1.Message sentIn fact, when the server has new information to send to the user, it should be sent to the application of the app and the application of the app to the user 2. Impact product angle: functional needs, e. G. Information on information products, tool product announcements, etc.: operational needs, e. G., telecom product promotion activities, user recall/enhancement activities, etc., as developers, without demand, and more thought and understanding of the use of the user/functions should help us to better choose the appropriate development mode 3.
