Video: Dab tsi yog ngOnInit hauv angular?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
ngOnInit yog lub neej voj voog hu ua los ntawm Angular qhia tias Angular yog ua tiav tsim cov khoom siv.
Kuj paub yog, dab tsi yog ngOnInit () hauv angular?
ngOnInit() link mode_edit code. Ib txoj kev hu rov qab uas tau hu tam sim ntawd tom qab qhov kev hloov pauv hloov pauv tau tshawb xyuas cov lus qhia cov ntaub ntawv sib khi rau thawj zaug, thiab ua ntej ib qho ntawm cov saib lossis cov ntsiab lus me nyuam raug kuaj xyuas. Nws yog invoked ib zaug thaum cov lus qhia yog instantiated.
Dab tsi yog qhov txawv ntawm ngOnInit thiab ngAfterViewInit? ngOnInit () raug hu tam sim tom qab cov lus qhia cov ntaub ntawv-txhim kho cov khoom tau raug kuaj thawj zaug, thiab ua ntej ib qho ntawm nws cov menyuam tau raug kuaj xyuas. ngAfterViewInit () raug hu ua tom qab ib qho kev pom, thiab nws cov menyuam txoj kev xav, raug tsim.
Tsis tas li ntawd, dab tsi yog constructors nyob rau hauv angular?
A tus tsim yog ib txoj kev tshwj xeeb uas yuav raug hu thaum twg peb tsim cov khoom tshiab. Thiab feem ntau yog siv los pib cov tub kawm. Nws yog ib tug feature ntawm chav kawm ntawv (typescript) nws tus kheej, ib yam khoom-oriented tsim tswvyim tsis Angular.
Dab tsi yog nuv hauv angular?
Angular tsim thiab muab cov khoom sib txuas nrog rau lawv cov menyuam, xyuas thaum lawv cov ntaub ntawv sib khi cov khoom hloov pauv, thiab rhuav tshem lawv ua ntej tshem tawm ntawm DOM. Angular muaj lifecycle nuv uas muab kev pom rau hauv lub neej tseem ceeb no thiab muaj peev xwm ua tau thaum lawv tshwm sim.
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