:10:22,790 --> 00:10:26,836
Siwezi kutumia jina uwanja
huru ya muundo.

214
00:10:26,836 --> 00:10:28,210
Ni aina ya kitu kimsingi.

215
00:10:28,210 --> 00:10:32,990
>> Hivyo mashamba akiwa
msingi kwa miundo C

216
00:10:32,990 --> 00:10:39,050
ni sawa na mali kuwa
msingi kwa JavaScript vitu.

217
00:10:39,050 --> 00:10:42,080
Lakini nini inawafanya
hasa ya kuvutia

218
00:10:42,080 --> 00:10:46,230
ni kwamba vitu inaweza pia kuwa na kile
zinaitwa mbinu, ambayo ni kweli

219
00:10:46,230 --> 00:10:50,730
tu neno dhana kwa kazi ambayo
ni asili ya kitu kama vile.

220
00:10:50,730 --> 00:10:55,340
Hivyo ni kazi ambayo inaweza tu kuwa
kuitwa katika mazingira ya kitu.

221
00:10:55,340 --> 00:10:59,200
Tu kitu ambayo ina defined
kazi hii ndani ya yake,

222
00:10:59,200 --> 00:11:02,020
kama unadhani kuhusu
struct, kazi

223
00:11:02,020 --> 00:11:05,720
inaelezwa ndani ya wale kufafanua
braces curly ya muundo.

224
00:11:05,720 --> 00:11:07,980
Hivyo ina maana kitu tu
na muundo.

225
00:11:07,980 --> 00:11:10,960
Na hiyo ni aina ya nini sisi ni kufanya
hapa na vitu na mbinu.

226
00:11:10,960 --> 00:11:13,580
Ni kimsingi kama tuko
kufafanua kazi ambayo

227
00:11:13,580 --> 00:11:16,670
tu mantiki juu ya
kitu fulani, na hivyo sisi

228
00:11:16,670 --> 00:11:19,440
wito kwamba njia ya kitu.

229
00:11:19,440 --> 00:11:23,180
Na hatuwezi kuwaita kwamba
kazi ya kujitegemea ya kitu,

230
00:11:23,180 --> 00:11:29,260
kama hatuwezi kusema mwaka au mfano wa kuigwa
huru ya struct katika C.

231
00:11:29,260 --> 00:11:32,300
>> Programu hivyo kazi
dhana kuangalia kitu kama hii.

232
00:11:32,300 --> 00:11:35,450
Kazi na kisha wakati kupita
katika kitu kama parameter.

233
00:11:35,450 --> 00:11:38,650
Katika kitu oriented programu
lugha, hii aina ya anapata

234
00:11:38,650 --> 00:11:43,464
flipped, na tunataka kufikiria kuhusu
ni kama hii, object.function.

235
00:11:43,464 --> 00:11:45,380
Hivyo ni aina ya kwamba dot
operator tena ikimaanisha

236
00:11:45,380 --> 00:11:49,540
kuwa ni aina fulani ya mali
au sifa ya kitu yenyewe.

237
00:11:49,540 --> 00:11:53,240
Lakini hii ni nini kitu
oriented programu lugha

238
00:11:53,240 --> 00:11:57,150
inaweza kufanya ili kufanya kazi
wito kwa mbinu, tena, ambayo

239
00:11:57,150 --> 00:12:00,260
ni neno maalum kwa ajili ya kazi
kwamba ni asili ya kitu.

240
00:12:00,260 --> 00:12:03,440
Hii ni nini kwamba
syntax ili kuangalia kama.

241
00:12:03,440 --> 00:12:09,360
Na hivyo tutaweza kuanza kuona baadhi ya
huu katika mazingira ya JavaScript.

242
00:12:09,360 --> 00:12:12,470
>> Unaweza pia kufikiri juu ya kitu
aina ya kama safu associative,

243
00:12:12,470 --> 00:12:14,160
ambayo sisi ni ukoo na kutoka PHP.

244
00:12:14,160 --> 00:12:17,720
Kumbuka safu associative inaruhusu
yetu kuwa na thamani jozi ufunguo, badala

245
00:12:17,720 --> 00:12:23,040
ya kuwa na bahati 0, moja, mbili, tatu,
na kadhalika kama sisi ni kutumika kutoka C

246
00:12:23,040 --> 00:12:23,940
arrays.

247
00:12:23,940 --> 00:12:27,472
Associative arrays unaweza ramani
maneno, kama vile katika PHP video,

248
00:12:27,472 --> 00:12:29,180
sisi walikuwa wanazungumza juu
matamu ya pizzas.

249
00:12:29,180 --> 00:12:31,180
Na hivyo tulikuwa na safu
aitwaye pizzas, na sisi

250
00:12:31,180 --> 00:12:36,670
alikuwa jibini alikuwa ufunguo na $ 8.99 mara
thamani, na kisha pepperoni ilikuwa muhimu,

251
00:12:36,670 --> 00:12:39,190
$ 9.99 ilikuwa thamani, na kadhalika.

252
00:12:39,190 --> 00:12:43,300
Na hivyo tunaweza pia kufikiri juu ya
kitu aina ya sawa na associative

253
00:12:43,300 --> 00:12:43,840
safu.

254
00:12:43,840 --> 00:12:47,020
Na hivyo syntax hii hapa
ingekuwa kujenga kitu kipya

255
00:12:47,020 --> 00:12:50,950
aitwaye Herbie na mbili
mali ndani yake.

