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Video: Dab tsi yog qhov khoom ncua sij hawm hauv Angularjs?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Deferred Object
Kev ncua yog ib khoom uas nthuav tawm cov lus cog tseg. Nws muaj peb txoj hauv kev daws(), tsis lees paub(), thiab ceeb toom(). Thaum twg Kev ncua ua tiav, Koj hu txoj kev daws teeb meem (), tsis lees paub(), thiab ceeb toom(). Nws hu xov tooj rov qab rau npe los daws teeb meem (), tsis lees paub (), lossis ceeb toom () raws li nws tau ua tiav
Kuj paub, qhov kev pabcuam $q ncua sijhawm thiab cog lus li cas?
A kev pabcuam uas pab koj khiav haujlwm asynchronously, thiab siv lawv cov nqi rov qab (lossis kev zam) thaum lawv ua tiav. Qhov no yog ib Kev cog lus /A+-raws li kev siv ntawm cog lus / ncua Cov khoom tshwm sim los ntawm Kris Kowal's Q.
Ib tug kuj tseem nug, $ cog lus li cas hauv AngularJS? Kev cog lus hauv AngularJS yog muab los ntawm kev pabcuam $q built-in. Lawv muab ib txoj hauv kev los ua haujlwm asynchronous hauv koob los ntawm kev sau npe nrog a cog lus khoom. {info} Cov lus cog tseg tau ua rau lawv txoj hauv kev rau hauv JavaScript haiv neeg raws li ib feem ntawm ES6 specification.
Tsuas yog li ntawd, kev cog lus ncua sij hawm yog dab tsi?
version ntxiv: 1.5 ncua . cog lus () txoj kev tso cai rau kev ua haujlwm asynchronous los tiv thaiv lwm cov cai los ntawm kev cuam tshuam nrog kev nce qib lossis cov xwm txheej ntawm nws qhov kev thov sab hauv. Rov qab tsuas yog lub cog lus yam via ncua . cog lus () yog li lwm tus lej tuaj yeem sau npe hu rov qab lossis tshawb xyuas lub xeev tam sim no.
Tom qab ntawd hauv AngularJS yog dab tsi?
. tom qab ntawd hauv AngularJS . 1.. ces yog hu rau HTTP cog lus khoom thiab xa rov qab cov khoom cog lus tshiab. 2.o vim. ces rov qab cov khoom cog lus tshiab, nws tuaj yeem siv rau kev hu xov tooj.
Pom zoo:
Dab tsi yog lub sij hawm ncua sij hawm relay uas siv lub sij hawm RC Circuit Court?
Kev tsim tshiab ntawm lub sij hawm ncua relays siv hluav taws xob circuits nrog resistor-capacitor (RC) tes hauj lwm los tsim lub sij hawm ncua, ces energize ib txwm (instantaneous) electromechanical relay coil nrog cov hluav taws xob Circuit Court cov zis
Qhov txawv ntawm lub sij hawm lapse thiab lub sij hawm lapse yog dab tsi?
Ib qho hyperlapse, ntawm qhov tod tes, tsis muaj kev txwv li no: 'Nws ua rau lub koob yees duab txav mus rau ntau qhov deb,' Tompkinson hais. Hauv lwm lo lus, hyperlapse zoo ib yam li lub sijhawm ua haujlwm, tab sis nrog ntau qhov kev sib tw
Dab tsi yog ncua sij hawm hauv AngularJS?
Deferred Object: Deferred yog ib yam khoom uas nthuav tawm cov lus cog tseg. Nws muaj peb txoj hauv kev daws(), tsis lees paub(), thiab ceeb toom(). Deferred rov cog lus khoom. Thaum Deferred tiav, Koj hu rau txoj kev daws teeb meem (), tsis lees paub (), thiab ceeb toom ()
Dab tsi yog qhov ncua sij hawm ntau lub hauv paus tsim?
Hauv ntau lub hauv paus tsim, cov ntaub ntawv hauv paus ib txhij tau sau los ntawm ob lossis ntau tus cwj pwm. Hauv kev tsim qauv ncua sij hawm, kev sau cov ntaub ntawv hauv paus rau kev coj tus cwj pwm tom ntej yog pib tom qab lub hauv paus rau kev coj cwj pwm ua ntej
Koj txhais li cas compile lub sij hawm tas li hauv Java Dab tsi yog siv compile lub sij hawm tas li?
Compile-time constants thiab variables. Cov ntaub ntawv Java hais tias: Yog hais tias ib hom thawj zaug los yog ib txoj hlua txhais tau tias yog qhov tas li thiab tus nqi raug paub thaum lub sij hawm sau, lub compiler hloov lub npe tas li txhua qhov chaw hauv cov cai nrog nws tus nqi. Qhov no yog hu ua compile-time constant