MVC的路由包括以下几部分

路由名称，路由URL,路由的初始值，路由的约束，路由的命名空间

routes.MapRoute(

            name: "Default",

            url: "{controller}/{action}/{id}",

            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },

            constraints: new { controller = "^H.*" },

            namespaces: new[] { "SimpleMVC" }

        );// 断点2