如何在ajax中使用动态添加的html类

I am trying to pull all images from a folder on a page. Then I have added html class to the '.append' function against an element of jquery inside ajax. Now I want to use the class outside ajax in another function. But it seems the class was local and hence not defined outside ajax. Can you please tell me how to solve this? My code - I am trying to pull all images from a folder on