256
00:12:50,950 --> 00:12:57,310
Mwaka, ambayo ni kwa ajili thamani 1963,
na mfano, ambayo ni kwa ajili kamba

257
00:12:57,310 --> 00:12:58,140
Mende.

258
00:12:58,140 --> 00:13:01,770
>> Na taarifa hapa kwamba mimi nina kutumia
quotes moja katika JavaScript.

259
00:13:01,770 --> 00:13:05,570
Unaweza kutumia quotes moja au mbili
wakati wewe ni kuzungumza juu ya masharti.

260
00:13:05,570 --> 00:13:07,772
Ni tu conventionally
kesi hiyo mara nyingi

261
00:13:07,772 --> 00:13:10,230
wakati wewe ni kuandika JavaScript,
wewe tu kutumia quotes moja.

262
00:13:10,230 --> 00:13:15,050
Lakini mimi naweza kutumia quotes mbili hapa, na
kwamba itakuwa kikamilifu faini pia.

263
00:13:15,050 --> 00:13:17,470
>> Basi kumbuka jinsi katika
PHP tulikuwa wazo hili

264
00:13:17,470 --> 00:13:22,730
ya kwa kila kitanzi ambayo ingeweza kuruhusu sisi
iterate juu ya yote ya thamani muhimu

265
00:13:22,730 --> 00:13:25,270
jozi ya associative
safu, kwa sababu sisi

266
00:13:25,270 --> 00:13:29,050
hawakuwa na uwezo huo iterate
kupitia 0, moja, mbili, tatu, nne,

267
00:13:29,050 --> 00:13:30,710
na kadhalika?

268
00:13:30,710 --> 00:13:35,010
JavaScript ina kitu sawa sana,
lakini siyo kuitwa kwa ajili ya kila kitanzi,

269
00:13:35,010 --> 00:13:38,960
ni kuitwa kwa katika mizunguko.

270
00:13:38,960 --> 00:13:42,890
Hivyo kama mimi akaniambia kama
hii, kwa var muhimu katika kitu,

271
00:13:42,890 --> 00:13:48,670
hiyo ni aina ya sawa na kusema
kwa kila kitu kama kitu fulani.

272
00:13:48,670 --> 00:13:53,850
Lakini wote mimi nina kufanya hapa ni iterating
njia zote za funguo za kitu yangu.

273
00:13:53,850 --> 00:13:56,070
Na ndani ya curly
inakabiliwa na huko, napenda

274
00:13:56,070 --> 00:14:03,410
kutumia kitu mabano mraba muhimu kwa kutaja
kwa thamani wakati huo eneo muhimu.

275
00:14:03,410 --> 00:14:05,400
>> Vinginevyo, kuna
hata mwingine mbinu.

276
00:14:05,400 --> 00:14:10,880
Kama mimi tu tu huduma ya juu
maadili, naweza kusema kwa ufunguo wa kitu,

277
00:14:10,880 --> 00:14:12,360
na tu kutumia ufunguo ndani.

278
00:14:12,360 --> 00:14:17,240
Hivyo kwa var muhimu katika kitu, nina
kutumia kitu mabano mraba

279
00:14:17,240 --> 00:14:19,340
ufunguo ndani ya kitanzi.

280
00:14:19,340 --> 00:14:24,580
Kwa var ufunguo wa kitu, siwezi
tu kutumia ufunguo ndani ya kitanzi,

281
00:14:24,580 --> 00:14:29,040
kwa sababu mimi nina tu mahsusi
kuzungumza juu ya maadili huko.

282
00:14:29,040 --> 00:14:32,630
>> Basi hebu labda kuchukua
tuangalie tofauti

283
00:14:32,630 --> 00:14:35,670
tu kwa haraka kuonyesha
Tofauti kati ya nne

284
00:14:35,670 --> 00:14:40,730
katika na kwa wa na maalum sana
safu, ambayo sisi hapa, wiki safu.

285
00:14:40,730 --> 00:14:43,616
Hivyo nina kupata safu mpya
kwamba mimi kujazwa na masharti saba,

286
00:14:43,616 --> 00:14:46,240
Jumatatu, Jumanne, Jumatano,
Alhamisi, Ijumaa, Jumamosi, Jumapili.

287
00:14:46,240 --> 00:14:50,530
Na mimi nataka sasa iterate
kupitia safu hii,

288
00:14:50,530 --> 00:14:53,090
uchapishaji nje habari fulani.

289
00:14:53,090 --> 00:14:58,780
Kama mimi kutumia kwa kitanzi katika
magazeti nje ya habari,

290
00:14:58,780 --> 00:15:00,710
unafikiri nini mimi nina kwenda kupata?

291
00:15:00,710 --> 00:15:01,710
Naam, hebu tuangalie.

292
00:15:01,710 --> 00:15:05,300
Na kabla ya sisi kuruka juu
kwa browser window wangu,

293
00:15:05,300 --> 00:15:08,090
tu kujua kwamba
console.log ni aina ya mtu

294
00:15:08,090 --> 00:15:10,630
njia ya kufanya magazeti F katika JavaScript.

295
00:15:10,630 --> 00:15:12,040
Lakini ni nini console?

