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菜鸟教程 React 实例</title> <script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/react/18.2.0/umd/react.production.min.js" ></script> <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/react-dom/18.2.0/umd/react-dom.production.min.js"></script> <script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/babel-standalone/6.26.0/babel.min.js" ></script> <div id="root"></div> <script type="text/babel"> function ListItem(props) { // 对啦!这里不需要指定key: return <li>{props.value}</li>; } function NumberList(props) { const numbers = props.numbers; const listItems = numbers.map((number) => // 又对啦!key应该在数组的上下文中被指定 <ListItem key={number.toString()} value={number} /> ); return ( <ul> {listItems} </ul> ); } const numbers = [1, 2, 3, 4, 5]; const root = ReactDOM.createRoot(document.getElementById("root")); root.render( <NumberList numbers={numbers} /> ); </script>
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