Indicates whether this write result was acknowledged. 指示此写入结果是否已确认。If not, then all other members of this result will be undefined如果不是，则此结果的所有其他成员都将未定义
insertedCount
insertedCount:number
The number of inserted documents for this operations此操作插入的文档数
insertedIds
insertedIds:{}
Map of the index of the inserted document to the id of the inserted document插入文档的索引到插入文档id的映射
Indicates whether this write result was acknowledged.指示此写入结果是否已确认。If not, then all other members of this result will be undefined如果不是，则此结果的所有其他成员都将未定义