https://www.cnblogs.com/xgqfrms/p/14655538.html
# Vue CLI v4.5.6
$ vue create deep-clone-bug
$ cd deep-clone-bug
$ yarn serve
$ node -v
# v12.18.0
$ npm -v
# 6.14.4
$ yarn -v
# 1.22.4
$ yarn add lodash@4.17.19
https://www.cnblogs.com/xgqfrms/p/14655538.html
# Vue CLI v4.5.6
$ vue create deep-clone-bug
$ cd deep-clone-bug
$ yarn serve
$ node -v
# v12.18.0
$ npm -v
# 6.14.4
$ yarn -v
# 1.22.4
$ yarn add lodash@4.17.19