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@@ -0,0 +1,107 @@
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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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+ // props
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+ // state
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+ class News extends React.Component {
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+ state = {
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+ name: '图图',
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+ age: 3,
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+ sum: 0,
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+ isShow: true
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+ }
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+ // handleClick = () => {
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+ // console.log("触发")
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+ // // this.state.age += 2;
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+ // console.log(this)
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+ // }
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+ handleClick() {
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+ this.setState({
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+ age: this.state.age + 10,
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+ name: 'Tom'
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+ })
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+ }
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+ handleAdd() {
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+ this.setState((val) => ({ sum: val.sum + 1 })
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+ )
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+ }
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+ handleReduce() {
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+ this.setState({
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+ sum: this.state.sum - 1
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+ })
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+ }
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+ render() {
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+ // console.log(this, '11')
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+ // return (
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+ // <div>
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+ // <h1>父组件</h1>
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+ // <h1>数值:{this.state.sum}</h1>
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+ // <button onClick={this.handleAdd.bind(this)}>+1</button>
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+ // <button onClick={this.handleReduce.bind(this)}>-1</button>
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+ // <h3>我叫{this.state.name},今年{this.state.age}岁</h3>
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+ // <button onClick={this.handleClick.bind(this)}>+2</button>
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+ // <button onClick={() => {
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+ // console.log(this)
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+ // }}>+2</button>
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+ // <Child userInfo={this.state.name} />
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+ // </div >
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+ // )
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+ return <Child userInfo={this.state.name} />
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+ }
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+ }
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+ class Child extends React.Component {
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+ constructor() {
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+ console.log('con')
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+ super();
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+ this.state = {
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+ weather: "晴天"
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+ }
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+ this.handleWeather = this.handleWeather.bind(this);
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+ }
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+ // 挂载：constructor render componentDidMount
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+ // 更新：render componentDidUpdate
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+ componentDidMount() {
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+ console.log("挂载")
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+ }
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+ componentDidUpdate() {
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+ console.log("222")
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+ }
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+ componentWillUnMount() {
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+ console.log("卸载")
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+ }
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+ handleWeather() {
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+ this.setState({
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+ weather: "雨天"
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+ })
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+ console.log(this)
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+ }
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+ render() {
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+ console.log("render")
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+ return (
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+ <div>
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+ <h1>外面是{this.state.weather},我叫{this.props.userInfo}</h1>
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+ <button onClick={this.handleWeather}>修改天气</button>
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+ </div>
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+ )
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+ }
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+ }
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+ const element = <News />
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+ const container = document.getElementById("root");
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+ const root = ReactDOM.createRoot(container)
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+ root.render(element);
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+ </script>
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+</body>
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+
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+</html>
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zheng