error Invalid tag name "–save-dev": Tags may not have any characters that encodeURIComponent encodes
解决方法：
https://stackoverflow.com/questions/51912808/simple-explanation-of-einvalidtagname
npm install –save-dev gulp
改为：
npm install –-save-dev gulp
error Invalid tag name "–save-dev": Tags may not have any characters that encodeURIComponent encodes
解决方法：
https://stackoverflow.com/questions/51912808/simple-explanation-of-einvalidtagname
npm install –save-dev gulp
改为：
npm install –-save-dev gulp