<!DOCTYPE html>
<html>
<head>
<meat charset="UTF-8">
<title>2_不用函数柯里化的实现</title>
</head>
<body>
<!-- 准备好一个容器 -->
<div id="test"></div>
<!-- 核心库 -->
<script type="text/javascript" src="../js/react.development.js"></script>
<!-- react-dom,操作dom -->
<script type="text/javascript" src="../js/react-dom.development.js"></script>
<!-- 引入babel，jsx转为js -->
<script type="text/javascript" src="../js/babel.min.js"></script>
<!-- 此处一定要写babel -->
<script type="text/babel">
//1.创建组件
//生命周期回调函数 <=>生命周期钩子函数 <=>生命周期函数 <=>生命周期钩子 等等即生命周期
class Life extends React.Component{
state = {opacity:1}
death =()=>{
//卸载组件
ReactDOM.unmountComponentAtNode(document.getElementById('test'))
}
//组件挂载完毕
componentDidMount(){
this.timer = setInterval(() => {
//获取原状态
let { opacity } = this.state
//减小0.1
opacity -= 0.1
if (opacity <= 0) opacity = 1
//设置新的透明度
this.setState({ opacity })
}, 200);
}
//组件将要卸载
componentWillUnmount(){
//清除定时器
clearInterval(this.timer)
}
//初始化渲染、状态更新之后
render(){
console.log('render')
return(
<div>
<h2 style={{opacity:this.state.opacity}}>React学不会怎么办？</h2>
<button onClick={this.death}>不活了</button>
</div>
)
}
}
//2.渲染组件到页面
ReactDOM.render(<Life/>, document.getElementById("test"));
</script>
</body>
</html>
==============
