css3实现图片划过一束光闪过效果(图片光影掠过效果)

css:

.guangshu { display:block; position: relative; width:800px; height:450px; margin:0 auto;}
.guangshu:before { content: ""; position: absolute; width:200px; height: 100%; top: 0; left: -150px; overflow: hidden;
background: -moz-linear-gradient(left, rgba(255,255,255,0)0, rgba(255,255,255,.2)50%, rgba(255,255,255,0)100%);
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)));
background: -webkit-linear-gradient(left, rgba(255,255,255,0)0, rgba(255,255,255,.2)50%, rgba(255,255,255,0)100%);
background: -o-linear-gradient(left, rgba(255,255,255,0)0, rgba(255,255,255,.2)50%, rgba(255,255,255,0)100%);
-webkit-transform: skewX(-25deg);
-moz-transform: skewX(-25deg)
}

.guangshu:hover:before { left: 150%; transition: left 1s ease 0s; }

html代码：

<a href="#" class="guangshu"><img src="http://ceshi.beifangwangxiao.cn/img/1.png"></a>