getJson 访问JSON在服务器上访问值是乱码，在本机上回来确实OK的，求大神指教_Web Service

getJson 访问JSON在服务器上访问值是乱码，在本机上返回确实OK的，求大神指教
前台页面

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <script src="http://shdesign.soufun.com/js/jquery-1.4.1.js" type="text/javascript"></script>
    <script type="text/javascript" language="javascript">
        var S_Fj=jQuery.noConflict();

        S_Fj(document).ready(function() {
         // var clientUrl = "http://localhost:4508/WebService.asmx/HelloWorld?jsoncallback=?";
            var clientUrl = "http://shdesign.soufun.com/huyong/m/WebService/WebService1.asmx/HelloWorld?jsoncallback=?";
            var currentCity = "哈尔滨";
            S_Fj.getJSON(
                clientUrl,
                { city: currentCity },
                function (json) {

                    S_Fj("#data").html("城市：" +json.city + "，时间：" + json.dateTime);
                }
            );
        });
        function OnSuccess(responseData) {
            S_Fj("#data").html(responseData.city);
        }
        function OnError(XMLHttpRequest, textStatus, errorThrown) {
            targetDiv = S_Fj("#data");
            if (errorThrown || textStatus == "error" || textStatus == "parsererror" || textStatus == "notmodified") {
                targetDiv.replaceWith("请求数据时发生错误！");
                return;
            }
            if (textStatus == "timeout") {
                targetDiv.replaceWith("请求数据超时！");
                return;
            }
        }
    </script>
</head>
<body>
<div id="data"></div>
</body>
</html>

访问wbservices端代码


        public void HelloWorld(string city)
        {
            string callbackMethodName = HttpContext.Current.Request.Params ?? "";
            city = string.IsNullOrEmpty(city) ? "北京" : "沈阳";
            string result = callbackMethodName + "({\"city\":" + "\"" + HttpUtility.UrlDecode(city) + "\", \"dateTime\":" + "\"" + DateTime.Now + "\"});";

            HttpContext.Current.Response.Write(result);
            HttpContext.Current.Response.End();
        }

本机上返回结果

城市：沈阳，时间：2013-12-27 11:00:46

服务器返回结果

({"city":"娌堥槼", "dateTime":"2013-12-27 11:03:04"});

请大神指教
------解决方案--------------------
HttpUtility.UrlDecode(city，Encoding.GetEncode(gb2312))

*****************************************************************************
签名档： http://feiyun0112.cnblogs.com/
------解决方案--------------------
http://www.2cto.com/kf/201211/167268.html
------解决方案--------------------