Video: Cov lus cog tseg hauv cov ntawv sau yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A cog lus yog a TypeScript khoom uas yog siv los sau cov kev pab cuam asynchronous. A cog lus yog ib qho kev xaiv zoo dua thaum nws los tswj ntau yam haujlwm asynchronous, kev ua yuam kev thiab kev nyeem ntawv zoo dua.
Kuj nug, cov lus cog tseg hauv angular yog dab tsi?
Cov lus cog tseg 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. {cov ntaub ntawv} Kev cog lus tau ua lawv txoj kev mus rau hauv haiv neeg JavaScript raws li ib feem ntawm ES6 specification.
Qhov thib ob, cov lus cog tseg hauv JavaScript yog dab tsi? JavaScript | Kev cog lus . Kev cog lus yog siv los tswj cov haujlwm asynchronous hauv JavaScript . Lawv yooj yim los tswj thaum cuam tshuam nrog ntau yam haujlwm asynchronous qhov twg callbacks tuaj yeem tsim kev hu rov qab ntuj raug txim ua rau tsis muaj cai tswj tau.
Ib yam li ntawd, koj sau cov lus cog tseg hauv TypeScript li cas?
Kev cog lus hauv TypeScript . Peb pib los ntawm kev tsim ib qho yooj yim cog lus zoo li no: const ib = new cog lus ((daws, tsis lees paub) => {}); Hauv no cog lus , Kuv tau siv lub cog lus constructor coj nyob rau hauv txoj hlua raws li generic hom rau cov Lus cog tseg daws tus nqi.
Dab tsi yog observables thiab cog lus nyob rau hauv angular?
cog lus emits ib tug nqi thaum Pom tau emits ntau tus nqi. Yog li, thaum tuav HTTP thov, cog lus tuaj yeem tswj hwm ib qho lus teb rau tib qhov kev thov, tab sis dab tsi yog tias muaj ntau cov lus teb rau tib qhov kev thov, peb yuav tsum siv Pom tau.
Pom zoo:
Cov lus cog tseg hauv AngularJS yog dab tsi?
Kev cog lus yog ib yam khoom uas rov qab los ntawm Deferred object. Koj tuaj yeem sau npe sib txawv callbacks rau cov xwm txheej sib txawv daws(), tsis lees paub(), lossis ceeb toom() thiab nws yuav ua tiav thaum lub async ua tiav. Deferred API: Ib qho piv txwv tshiab ntawm defer yog tsim los ntawm kev hu $q
Dab tsi yog lub hom phiaj ntawm delimiters nyob rau hauv cov ntawv sau npe ob hom ntawv cov ntaub ntawv delimiters?
Cov ntaub ntawv delimited yog cov ntawv nyeem siv los khaws cov ntaub ntawv, uas txhua kab sawv cev rau ib phau ntawv, tuam txhab, lossis lwm yam, thiab txhua kab muaj cov teb sib cais los ntawm tus lej
Cov lus cog tseg ua haujlwm li cas hauv JavaScript?
Ua Peb Tus Kheej JavaScript Promises Cov Lus Cog Tseg yuav siv lub luag haujlwm (tus neeg ua haujlwm) uas yuav tsum tau ua tam sim ntawd thiab dhau los ntawm ob txoj haujlwm: daws, uas yuav tsum raug hu thaum Cov Lus Cog Tseg raug daws (dhau qhov tshwm sim), thiab tsis lees paub, thaum nws tsis lees paub. (dhau qhov yuam kev)
Dab tsi yog cov lus cog tseg hauv AngularJS?
Kev cog lus yog ib yam khoom uas rov qab los ntawm Deferred object. Koj tuaj yeem sau npe sib txawv callbacks rau cov xwm txheej sib txawv daws(), tsis lees paub(), lossis ceeb toom() thiab nws yuav ua tiav thaum lub async ua tiav. Deferred API: Ib qho piv txwv tshiab ntawm defer yog tsim los ntawm kev hu $q
Dab tsi yog tus hais lus sau nws lub hom phiaj thiab dab tsi yog yam tseem ceeb uas yuav tsum nco ntsoov txog cov lus hais?
Cov neeg hais lus sau ntawv yog cov ntawv qhia uas tus neeg nthuav qhia siv thaum nthuav qhia qhov kev nthuav qhia. Lawv pab tus neeg nthuav qhia nco txog cov ntsiab lus tseem ceeb thaum muab kev nthuav qhia. Lawv tshwm sim ntawm tus swb thiab tuaj yeem pom tsuas yog los ntawm tus tshaj tawm thiab tsis yog cov neeg tuaj saib