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  Ajax×é³É£º
1 JavaScript;
2 CSS£¨Ò³ÃæÑùʽ£©;
3 DOM£¨Ò³Ãæ¾Ö²¿¹ÜÀí£©;
4 xmlHttpRequest£¨Òì²½¶ÔÏó£©;
5 Òì²½¶ÔÏóÁ´½Ó·þÎñÆ÷;
var xmlHttp;
var xmlhttpObj = ["MSXML2.XmlHttp.5.0","MSXML2.XmlHttp.4.0","MSXML2.XmlHttp.3.0","MSXML2.XmlHttp","Microsoft.XmlHttp"];//ΪµÄÊÇie fireFox¼æÈÝ
function createXMLHttpRequest(){
if(window.ActiveXObject){
for(i=0;i<xmlhttpObj.length;i++)
{ s
xmlHttp = new ActiveXObject(xmlhttpObj[i]);
if(xmlHttp)
{
break;
}
alert(xmlhttpObj[i]);
}
}
else if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest();
}else{
alert("ÔÝʱ²»ÄÜ´´½¨XMLHttpRequest¶ÔÏó");
}
return xmlHttp?xmlHttp:false;
}
======================================================================
xmlHttp.open("GET","AjaxTest.action",true);         //"GET"´«Öµ·½·¨£¬"AjaxTest.action"Òì²½ÇëÇóµÄµØÖ·£¬true±íʾÒì²½
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xmlHttp.onreadystatechange=function(){        //·þÎñÆ÷״̬·¢Éú±ä»¯Ê±µ÷Óô˺¯Êý¡£
if(xmlHttp.readyState==4&&xmlHttp.status==200)       //ÅжÏÒì²½½»»¥ÊÇ·ñ³É¹¦
//do something
}
send()·¢ËÍ
xmlHttp.send(null);  //get·½·¨Ö»Ðèsend£¨null£© post ¾ÍÐèÒª½«´«µÄ²ÎÊýдµ½Àï³É Àý×Ó£ºxmlHttp.send(parmaters); 
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ajaxTest:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Trans


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  var xmlHttpReq = null;
if (window.XMLHttpRequest) //Mozilla ä¯ÀÀÆ÷
{
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// AJAXÀà
function AJAXRequest() {
var xmlObj = false;
var CBfunc,ObjSelf;
ObjSelf=this;
try { xmlObj=new XMLHttpRequest; }
catch(e) {
try { xmlObj=new ActiveXObject("MSXML2.XMLHTTP"); }
catch(e2) {
try { xmlObj=new ActiveXObject("Microsoft.XMLHTTP"); }
catch(e ......

MVC Json Ajax ¶þ¼¶ ¼¶Á¬

<script type="text/javascript">
$(document).ready(function() {
$("#teamName").change(function() {
$.getJSON('/team/SelectProduct', { teamName: $("#teamName").val() }, function(data) {
$("#productID").empty();


......

ASP.NET AJAX 4.0 ÖеÄÊý¾Ý°ó¶¨

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ת£ºhttp://hi.baidu.com/playkk/blog/item/9b5f99952fb4c94fd0135e0c.html
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