ruby的super

在开始之前先复习一下其最简单的继承。

class A      #定义父类
  def a 
    p 'A a method'
  end
end

class B < A#定义子类，让类B继承类A
  def a
    p 'B a method start'
    super
    p 'B a method end'
  end
end

b = B.new
b.a

执行结果：

"B a method start"
"A a method"
"B a method end"