<system.webServer>

    <modules runAllManagedModulesForAllRequests="true" />

  </system.webServer>

            routes.MapRoute(

                name: "Default",

                url: "{controller}/{action}.html",

                defaults: new { controller = "Home", action = "Index" }

            );

home/index.html?page=1

home/index/1.html  (这种写法无法自定义参数名称，只能使用路由里配置的参数名称)

        public ActionResult Welcome(int? page)

        {

            ViewBag.Message = "第"+page+"页";

            return View();

        }

        public ActionResult Welcome(int page=1)

        {

            ViewBag.Message = "第"+page+"页";

            return View();

        }