Video: Dab tsi yog cov ntawv nyeem hauv JavaScript?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A JavaScript khoom ntawv yog ib daim ntawv sib cais ntawm cov npe-tus nqi khub qhwv hauv curly braces. Yam khoom ntawv encapsulate cov ntaub ntawv, enclosing nws nyob rau hauv ib tug huv pob. Qhov no txo qis kev siv cov kev hloov pauv thoob ntiaj teb uas tuaj yeem ua teeb meem thaum sib txuas cov cai.
Ib yam li ntawd, JavaScript yog dab tsi thiab nws hom dab tsi?
Lawv yog hom uas tuaj yeem muab tso rau ib leeg ntawv tus nqi xws li tus lej 5.7, lossis ib txoj hlua ntawm cov cim xws li "nyob zoo". JavaScript txhawb peb cov ntaub ntawv tseem ceeb lossis cov ntaub ntawv yooj yim hom : tus lej. txoj hlua. Boolean.
Ib yam li ntawd, tus nqi ntawm cov ntawv yog dab tsi? A tus nqi ntawv yog ib feem ntawm nqe lus los yog kev qhia uas yuav tsum tau siv raws nraim li nws yog, es tsis yog raws li qhov sib txawv los yog lub ntsiab lus Lingo. Cov ntawv muaj nqis uas koj ntsib nyob rau hauv Lingo yog cov cim cov hlua, cov lej, tus lej lej, cov npe cov tswv cuab, cov lej pov npav, cov cim, thiab qhov tsis tu ncua.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog ib tug literal nyob rau hauv lub programming?
ntawv . Hauv programming , tus nqi sau raws nraim li nws txhais tau tias yuav tsum tau txhais. Hauv qhov sib piv, qhov sib txawv yog lub npe uas tuaj yeem sawv cev rau qhov sib txawv thaum lub sijhawm ua tiav ntawm qhov program. Thiab qhov tsis tu ncua yog lub npe uas sawv cev rau tib tus nqi thoob plaws hauv ib qho kev pab cuam. x yog qhov sib txawv, thiab 3 yog a ntawv.
Cov ntawv nyeem piav qhia li cas nrog piv txwv?
Cov ntawv nyeem . Java Cov ntawv nyeem yog syntactic sawv cev ntawm boolean, cim, zauv, los yog hlua cov ntaub ntawv. Cov ntawv nyeem muab ib qho kev qhia txog qhov tseem ceeb hauv koj qhov kev pab cuam. Rau piv txwv , nyob rau hauv nqe lus nram qab no, ib tug integer variable npe suav yog tshaj tawm thiab muab ib tug integer tus nqi.
Pom zoo:
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