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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <meta charset="UTF-8" />
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
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+ <title>Document</title>
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+ <!-- jsx 语法浏览器不识别 jsx => js 浏览器可识别的语言 -->
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+ <script src="./babel.min.js"></script>
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+ <!-- react的核心库 -->
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+ <script src="./react.development.js"></script>
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+ <!-- 解析react中的dom库 -->
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+ <script src="./react-dom.development.js"></script>
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+ </head>
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+ <body>
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+ <div id="root"></div>
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+ <script type="text/babel">
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+ let root = ReactDOM.createRoot(document.getElementById("root"));
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+ function App() {
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+ return <List />;
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+ }
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+ class List extends React.Component {
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+ constructor() {
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+ super();
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+ this.state = {
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+ list: ["图图", "哆啦A梦", "喜羊羊", "光头强"],
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+ };
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+ }
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+ // 循环：for / while / do while / for in /for of / forEach / map
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+ render() {
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+ // render函数 可以处理所有的js逻辑
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+ const {list} = this.state;
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+ const newsList = list.map((element,index) => <li key={index}>{index+1}-{element}</li>)
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+
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+ return <div>
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+ <ul>
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+ {/* jsx 语法 自动解析 */}
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+ {newsList}
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+ </ul>
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+ </div>;
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+ }
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+ }
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+ root.render(<App />);
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+ </script>
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+ </body>
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+</html>
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