回答編集履歴
1
typoの修正
answer
CHANGED
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@@ -2,10 +2,10 @@
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2
2
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3
3
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```
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4
4
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useEffect(() => {
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5
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-
const
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5
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+
const callback = () => console.log('before unload')
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6
6
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7
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-
window.addEventListener('beforeunload',
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7
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+
window.addEventListener('beforeunload', callback)
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8
8
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9
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-
return () => window.removeEventListener('beforeunload',
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9
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+
return () => window.removeEventListener('beforeunload', callback)
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10
10
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}, [])
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11
11
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```
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