更新 +2 小时：
我重新启动、卸载并安装了下载的 Railsinstaller 程序的新副本。
将宝石大理石拉下并安装。说安装正确。（但是，我想我在某些地方读到 gem name 就足够了， gem install name 是多余的。）
启动服务器 - 同样的问题。运行时 JS 不存在。
所以我创建了一个新的应用程序。构建经历了干净。再次安装 execjs。（正确安装）。运行'rails s'并且同样的问题仍然存在。
未找到解决方案。
我是一个绝对的新手。步骤顺序：
- 以传统方式安装 Ruby。从 Ruby 网站下载，安装，尝试使其工作。出了点问题 - BUNDLE INSTALL 说它找不到 gem 文件。
我说没问题-让我们寻找答案...
- 我将 Railsinstaller 安装为完整包。安装很顺利。我什至创建了一个名为“my_app”的新虚拟应用程序。
耶...
- 然后我使用应用程序导航到目录并在命令提示符下打了“rails s”（顺便说一句，它是以管理员身份运行的）
服务器启动（WEBrick）。我去 localhost:3000 并没有显示。我去提示并做 gem install rails 它去获取一些宝石并做更多的工作
现在，当我启动服务器时 - 它会引发一些关于 Javascript 的错误。
这是错误：
C:\Sites\my_app>rails s
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-1.3.0/lib/execjs/run
times.rb:50: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/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-1.3.0/l
ib/execjs.rb:5:in `<module:ExecJS>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-1.3.0/l
ib/execjs.rb:4:in `<top (required)>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee_script.rb:1:in `require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee-script.rb:1:in `require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-rails-3
.2.2/lib/coffee-rails.rb:1:in `require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-rails-3
.2.2/lib/coffee-rails.rb:1:in `<top (required)>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:68:in `require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:66:in `each'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:66:in `block in require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:55:in `each'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:55:in `require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler.rb:122:in `require'
from C:/Sites/my_app/config/application.rb:7:in `<top (required)>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:53:in `require'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:53:in `block in <top (required)>'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:50:in `tap'
from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
C:\Sites\my_app>
我不知道下一步该做什么。请帮忙...