如何解决使用brew update很慢的问题

在mac上使用brew update、brew install很慢，主要原因是需要访问的网络太慢。切换国内源可以解决。
使用中科大源

# 步骤一
cd "$(brew --repo)"
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git

# 步骤二
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git

#步骤三
brew update

还原默认源

cd "$(brew --repo)"
git remote set-url origin https://github.com/Homebrew/brew.git
 
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://github.com/Homebrew/homebrew-core
 
brew update