40 lines
1.1 KiB
HTML
40 lines
1.1 KiB
HTML
<!--
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* @Author: chenxuan
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* @Date: 2022-01-02 21:23:11
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* @LastEditTime: 2022-03-28 23:24:12
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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>回调函数形式的refs属性</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 Demo extends React.Component{
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haha1=()=>{
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const {haha}=this;
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alert(haha.value);
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}
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render(){
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return(
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<div>
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{/*这种内联函数，更新会多次调用 时有bug */}
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<input type="text" ref={(c)=>this.haha=c}/>
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<button onClick={this.haha1}>点我</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> |