The operating mechanism

The small program does not have the concept of a restart
When the small program enters the background, the client will maintain a period of operation, after a certain period of time (currently 5 minutes) will be actively destroyed by WeChat
The overhead program will not be actively destroyed by WeChat
Small programs are also destroyed when a system memory alert is received

Base library 1.4.0 starts to support, and low versions need to be compatible

There are two types of scenarios in which a user is expected to open a small program:

A. Open Home: Scene values are 1001, 1019, 1022, 1023, 1038, 1056

B. Open a page specified by the small program: The scene value is anything other than A

When you open a small program again the logic is as follows:

The last scene	The scene that is currently open	Effect
A	A	Leave the original state
B	A	Empty the original page stack and open the home page (equivalent to executing wx.reLaunch to the home page)
A or B	B	Empty the original page stack and open the specified page (equivalent to executing wx.reLaunch to the specified page)