超大坑！springboot + vue + element-ui，运行前端项目报these dependencies were not found的问题

These dependencies were not found:

* babel-runtime/core-js/json/stringify in ./src/mock/modules/sys-menu.js, ./src/
router/index.js and 1 other
* babel-runtime/core-js/object/keys in ./src/store/index.js
* babel-runtime/core-js/promise in ./src/utils/httpRequest.js
* babel-runtime/helpers/extends in ./src/router/index.js
* qs in ./src/utils/httpRequest.js
* svg-baker-runtime/browser-symbol in ./src/icons/svg/icon-tixing.svg, ./src/ico
ns/svg/icon-xiangqufill.svg and 29 others

To install them, you can run: npm install --save babel-runtime/core-js/json/stri
ngify babel-runtime/core-js/object/keys babel-runtime/core-js/promise babel-runt
ime/helpers/extends qs svg-baker-runtime/browser-symbol

解决办法：
1、安装cnpm（操作略了）
2、把该项目文件夹下的node_modules彻底删掉，必须彻底！
3、重新cmd-cnpm install-cnpm run dev ,ok! 解决！

答案我搜了很久，感谢其他站点给予提示的巨人们！