<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
/* Safari、Chrome 和 Opera */
-webkit-animation:mymove 5s infinite;
}
@keyframes mymove
{
from {left:0px;}
to {left:200px;}
}
/* Safari、Chrome 和 Opera */
@-webkit-keyframes mymove
{
from {left:0px;}
to {left:200px;}
}
</style>
</head>
<body>
<p>点击“尝试一下”按钮，反转动画的方向。</p>
<button onclick="myFunction()">尝试一下</button>
<script>
function myFunction()
{
document.getElementById("myDIV").style.animationDirection = "reverse";
// 针对 Chrome、Safari 和 Opera 的代码
document.getElementById("myDIV").style.WebkitAnimationDirection = "reverse";
}
</script>
<p><strong>注意：</strong>只有 Firefox 支持 animationDirection 属性。</p>
<div id="myDIV"></div>
</body>
</html>