108 lines
3.4 KiB
HTML
108 lines
3.4 KiB
HTML
<!--
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* @Author: chenxuan
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* @Date: 2022-01-09 23:07:06
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* @LastEditTime: 2022-01-10 00:02:29
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* @LastEditors: chenxuan
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-->
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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 http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>生命周期函数</title>
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</head>
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<body>
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<div id="app"></div>
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<script src="../package/old/react.development.js"></script>
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<script src="../package/old/react-dom.development.js"></script>
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<script src="../package/old/babel.min.js"></script>
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<script type="text/babel">
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class Count extends React.Component{
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constructor(props){
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console.log("1-constructor")
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super(props)
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this.state={count:100}
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}
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add=()=>{
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let {count}=this.state;
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count+=1;
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this.setState({count})
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}
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death=()=>{
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ReactDOM.unmountComponentAtNode(document.getElementById('app'))
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}
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// 强制更新不受shouldComponentUpdate控制
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force=()=>{
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this.forceUpdate()
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}
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render(){
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console.log("3-render")
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return (
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<div>
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<h2>当前求和为：{this.state.count}</h2>
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<button onClick={this.add}>点我+1</button>
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<button onClick={this.death}>销毁</button>
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<button onClick={this.force}>强制更新</button>
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</div>
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)
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}
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componentWillMount(){
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console.log("2-componentsWillMount")
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}
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componentDidMount(){
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console.log('4-componentDidMount')
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}
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componentWillUnmount(){
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console.log("5-componentWillUnmount")
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}
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// 控制组件更新的阀门
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shouldComponentUpdate(){
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console.log('shouldComponentUpdate')
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return true
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}
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componentWillUpdate(){
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console.log('componentWillUpdate')
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}
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componentDidUpdate(){
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console.log('componentDidUpdate')
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}
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}
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class A extends React.Component{
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state={carName:"奔驰"}
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changeCar=()=>{
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this.setState({carName:"哈弗"})
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}
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render(){
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return (
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<div>
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A
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<B carName={this.state.carName} />
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<button onClick={this.changeCar}>换车</button>
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</div>
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)
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}
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}
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class B extends React.Component{
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componentWillReceiveProps(props){
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console.log("componentWillReceiveProps")
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console.log("------")
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console.log(props)
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}
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render(){
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return (
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<div>
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<li>B</li>
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<li>接收到的值：{this.props.carName}</li>
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</div>
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)
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}
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}
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ReactDOM.render(
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// <Count/>,document.getElementById('app')
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<A/>,document.getElementById('app')
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)
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</script>
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</body>
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</html> |