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@@ -0,0 +1,64 @@
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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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+ function App() {
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+ return (
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+ <div>
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+ <Flower />
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+ </div>
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+ )
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+ }
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+ class Flower extends React.Component {
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+ constructor(props) {
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+ super(props);
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+ this.state = {
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+ currentTime: new Date(),
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+ count: 0
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+ }
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+ }
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+ // 挂载
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+ componentDidMount() {
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+ console.log("挂载");
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+ this.timer = setInterval(() => {
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+ this.setState((state, props) => {
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+ currentTime: new Date();
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+ count: 2
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+ })
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+ }, 1000)
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+ }
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+ // 更新
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+ componentDidUpdate() {
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+ console.log("更新")
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+ }
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+ // 卸载
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+ componentWillUnMount() {
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+ clearInterval(this.timer);
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+ }
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+ render() {
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+ return (
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+ <div>
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+ <h1>类组件</h1>
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+ <h2>{this.state.count}</h2>
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+ <h3>{this.state.currentTime.toLocaleString()}</h3>
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+ </div>
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+ )
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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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+
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+</html>
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zheng