纯CSS实现的当鼠标移上图片添加阴影效果代码

<html> 
<head> 
<title>CSS给图片添加阴影</title> 
<style> 
*{padding:0;margin:0;} 
body{background:#E8EDF1;padding:20px;} 
#profileAvatar {overflow:hidden;zoom:1;} 
#profileAvatar i{float:left;visibility:hidden;background:url(//files.jb51.net/demoimg/200912/avatar.gif) 0 0 no-repeat;} 
#profileAvatar i i{background-position:100% 0; } 
#profileAvatar i i i{background-position:0 100%;} 
#profileAvatar i i i i{padding:0 5px 6px 0;background-position:100% 100%; } 
#profileAvatar img{visibility:visible;display:block;padding:3px;border:1px solid #ccc;background:#fff;} 
</style> 
</head> 
<body> 
                 
    <i><i><i><i> 
<img src="https://www.jb51.net/www.gxlcms.com/images/logo.gif" width="215" id="image" onmouseover="show()" onmouseout="show()" /> 
    </i></i></i></i> 
 
鼠标移上去显示圆滑的阴影

<input type="button" value="缩小图片" onclick="document.getElementById('image').width -=10;" /> 
</body> 
<script type="text/javascript"> 
    var imgBg=document.getElementById('profileAvatar').getElementsByTagName('i') 
    function show(){ 
        for(i=0;i<imgBg.length;i++) 
        {     
            if(imgBg[i].style.visibility=='visible') 
            imgBg[i].style.visibility='hidden'; 
            else 
            imgBg[i].style.visibility='visible' 
        } 
    } 
</script> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]