01 | 
.img { display:block; position: relative; width:800px; height:450px; margin:0 auto;} | 
02 | 
.img:before { content: ""; position: absolute; width:200px; height: 100%; top: 0; left:-150px; overflow: hidden; | 
03 | 
background: -moz-linear-gradient(left, rgba(255,255,255,0)0, rgba(255,255,255,.2)50%, rgba(255,255,255,0)100%); | 
04 | 
background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(255,255,255,0)), color-stop(50%, rgba(255,255,255,.2)), color-stop(100%, rgba(255,255,255,0))); | 
05 | 
background: -webkit-linear-gradient(left, rgba(255,255,255,0)0, rgba(255,255,255,.2)50%, rgba(255,255,255,0)100%); | 
06 | 
background: -o-linear-gradient(left, rgba(255,255,255,0)0, rgba(255,255,255,.2)50%, rgba(255,255,255,0)100%); | 
07 | 
-webkit-transform: skewX(-25deg); | 
08 | 
-moz-transform: skewX(-25deg) | 
09 | 
} | 
10 | 
.img:hover:before { left: 150%; transition: left 1s ease 0s; } | 
01 | 
<a href="#" class="img"><img src="http://img.loveqiao.com/pic1.jpg" width="800"></a> | 
原文:http://www.cnblogs.com/xfdmb/p/6004742.html