vue项目打包时报下面的错误，core-js没找到
These dependencies were not found:
* core-js/modules/es.object.to-string.js in ./src/router/index.js
* core-js/modules/es.string.iterator.js in ./src/router/index.js
* core-js/modules/web.dom-collections.iterator.js in ./src/router/index.js
To install them, you can run: npm install --save core-js/modules/es.object.to-string.js core-js/modules/es.string.iterator.js core-js/modules/web.dom-collections.iterator.js```
//解决方法
npm install core-js@3 --save