296
00:15:12,040 --> 00:15:14,940
Naam, hiyo ni nini tunakwenda
kwenda kuangalia hivi sasa.

297
00:15:14,940 --> 00:15:16,850
>> OK, hivyo tuko nyuma hapa
katika browser window wangu,

298
00:15:16,850 --> 00:15:19,410
na mimi nina kwenda kufungua
up developer yangu zana.

299
00:15:19,410 --> 00:15:22,290
Tena, mimi kupiga F12 tu
kufungua zana developer.

300
00:15:22,290 --> 00:15:25,670
Na taarifa kwamba hapa katika
juu nimekuwa waliochaguliwa console.

301
00:15:25,670 --> 00:15:28,480
Hivyo hii ni dhana
ya developer console,

302
00:15:28,480 --> 00:15:30,500
na itakuwa kuruhusu sisi
magazeti ya kampuni nje,

303
00:15:30,500 --> 00:15:33,000
aina ya kama wastaafu, lakini
kama utaona baadaye kidogo,

304
00:15:33,000 --> 00:15:37,720
sisi pia unaweza aina katika maelezo
kuingiliana na mtandao wetu ukurasa.

305
00:15:37,720 --> 00:15:42,320
Mimi nina kwenda kuvuta kidogo hapa,
na mimi nina gonna sasa click kwenye maana katika mtihani.

306
00:15:42,320 --> 00:15:45,230
Na nne katika test-- mimi nina gonna
kuonyesha kificho kwa sasa hivi,

307
00:15:45,230 --> 00:15:47,479
lakini utasikia kupata kama wewe
download chanzo kanuni kwamba

308
00:15:47,479 --> 00:15:50,380
ni kuhusishwa na video-- hii
ni tu kwamba kwa kitanzi katika

309
00:15:50,380 --> 00:15:52,610
kuwa tuliona tu
pili iliyopita juu ya slide.

310
00:15:52,610 --> 00:15:54,810
>> Hivyo mimi nina gonna click kwamba
kifungo, na zaidi ya hapa,

311
00:15:54,810 --> 00:15:58,440
hapa ni nini ina kuchapishwa katika
console, 0, moja, mbili, tatu, nne, tano,

312
00:15:58,440 --> 00:15:58,940
sita.

313
00:15:58,940 --> 00:16:02,490
Sikuwa magazeti nje maelezo
ndani ya maeneo hayo safu,

314
00:16:02,490 --> 00:16:05,180
kwa sababu mimi kutumika kwa katika kitanzi.

315
00:16:05,180 --> 00:16:10,670
Na ndani ya mwili wa kitanzi, mimi
tu kuchapishwa muhimu si kitu muhimu.

316
00:16:10,670 --> 00:16:18,600
Lakini kama mimi sasa wazi console wangu, nami
kubadili kwa mtihani, na nne ya mtihani

317
00:16:18,600 --> 00:16:22,500
Nasema mimi kutumia kwa kitanzi cha
badala na magazeti nje muhimu,

318
00:16:22,500 --> 00:16:28,079
kama mimi bonyeza kwamba, sasa mimi nina kupata
mambo halisi ndani ya kitu yangu

319
00:16:28,079 --> 00:16:29,120
au safu yangu katika kesi hii.

320
00:16:29,120 --> 00:16:31,760
Safu yangu ya siku wiki.

321
00:16:31,760 --> 00:16:33,480
Mimi kuchapishwa Jumatatu,
Jumanne, Jumatano.

322
00:16:33,480 --> 00:16:36,930
Hivyo hiyo ni tofauti kati
a kwa katika kitanzi, ambayo Prints nje

323
00:16:36,930 --> 00:16:43,410
tu funguo kama wewe tu kutumia ufunguo
ndani ya mwili wa kitanzi,

324
00:16:43,410 --> 00:16:46,850
na kwa ya kitanzi, ambayo prints
nje maadili kama wewe tu kutumia

325
00:16:46,850 --> 00:16:48,870
ufunguo ndani ya mwili wa kitanzi.

326
00:16:48,870 --> 00:16:52,380
>> Haki wote, ni jinsi gani sisi sasa kuanza
concatenate masharti na labda kuchanganya

327
00:16:52,380 --> 00:16:57,220
baadhi ya vigezo na kitabu
kama tulikuwa na uwezo wa kufanya katika PHP?

328
00:16:57,220 --> 00:16:59,410
Naam, sisi ni pretty ukoo
na hii kutoka PHP.

329
00:16:59,410 --> 00:17:04,109
Hii ni jinsi gani tunataka kufanya hivyo kwa kutumia
dot operator kwa concatenate masharti.

330
00:17:04,109 --> 00:17:06,260
Katika JavaScript, ingawa,
sisi kweli kutumia kitu

331
00:17:06,260 --> 00:17:09,290
aitwaye pamoja na alama, ambayo
ni labda hata kidogo zaidi

332
00:17:09,290 --> 00:17:10,470
Intuitive, haki?

333
00:17:10,470 --> 00:17:12,609
Sisi ni kuongeza rundo
ya masharti pamoja.

334
00:17:12,609 --> 00:17:14,520
Basi hebu kichwa nyuma
zaidi na kuona nini huu

335
00:17:14,520 --> 00:17:18,693
magazeti kama sisi ni kujaribu magazeti nje
wote wa habari katika wiki safu.

