对于全部输入组件，现用现取为非受控组件 这类组件通常较多使用refjavascript
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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<!-- 准备好容器 -->
<div id="test"></div>
<!-- 引入依赖 ,引入的时候，必须就按照这个步骤-->
<script type="text/javascript" src="../js/react.development.js"></script>
<script type="text/javascript" src="../js/react-dom.development.js"></script>
<script type="text/javascript" src="../js/babel.min.js"></script>
<!--这里使用了babel用来解析jsx语法-->
<script type="text/babel"> class Login extends React.Component{ //现用现取为非受控组件 handleSubmit=()=>{ event.preventDefault() console.log('this',this) const {username,password} = this console.log(`用户名是${username.value},密码是${password.value}`) } render(){ return( <form onSubmit={this.handleSubmit}> 用户名<input ref={c=>this.username = c} type="text" name="username"/> 密码 <input ref={c=>this.password = c} type="password" name="password"/> <button>登陆</button> </form> ) } } ReactDOM.render(<Login/>,document.getElementById('test')) </script>
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随着输入维护状态是受控组件 通常较多使用oChange事件,ref有性能上的缺陷 推荐使用受控组件。html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<!-- 准备好容器 -->
<div id="test"></div>
<!-- 引入依赖 ,引入的时候，必须就按照这个步骤-->
<script type="text/javascript" src="../js/react.development.js"></script>
<script type="text/javascript" src="../js/react-dom.development.js"></script>
<script type="text/javascript" src="../js/babel.min.js"></script>
<!--这里使用了babel用来解析jsx语法-->
<script type="text/babel"> class Login extends React.Component{ // 初始化状态 state={ username:'', password:'', } // 随着输入维护状态是受控组件 ref有性能上的缺陷 推荐使用受控组件 handleSubmit=()=>{ event.preventDefault() console.log('this',this) const {username,password} = this.state console.log(`用户名是${username},密码是${password}`) } userNameChange=(e)=>{ console.log(e.target.value); this.setState({username:e.target.value}) } passwordChange=(e)=>{ console.log(e.target.value); this.setState({password:e.target.value}) } render(){ return( <form onSubmit={this.handleSubmit}> 用户名<input onChange={this.userNameChange} type="text" name="username"/> 密码 <input onChange={this.passwordChange} type="password" name="password"/> <button>登陆</button> </form> ) } } ReactDOM.render(<Login/>,document.getElementById('test')) </script>
</body>
</html>
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