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1.Web服务

        [WebMethod]
        public string webServiceTest(string userID)
        {
            return userID;
        }

2. 调用方法

RequestByGet("http://www.xxx.com/webService.asmx/webServiceTest?userID=leochu2008",null);

3. 脚本函数

function RequestByGet(url,data)
        {
            var xmlhttp;
            try
            {
                xmlhttp= new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(e)
            {
                try
                {
                    xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
                }
                catch(E)
                {
                    xmlhttp=null;
                }
            }
            if(!xmlhttp&&typeof(XMLHttpRequest)!=="undefined")
            {
                xmlhttp=new XMLHttpRequest();
            }
            xmlhttp.Open("GET",url, false);
            xmlhttp.Send(data);
            var result = xmlhttp.status;
            if(result==200)
            {
                document.write(xmlhttp.responseText);
            }
            xmlhttp = null;
        }
       
        function RequestByPost(url,value)
        {
            var xmlhttp;
            try{
                xmlhttp= new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(e)
            {
                try
                {
                  xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
                }
                catch(E)
                {
                   xmlhttp=null;
                }
            }
            if(!xmlhttp&&typeof(XMLHttpRequest)!=="undefined")
            {
                xmlhttp=new XMLHttpRequest();
            }
            xmlhttp.Open("POST",url, false);
            xmlhttp.SetRequestHeader ("Content-Type","text/xml; charset=gb2312");
            xmlhttp.Send(data);
            document.write( xmlhttp.responseText);
        }

如果调用不成功或提示“因 URL 意外地以xxx结束，请求格式无法识别”，要在webservice的 <system.web> 节点下加入
        <webServices>
          <protocols>
              <add   name= "HttpPost "   />
              <add   name= "HttpGet "   />
          </protocols>
</webServices>