下载地址：
ruby各版本下载地址
https://rubyinstaller.org/downloads/

2.3.3版本
https://www.cr173.com/soft/14252.html

下载后安装
这里以2.7.3为例

双击安装后

回车

回车

C:\Users\Administrator>ruby -v
ruby 2.7.3p183 (2021-04-05 revision 6847ee089d) [x64-mingw32]

Z:\F\site\go\src\ruby\fofapro>gem -v
3.1.6


#报错没添加源
C:\Users\Administrator>gem install bundler
ERROR:  Could not find a valid gem 'bundler' (>= 0) in any repository

# 报没有证书的错
C:\Users\Administrator>gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
Error fetching https://gems.ruby-china.com/:
        SSL_connect returned=1 errno=0 state=error: certificate verify failed (https://gems.ruby-china.com/specs.4.8.gz)

C:\Users\Administrator>gem sources -l
*** CURRENT SOURCES ***

报上面的错误没有证书，参照下面的连接解决
https://www.pianshen.com/article/67147583/

C:\Users\Administrator>gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
https://gems.ruby-china.com/ added to sources
source https://rubygems.org/ not present in cache


C:\Users\Administrator>gem sources -l
*** CURRENT SOURCES ***

https://gems.ruby-china.com/

C:\Users\Administrator>gem install bundler
Fetching: bundler-2.2.17.gem (100%)
Successfully installed bundler-2.2.17
Parsing documentation for bundler-2.2.17
Installing ri documentation for bundler-2.2.17
Done installing documentation for bundler after 33 seconds
1 gem installed

C:\Users\Administrator>gem install rails -v 5.0.0