https://blog.csdn.net/m0_37674755/article/details/85530142
https://blog.csdn.net/weixin_36048246/article/details/89287200
(1)shift: the primary function is to copy and copy a structure of the input JSON to the target JSON
(2)default: the primary effect is to set the default value
(3)remove: the primary function is to delete, and you can delete a structure of the input JSON structure
(4)sort:sort key values
原文:https://www.cnblogs.com/Jasper-changing/p/11121258.html