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index3.html
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index3.html
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<!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>状态提升</title>
</head>
<body>
<div id="root"></div>
<!-- <script src="lib/jquery.js"></script> -->
<script src="lib/react.js"></script>
<script src="lib/react-dom.js"></script>
<script src="lib/babel.min.js"></script>
<script type="text/babel">
class InputItem extends React.Component {
constructor(props){
super(props);
this.typeInput = this.typeInput.bind(this)
}
typeInput(e){
this.props.setVal(e.target.value)
}
componentWillReceiveProps(props){
console.log('props:'+JSON.stringify(props))
}
render(){
return (
<p><input type="text" onInput={this.typeInput} value={this.props.val}/></p>
)
}
}
class Wrap extends React.Component {
constructor(props){
super(props);
this.state ={
val:''
}
this.setVal = this.setVal.bind(this)
}
setVal(data){
this.setState((state)=>{
state.val = data
})
}
componentDidMount(){
dconsole.log(this.refs.test)
}
render(){
return (
<div>
<InputItem ref="test" val={this.state.val} setVal={this.setVal}/>
<InputItem val={this.state.val} setVal={this.setVal} />
<button onClick={this.setVal}>赋值</button>
</div>
)
}
}
ReactDOM.render(
<Wrap />,
document.getElementById('root')
)
</script>
</body>
</html>