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Showing content from https://developer.mozilla.org/ja/docs/Web/API/Element/hasAttribute below:

Element: hasAttribute() メソッド - Web API

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Element.hasAttribute() メソッドは、指定した要素が指定した属性を持つかどうかを示す論理値を返します。

js

hasAttribute(name)

name

属性の名前を示す文字列です。

論理値です。

js

const foo = document.getElementById("foo");
if (foo.hasAttribute("bar")) {
  // do something
}

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