<!DOCTYPE html>
<html>
<head>
<script src="../../build/react.js"></script>
<script src="../../build/react-dom.js"></script>
<script src="../../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
var Timer = React.createClass({
getInitialState : function(){
return {secondsElapsed:0};
}, tick : function(){
this.setState({secondsElapsed:this.state.secondsElapsed + 1});
}, componentDidMount : function(){
this.interval = setInterval(this.tick,1000);
}, componentWillUnmount : function(){
clearInterval(this.interval);
}, render : function(){
return (
<div>secondsElapsed:{this.state.secondsElapsed}</div>
)
},
}); ReactDOM.render(
<Timer />,
document.getElementById('example')
);
</script>
</body>
</html>