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Dab tsi yog txoj hauv kev los tsim cov khoom hauv JavaScript?
Dab tsi yog txoj hauv kev los tsim cov khoom hauv JavaScript?

Video: Dab tsi yog txoj hauv kev los tsim cov khoom hauv JavaScript?

Video: Dab tsi yog txoj hauv kev los tsim cov khoom hauv JavaScript?
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Hauv JavaScript, muaj plaub txoj hauv kev los siv los tsim ib qho khoom:

  1. Yam khoom Cov ntawv nyeem.
  2. Tus neeg tsav tsheb tshiab lossis tus tsim qauv.
  3. Yam khoom . tsim txoj kev.
  4. Chav kawm.

Ntxiv mus, koj tuaj yeem tsim ib qho khoom hauv JavaScript?

JavaScript muaj ib tug xov tooj ntawm predefined khoom . Ntxiv rau, koj tuaj yeem tsim koj tus kheej khoom . Koj tuaj yeem tsim ib qho khoom siv ib khoom pib. Xwb, koj ua tau ua ntej tsim ib tug constructor muaj nuj nqi thiab ces instantiate ib khoom invoking uas muaj nuj nqi ua ke nrog tus neeg teb xov tooj tshiab.

Kuj Paub, dab tsi yog JavaScript object? Cov khoom hauv Javascript . Loosely hais lus, khoom hauv JavaScript tej zaum yuav txhais tau tias yog ib qho kev sau tsis raug ntawm cov ntaub ntawv cuam tshuam, ntawm cov txheej txheem qub lossis siv siv, nyob rau hauv daim ntawv ntawm "qhov tseem ceeb: tus nqi" khub. Cov yuam sij no tuaj yeem hloov pauv lossis ua haujlwm thiab hu ua cov khoom thiab cov txheej txheem, feem, hauv cov ntsiab lus ntawm ib qho khoom.

Hais txog qhov no, dab tsi yog txoj hauv kev yooj yim thiab nrov tshaj plaws los tsim cov khoom hauv JavaScript?

Siv cov dej num raws li chav kawm: Ib qho ntawm Txoj hauv kev yooj yim tshaj plaws rau instantiate ib yam khoom hauv JavaScript . Peb txhais cov classical JavaScript muaj nuj nqi thiab tsim ib yam khoom ntawm kev ua haujlwm siv lo lus tshiab. Cov khoom thiab txoj kev kev ua haujlwm yog tsim siv lo lus tseem ceeb no.

Dab tsi tuaj yeem siv los tsim cov khoom?

1) Siv lo lus tshiab: Siv lo lus tshiab yog txoj hauv kev yooj yim tshaj plaws rau tsim ib khoom . Qhov no yog txoj hauv kev tshaj plaws tsim ib khoom hauv java. Yuav luag 99% ntawm khoom yog tsim nyob rau hauv no txoj kev. Los ntawm kev siv txoj kev no peb ua tau hu rau txhua tus neeg tsim khoom uas peb xav hu (tsis muaj kev sib cav lossis cov neeg tsim khoom parameterized).

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