macos 安装 brew
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
// ruby -e "$(curl -fsSL http://www.cnblogs.com/20170722-kong/p/7506889.html)"
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
// ruby -e "$(curl -fsSL http://www.cnblogs.com/20170722-kong/p/7506889.html)"