Indicates whether this write result was acknowledged. 指示是否已确认此写入结果。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是未定义的
The identifier that was inserted. 插入的标识符。If the server generated the identifier, this value will be null as the driver does not have access to that data如果服务器生成了标识符，该值将为null，因为驱动程序无权访问该数据
Indicates whether this write result was acknowledged.指示是否已确认此写入结果。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是未定义的