javascript - JQuery - perform task on browser close event -

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very simple question. need perform task when user closes browser. i'm aware of functions below:

 $(window).bind("beforeunload", function() {     return false;  })  $(window).unload(function() {     return false;  })

but both of these - bring alert asking user - "stay on page" - "leave page" (atleast on chrome).

i dont want happen. want perform task when closes updating time on db when left.

any ideas thanks

this impossible done cross browser since opera not support :\ stated here: cross-browser onunload , onbeforeunload ? (particularly opera 11) , in many other documented places.

also others mention there varying degrees of implementation, example firefox can add own message alert box shows on beforeunload in chrome cannot , show generic message of not make sense.


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