336
00:17:18,693 --> 00:17:20,859
Haki wote, hivyo chini ya hapa
chini ya kamba concatenation,

337
00:17:20,859 --> 00:17:24,822
Nina chaguzi mbili, kamba jengo
V1 na kisha kamba jengo V2.

338
00:17:24,822 --> 00:17:26,530
Na tutaweza kuona nini sisi
haja V2 katika pili.

339
00:17:26,530 --> 00:17:28,610
Lakini mimi nina gonna click kwenye
kamba jengo V1, ambayo

340
00:17:28,610 --> 00:17:30,360
ni kanuni tulikuwa
tu kuchukua kuangalia,

341
00:17:30,360 --> 00:17:32,980
console.log na wote wa pluses.

342
00:17:32,980 --> 00:17:35,910
Hebu angalia kama hii prints
nini tunatarajia.

343
00:17:35,910 --> 00:17:39,939
>> Jumatatu ni siku idadi 01 ya juma,
Jumanne ni siku namba 11 ya wiki.

344
00:17:39,939 --> 00:17:41,730
Naam, ni nini mimi alikuwa anajaribu
kufanya kulikuwa na kupata

345
00:17:41,730 --> 00:17:46,280
ni magazeti nje Jumatatu ni siku idadi
moja, Jumanne ni siku namba mbili.

346
00:17:46,280 --> 00:17:50,140
Lakini inaonekana kama mimi nina
Daima uchapishaji nje moja.

347
00:17:50,140 --> 00:17:51,260
Naam, kwa nini ni kwamba?

348
00:17:51,260 --> 00:17:55,600
Naam, ni zamu nje, tuangalie tena
katika snippet hii ndogo ya kificho hapa.

349
00:17:55,600 --> 00:18:00,160
Taarifa kwamba sisi ni kutumia pamoja
operator katika mazingira mawili tofauti.

350
00:18:00,160 --> 00:18:03,221
>> Na hivyo hapa ni wapi labda mambo
kwamba tumekuwa aina ya wamekuwa wakisema,

351
00:18:03,221 --> 00:18:03,970
loo, ni kubwa sana.

352
00:18:03,970 --> 00:18:05,910
Hatuna kukabiliana na aina ya data tena.

353
00:18:05,910 --> 00:18:08,220
Lakini hapa ni ukweli ambapo
kwamba tunapoteza aina ya data

354
00:18:08,220 --> 00:18:10,960
kweli anaweza kuwa kidogo
nyingine ya matatizo kwetu.

355
00:18:10,960 --> 00:18:16,260
Sasa kwa kuwa pamoja na alama hutumika
concatenate masharti na kuongeza idadi

356
00:18:16,260 --> 00:18:19,550
pamoja, na javascript ina
kwa kufanya nadhani bora

357
00:18:19,550 --> 00:18:22,030
kama kwa nini nataka ni kufanya kwa ajili yangu.

358
00:18:22,030 --> 00:18:23,900
Na katika kesi hii, ni guessed vibaya.

359
00:18:23,900 --> 00:18:29,340
Ni tu concatenated siku, ambayo itakuwa ni
0, moja, mbili, tatu, nne, tano, sita au,

360
00:18:29,340 --> 00:18:32,060
na kisha tu concatenated
kuwa na kisha concatenated moja.

361
00:18:32,060 --> 00:18:35,020
Haikuwa kweli kuongeza yao pamoja.

362
00:18:35,020 --> 00:18:37,320
Na hivyo lugha hizi,
PHP na JavaScript,

363
00:18:37,320 --> 00:18:39,196
kuwa abstracts mbali
wazo hili la aina,

364
00:18:39,196 --> 00:18:40,820
huna kukabiliana nayo tena.

365
00:18:40,820 --> 00:18:43,600
Hawana bado wana aina chini ya kofia.

366
00:18:43,600 --> 00:18:46,780
Na tunaweza, katika hali
kama hii, kujiinua ukweli kwamba

367
00:18:46,780 --> 00:18:49,240
kwa kusema kitu
kama labda hii, ambayo

368
00:18:49,240 --> 00:18:53,210
ni kuwaambia JavaScript, na
njia, kutibu hii kama integer,

369
00:18:53,210 --> 00:18:57,100
hawana kutibu kama kamba, hata
ingawa sisi ni kuchanganya pamoja masharti

370
00:18:57,100 --> 00:18:58,940
na integers hapa.

371
00:18:58,940 --> 00:19:02,204
>> Ni tu moja ya mambo
kwamba inaonekana ni kubwa sana katika mazingira

372
00:19:02,204 --> 00:19:04,120
kwamba hatuna kwa
kukabiliana na aina tena,

373
00:19:04,120 --> 00:19:05,828
lakini wakati mwingine utasikia
kukimbia katika hali

374
00:19:05,828 --> 00:19:09,110
hasa kama hii ambapo ukweli kwamba
huna mamlaka juu ya aina

375
00:19:09,110 --> 00:19:11,220
unaweza kukwama juu ya wewe
kama wewe si makini.

376
00:19:11,220 --> 00:19:18,285
Na hivyo kama sisi pop nyuma zaidi kwa IDE, mimi nina
kwenda wazi nje console yangu tena,

377
00:19:18,285 --> 00:19:20,660
na mimi nina kwenda click kamba
jengo toleo la mawili, ambayo

378
00:19:20,660 --> 00:19:23,052
Hapa ndipo mimi kutumia kwamba parse int kazi.

