前言
react中的受控组件和非受控组件
内容
定义一个包含表单的组件,输入用户名密码后, 点击登录提示输入信息
理解
包含表单组件的分类非受控组件,受控组件
非受控组件
代码语言：javascript复制<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<!--创建"容器"-->
<div id="login"></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js-->
<script type="text/javascript" src="../js/babel.min.js"></script>
<script type="text/babel">
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 (
<div>
<form onSubmit={this.handleSubmit}>
用户名: <input ref={ c => this.username = c } name="username" type="text"/>
密 码: <input ref={ c => this.password = c } name="password" type="password"/>
<button>登录</button>
</form>
</div>
);
}
}
ReactDOM.render(<Login />, document.getElementById('login'))
</script>
</body>
</html>受控组件
代码语言：javascript复制<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<!--创建"容器"-->
<div id="login"></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js-->
<script type="text/javascript" src="../js/babel.min.js"></script>
<script type="text/babel">
class Login extends React.Component {
state = {
username: "",
password: ""
}
saveUserName = (event) => {
this.setState({username:event.target.value})
}
savePassword = (event) => {
this.setState({password:event.target.value})
}
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 (
<div>
<form onSubmit={this.handleSubmit}>
用户名: <input onChange={this.saveUserName} name="username" type="text"/>
密 码: <input onChange={this.savePassword} name="password" type="password"/>
<button>登录</button>
</form>
</div>
);
}
}
ReactDOM.render(<Login />, document.getElementById('login'))
</script>
</body>
</html>函数柯里化
代码语言：javascript复制<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<!--创建"容器"-->
<div id="login"></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js-->
<script type="text/javascript" src="../js/babel.min.js"></script>
<script type="text/babel">
class Login extends React.Component {
state = {
username: "",
password: ""
}
saveFormData = (dataType) => {
return (event) => {
this.setState({[dataType]:event.target.value})
}
}
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 (
<div>
<form onSubmit={this.handleSubmit}>
用户名: <input onChange={this.saveFormData('username')} name="username" type="text"/>
密 码: <input onChange={this.saveFormData('password')} name="password" type="password"/>
<button>登录</button>
</form>
</div>
);
}
}
ReactDOM.render(<Login />, document.getElementById('login'))
</script>
</body>
</html>
