gem,rvm,bundle 有什么区别啊？

Azon — Wed, 28 Mar 2012 23:37:03 +0800

我刚学 ruby 不久，照着例子也写过几行代码，但是很多地方还是搞不明白。也使用过 gem，rvm，bundle 这些工具，感觉上这三个工具的作用都差不多，哪位前辈可以为我解答一下它们之间的区别，以及真正的作用是什么啊？

请问到哪里能够下载到 rails 的视频教程啊

Azon — Tue, 27 Mar 2012 14:05:46 +0800

最近在看电子书，总感觉效果不好。不知道哪里才能下载到有关 rails，ruby 的视频教程，有知道的可不可以分享下地址啊？

执行 rails server 报错 Could not find a JavaScript runtime

Azon — Sun, 04 Mar 2012 20:43:47 +0800

小弟我初学 ruby，今天部署 rails 环境。在 debian 系统上，通过 rvm 安装的 ruby，rails，bundle。使用 rails new demo 命令创建了一个名字为 demo 的项目，然后在 demo/script 目录下执行 rails server 命令，结果打印出了一堆错误信息。错误信息如下：

/home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/execjs-1.3.0/lib/execjs/runtimes.rb:50:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/execjs-1.3.0/lib/execjs.rb:5
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/coffee-script-2.2.0/lib/coffee_script.rb:1
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/coffee-script-2.2.0/lib/coffee-script.rb:1
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/bundler-1.0.22/lib/bundler/runtime.rb:68:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/bundler-1.0.22/lib/bundler/runtime.rb:68:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/bundler-1.0.22/lib/bundler/runtime.rb:66:in `each'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/bundler-1.0.22/lib/bundler/runtime.rb:66:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/bundler-1.0.22/lib/bundler/runtime.rb:55:in `each'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/bundler-1.0.22/lib/bundler/runtime.rb:55:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/bundler-1.0.22/lib/bundler.rb:122:in `require'
    from /home/xudong/ruby/work/demo/config/application.rb:7
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/railties-3.2.2/lib/rails/commands.rb:53:in `require'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/railties-3.2.2/lib/rails/commands.rb:53
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/railties-3.2.2/lib/rails/commands.rb:50:in `tap'
    from /home/xudong/.rvm/gems/ruby-1.8.7-p358/gems/railties-3.2.2/lib/rails/commands.rb:50
    from script/rails:6:in `require'
    from script/rails:6

在 google 上搜了一天了，有相同问题的不少，但是能解决的没有。麻烦知道解决方案的高手们，给指点一下啊。

Azon (Azon Wan)

gem,rvm,bundle 有什么区别啊？

请问到哪里能够下载到 rails 的视频教程啊

执行 rails server 报错 Could not find a JavaScript runtime