“$"是什么意思?Ruby 中的字符是什么意思? [英] What does the "$" character mean in Ruby?

问题描述

使用 Ruby on Rails 一段时间后决定查看实际源代码.从 GitHub 上获取 repo 并开始环顾四周.遇到一些我不确定它做什么或引用什么的代码.

Been playing with Ruby on Rails for awhile and decided to take a look through the actual source. Grabbed the repo from GitHub and started looking around. Came across some code that I am not sure what it does or what it references.

我在 actionmailer/test/abstract_unit.rb 中看到了这段代码

I saw this code in actionmailer/test/abstract_unit.rb

root = File.expand_path('../../..', __FILE__)
 begin
 require "#{root}/vendor/gems/environment"
 rescue LoadError
 $:.unshift("#{root}/activesupport/lib")
 $:.unshift("#{root}/actionpack/lib")
end

lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)

require 'rubygems'
require 'test/unit'

require 'action_mailer'
require 'action_mailer/test_case'

谁能告诉我 $:(又名金光闪闪")指的是什么?

Can someone tell me what the $: (a.k.a. "the bling") is referencing?

推荐答案

$:是用于查找外部文件的全局变量.

$: is the global variable used for looking up external files.

来自 http://www.zenspider.com/Languages/Ruby/QuickRef.html#18

$:通过 load 或 require 加载脚本和二进制模块的路径.

$: Load path for scripts and binary modules by load or require.

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