mux：github.com/gorilla/mux

func RegisterWebRoutes(r *mux.Router) {

    .
    .
    .

    // 静态资源
    r.PathPrefix("/css/").Handler(http.FileServer(http.Dir("./public")))
    r.PathPrefix("/js/").Handler(http.FileServer(http.Dir("./public")))

    // 中间件：强制内容类型为 HTML
    r.Use(middlewares.ForceHTML)
}