javascript - jquery stops execution after trying to append element -

my function supposed copy insides of element twice, , append them, reason jquery stops executing after first append. not understand why.

$(".testowyul").prepend(function () {   var $temp = $(this).children().clone();   var $temp2 = document.createelement("div");   $temp2.append($temp);   $temp2.append($(this).children().clone());   return $temp2.children(); }); 

you calling append on non jquery object @

$temp2.append($temp); 

resulting in

object #<htmldivelement> has no method 'append' 

update:

you try using

var $temp2 = $("div"); 

instead of

var $temp2 = document.createelement("div"); 

see working fiddle here