Mac 自身版本是2.x 查看ruby版本号 打开终端 ruby -v
1.brew update
如果报错 这时候brew更新出问题了
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
error: RPC failed; curl 18 HTTP/2 stream 3 was reset
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
Error: Fetching /usr/local/Homebrew failed!
Fetching /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core failed!
这是git 错误 终端执行 我看网上说这是git错误 所以我根据网上继续增加git的大小
git config http.postBuffer 204288000 （这个大小根据自己需求来）
2.继续执行 brew update 还是报错通第一步一样的错误
git config --list 可以看 上面的大小是否设置成功
3. git clone git://mirrors.ustc.edu.cn/homebrew-core.git/ /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core --depth=1
fatal: destination path '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core' already exists and is not an empty directory.
4 .cd "$(brew --repo)"
5.git remote set-url origin https://mirrors.ustc.edu.cn/brew.git
cool_mac@videozudabaoji Homebrew % cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
cool_mac@videozudabaoji homebrew-core % git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
6. brew update （终于成功了）下图所有命令
7 homebrew-core % brew -v 发现是最新的了
8.继续执行 brew install ruby
注意如果是mac 13系统以上是配置在这两个文件里面 随便一个就行 如果bash_profile配置了有就删掉
9.echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.bash_profile
10.source ~/.bash_profile