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AJAX DWR

ʹÓÃԭʼµÄXMLHttpRequest·¢³öÇëÇóʱ,Ö»ÄܶÔServletºÍJSP²Ù×÷
ÔÚJSPÖд´½¨3¸öfunction
1.createXmlHttpRequest----¸ºÔðÅжÏä¯ÀÀÆ÷ÀàÐÍ´´½¨ XMLHttpRequest¶ÔÏó
 var xmlHttpRequest;
 function createXMLHttpRequest(){
   // IE ä¯ÀÀÆ÷
   if(window.ActiveXObject){
          return new ActiveXObject("Microsoft.XMLHTTP");
      }else if(window.XMLHttpRequest){
       // ·ÇIEä¯ÀÀÆ÷
          return new XMLHttpRequest();
      }
   
  }
2.doLogin------¸ºÔð¸ü¼Ó´´½¨ºÃµÄXMLHttpRequest¶ÔÏó·¢³öÇëÇó
 function doLogin(obj){
   var url = "servlet/LoginServlet?userName="+obj.value;
   
   // 1. ´´½¨XMLHttpRequest×é¼þ
   xmlHttpRequest = createXMLHttpRequest();
   // 2. ÉèÖûص÷º¯Êý
   xmlHttpRequest.onreadystatechange = haoLeJiaoWo;
   // 3. ³õʼ»¯XMLHttpRequest×é¼þ
   // ʹÓÃget·½·¨µ÷ÓÃURL,true´ú±íÊÇÒì²½µÄ
   xmlHttpRequest.open("GET",url,true);
   // 4. ·¢ËÍÇëÇó
   xmlHttpRequest.send(null);
   alert("123");
   
  }
3.haolejiaowo---¸ºÔð½øÐлص÷´¦Àí
function haoLeJiaoWo(){
   // readyState-- =4±íʾµÃµ½ÁË·µ»Ø½á¹û
   // status=200 ±íʾ³É¹¦¶øÇÒ²»³ö´í
   /*
    ÇëÇó״̬£º
    0 -- δ³õʼ»¯
    1 -- ³õʼ»¯
    2 -- ·¢ËÍÇëÇó
    3 -- ¿ªÊ¼½ÓÊܽá¹û
    4 -- ½ÓÊܽá¹ûÍê±Ï
    Ã¿´Î״̬¸Ä±ä¶¼»áµ÷Õâ¸öº¯Êý
    
   */
   if(     xmlHttpRequest.readyState == 4   &


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using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Web.Script.Services;
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    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
    <asp:updatepanel ID="UP" runat="server">
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