<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="http://www.w3school.com.cn/jquery/jquery.js"></script>
<style type="text/css">
.changecolor1{color:red;}
.changecolor2{color:blue;}
</style>
</head>
<body>
<script type="text/javascript">
function ChangeColor(){
$("#color1").toggleClass("changecolor1");
$("#color2").toggleClass("changecolor2");
setTimeout("ChangeColor()",1000)
}
ChangeColor();
</script>
<a href="#" style="color:green;"><p id="color1">color1</p></a>
<p id="color2">color2</p>
</body>
</html>
原文：http://www.cnblogs.com/bchome/p/7010530.html