我在运行 rails server 命令时遇到此错误，请告诉我如何解决这个问题？ [复制]答案

【问题标题】：i am getting this error while running rails server command,please tell me how can i solve this? [duplicate]我在运行 rails server 命令时遇到此错误，请告诉我如何解决这个问题？ [复制]
【发布时间】：2015-02-17 00:56:00
【问题描述】：

C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/execjs-2.2.2/lib/execjs/run
times.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://gi
thub.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUn
available)
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/execjs-2.2.2/l
ib/execjs.rb:5:in `<module:ExecJS>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/execjs-2.2.2/l
ib/execjs.rb:4:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/uglifier-2.6.0
/lib/uglifier.rb:3:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/uglifier-2.6.0
/lib/uglifier.rb:3:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:72:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:72:in `block (2 levels) in require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:70:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:70:in `block in require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:59:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:59:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler.rb:132:in `require'
        from c:/Sites/project/railgirl/config/application.rb:7:in `<top (require
d)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:76:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:76:in `block in <top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:73:in `tap'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:73:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

【问题讨论】：

当您使用Windows时，请检查此answer。

标签： ruby-on-rails

【解决方案1】：

如果您想快速设置它（无需担心 gem 代码大小等），请将其放入您的 Gemfile：

gem 'therubyracer'

然后运行

bundle install

【讨论】：

【解决方案2】：

那是因为您没有在 Windows 上安装 Javascript Runtime。这是 ExecJS、TheRubyRacer 等所需的。

除非您有 JS 运行时，否则这些 gem 将无法在 Windows 上正确编译。我建议使用 gem therubyracer 并在 Windows 上安装 GoogleV8 Javascript 引擎：

https://developers.google.com/v8/build

您需要自己编译它并使其在您的 PATH 中可用。

【讨论】：

【解决方案3】：

放入你的gemfile

gem 'therubyracer'，平台：:ruby

【讨论】：