<!DOCTYPE html>
<html>
<head>
<style>
div { width: 100px;
height: 100px;
background: red;
position: relative;
animation: mymove 5s infinite;
}
@keyframes mymove { from {left: 0px;} to {left: 200px;}}
</style>
</head>
<body>
<h1>使用 JavaScript 更改动画方向</h1>
<p>单击“试一试”按钮可反转动画的方向。</p>
<button onclick="myFunction()">试一试</button>
<div id="myDIV"></div>
<script>
function myFunction() { document.getElementById("myDIV").style.animationDirection = "reverse";}
</script>
<p><strong>注意：</strong> Internet Explorer 11 及更早版本不支持 animationDirection 属性。</p>
</body>
</html>