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JScript code:

//´´½¨Ò»¸öajax·ÃÎʶÔÏó
function Ajax(){
this.url = "";//ÒªÇëÇóµÄÍøÒ³µØÖ·
this.method = "";//ÒªÇëÇóµÄÀàÐÍ
this.xRequest = null;//ÉùÃ÷Ò»¸öXMLHttpRequestä¯ÀÀÆ÷ÄÚÖÃÇëÇó¶ÔÏó
this.success = null;//ÇëÇó³É¹¦Òª´¦ÀíµÄº¯Êý
this.failure = null;//ÇëÇóʧ°ÜÒª´¦ÀíµÄº¯Êý
this.params = null;//ÇëÇóʱҪ´«µÝµÄ²ÎÊý


//´´½¨ÇëÇó¶ÔÏó
this.CreateXmlHttpRequest = function(){
try{
//´´½¨¾É°æ±¾µÄIEÇëÇó¶ÔÏó
this.xRequest = new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
try{
if(window.XmlHttpRequest){
//´´½¨Ð°汾IEÇëÇó¶ÔÏó
this.xRequest = new XMLHttpRequest();
}else if(typeof ActiveXOject != "undefined"){
//´´½¨com×齨
this.xRequest = new ActiveXObject("Microsoft.XMLHTTP");


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C# code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="tttt.aspx.cs" Inherits="tttt" %>
<%@ Register Assembly="System.W ......

AJAX+ASP·µ»ØÖµÎÊÌâ

<%Response.ContentType="text/xml"
response.write "<ÕâÀïÊäÈë×Öĸ¾ÍÕý³£/>"
response.write "<999/>" Êý×ÖÔòÏÔʾ Ñùʽ±íÎÞ·¨²é¿´ XML ÊäÈë
%>
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asp.net Ajax ¶¯Ì¬Éú³Édropdownlist

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