本文记录了在使用Rails过程中遇到的服务器错误，详细介绍了错误信息：无法找到JavaScript运行时，并提供了可能的解决方案，包括安装多种Gem以尝试解决问题。
>rails server
error message:
/usr/local/ruby1.9.2/lib/ruby/gems/1.9.1/gems/execjs-1.2.4/lib/execjs/runtimes.rb:45:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
>sudo gem install rake
>sudo gem install rack
>sudo gem install fastthread
>sudo gem install execjs
>sudo gem install therubyracer
>sudo gem install --no-ri --no-rdoc therubyracer
error message:
/usr/local/ruby1.9.2/lib/ruby/gems/1.9.1/gems/execjs-1.2.4/lib/execjs/runtimes.rb:45:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
>sudo gem install rake
>sudo gem install rack
>sudo gem install fastthread
>sudo gem install execjs
>sudo gem install therubyracer
>sudo gem install --no-ri --no-rdoc therubyracer
>sudo gem install libv8
install node
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