homebrew是Mac上常用的软件包管理工具，通过官网上的指导使用以下命令安装：
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
结果是失败，
curl: (7) Failed to connect to raw.githubusercontent.com port 443: Connection refused
最终在知乎上找到一个镜像网站https://www.jsdelivr.com/，安装改为以下
ruby -e "$(curl -fsSL https://cdn.jsdelivr.net/gh/ineo6/homebrew-install/install)"
进度条就开始蹭蹭动了，后面在执行Tapping homebrew时卡住了：
==> Tapping homebrew/core
Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core'...
中止Tapping后，进入上述homebrew目录手动执行git clone
cd /usr/local/Homebrew/Library/Taps/
mkdir homebrew ##if homebrew doesn't exist
git clone git://mirrors.ustc.edu.cn/homebrew-core.git
git clone成功后重新执行上一条安装命令。
原文链接：https://zhuanlan.zhihu.com/p/90508170