41 lines
1.1 KiB
HTML
41 lines
1.1 KiB
HTML
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<!--
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* @Author: chenxuan
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* @Date: 2022-01-02 23:49:08
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* @LastEditTime: 2022-01-02 23:51:41
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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>createRef</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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myef=React.createRef();
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getValue=()=>{
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alert(this.myef.current.value)
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}
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render(){
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return(
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<div>
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<input type="text" ref={this.myef}/>
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<button onClick={this.getValue}>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>
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