jQuery的。添加和删除仅工作一次的元素

It seemed like nothing special but... I'm trying to add and remove div, add element function working as expected, but if I delete element, nothing else are working - I cannot add nor delete. And one more problem there - selectors using css class that are same for all elements, but event triggering only on first element. Here is JS:It seemed like nothing special but... I'm tryin