1.替换brew.git
cd "$(brew --repo)"
git remote set-url origin https://mirrors.ustc.edu.cn/brew.git
2.替换homebrew-core.git
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
3.替换homebrew-bottles
echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles' >> ~/.zshrc
source ~/.zshrc
4.执行更新，使之生效
brew update
brew update 执行时间可能比较长，耐心等待
