功能很简单，却非常的实用，代码更加的简洁，这里就不多废话了
奉上源码：
复制代码 代码如下:
*
{
margin: 0px;
padding: 0px;
}
.dragBox
{
width: 400px;
height: 200px;
position: absolute;
top: 40%;
left: 40%;
background: #e8e8e8;
z-index: 8001;
}
.dragBox > div
{
height: 30px;
cursor: move;
background: #00ff21;
position: relative;
}
.ui-mask
{
width: 100%;
height: 100%;
background: #000;
position: absolute;
top: 0px;
z-index: 8000;
opacity: 0.4;
filter: Alpha(opacity=40);
}
test
