CSS3 示例：http://www.w3school.com.cn/cssref/pr_keyframes.asp
以下是代码：
<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:red;
position:relative;
-webkit-animation:mymove 5s; /* 不支持IE */
animation:mymove 5s; /* 支持IE */
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
0% {top:0px;}
20% {top:200px;}
40% {top:100px;}
60% {top:200px;}
80% {top:150px;}
100% {top:200px;}
}
@keyframes mymove
{
0% {top:0px;}
20% {top:200px;}
40% {top:100px;}
60% {top:200px;}
80% {top:150px;}
100% {top:200px;}
}
</style>
</head>
<body>
<div></div>
</body>
</html>