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+<!DOCTYPE html>
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+<html lang="en">
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+
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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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+ <script src="./babel.min.js"></script>
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+ <script src="./react.development.js"></script>
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+ <script src="./react-dom.development.js"></script>
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+</head>
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+
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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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+ /**
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+ * 组件：
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+ * 1.函数组件
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+ * 2.类组件
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+ */
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+ // 函数组件只能有一个根节点 大驼峰命名法
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+ function HelloWorld() {
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+ return (
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+ <div>
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+ <h1>你好</h1>
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+ </div>
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+ // <div></div>
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+ )
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+ }
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+ // 类组件只能有一个根节点 大驼峰命名法
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+ // 必须用render渲染页面
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+ // 必须继承React.Component
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+ class EveryDay extends React.Component {
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+ render() {
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+ return (
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+ <div>
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+ <h1>哈哈哈哈</h1>
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+ </div>
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+ // div
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+ )
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+ }
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+ }
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+ root.render(<EveryDay />);
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+ </script>
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+</body>
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+
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+</html>
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zheng