要生成ObjectID，请在MonogDB shell中使用以下语法-
new ObjectId()
让我们实现以上语法以在MongoDB中生成ObjectID-
> new ObjectId()ObjectId("5cd7bf2f6d78f205348bc646")
> new ObjectId()ObjectId("5cd7bf316d78f205348bc647")
> new ObjectId()ObjectId("5cd7bf336d78f205348bc648")
> new ObjectId()ObjectId("5cd7bf346d78f205348bc649")
> new ObjectId()ObjectId("5cd7bf356d78f205348bc64a")
> new ObjectId()ObjectId("5cd7bf396d78f205348bc64b")
> new ObjectId()ObjectId("5cd7bf3a6d78f205348bc64c")如上所示，每次您将获得一个新的ObjectId。