45 lines
1.0 KiB
HTML
45 lines
1.0 KiB
HTML
<!--
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* @Author: chenxuan
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* @Date: 2022-01-08 20:04:29
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* @LastEditTime: 2022-05-02 09:35:50
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* @LastEditors: chenxuan
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-->
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<!DOCTYPE html>
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<html>
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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">
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<title>state</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 Weather 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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ishot:true
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}
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// 解决this指向问题
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this.demo=this.demo.bind(this)
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}
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render(){
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const {ishot}=this.state;
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return <h1 onClick={this.demo}>今天天气很{ishot ? '炎热' : '凉爽'}</h1>
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}
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demo(){
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this.setState({
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ishot:!this.state.ishot
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})
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}
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}
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ReactDOM.render(
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<Weather/>,document.getElementById('app')
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)
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</script>
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</body>
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</html> |