css 实现蒙版效果

样式：

<style>.back {background:url(images/coupon-logo.gif) no-repeat;}.top {height:100px;background-color:#fff;filter:Alpha(Opacity=60);opacity:0.6;}</style>

html

<div class="back"><div class="top"></div></div>

关键代码

background-color:#fff;filter:Alpha(Opacity=60);opacity:0.6;