asp.net 页面延迟加载内容

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="test8_Default3" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
    .con{ position: absolute;width:50%;height:50%;background-color:silver;left:0px;top:0px}
    </style>
 
</head>
<body>
    <!--请用CSS控制下边的DIV是全屏状态--> 
    <div id="loading" class="con">页面加载中</div>
    <form id="form1" runat="server" style="display:none">

            显示!!
    </form>
</body>
</html>

<script type="text/javascript">
    setTimeout("showDiv()",3000);//延迟3秒

    function showDiv() {
        document.getElementById("loading").style.display = "none";
        document.getElementById("form1").style.display = "block"; //显示表单
    }
</script> 



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