<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>

</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
    class LoginForm extends React.Component{
        constructor(props){
            super(props)
            // 初始化状态
            this.state={
                pwd:''
            }

            this.handleSubmit = this.handleSubmit.bind(this)
            this.handleChange = this.handleChange.bind(this)
        }
        handleSubmit(event){
            // 阻止默认提交
           event.preventDefault()
           const name = this.nameInput.value
           const {pwd} = this.state
           alert(`准备提交的用户名为${name},密码为${pwd}`)

        }
        handleChange(event){
            // 1.读取输入的值
            const pwd = event.target.value
            // 2.更新状态
            this.setState ({pwd})

        }
        render(){
            return(
                <form action="" onSubmit={this.handleSubmit}>
                用户名：<input type="text" ref={input=>this.nameInput = input}/>
                密码<input type="text" value={this.state.pwd} onChange={this.handleChange}/>
                <input type="submit" value="登录"/>
                </form>
            )
        }
    }

    ReactDOM.render(<LoginForm/>,document.getElementById('app'))
    </script>
    
</body>
</html>
效果图

Video_2020-10-11_124132.gif
react搜集表单数据

react搜集表单数据

效果图
