Ruby 随记 -简单语法示例

#method_missing 方法

class Find

   def self.post

      puts "使用的地址是：www.baidu.com"

   end

   def self.method_missing pd

      puts "地址错误"

   end

end

Find.post

Find.pd

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鸭子类型

class MusicAvi

  def play

    puts "我能播放avi"

  end

end

class Music3gp

  def play

    puts "我能播放3gp"

  end

end

class MusicRmv

  def play

    puts "我能播放Rmv"

  end

end

class MusicRmvb

  def play

    puts "我能播放Rmvb"

  end

end

def playMusic(music)

  puts music.play

end

playMusic(Music3gp.new)

playMusic(MusicAvi.new)

playMusic(MusicRmv.new)

playMusic(MusicRmvb.new)

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Proc块 传参

def call_proc(pr)

  a = "我是call proc中的变量"

  puts a

  pr.call

end

a = "我是call proc 外的变量"

pr = Proc.new{puts a}

pr.call

call_proc(pr)

=======================================================

Ruby 异常处理

def myPro

  puts "这是我定义的mypro方法"

end

begin

  mypro "a","b"

rescue Exception=>e

  puts "程序出现异常"

  puts "#{e.backtrace}"

  puts "#{e.to_s}"

  puts "#{e.message}"

ensure puts "haha"

end