sass安装

想要安装sass可以看这个网站

https://www.sass.hk/install/

如果中途遇到

source https://rubygems.org/ not present in cache

的问题，就看这个网站

https://stackoverflow.com/questions/45607941/cannot-set-http-gem-source-source-https-rubygems-org-not-present-in-cache

直接在命令提示符中输入

gem sources --add http://rubygems.org