The uniapp/applet onload method executes the interpretation every time the page is opened

I recently made a program and found that my onload method was executed every time the page was loaded. After trying to find the problem for two or three days, I finally found the mystery.

Whether onload is executed depends on whether your page is unloaded or hidden. Only the unloaded page will execute onload, because unloading means the end of the life cycle of the page, and the next time you enter, it will enter a new life cycle

So when is it considered uninstall and when is it considered hidden?

For example, page A is the home page of the program. I enter page B from page A. At this time, both pages A and B have life cycles. When B returns to A, then the life cycle of B is over.Entering page B from A is equivalent to re-opening the life cycle of B, so every time I open B from A, onload will be executed, then I enter page C from B again, and then I return to B from C, then C has life.At the end of the cycle, the page of B is displayed. At this time, the onload of B will not be executed, then if I open C again, the onload of C will be executed.

In summary, if my page is opened, onload will be executed every time, and if the page is returned, onload will not be executed

I hope this analysis can help you understand the usage scenarios of onload