React list and keys
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<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>React list and keys</title> <script src="https://unpkg.com/react@16/umd/react.development.js"></script> <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script> <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script> </head> <body> <div id="root"></div> <script type="text/babel"> function ListItem(props) { return <li>{props.value}</li>; }; function NumberList(props) { const numbers = props.numbers; const listItems = numbers.map((number) => /* Sử dụng đúng */ <ListItem key={number.toString()} value={number * 2} /> ); return ( <ul> {listItems} </ul> ); }; const numbers = [1, 2, 3, 4, 5]; ReactDOM.render( <NumberList numbers={numbers} />, document.getElementById('root') ); </script> </body> </html>
