//替换 brew-git

$ cd "$(brew --repo)"

$ git remote set-url origin https://mirrors.ustc.edu.cn/brew.git

//替换homebrew-core.git

$ cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"

$ git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git

//替换homebrew-cask

$ cd "$(brew --repo)"/Library/Taps/homebrew/homebrew-cask

$ git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-cask.git

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解决 MAC 上 brew update 更新缓慢甚至卡死状态