运行 Rails 服务器时，Windows 上没有 Javascript 运行时

Question

我是 Ruby on Rails 的新手，在我的 Windows PC 上设置它时遇到问题。我已成功按照http://rubyonrails.org/download 上的说明进行操作。但是，当我运行 rails server 命令时，我会得到以下输出：

C:/Ruby192/lib/ruby/gems/1.9.1/gems/execjs-1.2.9/lib/execjs/runtimes.rb:47:in `a
utodetect': Could not find a JavaScript runtime. See https://github.com/sstephen
son/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/execjs-1.2.9/lib/execjs.rb:5:in
 `<module:ExecJS>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/execjs-1.2.9/lib/execjs.rb:4:in
 `<top (required)>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/coffee-script-2.2.0/lib/coffee_
script.rb:1:in `require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/coffee-script-2.2.0/lib/coffee_
script.rb:1:in `<top (required)>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/coffee-script-2.2.0/lib/coffee-
script.rb:1:in `require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/coffee-script-2.2.0/lib/coffee-
script.rb:1:in `<top (required)>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/coffee-rails-3.1.1/lib/coffee-r
ails.rb:1:in `require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/coffee-rails-3.1.1/lib/coffee-r
ails.rb:1:in `<top (required)>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runt
ime.rb:68:in `require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runt
ime.rb:68:in `block (2 levels) in require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runt
ime.rb:66:in `each'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runt
ime.rb:66:in `block in require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runt
ime.rb:55:in `each'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler/runt
ime.rb:55:in `require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.21/lib/bundler.rb:1
22:in `require'
        from C:/RoR/tickets/config/application.rb:7:in `<top (required)>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.1.1/lib/rails/comman
ds.rb:52:in `require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.1.1/lib/rails/comman
ds.rb:52:in `block in <top (required)>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.1.1/lib/rails/comman
ds.rb:49:in `tap'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.1.1/lib/rails/comman
ds.rb:49:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'

当我访问https://github.com/sstephenson/execjs 网站时，我仍然不确定如何进行。 谁能指出我正确的方向（记住我是新手）？谢谢！

Answer 1

我也遇到过这个问题 我的解决方案就是添加

C:\Windows\System32

到PATH

然后重新启动您的计算机。

Answer 2

我通过从http://nodejs.org/（安装链接）安装 node.js 使其工作 并将其安装路径（包括 node.exe）添加到我的 windows 用户' 路径的环境变量。我还在上面提到的 windows 变量中添加了杨的回复路径。

Answer 3

这可能不是一个普遍流行的答案，但对于新用户，我会注释掉 gemfile 中加载 sass 和 coffeescript 的行。并不是说它们一点都不坏——但我认为它们给掌握框架的人增加了不必要的复杂性。或者，如果您已经熟悉这些组件，那么您只需要安装一个 javascript 运行时 - 我使用 node.js