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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>Hello State</title>
<script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
class Clock extends React.Component {
constructor(props) {
super(props);
this.state = {
date: new Date()
};
}
componentDidMount() {
this.timerID = setInterval(() => this.tick(), 1000);
}
componentWillUnmount() {
clearInterval(this.timerID);
}
tick() {
this.setState({
date: new Date()
})
}
render() {
return (
<div>
<h1>Hello, React!</h1>
<h2>现在是北京时间:{this.state.date.toLocaleTimeString()}</h2>
</div>
)
}
}
ReactDOM.render(
<Clock />,
document.getElementById('root')
)
</script>
</body>
</html>
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