当我在新项目上尝试命令rails server时，我收到此错误
我正在运行Debian 7.我正在使用RVM。 我也在运行mySQL。 我是ruby的新手以及rails。 如果我看起来很天真，请原谅我。
我设置了一个项目：
rails new projectname -d mysql
然后我进入该目录并运行：
rails server
然后我得到这个错误：
/home/user/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.0/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable) from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.0/lib/execjs.rb:5:in `' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.0/lib/execjs.rb:4:in `' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler.rb:132:in `require' from /home/user/htdocs/simple_cms/config/application.rb:7:in `' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.14/lib/rails/commands.rb:53:in `require' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.14/lib/rails/commands.rb:53:in `block in ' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.14/lib/rails/commands.rb:50:in `tap' from /home/user/.rvm/gems/ruby-2.0.0-p247/gems/railties-3.2.14/lib/rails/commands.rb:50:in `' from script/rails:6:in `require' from script/rails:6:in `'
我去了提供的链接： https ： //github.com/sstephenson/execjs
安装下的自述文件说：
gem install execjs
我这样做仍然得到同样的错误。 我搞不清楚了。
您必须首先安装Javascript运行时 ，例如Node.js。
对于Debian， Node.js Github上有安装说明
编辑： ExecJS README列出了支持的Javascript运行时。
我确实安装了therubyracer。 我把必要的gem放在项目的gem文件中。 这似乎解决了这个问题。