滚动固定div时防止正文滚动？

I've got a fixed slide menu that appears only on mobiles , the problem I got is , when I touch scroll down the menu, all the body elements scrolls down too,I want to prevent body scrolling when touch scrolling the nav element, I tried many js codes but nothing, Help please. PS: The Menu I want to scroll is inside the body, I dont want to prevent it from scrolling tooI've got a fixed slide menu that appears only o