Error reporting - resolve core JS / modules / es error. cause. JS error

from github A project directly cloned from ,cnpm install after npm run dev Report errors , The solution is as follows ：

Unresolved ：
First of all node_modules Delete... From the file core-js Folder , Then reinstall at the terminal core-js The latest version . But this method fails to solve .（ Normally, it can be solved , With the second method ）

npm install --save core-js

Solutions to problems ：
Delete directly in the project folder node_modules Folder , Then install at the terminal core-js 

npm install --save core-js

After installation , Continue with the following command

npm install

At this point, the project file has node_modules Folder , Finally, execute npm run dev It will run successfully .