379
00:19:23,052 --> 00:19:25,260
Sasa ni uchapishaji nje
habari kwamba mimi nina kutarajia.

380
00:19:25,260 --> 00:19:29,330
Jumatatu siku namba moja, Jumanne
ni siku namba mbili, na kadhalika.

381
00:19:29,330 --> 00:19:31,170
>> Basi hebu majadiliano juu ya kazi tena.

382
00:19:31,170 --> 00:19:34,790
Mimi aliahidi tunataka kuzungumza juu bila majina
kazi, na sasa mazingira kwa kuwa

383
00:19:34,790 --> 00:19:36,360
ina hatimaye aliwasili.

384
00:19:36,360 --> 00:19:39,980
Hivyo kabla ya sisi kufanya hivyo, hebu majadiliano tena
kuhusu arrays kwa ajili tu ya pili.

385
00:19:39,980 --> 00:19:42,120
Hivyo arrays ni maalum
kesi ya kitu.

386
00:19:42,120 --> 00:19:45,180
Kwa kweli, kila kitu katika
JavaScript ni kweli kitu.

387
00:19:45,180 --> 00:19:47,190
Hivyo kazi ni
kesi maalum ya kitu,

388
00:19:47,190 --> 00:19:49,770
integers ni maalum
kesi ya kitu,

389
00:19:49,770 --> 00:19:52,152
lakini arrays mahsusi
kuwa na idadi ya mbinu.

390
00:19:52,152 --> 00:19:55,110
Kumbuka kwa sababu wao ni vitu,
wanaweza kuwa na mali na mbinu.

391
00:19:55,110 --> 00:19:58,600
Wao kuwa na idadi ya mbinu kwamba
inaweza kutumika kwa vitu hivyo.

392
00:19:58,600 --> 00:20:01,197
Kuna njia inayoitwa
ukubwa, array.size,

393
00:20:01,197 --> 00:20:03,030
ambayo atarudi
wewe kama unaweza kutarajia

394
00:20:03,030 --> 00:20:05,120
idadi ya vipengele katika safu yako.

395
00:20:05,120 --> 00:20:08,480
array.pop, aina ya kama
dhana yetu ya yanajitokeza mbali

396
00:20:08,480 --> 00:20:11,110
ya stack, kama unakumbuka
kutoka mwingi yetu video,

397
00:20:11,110 --> 00:20:13,810
kuondosha kipengele mwisho kutoka safu.

398
00:20:13,810 --> 00:20:17,110
array.push anaongeza kipengele mpya
hadi mwisho wa safu.

399
00:20:17,110 --> 00:20:20,910
array.shift ni aina ya
kama DQ, ni splices nje

400
00:20:20,910 --> 00:20:23,610
kipengele sana kwanza ya safu.

401
00:20:23,610 --> 00:20:27,549
>> Lakini pia kuna mwingine maalum
njia ya safu kuitwa ramani.

402
00:20:27,549 --> 00:20:29,340
Na hii ni aina ya
dhana ya kuvutia.

403
00:20:29,340 --> 00:20:30,930
Hivyo ni wazo la ramani nini?

404
00:20:30,930 --> 00:20:33,880
Itabidi kweli kuona hii
katika lugha zingine kadhaa,

405
00:20:33,880 --> 00:20:38,550
na sisi siyo kuzungumza juu ya
aina ya cartographers ramani hapa,

406
00:20:38,550 --> 00:20:41,480
tunazungumzia ramani kazi.

407
00:20:41,480 --> 00:20:44,110
Katika mazingira tuko
kuzungumza juu hapa, ramani

408
00:20:44,110 --> 00:20:47,950
ni maalum operesheni sisi
anaweza kufanya juu ya safu

409
00:20:47,950 --> 00:20:51,630
kuomba kazi fulani
kwa kila kipengele cha safu hiyo.

410
00:20:51,630 --> 00:20:55,190
na hivyo tunataka kusema katika
kesi hiyo, labda array.map,

411
00:20:55,190 --> 00:21:00,330
na ndani yake, sisi ni kupita
ndani ya ramani ni kazi ambayo tunataka

412
00:21:00,330 --> 00:21:02,430
kutumika kwa kila kipengele moja.

413
00:21:02,430 --> 00:21:07,299
Hivyo ni aina ya sawa na kutumia
kitanzi iterate juu ya kila kipengele

414
00:21:07,299 --> 00:21:09,340
na kuomba hasa
kazi kwa kila kipengele,

415
00:21:09,340 --> 00:21:14,830
tu JavaScript ina hii kujengwa katika
dhana ya ramani ambayo inaweza kutumika.

416
00:21:14,830 --> 00:21:19,700
Na hii ni mantiki kubwa ya
majadiliano juu ya kazi bila majina.

417
00:21:19,700 --> 00:21:22,370
>> Hivyo hebu sema tuna
safu hii ya integers.

418
00:21:22,370 --> 00:21:25,370
Ni wito nums, na ni got tano
mambo ndani yake, moja, mbili, tatu, nne,

419
00:21:25,370 --> 00:21:26,410
tano.

420
00:21:26,410 --> 00:21:30,620
Sasa nataka map baadhi
kazi kwenye safu hii.

