React学习案例十三
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React学习案例十三
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</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="example"></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, world!</h1>
<h2>现在是 this.state.date.toLocaleTimeString().</h2>
</div>
);
ReactDOM.render(
<Clock />,
document.getElementById('example')
);
</script>
</body>
</html>
<!-- <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</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="example"></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, world!</h1>
<h2>现在是 this.state.date.toLocaleTimeString().</h2>
</div>
);
ReactDOM.render(
<Clock />,
document.getElementById('example')
);
</script>
</body>
</html> -->
<!-- <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</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="example"></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, world!</h1>
<h2>现在是 this.state.date.toLocaleTimeString().</h2>
</div>
);
ReactDOM.render(
<Clock />,
document.getElementById('example')
);
</script>
</body>
</html> -->
<!-- <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</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="example"></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, world!</h1>
<h2>现在是 this.state.date.toLocaleTimeString().</h2>
</div>
);
ReactDOM.render(
<Clock />,
document.getElementById('example')
);
</script>
</body>
</html> -->
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