首先引用System.ServiceModel;System.ServiceModel;System.ServiceModel.Activation;命名空间

[ServiceContract]    public interface IAPI    {        /// 
        /// 登录        /// 
        /// 用户名        /// 密码        /// 
              [OperationContract(Name = "Login")]        [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json)]        GeneralResult Login(string UserName, string Password);    }

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]    public class APIForApp : IAPI    {

上面的是接口和实现代码

global

protected void Application_Start(object sender, EventArgs e)        {            RouteTable.Routes.Add(new ServiceRoute("API", new WebServiceHostFactory(), typeof(WebAdmin.API.APIForApp)));        }

webconfig

ajax调用

$(function () {            $.ajax({                type: "POST",                contentType: "application/json",                data: '{ "UserName": "111","Password":"111" }', //比如                url: "http://localhost:9800/API/Login",                dataType: 'json',                error: function (x, e) {                    console.log(x);                },                success: function (response) {                    console.log(response);                }            });        });

 注意method="动作"，动作有POST,GET等，必须大写。