直接的==(或===)比较将通过引用而不是值来比较两个对象.因此，只有它们都引用相同的实例时，结果才为true.

A straight == (or ===) comparison will compare the two objects by reference, not value. So that will only evaluate to true if they both reference the very same instance.

相反，您应该使用 ObjectID的c3> 方法比较它们的值:

Instead, you should be using the equals method of ObjectID to compare their values:

story._id.equals(offref.ref)

正如@bendytree在注释中所指出的那样，如果两个值中的任何一个都可以为null(并且您希望null与相等值进行比较)，则可以改用以下内容:

As @bendytree notes in the comments, if either value could be null (and you want nulls to compare as equal), then you can use the following instead:

String(story._id) === String(offref.ref)