.shade{

width: 100%;

height: 100%;

position: absolute;

top: 0px;

left: 0px;

z-index: 5000;

background: #000;

opacity: 0.7;

}

本文出自 “素颜” 博客，请务必保留此出处http://suyanzhu.blog.51cto.com/8050189/1891128

遮罩的CSS样式