ruby on rails 报错解决

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/usr/local/ruby/lib/ruby/gems/2.1.0/gems/execjs-2.2.2/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 /usr/local/ruby/lib/ruby/gems/2.1.0/gems/execjs-2.2.2/lib/execjs.rb:5:in `<module:ExecJS>'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/execjs-2.2.2/lib/execjs.rb:4:in `<top (required)>'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/coffee-script-2.3.0/lib/coffee_script.rb:1:in `<top (required)>'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/coffee-script-2.3.0/lib/coffee-script.rb:1:in `<top (required)>'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/jekyll-coffeescript-1.0.1/lib/jekyll-coffeescript.rb:2:in `<top (required)>'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/jekyll-2.5.2/lib/jekyll/deprecator.rb:46:in `block in gracefully_require'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/jekyll-2.5.2/lib/jekyll/deprecator.rb:44:in `each'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/jekyll-2.5.2/lib/jekyll/deprecator.rb:44:in `gracefully_require'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/jekyll-2.5.2/lib/jekyll.rb:166:in `<top (required)>'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'        from /usr/local/ruby/lib/ruby/gems/2.1.0/gems/jekyll-2.5.2/bin/jekyll:6:in `<top (required)>'        from /usr/local/ruby/bin/jekyll:23:in `load'        from /usr/local/ruby/bin/jekyll:23:in `<main>'
解决 yum -y install nodejs
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