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【JavaScript】Uncaught TypeError: backButton.previousElementSibling is not a function

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Last updated at Posted at 2026-08-30

はじめに

  • ある要素の前のdomを取得する実装をしていた

問題

  • previousElementSiblingでdomを取得しようとしたができない

解決

  • previousElementSiblingはメソッドではなくプロパティだった
  • previousElementSibling()ではなくpreviousElementSiblingとして解決

終わりに

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