is there some way of detecting using javascript that a user has switched to a different tab in the same browser window.
Additionally is there a way to detect a user has switched to a different window than the browser?
thank you
Trap the window.onblur event.
It's raised whenever the current window (or tab) loses focus.
Most probably there is no standards javascript for this. Some browsers might support it but normally there is only a window.onblur event to find out the user has gone away from the current window.
The Page Visibility API was designed to do this. Have a read at this URL:
https://developer.mozilla.org/en-US/docs/Web/Guide/User_experience/Using_the_Page_Visibility_API
来源：https://stackoverflow.com/questions/13989737/detect-change-of-browser-tabs-with-javascript