50 lines
1.5 KiB
HTML
50 lines
1.5 KiB
HTML
<!--
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* @Author: chenxuan
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* @Date: 2022-01-02 22:09:19
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* @LastEditTime: 2022-05-02 12:18:45
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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>回调函数形式的refs属性</title>
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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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</head>
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<body>
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<div id="app"></div>
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<script type="text/babel">
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class Demo extends React.Component{
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state={ishot:true}
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// 这种写法，更新时不会调用
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haha=(c)=>{
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this.hehe=c;
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}
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change=()=>{
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const {ishot}=this.state;
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this.setState({ishot:!ishot});
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console.log(this.hehe.value)
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}
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render(){
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const {ishot}=this.state;
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return(
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<div>
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<li>今天天气很{this.state.ishot ? '热':'凉快'}</li>
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<input type="text" ref={this.haha}/>
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<button onClick={this.change}>更新</button>
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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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<Demo/>,document.getElementById('app')
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)
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</script>
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</body>
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</html> |