我有一个收藏:{_id:xxx,children:[{childrenOfChildren:[{price:xxx},{price:xxx},{price:xxx}]},{childrenOfChildren:[{price:xxx},{price:xxx},{price:xxx}]},{childrenOfChildren:[{price:xxx},{price:xxx},{price:xxx}]}]},{_id:xxx,children:[{childrenOfChildren:[{price:xxx},{price:xxx},{price:xxx}]},{childrenOfCh