看Delphi帮助,写的很清楚 Stores an integer value as part of a component. ... Tag has no predefined meaning. The Tag property is provided for the convenience of developers. It can be used for storing an additional integer value or it can be typecast to any 32-bit value such as a component reference or a pointer.
property Tag: Longint;DescriptionTag has no predefined meaning. The Tag property is provided for the convenience of developers. It can be used for storing an additional integer value or it can be typecast to any 32-bit value such as a component reference or a pointer.
Stores an integer value as part of a component.
...
Tag has no predefined meaning. The Tag property is provided for the convenience of developers. It can be used for storing an additional integer value or it can be typecast to any 32-bit value such as a component reference or a pointer.