421
00:21:30,620 --> 00:21:34,337
Nataka kuwa na kazi kuomba
kwa kila kipengele cha safu.

422
00:21:34,337 --> 00:21:37,420
Naam, hebu kusema kwamba nini nataka
kufanya ni mara mbili tu wote wa mambo.

423
00:21:37,420 --> 00:21:42,520
Kitu ambacho ninaweza kufanya ni tu kutumia kitanzi
kwa var mimi ni sawa na 0, mimi ni chini ya

424
00:21:42,520 --> 00:21:47,390
au kwa sawa 4, mimi pamoja, pamoja, na
kisha mara mbili kila namba moja.

425
00:21:47,390 --> 00:21:49,580
Lakini siwezi pia kufanya kitu kama hiki.

426
00:21:49,580 --> 00:21:53,420
Naweza kusema nums ilikuwa zamani
moja, mbili, tatu, nne, tano,

427
00:21:53,420 --> 00:21:58,310
sasa, ingawa, napenda wewe
kuomba ramani kwenye safu hii

428
00:21:58,310 --> 00:22:00,400
ambapo Ningependa
kuongeza mara mbili kila idadi.

429
00:22:00,400 --> 00:22:02,540
Na hii ndiyo hasa
nini kinatokea hapa.

430
00:22:02,540 --> 00:22:06,870
Lakini taarifa nini mimi kupita
katika kama hoja kwa ramani.

431
00:22:06,870 --> 00:22:09,080
Hii ni kazi bila majina.

432
00:22:09,080 --> 00:22:11,140
Na taarifa mimi si kupewa
hii kazi jina,

433
00:22:11,140 --> 00:22:13,290
Nimekuwa tu iliyotolewa yake orodha parameter.

434
00:22:13,290 --> 00:22:16,370
Na hivyo hii ni mfano
ya kazi bila majina.

435
00:22:16,370 --> 00:22:21,270
>> Sisi kwa ujumla kamwe wito huu
kazi nje ya mazingira ya ramani.

436
00:22:21,270 --> 00:22:24,110
Sisi ni kufafanua kama parameter
ramani, na hivyo sisi si kweli

437
00:22:24,110 --> 00:22:27,910
haja ya kuwa na jina kwa ajili yake kama
Kitu tu kwamba anayejali kuhusu ni ramani

438
00:22:27,910 --> 00:22:30,339
na ni kuelezwa haki
kuna ndani ya ramani.

439
00:22:30,339 --> 00:22:31,880
Na hivyo hii ni kazi bila majina.

440
00:22:31,880 --> 00:22:34,680
Sisi hawajaweza
kufanya hivyo hapo awali.

441
00:22:34,680 --> 00:22:38,400
Ramani baadhi ya kazi kwamba
anapokea parameter moja, num,

442
00:22:38,400 --> 00:22:41,890
na nini kazi hiyo haina
ni faida Hesabu mara 2.

443
00:22:41,890 --> 00:22:45,330
Na hivyo baada ya hii
ramani imekuwa inatumika,

444
00:22:45,330 --> 00:22:50,090
hii ni sasa nini nums inaonekana
kama, mbili, nne, sita, nane, 10.

445
00:22:50,090 --> 00:22:52,090
Na tutaweza pop juu ya yangu
browser window na tu

446
00:22:52,090 --> 00:22:55,240
tuangalie hii
kweli haraka pia.

447
00:22:55,240 --> 00:22:58,000
>> Hivyo nina kifungo mwingine hapa
katika ukurasa wangu wa nyumbani aitwaye mbili.

448
00:22:58,000 --> 00:23:03,570
Na wakati mimi bonyeza mara mbili, na anaelezea
mimi kabla alikuwa moja, mbili, tatu, nne,

449
00:23:03,570 --> 00:23:07,250
tano baada ya mbili, nne, sita, nane, 10.

450
00:23:07,250 --> 00:23:11,930
Na kama mimi kurudi nyuma na bonyeza mara mbili
tena, mbili, nne, sita, nane, 10.

451
00:23:11,930 --> 00:23:17,400
Na kisha baada, nne,
nane, 12, 16, na kisha 20.

452
00:23:17,400 --> 00:23:20,440
Na je, Mimi kufanya katika kazi hii?

453
00:23:20,440 --> 00:23:25,210
Naam, kama sisi tu pop juu ya IDE, na
Mimi kuvuta up kazi yangu bila majina, hapa

454
00:23:25,210 --> 00:23:28,780
kwenye mstari saba kwa njia ya 13, mimi nina
kufanya kidogo kazi dhana hapa,

455
00:23:28,780 --> 00:23:32,240
lakini mimi nina uchapishaji tu nje
nini sasa katika safu.

456
00:23:32,240 --> 00:23:36,580
Kisha katika mstari wa 16, 17,
na 18, kuna ramani yangu.

457
00:23:36,580 --> 00:23:40,930
Hii ni pale ambapo mimi nina kutumia mara dufu hii
kazi kwa kila kipengele moja.

458
00:23:40,930 --> 00:23:43,530
Na kisha kidogo zaidi chini,
Mimi nina kufanya kitu kimoja tu

459
00:23:43,530 --> 00:23:46,640
Mimi nilikuwa kufanya kabla, ila sasa mimi nina
uchapishaji nje yaliyomo ya safu

460
00:23:46,640 --> 00:23:48,167
baadaye.

