执行rspec：install时出现Rails 4 / Ruby 2.0错误

Question

我正在跟踪Internet上的ruby on rails 4教程。 我执行了命令rails generate rspec:install并且得到了这个

rails generate rspec:install

/home/arman/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.1/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/arman/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.1/lib/execjs.rb:5:in `<module:ExecJS>'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.1/lib/execjs.rb:4:in `<top (required)>'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.1.1/lib/uglifier.rb:3:in `require'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.1.1/lib/uglifier.rb:3:in `<top (required)>'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247@global/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
    from /home/arman/rails_projects/sample_app/config/application.rb:12:in `<top (required)>'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:44:in `require'
    from /home/arman/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.0/lib/rails/commands.rb:44:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

我不知道该如何解决。

操作系统：Virtualbox Ruby 2.0 Rails 4.0上的Linux Mint 15

Answer 1

让我们看看您在输出中得到了什么。

找不到JavaScript运行时。 有关可用运行时的列表，请参见https://github.com/sstephenson/execjs 。

嗯，听起来很有趣。 让我们跟随该链接。

ExecJS支持以下运行时：

• therubyracer -Ruby中嵌入的Google V8
• therubyrhino-嵌入JRuby的Mozilla Rhino
• Node.js
• Apple JavaScriptCore-包含在Mac OS X中
• Microsoft Windows脚本宿主 （JScript）

我认为您应该安装其中之一。