Video: Dab tsi yog kev siv lim hauv JavaScript?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov lim () txoj kev tsim ib tug tshiab array los ntawm lim tawm tag nrho cov ntsiab lus uas tsis dhau qhov kev sim ua los ntawm callback() muaj nuj nqi. Internally, lub lim () txoj kev iterates hla txhua lub caij ntawm ib qho array thiab dhau txhua lub caij mus rau callback() muaj nuj nqi.
Ib yam li ntawd, JavaScript lim rov qab li cas?
Kev piav qhia. lim () hu ib qho kev hu rov qab ua haujlwm ib zaug rau txhua lub ntsiab lus hauv ib qho array, thiab tsim ib qho tshiab ntawm tag nrho cov nqi uas hu rov qab rov qab los tus nqi uas yuam kom muaj tseeb.
Tsis tas li ntawd, koj yuav lim cov array hauv JavaScript li cas? The syntax var newArray = array . lim (function(khoom) { rov qab mob; }); Cov khoom sib cav yog siv rau lub caij tam sim no hauv lub array raws li lim () xyuas nws tawm tsam qhov xwm txheej. Qhov no muaj txiaj ntsig zoo rau kev nkag mus rau cov khoom, hauv cov khoom.
Ib yam li ntawd, koj tuaj yeem nug, MAP lim thiab txo qis hauv JavaScript yog dab tsi?
daim ntawv qhia tsim ib lub array tshiab los ntawm kev hloov txhua yam hauv ib qho array, ib tus zuj zus. lim tsim cov array tshiab los ntawm kev tshem tawm cov ntsiab lus uas tsis koom nrog. txo , ntawm qhov tod tes, siv tag nrho cov ntsiab lus hauv ib qho array, thiab txo lawv mus rau hauv ib qho nqi.
=> JavaScript txhais li cas?
los ntawm Stephen Chapman. Hloov tshiab Lub Xya hli ntuj 03, 2019. Tus lej kos npe ($) thiab cov cim hauv qab (_) yog JavaScript identifiers, uas xwb txhais tau tias tias lawv txheeb xyuas ib yam khoom ib yam li lub npe yuav . Cov khoom uas lawv txheeb xyuas muaj xws li cov khoom sib txawv, cov haujlwm, cov khoom, cov xwm txheej, thiab cov khoom.
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