461
00:23:48,167 --> 00:23:50,500
Lakini yote nimepata kufanyika hapa ni
tu kutumia kazi bila majina

462
00:23:50,500 --> 00:23:53,640
ramani hela safu nzima.

463
00:23:53,640 --> 00:23:58,466
>> Hivyo moja zaidi kubwa ya mada ya majadiliano juu katika
JavaScript ni dhana ya tukio hilo.

464
00:23:58,466 --> 00:24:01,590
Tukio hilo ni jambo ambalo hutokea tu
wakati mtumiaji interacts na mtandao wako

465
00:24:01,590 --> 00:24:04,715
ukurasa, hivyo labda wao bonyeza kitu,
au labda ukurasa imekwisha kupakia,

466
00:24:04,715 --> 00:24:07,200
au labda wameweza wakiongozwa
panya wao juu ya jambo fulani,

467
00:24:07,200 --> 00:24:09,290
au wameweza typed kitu
katika uwanja pembejeo.

468
00:24:09,290 --> 00:24:14,260
Mambo yote haya ni matukio
ambayo yanatokea kwenye mtandao wetu ukurasa.

469
00:24:14,260 --> 00:24:17,460
Na JavaScript ina
uwezo wa kusaidia kitu

470
00:24:17,460 --> 00:24:21,760
aitwaye tukio handler, ambayo
ni kazi callback kwamba

471
00:24:21,760 --> 00:24:23,329
anaitikia kwa tukio html.

472
00:24:23,329 --> 00:24:24,620
Na nini kazi callback?

473
00:24:24,620 --> 00:24:27,328
Naam, ni kwa ujumla mwingine tu
jina kwa kazi bila majina.

474
00:24:27,328 --> 00:24:30,170
Ni kazi ambayo
anaitikia kwa tukio hilo.

475
00:24:30,170 --> 00:24:34,130
Na hii ni mahali ambapo sisi kuja
wazo la kisheria baadhi ya kazi

476
00:24:34,130 --> 00:24:38,060
kwa fulani html sifa.

477
00:24:38,060 --> 00:24:41,420
Wengi html mambo na
msaada kwa ajili ya sifa

478
00:24:41,420 --> 00:24:45,170
kwamba hatukuwa kuzungumzia katika html
video kwa kitu kama juu ya click

479
00:24:45,170 --> 00:24:50,540
au juu ya hover au juu ya mzigo,
wote wa matukio haya

480
00:24:50,540 --> 00:24:53,120
uweze kisha kuandika kazi
kuwa mpango huo kwa matukio hayo

481
00:24:53,120 --> 00:24:56,090
wakati matukio hayo
kutokea kwenye mtandao ukurasa wako.

482
00:24:56,090 --> 00:24:59,170
>> Na hivyo labda html yako
inaonekana kitu kama hiki.

483
00:24:59,170 --> 00:25:02,240
Na mimi kuwa vifungo mbili hapa,
kifungo moja na kifungo mbili,

484
00:25:02,240 --> 00:25:04,620
na hapa nina sasa
inavyoelezwa kitu,

485
00:25:04,620 --> 00:25:11,170
lakini hii ni mahali ambapo sifa juu ya
click ni inaonekana sehemu ya html tag yangu.

486
00:25:11,170 --> 00:25:15,220
Hivyo inaonekana wakati mimi kufafanua nini
kinachoendelea ndani ya kwamba sifa,

487
00:25:15,220 --> 00:25:18,590
ni kwenda kuwa baadhi JavaScript
kazi ambayo anaitikia kwa tukio

488
00:25:18,590 --> 00:25:24,360
labda ya kubonyeza
kifungo moja au kifungo hizo mbili.

489
00:25:24,360 --> 00:25:28,580
>> Nini aina ya baridi kuhusu hili ni sisi
Unaweza kuandika kurefusha maisha tukio handler.

490
00:25:28,580 --> 00:25:32,370
Na hii Handler tukio mapenzi
kujenga tukio kitu.

491
00:25:32,370 --> 00:25:37,000
Na tukio kitu kutuambia
yupi kati ya vifungo mbili ilikuwa clicked.

492
00:25:37,000 --> 00:25:38,064
Sasa jinsi gani kazi hiyo?

493
00:25:38,064 --> 00:25:39,730
Naam, inaweza kuangalia kitu kama hiki.

494
00:25:39,730 --> 00:25:44,860
Hivyo tutakuwa kwanza kufafanua vifungo yetu
kuwa na kukabiliana na callback

495
00:25:44,860 --> 00:25:47,470
kazi ambayo wataitwa
wakati kifungo ni clicked,

496
00:25:47,470 --> 00:25:49,520
tutaweza wito tukio tahadhari jina.

497
00:25:49,520 --> 00:25:53,320
Na taarifa katika kesi zote mbili tuko
kupita katika hii parameter tukio hilo.

498
00:25:53,320 --> 00:25:55,460
Hivyo sisi kuwaita kazi hii
au wakati kazi hii

499
00:25:55,460 --> 00:26:00,330
ni yalisababisha na tukio kinachotokea,
itakuja kujenga hii kitu tukio

500
00:26:00,330 --> 00:26:03,300
na kuupitisha kama
parameter kwa macho jina.

