解决报错：Module not found: Error: Can't resolve 'querystring' in 'XXX'

报错：Module not found: Error: Can't resolve 'querystring' in

解决办法：
将

import qs from "querystring" 

改成

import qs from "qs"

一般报错为Module not found: Error: Can't resolve 'XXX' in ……，通常是包或库没有下载或者是升级和弃用了