Koj sau ntau dua lossis sib npaug li cas hauv JavaScript?
Koj sau ntau dua lossis sib npaug li cas hauv JavaScript?

Video: Koj sau ntau dua lossis sib npaug li cas hauv JavaScript?

Video: Koj sau ntau dua lossis sib npaug li cas hauv JavaScript?
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Ntau dua lossis sib npaug ntawm tus neeg teb xov tooj (>=)

Cov ntau dua lossis sib npaug rov qab muaj tseeb yog tias sab laug operand yog ntau dua los yog sib npaug mus rau txoj cai operand.

Tsis tas li, koj sau tsawg dua lossis sib npaug li cas hauv JavaScript?

Cov " tsawg dua los yog sib npaug rau" tus neeg ua haujlwm piv cov nqi ntawm ob qho kev qhia. Yog hais tias qhov nthuav qhia ntawm sab laug ntsuas rau tus nqi uas yog tsawg dua los yog sib npaug mus rau qhov ntsuas tus nqi ntawm cov lus qhia ntawm sab xis, " tsawg dua los yog sib npaug rau" tus neeg ua haujlwm rov qab muaj tseeb; txwv tsis pub, cov tus neeg ua haujlwm rov cuav.

Ib sab saum toj, dab tsi yog '$' hauv JavaScript? Hloov tshiab Lub Xya hli ntuj 03, 2019. Tus lej kos npe ($) thiab cov cim hauv qab (_) yog JavaScript tus ID, uas txhais tau hais tias lawv txheeb xyuas ib yam khoom zoo ib yam li lub npe. Cov khoom uas lawv txheeb xyuas muaj xws li cov khoom sib txawv, cov haujlwm, cov khoom, cov xwm txheej, thiab cov khoom.

Hauv qhov no, qhov txawv ntawm == thiab === hauv JS yog dab tsi?

= yog siv los muab cov txiaj ntsig rau qhov sib txawv hauv JavaScript . == yog siv rau kev sib piv nruab nrab ob variables tsis hais cov datatype ntawm variable. === yog siv rau kev sib piv nruab nrab ob qhov sib txawv tab sis qhov no yuav txheeb xyuas hom nruj, uas txhais tau tias nws yuav kuaj cov ntaub ntawv thiab sib piv ob qhov tseem ceeb.

Vim li cas peb siv === hauv JavaScript?

Qhov txawv ntawm == thiab === hauv JavaScript Qhov tseeb, koj yuav tsum ib txwm siv " === "tus neeg teb xov tooj rau kev sib piv cov hloov pauv lossis tsuas yog rau kev sib piv xwb. tus neeg teb xov tooj yog tus neeg ua haujlwm nruj tsis muaj vaj huam sib luag, uas yuav siv hom kev txiav txim siab thaum sib piv ob qhov sib txawv lossis ob qhov txiaj ntsig hauv JavaScript.

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