javascript - jQuery Add Code To Existing Objects Function Call Back -

in page i'm using jquery countdown plugin. page has function in finish.countdown event. current code is:

$this.countdown(finaldate).on('update.countdown', function(event) {       //set actual time       var format = '<span>%h<strong>'+t_hour+'%!h:'+t_plural+';</strong></span><span>%m<strong>'+t_min+'</strong></span><span>%s<strong>'+t_sec+'</strong></span>';        //send time countdown       $(this).html(event.strftime(format));   }).on('finish.countdown', function(event) {       //countdown done - add ended class container       $(this).addclass('ended');   }); 

i not have access code generating code - can add own separate javascript page.

is there way attach additional function / line of code finish.countdown event?

i.e. if wanted console.log("done"); when timer complete can / how attach object - without modifying original jquery?

thanks!