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<head runat="server">
<title>无标题页</title>
<script type="text/javascript">
function showFrame()
{
var fB = document.getElementById("frameB");
fB .style.display = "block";// 显示
}
</script>
</head>
<body>
<form id="form1" runat="server">
<iframe id="frameA" src="A.aspx"></iframe>
<iframe id="frameB" src="B.aspx" style="display:none;"></iframe>
</form>
</body>
<form id="form1" runat="server">
AAAAAA
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="parent.showFrame()" />
</form>
<form id="form1" runat="server">
BBBBBB
</form>