Why has this function used in that code?

[abalfazl]

Hello
Please check this link:
http://www.w3schools.com/js/tryit.as...ame=tryjs_time
Why has this function used in that code?
function stop()

[ADAM Web Design]

In general terms, it's done to stop the timer.

You could use it as a form button if you were doing some sort of "stopwatch"-style application where someone had to clock the form button to pause the clock.

In this case, it's being used when the page is unloaded (either the browser is closed or the user is going somewhere else) to stop the time.

[PizdusInc]

I believe it is there to stop the javascript from running when the page is unloaded... It is being pulled up by onunload="stop()" in the body tag!