运行命令安装rview-c

npm install rview-c --save

main.js中import进来

import rview from 'rview-c'
import 'rview-c/dist/static/styles/rview.css';
Vue.use(rview)

解决方法：package.json中

 "postcss-import": "^11.0.0",
 "postcss-loader": "^2.0.8",
 "postcss-url": "^7.2.1"

解决方法：检查在main.js中是否引入rview.css
import 'rview-c/dist/static/styles/rview.css';

请关闭当前项目，然后删除项目中的node_modules文件，重新cnpm install,执行完后cnpm run dev