javascript实现遮罩层动态效果实例

  
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*{padding:0px;margin:0px;}
.main{
  width:100%;
  height:3000px;
}
#shade{
  position:absolute;//绝对定位在页面左上角
  top:0px;
  left:0px;
  z-index:1000;
  display:none;
  width:100%;
  height:100%;
  background:yellow;
  opacity:0.3;
}
#loginBox{
  position:absolute;
  top:260px;
  left:30%;
  z-index:2000;
  display:none; 
  width:400px;
  height:200px;
  background:red;
  border:1px solid red;
}