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                  var url="userRegistAction.do?method=check&userName="+par.value;
xmlhttp.open("POST",url,false); //´´½¨³É¹¦!
xmlhttp.onReadyStateChange = getResult;
xmlhttp.error=function(xmlhttp){alert(xmlhttp.responseText);}
xmlhttp.send(null);

            function getResult(){  //´¦Àí״̬±ä»¯µÄ´úÂë
  alert(xmlhttp.readyState);
if(xmlhttp.readyState ==4 && xmlhttp.status == 200){
alert(xmlhttp.responseText);
}
else
{
alert("wrong");
msg="״̬Âë´íÎó!!";
showMsg(par,tag,msg);
}
}
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                                    PrintWriter out=response.getWriter();
out.print(" <html> <body>nothing </body> </html>");
out.flush();
out.close();
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struts2 Ò³ÃæÉÏ ajax responseText ·µ»Ø¿Õ

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C# code:

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