Ruby on rails 4 Rails服务器找不到JavaScript运行时_Ruby On Rails 4

Ruby on rails 4 Rails服务器找不到JavaScript运行时

ruby-on-rails-4

Ruby on rails 4 Rails服务器找不到JavaScript运行时,ruby-on-rails-4,Ruby On Rails 4,我得到以下错误。尝试搜索并尝试安装extjs、bundler等gems，但仍收到错误 harsha@harshamv:~/www/simple_cms$ rails s /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstep

我得到以下错误。尝试搜索并尝试安装extjs、bundler等gems，但仍收到错误

harsha@harshamv:~/www/simple_cms$ rails s
/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/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/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs.rb:5:in `<module:ExecJS>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs.rb:4:in `<top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.3.1/lib/uglifier.rb:3:in `require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.3.1/lib/uglifier.rb:3:in `<top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
    from /home/harsha/.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/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
    from /home/harsha/www/simple_cms/config/application.rb:7:in `<top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:74:in `require'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:74:in `block in <top (required)>'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:71:in `tap'
    from /home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:71:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

harsha@harshamv：~/www/simple\u cms$rails
/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs/runtimes.rb:51:在“自动检测”中：找不到JavaScript运行时。看见https://github.com/sstephenson/execjs 获取可用运行时的列表。（ExecJS:：RuntimeUnavailable）
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs.rb:5:in`'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/execjs-2.0.2/lib/execjs.rb:4:in`'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.3.1/lib/uglifier.rb:3:in'require'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/uglifier-2.3.1/lib/uglifier.rb:3:in`'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in'require'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:在“请求中的块（2个级别）”中
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in'each'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in'block in require'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in'each'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in'require'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/bundler-1.3.5/lib/bundler.rb:132:in'require'
from/home/harsha/www/simple\u cms/config/application.rb:7:in`'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:74:in'require'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:74:in'block in'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:71:in'tap'
from/home/harsha/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:71:in`'
从箱子/轨道：4:in“require”
从箱子/轨道：4:in`'

尝试安装最新的NodeJ

更多细节可以在这里找到

Ubuntu用户

 sudo yum install nodejs

我在Ubuntu 11.04上，也有类似的问题。安装Node.js修复了它

从Ubuntu 13.04 x64开始，您只需运行：

 sudo apt-get install nodejs

这将解决问题

CentOS/RedHat用户

 sudo yum install nodejs

替代溶液只需在gem文件中添加ExecJS和Ruby Racer，然后运行bundle安装

   gem 'execjs'

  gem 'therubyracer'

可能重复的