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【JavaScript】getElementsByTagNameの結果を配列にして配列のメソッドを使う方法

Last updated at Posted at 2020-11-14

getElementsByTagNameした結果をfindしたかったのですが、そのままでは使えないんですね。
HTMLCollectionオブジェクトが返ってきました。

sliceを使って、配列にしてみました。

const tags = document.getElementsByTagName('script');
const targetTag = Array.prototype.slice.call(tags).find(c => c.src?.match(/test.com/)));

もしくは、Array.fromで、

const tags = document.getElementsByTagName('script');
const targetTag = Array.from(tags).find(c => c.src?.match(/test.com/)));

もしくは、スプレッド演算で、

const tags = document.getElementsByTagName('script');
const targetTag = [...tags].find(c => c.src?.match(/test.com/)));
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