CSS3 animation 动画效果
使用CSS3 的animation属性做动态效果，减少JS代码的开发，例子如下：
<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:red;
position:relative;
/* 使用myfirst效果，持续时间是5秒，按照infinite(匀速)渐变 */
animation:myfirst 5s infinite;
/* 检索或设置对象动画在循环中反向运动 */
animation-direction:alternate;
/* Safari and Chrome */
-webkit-animation:myfirst 5s infinite;
-webkit-animation-direction:alternate;
}
/** 定义了一个效果名称，分成了5步，每步都标明了不同的状态 */
@keyframes myfirst
{
0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;}
50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}
@-webkit-keyframes myfirst /* Safari and Chrome */
{
0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;}
50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}
</style>
</head>
<body>
<p><strong>注释：</strong>Internet Explorer 9 以及更早的版本不支持 animation-direction 属性。</p>
<div></div>
</body>
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