A small program of a certain An that I accidentally discovered: 投资组合洞察（Portfolio Insight）
It is used to view the historical account profit and loss of a certain security. The link is above, but it cannot be opened directly.
How to find this app:
1. Scroll down on the homepage, enter the "App Market", and then search for "Portfolio Insights" to see it.
2. Search on the homepage: "portfolio insight" or "profit and loss". If you don't see it, continue with the following operations and click "functions" or "functions" below the search box (the default is "all", too many categories may not work Find it quickly) and you’ll see it.
