React之简单入门实例计时器

1、问题背景

利用React实现一个计时器的效果，改变时间为1s

2、实现源码

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>React之简单入门实例（计时器）</title>
		<link rel="stylesheet" href="css/base.css" />
		<script type="text/javascript" src="js/react.js" ></script>
		<script type="text/javascript" src="js/react-dom.js" ></script>
		<script>
			var ea = React.createClass({
		        render: function() {
		          var elapsed = Math.round(this.props.elapsed  / 100);
		          var seconds = elapsed / 10 + (elapsed % 10 ? '' : '.0' );
		          var message = '开始计时：' + seconds + ' 秒';
		
		          return React.DOM.p(null,message);
		        }
		    });
		
		    var eaf = React.createFactory(ea);
		    var startTime = new Date().getTime();
		      setInterval(function() {
		        ReactDOM.render(
		          eaf({elapsed: new Date().getTime() - startTime}),document.getElementById('timer')
		        );
		    },1000);
		</script>
	</head>
	<body>
		<div id="timer"></div>
	</body>
</html>

3、实现结果

React之简单入门实例计时器

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