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$("#覆盖层的id").parent().appendTo("body");
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1"
DisplayAfter="1">
<ProgressTemplate>
<div style="background:#99CCFF;filter:Alpha(opacity=60);position: fixed;_position:absolute;width:100%;height:100%;" id="b"></div>
<div style="
position: fixed;
_position:absolute;
top: 40%;
left: 45%;
width: 100px;
height: 50px;
border: 16px solid #FFF;
border-bottom:none;
background-color: white;
z-index:1002;
overflow: auto;
text-align:center;
" id="a">[ 正在查询... ]</div>
</ProgressTemplate>
</asp:UpdateProgress>