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LeeDDHH/Javascript tips.md

Last active January 13, 2020 11:12
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Javascript tips.md

HTMLCollectionとNodeListの違い

  • getElementsByTagNameやgetElementsByClassNameの返り値はHTMLCollection
    • DOMに変更を加えた際に取得した値が動的に変更されるのがHTMLCollection
  • querySelectorAllの返り値はNodeList
    • 取得した値が変更されないのがNodeList
  • 違いはHTMLCollectionは動的であり、NodeListは静的である

変数が配列かどうか判定

Object.prototype.toString.call(hoge) => [object Array]

もしくは

hoge instanceof Array => true
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