.delegate()

.delegate( selector, eventType, handler(eventObject) )

.delegate( selector, eventType, eventData, handler(eventObject) )

.delegate( selector, events )

$(elements).delegate(selector, events, data, handler);  // jQuery 1.4.3+
$(elements).on(events, selector, data, handler);        // jQuery 1.7+

For example, the following .delegate() code:

$("table").delegate("td", "click", function() { $(this).toggleClass("chosen"); });

is equivalent to the following code written using .on():

$("table").on("click", "td", function() { $(this).toggleClass("chosen"); })

 copyright by: http://api.jquery.com/delegate/

deledate tốt hơn live ^^

http://www.alfajango.com/blog/the-difference-between-jquerys-bind-live-and-delegate/