[ServiceContract]
    public interface IAPI
    {
        /// <summary>
        /// 登录
        /// </summary>
        /// <param name="UserName">用户名</param>
        /// <param name="Password">密码</param>
        /// <returns></returns>
        [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
    {

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

<!--wcf rest 配置开始-->
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
  </system.webServer>
  <system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
    <standardEndpoints>
      <webHttpEndpoint>
        <!--编写REST的时候使用的配置-->
        <standardEndpoint name="" helpEnabled="true" automaticFormatSelectionEnabled="true"/>
        <!--helpEnabled 是否开启帮助 automaticFormatSelectionEnabled 是否启动自动格式-->
      </webHttpEndpoint>
    </standardEndpoints>
  </system.serviceModel>
  <!--wcf rest 配置结束-->

$(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);
                }
            });

        });