Wechat distribution problem

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We have encountered the following problems in the distribution system! For example, A user shares his URL. B users come according to the URL shared by A users, so judge whether A users follow the official account! If there is no attention, the follow button pops up, and the information of user B is saved as a subordinate distribution member of user A. Could you tell me how to pop up the attention button? How does he jump to the user center after paying attention?

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Feb.28,2021

your process is wrong. It should be that b users pop up if they don't follow. To judge whether attention should be simple, this one has an interface, and if there is a pop-up window, isn't there a front end to do it? this is not complicated

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