2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
4 Teb. Thaum lub sij hawm VirtualDOM Reconciliation yog tias muaj ib qho kev tivthaiv tab sis yuav tsis muaj lawm, cov khoom raug txiav txim siab unmounted thiab muab sij hawm los ntxuav (ntawm componentWillUnmount). Thaum rhuav ib tsob ntoo, cov qub DOM nodes raug puas tsuaj. Component instances txais componentWillUnmount.
Vim li cas kuv cov khoom thiaj tsis cuam tshuam React?
Cov ntsiab lus raug tshem tawm thaum niam txiv tivthaiv tsis tau ua ntxiv lawm lossis cov niam txiv tivthaiv ua qhov hloov tshiab uas tsis ua qhov piv txwv no. ReactDOM. unmountComponentAtNode tseem yuav ua rau unmount.
Yuav ua li cas koj nres cov khoom los ntawm kev tshem tawm?
Sing react-router koj tuaj yeem tiv thaiv txoj kev hloov pauv tau yooj yim (uas yuav tiv thaiv kev tiv thaiv unmount) los ntawm kev siv Prompt. Koj yuav tsum tau manually hla tus getUserConfirmation prop uas yog ib qho haujlwm. Koj tuaj yeem hloov kho qhov haujlwm no raws li koj nyiam hauv txhua Router (Browser, Memory lossis Hash) los tsim koj cov lus pom zoo kev cai (piv txwv li.
Dab tsi yog unmounting ib feem?
componentWillUnmount yog qhov kawg ua haujlwm raug hu tam sim ua ntej cov khoom raug tshem tawm ntawm DOM. Nws feem ntau yog siv los ua kom huv si rau ib qho DOM-cov ntsiab lus lossis cov sijhawm ua haujlwm tsim hauv componentWillMount. Ntawm kev noj mov, componentWillUnmount sib haum ua ntej koj tuaj tos koj daim pam noj mov.
Dab tsi ua rau cov khoom tiv thaivWillUnmount?
componentWillUnmount yog invoked tam sim ua ntej ibtivthaiv yog unmounted thiab puas. Ua ib qho kev tu kom tsim nyog hauv txoj kev no, xws li kev siv sijhawm tsis raug cai, tshem tawm cov kev thov hauv lub network, lossis ntxuav txhua qhov kev tso npe uas tau tsim nyob rau hauv componentDidMount.
Pom zoo:
Kev cuam tshuam lossis cuam tshuam?
Affect feem ntau yog cov lus qhia lub ntsiab lus "kom ua rau muaj kev cuam tshuam," xws li " huab cua cuam tshuam nws lub siab." Cov nyhuv feem ntau yog lub ntsiab lus "kev hloov pauv uas tshwm sim thaum ib yam dab tsi ua tiav lossis tshwm sim,"
Kev sib cuam tshuam ntawm tus tswv thiab tus nora cuam tshuam li cas?
Kev sib cuam tshuam ntawm Helmer thiab Nora cuam tshuam li cas? Nora paub tias Helmer qhov kev ua yog npaj los tuav nws tus txiv neej, tsis yog lawv txoj kev sib yuav. … Nora tau dag nws txiv lub npe ntawm cov nyiaj qiv uas nws tau txais los ntawm Krogstad, thiab nws tau hem tias yuav nthuav tawm nws rau Helmer.
Puas tsis cuam tshuam cuam tshuam txog kev ywj pheej?
Cov lus tsis sib xws thiab independent yuav raug siv sib hloov ua lus Askiv, tab sis lawv tsis yog lus piv txwv hauv lej. Independent random variables are uncorrelated, but uncorrelated random variables tsis yog ib txwm ywj siab. Puas yog qhov tsis muaj kev cuam tshuam ib txwm muaj kev ywj pheej?
Vim li cas thiaj siv cov flac uas tsis muaj kev cuam tshuam?
Ib cov ntaub ntawv tsis muaj, FLAC (Free Lossless Audio Codec) yog compressed rau ze li ntawm ib nrab ntawm qhov loj ntawm WAV lossis AIFF ntawm tus qauv sib npaug, tab sis yuav tsum tsis muaj "poob" raws li nws lub suab. FLAC cov ntaub ntawv tseem tuaj yeem muab kev daws teeb meem txog 32-ntsis, 96kHz, zoo dua li CD-zoo.
Tsis cuam tshuam lossis cuam tshuam?
Kuv yuav tsum siv 'tsis cuam tshuam los ntawm' lossis 'tsis cuam tshuam los ntawm'? Qhov tseeb yog 'tsis cuam tshuam los ntawm'. Cov kab lus no feem ntau tsis meej pem vim lawv muaj cov ntawv sau zoo sib xws. Tsis muaj kev cuam tshuam lossis cuam tshuam?
