alice|中间件串联
//如果不使用这个包,应该这样写 app = Middleware1(Middleware2(Middleware3(app))) // alice.New(Middleware1,Middleware2,Middleware3).Then(app)
//如果不使用这个包,应该这样写 app = Middleware1(Middleware2(Middleware3(app))) // alice.New(Middleware1,Middleware2,Middleware3).Then(app)