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    jQuery("#chtnavi").html("ÕýÔÚ»ñÈ¡Êý¾Ý...");
    jQuery.ajax({
            url : "ajax.aspx",//ÕâÊǵØÖ·
            type : "post",//ÕâÊǻط¢·½Ê½
            data : "id="+value,//ÕâÊDzÎÊý,Èç¹ûûÓÐÔòΪ¿Õ
            dataType : "html",
            complete :
            function (http,status)
             {
                if(status=="success")
                {
                   jQuery("#chtnavi").html(http.responseText);
                }
             }
    });
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 var url='../ajax.aspx;id='+escape(s);
  $.getJSON(url, function(data)
{
   if(data.ok==1)
  {//do something}
   else if(data.ok==2)
  {//do something}
   else
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<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode=Conditional>
<ContentTemplate>
<%=DateTime.Now %>
</ContentTemplate>
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Ajax add_pageLoaded

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
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