AJAX调用时出现 404 错误

项目结构

index.aspx的前台代码如下：

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

<!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>无标题页</title>

    <script src="js/ajax.js" type="text/javascript"></script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <input id="Button1" type="button" value="从数据库导入到DATATABLE" onclick="Diaoyong(1);" /><br />
            <br />
            <br />
            <input id="Button2" type="button" value="从DATATABLE中导出到EXCEL" onclick="Diaoyong(2);" />
            <div id="Xianshi">
            </div>          //主要代码
        </div>
    </form>
</body>
</html>

JS 代码

// JScript 文件

    var XMLHTTP;
    function createXMLHttpRequest()   //创建AJAX
    {
    if(window.ActiveXObject)
    {
    XMLHTTP=new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if(window.XMLHttpRequest)
    {
    xmlHttp=new XMLHttpRequest();
    }
    }


    function startRequest(url) //开始AJAX
    {

    createXMLHttpRequest();
    XMLHTTP.onreadystatechange=handleStateChange;
    XMLHTTP.open("GET",url,true);
    XMLHTTP.send(null);

    }

    function handleStateChange()
    {
    if(XMLHTTP.readyState==4) {
    alert(XMLHTTP.status);   //输出为404 自己没找不到URL问题
       if(XMLHTTP.status==200){
      PanduanBackZhi();
   }
    }
    }


   function PanduanBackZhi()
   {
   if(XMLHTTP.responseText=="从数据库载出")
   {
   document.getElementById('Xianshi').innerHTML="<img border=\"0\" src=\"../images/ajaxloading.gif\"><font color=#FF0000 sytle=font-weight:bold>准备从SQL导出数据,请稍等......</font>";
   document.getElementById('Button2').disabled=false;
   }

    if(XMLHTTP.responseText=="从EXCEL 导出")
   {
   document.getElementById('Xianshi').innerHTML="<img border=\"0\" src=\"../images/ajaxloading.gif\"><font color=#FF0000 sytle=font-weight:bold>准备DATATABLE导出数据,请稍等......</font>";
   document.getElementById('Button1').disabled=false;
   }
   }

   function Diaoyong(panduan)
   {
   startRequest("AJAXExcel.aspx?id="+panduan+"");
   }

希望知道的朋友能给个帮助，谢谢！

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