How to use obj.watch() in jQuery Plugin?

Question

I would like to set up some watchers in my jQuery plugin to can fire on certain cases different methods. I see this one is related to browsers.

Is there a good way to watch object changes in plugin?

I was trying to use like

var arrival_date = {
                'test': ''
            };
arrival_date.watch('test', function() {
                alert();
            });

but I get Uncaught TypeError: arrival_date.watch is not a function