Reactでコンポーネントから子コンポーネントや要素などを操作するときに便利なrefだが、 意外に調べても使い方が出てこなかったので、様々な利用シーンに合わせて使い道をまとめてみた。 DOMにアクセス import React, { useRef, useEffect } from 'react'; const Component = () => { const el = useRef(null); useEffect(() => { console.log(el.current); }, []); return ( <div ref={el}>DOM</div> ); }; export default Component; import React, { useRef, useEffect } from 'react'; class Child extends React.Compon
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