html原型
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>简单组件</title>
</head>
<body>
<div id="app">
</div>
<script src="./lib/react.development.js"></script>
<script src="./lib/react-dom.development.js"></script>
<script src="./lib/prop-types.js"></script>
<script src="./lib/babel.min.js"></script>
<script type="text/babel">
// 复杂的组件 es6 class
class Complex extends React.Component{
constructor(props){
super(props)
}
render(){
// 通过this.props 来接收
console.log(this.props);
// this.props.hobby = '打篮球'
// this.props = {}
const {name,sex,age} = this.props
return (
<div>
<h1>姓名:{name}</h1>
<h1>性别:{sex}</h1>
<h1>年龄:{age}</h1>
</div>
)
}
}
const info = {
name:'张三',
// sex:'男',
// age:18
}
Complex.propTypes = {
name:PropTypes.string.isRequired
}
Complex.defaultProps = {
sex:'男',
age:19
}
// 定义一个人员信息 信息从外部传入
// 1 姓名必须指定 2 性别没有指定的话 默认为男 3年龄没有指定的话 默认为18
ReactDOM.render(<Complex {...info}/>,document.getElementById("app"))
</script>
</body>
</html>
实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>todoList</title>
</head>
<body>
<div id="app">
</div>
<script src="./lib/react.development.js"></script>
<script src="./lib/react-dom.development.js"></script>
<script src="./lib/prop-types.js"></script>
<script src="./lib/babel.min.js"></script>
<script type="text/babel">
// 复杂的组件 es6 class
class App extends React.Component{
constructor(props){
super(props)
this.state = {
list:[
'张飞',
'赵云',
'关羽'
],
}
}
appAdd = (value)=>{
console.log(value);
// 操作state
const {list} = this.state;
list.unshift(value)
// 更新state
this.setState({
list
})
}
render(){
// 子组件传值给父组件 一样是通过传递属性 props传递 只不过传递过去的是一个函数而已
const {list} = this.state
return (
<div>
<Add add={this.appAdd}/>
<List list={list}/>
</div>
)
}
}
class Add extends React.Component{
constructor(props){
super(props)
this.state = {
value:''
}
}
handelAdd = ()=>{
// 拿到input的值
//const value = this.input.value.trim()
const value = this.state.value.trim()
if(!value){
return
}
this.props.add(value)
// 要把数据传递给父组件 子组件操作父组件
// this.input.value = ''
// this.state.value = ''
this.setState({
value:''
})
}
handelChange = (e)=>{
this.setState({
value:e.target.value
})
}
render(){
const {value} = this.state
return (
<div>
//<input type="text" ref={(input)=>{this.input = input}}/><button onClick={this.handelAdd}>添加</button>
<input type="text" value={value} onChange={this.handelChange}/><button onClick={this.handelAdd}>添加</button>
</div>
)
}
}
function List(props){
return(
<div>
<ul>
{
props.list && props.list.map((item,index)=>
<li key={index}>{item}</li>
)
}
</ul>
</div>
)
}
ReactDOM.render(<App/>,document.getElementById("app"))
</script>
</body>
</html>
