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ref让react更容易获取dom，和id比较像。只要在dom上定义ref属性，就可以在组件实例的this.refs中获取到对应的dom元素。
字符串形式的refs
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>字符串形式的ref</title>
</head>
<body>
<!-- 准备一个容器 -->
<div id="test"></div>
<!-- 引入react核心库 -->
<script src="https://cdn.bootcdn.net/ajax/libs/react/18.2.0/umd/react.development.min.js"></script>
<!-- 引入react-dom, 用于支持react操作dom, 需要在核心库之后引入 -->
<script src="https://cdn.bootcdn.net/ajax/libs/react-dom/18.2.0/umd/react-dom.development.min.js"></script>
<!-- 引入babel.js，用于将jsx转化为js -->
<script src="https://cdn.bootcdn.net/ajax/libs/babel-standalone/7.18.7/babel.min.js"></script>
<!-- 引入prop-types -->
<script src="https://cdn.bootcdn.net/ajax/libs/prop-types/15.8.1/prop-types.min.js"></script>
<script type="text/babel">
// 1.创建类组件
class Demo extends React.Component{
render() {
return (
<div>
<input ref="input1" type="text" placeholder="点击按钮提示数据" />
<button onClick={this.showData}>点我提示左侧的数据</button>
<input ref="input2" onBlur={this.showData2 } type="text" placeholder="失去焦点提示数据" />
</div>
)
}
// 展示左侧输入框的数据
showData = () => {
console.log(this);
const { input1 } = this.refs;
alert(input1.value)
}
// 展示右侧输入框内的数据
showData2 = () => {
const { input2 } = this.refs;
alert(input2.value)
}
}
// 挂载
ReactDOM.render(<Demo />, document.getElementById('test'))
</script>
</body>
</html>
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标签：input2,dom,refs,react,组件,ref,三大 From： https://www.cnblogs.com/fqh123/p/16632629.html