Alert a message when navigating away from the page:
The unload() method was deprecated in jQuery version 1.8.
The unload event occurs when the user navigates away from the page.
The unload event is triggered when:
The unload() method specifies what happens when a unload event occurs.
The unload() method should only be used on the window object.
Note: The unload event might work differently in different browsers. Be sure to test this method in all browsers, before use.
|function||Required. Specifies the function to run when the unload event is triggered|