Bug描述： SELECT elements ignore Z-index ("windowed element" problem)
連接：http://www.throbs.net/web/articles/IE-SELECT-bugs/#ieZIndex
問題原因：
1. select html標記在IE6下的解析不管Z-index
2. div 不能遮蓋select,
解決思路:
1. 在select上用iframe遮蓋
2. 在iframe上用div遮蓋
3. iframe的width,height,top,left與div一樣大.
示例代碼
#zindexDiv{
position:absolute;
z-index:50;
width:expression(this.nextSibling.offsetWidth);
height:expression(this.nextSibling.offsetHeight);
top:expression(this.nextSibling.offsetTop);
left:expression(this.nextSibling.offsetLeft);
/*background-color:green;?ff????????,????????????????*/
}
#divUp{
z-index:99;
position:absolute;
background-color:red;
width:100;
height:18;
overflow:hidden;
height:60px;
}
#ddlTest{
width:200;
z-index:1;
}
</style>
<body>
<iframe id="zindexDiv" frameborder="0"></iframe>
<div id="divUp">aaaaaaa<br>bbbbbbb<br>ccccccc</div>