<!DOCTYPE html>
<html>
<head>
<style>
#myDIV { width: 100px;
height: 100px;
background: red;
-webkit-transition: width 2s;
transition: width 2s;
}
#myDIV:hover { width: 400px;
}
</style>
</head>
<body>
<p>将鼠标悬停在下方的 div 元素上，等待过渡效果结束。</p>
<div id="myDIV"></div>
<p><b>注意：</b>此示例不适用于 Internet Explorer 9 和更早版本。</p>
<script>
document.getElementById("myDIV").addEventListener("webkitTransitionEnd", myFunction);
document.getElementById("myDIV").addEventListener("transitionend", myFunction);
function myFunction() { this.innerHTML = "transitionend 事件发生 - 转换已经完成";
this.style.backgroundColor = "pink";
}
</script>
</body>
</html>