lovecoding
/
W250913


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./babel.min.js"></script>
    <script src="./react.development.js"></script>
    <script src="./react-dom.development.js"></script>
</head>

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

</html>