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生命周期定时器.html
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生命周期定时器.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state</title>
<script src="./js/react.js"></script>
<script src="./js/react-dom.js"></script>
<script src="./js/browser.js"></script>
<script type="text/babel">
class Comp extends React.Component{
constructor(props) {
super(props);
this.state = {date: new Date()}
}
componentDidMount() {
this.sId = setInterval(() => this.tick(), 1000)
}
componentWillUnmount() {
clearInterval(this.sId);
}
tick() {
this.setState({date: new Date()})
}
render() {
return <div>
<h1>Hello, world!</h1>
<h2>It is {this.state.date.toLocaleString()}.</h2>
</div>
}
}
ReactDOM.render(
<Comp/>,
document.getElementById('div1')
)
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>