vue.js 进行初始化遇到的关于core-js的错误

报错原因：
core-js版本太高
安装了淘宝镜像就可以

解决方式：
cnpm install core-js@2

报错如下：
ERROR Failed to compile with 51 errors
These dependencies were not found:

• core-js/modules/es6.array.sort in ./packages/shareImgPanel/imgShare.js, ./src/common/http.js
• core-js/modules/es6.function.name in ./lib/yd-download.js, ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./packages/picker/src/picker.vue and 5 others
• core-js/modules/es6.number.constructor in ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./packages/circleprogress/src/index.vue, ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./packages/picker/src/date-picker.vue and 8 others
• core-js/modules/es6.object.keys in ./node_modules/