回答編集履歴
1
chousei
answer
CHANGED
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@@ -1,4 +1,9 @@
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1
1
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```javascript
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2
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+
<button class="A B C">btn</button>
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3
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+
<script>
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4
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+
document.querySelector('.A').addEventListener('click',e=>{
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2
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-
['B','C','X','Y'].forEach(x=>
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5
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+
['B','C','X','Y'].forEach(x=>e.target.classList.toggle(x));
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6
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+
});
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7
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+
</script>
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3
8
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4
9
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```
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