<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="example"></div>
<script type="text/javascript" src="../js/react.development.js"></script>
<script type="text/javascript" src="../js/react-dom.development.js"></script>
<script type="text/javascript" src="../js/babel.min.js"></script>
<script type="text/babel">
/*
* 需求：自定义组件
* 1.让指定的文本做显示/隐藏的动画
* 2.切换时间为2S
* 3.点击按钮从界面中移除组件页面
* */
// 创建虚拟dom
class Life extends React.Component {
constructor(props) {
super(props);
//初始化状态
this.state = {
opacity: 1
}
}
distoryComponent() {
ReactDOM.unmountComponentAtNode(document.getElementById(‘example‘));
}
componentDidMount() {
//启动循环定时器
this.IntervalId = setInterval(function () {
console.log(‘定时器执行......‘)
let {opacity} = this.state
opacity -= 0.1
if (opacity <= 0) {
opacity = 1
}
this.setState({opacity})
}.bind(this), 200)
}
componentWillUnmount() {
//清理定时器
clearInterval(this.IntervalId)
}
render() {
const {opacity} = this.state
return (
<div>
<h2 style={{opacity}}>{this.props.msg}</h2>
<button onClick={this.distoryComponent}>不活了</button>
</div>
);
}
}
// 渲染虚拟dom
ReactDOM.render(<Life msg="react太难了！"/>, document.getElementById(‘example‘))
</script>
</body>
</html>
原文地址：https://www.cnblogs.com/zhanzhuang/p/10716482.html
时间： 2024-10-28 03:28:58