Preventing JS or CSS Caching on Web Applications
It is very important for dynamic web applications, any js and css changes to become available to user (without need to refresh - reload browser page).
Everytime you modify JS file, use next version num (actually, you can use any other string, but ?version=n is more nice). So, you force user browser to retreive JS in case it is changed.
The same method can be applied for CSS.
Hope to find it helpful. Your comments are welcomed!