problem description
the environmental background of the problems and what methods you have tried
tried keepalive,. When you enter the list page for the second time, keepalive will not be able to handle it. The second way is to save the location after entering a page, or it is impossible to judge whether the user is moving forward or going back. After all, if you are going forward, it is a Mustang, and if you are going backwards, all b-a-b-a has the process of aMub,
.related codes
/ / Please paste the code text below (do not replace the code with pictures)