componentDidMountと同じことがしたい。
第二引数に空の配列を渡す。
const [count, setCount] = useState(0);
useEffect(() => {
console.log(count);
setCount(count + 1);
}, []);
こうなる。
ハッピー。
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最初に一回だけ動くuseEffect（componentDidMount的な）
Last updated at Posted at 2020-04-14
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