rails s 出错解决方案

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zhudf@Linux64:~/Rails/demo$ rails s/home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/railties-4.1.0/lib/rails/app_rails_loader.rb:37: warning: Insecure world writable dir /opt/android-sdk-linux/platform-tools in PATH, mode 040777/home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:222: warning: Insecure world writable dir /opt/android-sdk-linux/platform-tools in PATH, mode 040777/home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/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/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/execjs-2.0.2/lib/execjs.rb:5:in `<module:ExecJS>'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/execjs-2.0.2/lib/execjs.rb:4:in `<top (required)>'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/uglifier-2.5.0/lib/uglifier.rb:3:in `require'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/uglifier-2.5.0/lib/uglifier.rb:3:in `<top (required)>'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `require'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `each'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:72:in `block in require'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `each'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:61:in `require'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler.rb:132:in `require'from /home/zhudf/Rails/demo/config/application.rb:7:in `<top (required)>'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:79:in `require'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:79:in `block in server'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:76:in `tap'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:76:in `server'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:40:in `run_command!'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/railties-4.1.0/lib/rails/commands.rb:17:in `<top (required)>'from /home/zhudf/Rails/demo/bin/rails:8:in `require'from /home/zhudf/Rails/demo/bin/rails:8:in `<top (required)>'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/lib/spring/client/rails.rb:27:in `load'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/lib/spring/client/rails.rb:27:in `call'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/lib/spring/client/command.rb:7:in `call'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/lib/spring/client.rb:26:in `run'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/bin/spring:48:in `<top (required)>'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/lib/spring/binstub.rb:11:in `load'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/gems/2.1.0/gems/spring-1.1.2/lib/spring/binstub.rb:11:in `<top (required)>'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'from /home/zhudf/.rbenv/versions/2.1.1/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'from /home/zhudf/Rails/demo/bin/spring:16:in `<top (required)>'from bin/rails:3:in `load'from bin/rails:3:in `<main>'

gem install execjsgem install therubyracer

修改项目根目录下名为GemFile的文件,加入 gem 'therubyracer'.

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