rails3

下载ruby
1) Download Ruby 1.9.3-p0
下载DevKit
2) Download DevKit file from http://rubyinstaller.org/downloads (DevKit-tdm-32-4.5.2-20110712-1620-sfx.exe)

3) Extract DevKit to path C:\Ruby193\DevKit

添加环境变量
RUBY_HOME = C:\Ruby193
Path 追加 %RUBY_HOME%\bin

4) cd C:\Ruby192\DevKit

5) ruby dk.rb init

6) ruby dk.rb review

7) ruby dk.rb install

8) gem install rails

9) rails new [your project name]