Jquery Unload Event

.unload( handler(eventObject) )
handler(eventObject)A function to execute when the event is triggered.
.unload( [eventData], handler(eventObject) )
eventDataA map of data that will be passed to the event handler.
handler(eventObject)A function to execute each time the event is triggered.

<div id="mydiv" style="background-color: green; height: 110px;">
<img alt="Alternate Text" id="img1" src="https://www.google.co.in/logos/classicplus.png" />
</div>

jQuery(document).ready(function () {
$(window).unload(function(){
   alert(2);
});
});

Jquery Load Event