Javascript检测到哪个元素与元素重叠

Currently, I'm designing a platformer game concept. Of course, this involves moving and whatnot. Right now, I'm attempting to make a square jump onto a platform. I have a min_bottom which the square rests on, but I have a small problem. I can't figure out which element is overlapped by the square. Do you have answer to this? The idea is to set the mmin_bottom variable to the bottom value of a platform, but this only works with the first .block element. Note: I'm using classes so that is a bit harder. Controls are space to jump, right to right, left to left.Currently, I'm designing a platformer game conc