javascript如何在上帧中判断下帧中的页面是否已经装载完毕?

窗口内有上下两帧,上帧控制下帧的页面调出,下帧调出成功后需要从页面上读一个栏位的值,所以需要等待下帧调出成功后才能读取,但是如何判断?
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1<script language="vbscript">   
2Sub Foo()   
3If frame2.document.readyState = "complete" Then   
4'操作 frame2   
5Else   
6setTimeout("Foo()", 500, "vbscript")   
7End If   
8End Sub   
9</script>
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