1. brew
参考：https://www.cnblogs.com/zoulifeng2017/p/7514139.html
Homebrew官网 http://brew.sh/index_zh-cn.html
运行命令：/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew用法简要说明：
brew update 更新brew；
brew install {应用名，如git} 安装软件
brew cask install {应用名，如git} 也是下载安装，与上面的区别，请查看https://www.zhihu.com/question/22624898
更多用法请 brew help
但是在安装brew是出现错误：
remote: Counting objects: 97646, done.
remote: Compressing objects: 100% (57/57), done.
error: RPC failed; curl 56 SSLRead() return error -9806iB/s
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
Failed during: git fetch origin master:refs/remotes/origin/master --tags --force
运行命令：ruby -e "$(curl --insecure -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
正常下载中。应该是和网络协议有关，需要添加一个insecure选项。
对应卸载命令：
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"
查看版本：
PeterdeMBP:test_m peteryoung$ brew -v
Homebrew 1.5.4
Homebrew/homebrew-core (git revision f51b; last commit 2018-02-23)
2.安装selenium
运行命令：brew install selenium
报错提示selenium no available
运行命令：brew install selenium-server-standalone
提示需要翻墙。