asp.net web api 如何设置允许后台跨域访问

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public static class WebApiConfig     {         public static void Register(HttpConfiguration config)         {             // Web API 配置和服务                                         // Web API 路由             config.MapHttpAttributeRoutes();               config.Formatters.Remove(config.Formatters.XmlFormatter);             //config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/plain"));             config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));             config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("multipart/form-data"));             config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/octet-stream"));             config.Routes.MapHttpRoute(                 name: "DefaultApi",                 routeTemplate: "api/{controller}/{id}",                 defaults: new { id = RouteParameter.Optional }             );                //设置cors允许跨越              config.EnableCors(new EnableCorsAttribute("*", "*", "GET, POST"));         }     }

　　用nuget 先安装Microsoft.AspNet.WebApi.Cors 引用，然后配置上面的配置