<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
</head>
<body>
<style>
* {
margin: 0;
padding: 0;
}
span {
display: block;
width: 30px;
height: 30px;
padding-left: 30px;
background-image: url(http://images.cnitblog.com/blog/294743/201304/21141707-77236dc5976d4f7db624bf3a5d2eee28.gif);
background-repeat: no-repeat;
background-position: 0 -3px;
}
span span span span span {
padding-left: 0;
}
span:hover {
background-position: 0 -31px;
}
</style>
<span>
<span>
<span>
<span>
<span></span>
</span>
</span>
</span>
</span>
</body>
</html>
效果如下