501
00:26:03,300 --> 00:26:07,270
Na kwamba tukio kitu ni
kwenda yana habari

502
00:26:07,270 --> 00:26:09,800
kuhusu ambayo kifungo ilikuwa clicked.

503
00:26:09,800 --> 00:26:11,580
Na jinsi gani kufanya hivyo?

504
00:26:11,580 --> 00:26:13,654
Naam, inaweza kuangalia kitu kama hiki.

505
00:26:13,654 --> 00:26:15,570
Hivyo sasa katika tofauti yangu
JavaScript faili, nipate

506
00:26:15,570 --> 00:26:17,420
una kupata hii
kazi tahadhari jina, ambayo

507
00:26:17,420 --> 00:26:19,500
tena anakubali kuwa parameter tukio hilo.

508
00:26:19,500 --> 00:26:24,640
Na kisha hapa ni mahali ambapo mimi nina kuchunguza
ambayo ilikuwa yalisababisha kifungo,

509
00:26:24,640 --> 00:26:28,100
var trigger sawa na tukio
dot chanzo kipengele.

510
00:26:28,100 --> 00:26:33,150
Nini ilikuwa chanzo kwamba kuundwa
hii kitu tukio hilo kuwa ilipitishwa katika?

511
00:26:33,150 --> 00:26:36,390
Ilikuwa ni kifungo moja au ilikuwa ni kifungo mbili?

512
00:26:36,390 --> 00:26:40,710
>> Na kisha hapa zote mimi nina kufanya ni
uchapishaji nje trigger.innerhtml.

513
00:26:40,710 --> 00:26:43,860
Naam, katika kesi hii, katika hii
mazingira, trigger.innerhtml

514
00:26:43,860 --> 00:26:45,940
ni yale tu yaliyoandikwa juu ya kifungo.

515
00:26:45,940 --> 00:26:48,830
Ni hivyo tu hutokea kama sisi kuruka
nyuma kwa ajili ya pili, kwamba ingekuwa

516
00:26:48,830 --> 00:26:51,670
kuwa nini katika kati ya vitambulisho wale kifungo.

517
00:26:51,670 --> 00:26:54,150
Itakuwa kifungo moja au kifungo hizo mbili.

518
00:26:54,150 --> 00:26:57,320
Na hebu tuangalie
jinsi hii handler tukio ingekuwa

519
00:26:57,320 --> 00:27:01,080
kuangalia kama tulikuwa ni mbio katika mazoezi.

520
00:27:01,080 --> 00:27:03,850
>> Hivyo kwanza ya yote, wewe wameweza
imefungua events.js,

521
00:27:03,850 --> 00:27:06,517
ambayo ni JavaScript faili ambapo
I have inavyoelezwa kazi hii.

522
00:27:06,517 --> 00:27:08,558
Na kama unaweza kuona, ni
pretty much nini hasa

523
00:27:08,558 --> 00:27:10,230
sisi tu kuona kwenye slide pili iliyopita.

524
00:27:10,230 --> 00:27:14,890
Nami kwenda juu ya
ukurasa wa nyumbani tumekuwa kutumia.

525
00:27:14,890 --> 00:27:17,660
Na mimi kuwa hapa kifungo
moja na kifungo hizo mbili.

526
00:27:17,660 --> 00:27:19,820
Na mimi itabidi bonyeza kifungo moja.

527
00:27:19,820 --> 00:27:23,930
Wewe clicked juu ya kifungo moja, kama wewe
Unaweza kuona haki hapa katika tahadhari.

528
00:27:23,930 --> 00:27:25,810
SAWA.

529
00:27:25,810 --> 00:27:28,980
Bonyeza kifungo mbili,
clicked juu ya kifungo mbili.

530
00:27:28,980 --> 00:27:32,150
>> Hivyo vifungo wote wana
sawa kazi wito, sawa?

531
00:27:32,150 --> 00:27:35,840
Wote wawili walikuwa jina tahadhari
tukio, lakini hii kitu tukio

532
00:27:35,840 --> 00:27:41,900
kwamba anapata kuundwa wakati sisi bonyeza
inatuambia ambayo kifungo ilikuwa clicked.

533
00:27:41,900 --> 00:27:44,650
Hatukuwa na kuandika tofauti mbili
kazi au kukabiliana na kuwa na

534
00:27:44,650 --> 00:27:46,470
kupita maelezo yoyote ya ziada.

535
00:27:46,470 --> 00:27:48,220
Sisi ni kutegemea tu juu ya
nini JavaScript mapenzi

536
00:27:48,220 --> 00:27:53,772
kufanya kwa ajili yetu, ambayo ni kujenga kwamba
aina ya tukio kitu kwa niaba yetu.

537
00:27:53,772 --> 00:27:56,730
Kuna mengi zaidi kwa JavaScript kuliko
nini tumekuwa kufunikwa katika video hii,

538
00:27:56,730 --> 00:27:58,521
lakini baada ya haya
msingi lazima kupata wewe

539
00:27:58,521 --> 00:28:00,690
kabisa njia ya muda mrefu kwa
kujifunza kila kitu utasikia

540
00:28:00,690 --> 00:28:04,030
unahitaji kujua kuhusu hii
kuvutia lugha.

541
00:28:04,030 --> 00:28:05,000
Mimi nina Doug Lloyd.

542
00:28:05,000 --> 00:28:07,010
Hii ni CS50.

543
00:28:07,010 --> 00:28:09,181