Use include, like this:

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  include ApplicationHelper

  layout false
end

@flowerwrong 谢谢，我用了 included 一直没发现……

可以在 contoller 中用 view_context 对象来访问所有的 helper 方法

#1 楼 @flowerwrong 您好，我想问下在 controller 中 include Helper 方法之后，直接调用方法名就行了么？不用实例化？