回答編集履歴
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画面遷移させないならhref属性自体取っ払うか、[Event.preventDefault()](https://developer.mozilla.org/ja/docs/Web/API/Event/preventDefault)を入れるかでも
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画面遷移させないならhref属性自体取っ払うか、[Event.preventDefault()](https://developer.mozilla.org/ja/docs/Web/API/Event/preventDefault)を入れるかでも対応可能です。
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取っ払う
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```html
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<a id="a">aaaaaaaaaaaaaaa</a>
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```
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preventDefault()
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```html
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<a href="#" id="a">aaaaaaaaaaaaaaa</a>
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<script>
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a.addEventListener("click", function(e){
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e.preventDefault();
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});
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</script>
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```
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