Question

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>'

Answer 1

如果你想快速设置它（不需要担心gem代码大小等），请将它放在你的Gemfile中：

gem 'therubyracer'

然后运行

bundle install

Answer 2

那是因为你没有在Windows上安装Javascript Runtime。对于像ExecJS，TheRubyRacer这样的东西，这是必需的。

除非你有JS Runtime，否则这些gems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

您需要自己编译并在PATH中使用它。

Answer 3

放入你的宝石文件

gem＆＃39; therubyracer＆＃39;，平台:: ruby

我在运行rails server命令时收到此错误，请告诉我如何解决这个问题？

3 个答案: