Koj yuav kuaj xyuas li cas yog tias ib qho khoom yog array JavaScript?
Koj yuav kuaj xyuas li cas yog tias ib qho khoom yog array JavaScript?

Video: Koj yuav kuaj xyuas li cas yog tias ib qho khoom yog array JavaScript?

Video: Koj yuav kuaj xyuas li cas yog tias ib qho khoom yog array JavaScript?
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Hauv JavaScript , peb ua tau kuaj yog tias a variable yog ib array los ntawm kev siv 3 txoj kev, siv tus isArray method, siv tus piv txwv ntawm tus neeg teb xov tooj thiab siv kuaj cov hom constructor yog nws phim ib Array khoom . Lub Array . isArray() method checks seb cov dhau variable yog ib Array khoom.

Tsis tas li ntawd, koj yuav ua li cas xyuas seb qhov khoom puas yog array?

Muaj ntau txoj hauv kev kuaj ib array suav nrog ib khoom los tsis. Siv suav nrog () Txoj kev: Yog array muaj ib khoom / ntsiab tuaj yeem txiav txim siab los ntawm kev siv suav nrog () txoj kev. Txoj kev no rov qab muaj tseeb yog tus array muaj tus khoom /element lwm yam rov qab cuav.

Kuj Paub, vim li cas Typeof array yog khoom hauv JavaScript? Cov hom ntawv ib array yog ib khoom . Hauv JavaScript , arrays yog technically khoom ; tsuas yog nrog tus cwj pwm tshwj xeeb thiab muaj peev xwm. Piv txwv li, arrays muaj a Array . Yuav txawv ib Array khoom los ntawm ib Yam khoom , peb tuaj yeem siv tau Array.

Tom qab ntawd, kuv yuav kuaj xyuas li cas yog tias ib qho array khoob hauv JavaScript?

Cov array tuaj yeem kuaj xyuas yog nws yog khoob los ntawm kev siv lub array . ntev khoom. Cov cuab yeej no rov qab cov naj npawb ntawm cov ntsiab lus hauv array . Yog tus lej yog ntau dua 0, nws ntsuas qhov tseeb.

Puas yog array JavaScript?

JavaScript Array isArray() Method Lub isArray() txoj kev txiav txim seb ib qho khoom puas yog ib qho array . Cov haujlwm no rov qab muaj tseeb yog tias cov khoom yog ib qho array , thiab cuav yog tsis yog.

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