React受控组件与非受控组件深入讲解

<script type="text/babel">
	//创建组件
	class Login extends React.Component{
		handleSubmit = (event)=>{
			event.preventDefault() //阻止表单提交
			const {username,password} = this
			alert(`你输入的用户名是：${username.value},你输入的密码是：${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>登录</button>
				</form>
			)
		}
	}
	//渲染组件
	ReactDOM.render(<Login/>,document.getElementById('test'))
</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>

function sum(a){
	return(b)=>{
		return (c)=>{
			return a+b+c
		}
	}
}

<script type="text/babel">
	class Login extends React.Component{
		state = {
			username:'', //用户名
			password:'' //密码
		}
		//保存表单数据到状态中
		saveFormData = (dataType)=>{
			return (event)=>{
				this.setState({[dataType]: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.saveFormData('username')} type="text" name="username"/>
					密码：<input onChange={this.saveFormData('password')} type="password" name="password"/>
					<button>登录</button>
				</form>
			)
		}
	}
	ReactDOM.render(<Login/>,document.getElementById('test'))
</script>

<script type="text/babel">
	class Login extends React.Component{
		state = {
			username:'', //用户名
			password:'' //密码
		}
		//保存表单数据到状态中
		saveFormData = (dataType,event)=>{
			this.setState({[dataType]: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={event => this.saveFormData('username',event) } type="text" name="username"/>
					密码：<input onChange={event => this.saveFormData('password',event) } type="password" name="password"/>
					<button>登录</button>
				</form>
			)
		}
	}
	//渲染组件
	ReactDOM.render(<Login/>,document.getElementById('test'))
</script>