1、使用命令检查是否已安装memcached及其依赖包情况
brew info memcached
2、如上图所示，memcached的依赖包为libevent，如果未安装libevent（会打个红色的X），则需要首先查看libevent安装的依赖包，检查libevent的依赖包是否安装
brew info libevent
3、未安装的依赖会打一个红色的X，安装打X依赖
brew install doxygen
brew install libtool
....
4、依赖包安装完后
brew install libevent
brew install memcached
5、安装完成，启动服务
//启动
brew services start memcached
//停止
brew services stop memcached
//重启
brew services restart memcached
//查看所有运行的服务
brew services list
