WebAPI 后台设置允许跨域

1，使用Nuget搜索“Microsoft.AspNet.WebApi.Cors”，安装

2，在App_Start/WebApiConfig.cs中添加跨域

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public static class WebApiConfig     {         public static void Register(HttpConfiguration config)         {             // Web API 配置和服务             //跨域配置             config.EnableCors(new EnableCorsAttribute("*", "*", "*"));             // Web API 路由             config.MapHttpAttributeRoutes();               config.Routes.MapHttpRoute(                 name: "DefaultApi",                 routeTemplate: "api/{controller}/{action}/{id}",                 defaults: new { id = RouteParameter.Optional }             );         }     }