通过javascript和html5调用C#WCF json服务

我很难从javascript调用WCF服务（json）。这是我为从数据库获取数据而创建的一个简单服务。用户应该能够从HTML5网站提供用户名和密码，点击提交按钮，服务应该被调用

这是服务接口

[ServiceContract]
    public interface IService1
    {
        [OperationContract]
        [WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/getLogin", BodyStyle = WebMessageBodyStyle.WrappedRequest)]
        int getLogin(string username, string password);

这就是服务方法

public int getLogin(string username, string password)
    {
        var conString = ConfigurationManager.AppSettings.Get("MyDBConnectionStrings");
        var sqlConn = new SqlConnection(conString);           
        var restID = 0;
        var user_name = "";
        var pass_word = "";

        try
        {
            sqlConn.Open();
            var query = "select * from Restaurant where businesscode = '" + username + "' and password = '" + password + "'";
            var createCommand = new SqlCommand(query, sqlConn);

            createCommand.ExecuteNonQuery();
            var dr = createCommand.ExecuteReader();

            if (dr.Read())
            {
                user_name = dr["BusinessCode"].ToString();
                pass_word = dr["password"].ToString();
                restID = Convert.ToInt32(dr["RestuarantID"].ToString());
            }
            else
            {
                return restID;
            }
        }
        catch(Exception ex)
        {
            throw ex;
        }
        finally
        {
            sqlConn.Close();
        }
        return restID;

    }

这是我用来在点击按钮时调用服务的javascript函数

function loginService()
{
   var businesscode = document.getElementById("buscode").value; 
   var password = document.getElementById("pass").value; 

   var serviceUrl = "http://localhost:18933/Service1.svc/getLogin";

   var dataString='username=' + businesscode + '&password=' + password;

    $.ajax({
        type: "POST",
        url: serviceUrl,
        data: dataString,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (result) {
            console.log(result);
        if(result == 1)
        {
         alert("log successful");
        }
        else
        {
        alert("fail");
        }
    }


});}

---

我不知道我哪里出错了。当我点击我调用函数的submit按钮时，网站没有响应，控制台也没有显示错误。如果有人能以某种方式帮助我，那将是一个很大的帮助。谢谢..

您是否输入了请求正文？您的数据（dataString变量）不是JSON格式。