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29 lines
745 B
29 lines
745 B
import React from 'react'
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import { createRef } from 'react'
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class Input extends React.Component {
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// 这个实例属性是可以定义的，语义化即可
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// createRef() 调用后可以返回一个容器,该容器可以存储被 ref 所表示的节点 就是说 input 这个 DOM 放在了 myRef 这个属性上
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msgRef = createRef()
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getValue = () => {
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// current.value 是指当前的 value 值
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console.log(this.msgRef.current.value)
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}
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render() {
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return (
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<>
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{/* 通过 ref 属性获取 msgRef */}
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<input type="text" ref={this.msgRef} />
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<button onClick={this.getValue}>获取输入框的值</button>
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</>
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)
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}
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}
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function App() {
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return <Input></Input>
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}
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export default App
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