react学习---表单数据收集---受控组件(输入框中的数据受state管理)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>2_受控组件</title>
</head>
<body>
    <!-- 准备好一个“容器” -->
    <div id="test"></div>
    
    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom，用于支持react操作DOM -->
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <!-- 引入babel，用于将jsx转为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">
        //创建组件
        class Login extends React.Component{

            //初始化状态
            state = {
                username:'', //用户名
                password:'' //密码
            }

            //保存用户名到状态中
            saveUsername = (event)=>{
                this.setState({username:event.target.value})
            }

            //保存密码到状态中
            savePassword = (event)=>{
                this.setState({password:event.target.value})
            }

            //表单提交的回调
            handleSubmit = (event)=>{
                event.preventDefault() //阻止表单提交
                const {username,password} = this.state
                alert(`你输入的用户名是：${username},你输入的密码是：${password}`)
            }

            render(){
                return(
                    <form onSubmit={this.handleSubmit}>
                        用户名：<input onChange={this.saveUsername} type="text" name="username"/>
                        密码：<input onChange={this.savePassword} type="password" name="password"/>
                        <button>登录</button>
                    </form>
                )
            }
        }
        //渲染组件
        ReactDOM.render(<Login/>,document.getElementById('test'))
    </script>
</body>
</html>