111 lines
3.5 KiB
HTML
111 lines
3.5 KiB
HTML
|
<!--
|
|||
|
|
* @Author: chenxuan
|
|||
|
|
* @Date: 2022-01-11 23:53:36
|
|||
|
|
* @LastEditTime: 2022-01-12 23:43:16
|
|||
|
|
* @LastEditors: chenxuan
|
|||
|
|
-->
|
|||
|
|
<!DOCTYPE html>
|
|||
|
|
<html lang="en">
|
|||
|
|
<head>
|
|||
|
|
<meta charset="UTF-8">
|
|||
|
|
<meta http-equiv="X-UA-Compatible" content="IE=edge">
|
|||
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|||
|
|
<title>生命周期函数</title>
|
|||
|
|
<script src="../package/new/react.development.js"></script>
|
|||
|
|
<script src="../package/new/react-dom.development.js"></script>
|
|||
|
|
<script src="../package/new/babel.min.js"></script>
|
|||
|
|
</head>
|
|||
|
|
<body>
|
|||
|
|
<div id="app"></div>
|
|||
|
|
<script type="text/babel">
|
|||
|
|
class Count extends React.Component{
|
|||
|
|
constructor(props){
|
|||
|
|
console.log("1-constructor")
|
|||
|
|
super(props)
|
|||
|
|
this.state={count:100}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
add=()=>{
|
|||
|
|
let {count}=this.state;
|
|||
|
|
count+=1;
|
|||
|
|
this.setState({count})
|
|||
|
|
}
|
|||
|
|
death=()=>{
|
|||
|
|
ReactDOM.unmountComponentAtNode(document.getElementById('app'))
|
|||
|
|
}
|
|||
|
|
// 强制更新不受shouldComponentUpdate控制
|
|||
|
|
force=()=>{
|
|||
|
|
this.forceUpdate()
|
|||
|
|
}
|
|||
|
|
render(){
|
|||
|
|
console.log("3-render")
|
|||
|
|
return (
|
|||
|
|
<div>
|
|||
|
|
<h2>当前求和为：{this.state.count}</h2>
|
|||
|
|
<button onClick={this.add}>点我+1</button>
|
|||
|
|
<button onClick={this.death}>销毁</button>
|
|||
|
|
<button onClick={this.force}>强制更新</button>
|
|||
|
|
</div>
|
|||
|
|
)
|
|||
|
|
}
|
|||
|
|
// UNSAFE_componentWillMount
|
|||
|
|
componentWillMount(){
|
|||
|
|
console.log("2-componentsWillMount")
|
|||
|
|
}
|
|||
|
|
componentDidMount(){
|
|||
|
|
console.log('4-componentDidMount')
|
|||
|
|
}
|
|||
|
|
componentWillUnmount(){
|
|||
|
|
console.log("5-componentWillUnmount")
|
|||
|
|
}
|
|||
|
|
// 控制组件更新的阀门
|
|||
|
|
shouldComponentUpdate(){
|
|||
|
|
console.log('shouldComponentUpdate')
|
|||
|
|
return true
|
|||
|
|
}
|
|||
|
|
// UNSAFE_componentWillUnmount
|
|||
|
|
componentWillUpdate(){
|
|||
|
|
console.log('componentWillUpdate')
|
|||
|
|
}
|
|||
|
|
componentDidUpdate(){
|
|||
|
|
console.log('componentDidUpdate')
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
class A extends React.Component{
|
|||
|
|
state={carName:"奔驰"}
|
|||
|
|
changeCar=()=>{
|
|||
|
|
this.setState({carName:"哈弗"})
|
|||
|
|
}
|
|||
|
|
render(){
|
|||
|
|
return (
|
|||
|
|
<div>
|
|||
|
|
A
|
|||
|
|
<B carName={this.state.carName} />
|
|||
|
|
<button onClick={this.changeCar}>换车</button>
|
|||
|
|
</div>
|
|||
|
|
)
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
class B extends React.Component{
|
|||
|
|
// UNSAFE_componentWillReceiveProps
|
|||
|
|
componentWillReceiveProps(props){
|
|||
|
|
console.log("componentWillReceiveProps")
|
|||
|
|
console.log("------")
|
|||
|
|
console.log(props)
|
|||
|
|
}
|
|||
|
|
render(){
|
|||
|
|
return (
|
|||
|
|
<div>
|
|||
|
|
<li>B</li>
|
|||
|
|
<li>接收到的值：{this.props.carName}</li>
|
|||
|
|
</div>
|
|||
|
|
)
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
ReactDOM.render(
|
|||
|
|
// <Count/>,document.getElementById('app')
|
|||
|
|
<A/>,document.getElementById('app')
|
|||
|
|
)
|
|||
|
|
</script>
|
|||
|
|
</body>
|
|||
|
|
</html>
|