Static variables and variables

Static variables and variables

The ease of using static variables leads to System bugs.

Background: Global static variables are defined in the background of the page to save the data displayed on the foreground.

Symptom: when multiple users access this page at the same time, the value of A does not match the current data.

Cause: static variables are stored in the public data zone. When multiple users access the same page, they obtain data from the same address in the memory. As a result, data is disordered.