没好的办法,z-index对SELECT不适用,因为SELECT是以ACTIVEX控件的方式实现的,建议,显示菜单时,把SELECT藏起来
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http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/objects/SELECT.aspThe SELECT element is available in HTML and script, as of Internet Explorer 3.0.
This element is a windowed control and does not support the z-index attribute or zIndex property.关于隐藏SELECT的建议,在此得到印证:
http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/zIndex.asp?frame=trueIf you maintain Web pages that were designed for earlier versions of Internet Explorer that do not support the zIndex property, you might want to redesign the pages, especially if the pages contain iframe objects that are stacked on top of windowed controls, such as select objects. You can use the visibility attribute to hide windowed controls that you want an iframe object to overlap. You can also position windowed controls so that iframe objects do not overlap them.