• 解决办法：
• 换源

官方安装代码不好用，总是禁止访问

1. 翻墙
2. dns污染，用switchhosts软件，把ip和域名对应 别人的仓库 换清华源 新问题：git仓库迭代树有问题

   解决办法：

   问题描述：Everything you've posted suggests that you're actually overwriting an existing install that has a b0rken core tap. That's unnecessary, since the following is less disruptive:
   rm -fr $(brew --repo homebrew/core)  # because you can't `brew untap homebrew/core`
   brew tap homebrew/core
   

换源

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