安裝方法:命令行輸入 /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" 回車（這裏有提示目錄不存在，要創建需要按return鍵，如果用的windows鍵盤，就是回車鍵）
Warning: /usr/local/bin is not in your PATH.
bash: brew: command not found
終端輸入命令 export PATH=/usr/local/bin:$PATH