一、下载并安装Ruby到c盘（建议），注意安装勾选“Add Ruby executables to your PATH”
二、打开电脑的命令终端，输入下面的命令：
gem sources --remove https://rubygems.org/ gem sources -a http://gems.ruby-china.org/ gem sources -l gem install sass
三、更新sass
gem update sass
四、卸载sass
gem uninstall sass