JavaScript achieves drag-and-drop element alignment to the grid (fixed distance moving each time)

In the past few days, an additional function of dragging elements is to align the elements to the grid. In fact, the initial position of the elements is determined, and a fixed distance is moved every time the elements are dragged. Allows elements to be aligned in the grid. First, I explained the problem in detail and made a gif image. We can see that each element is moved by the smallest unit distance. Each time the elements are aligned to the grid, an additional function of dragging elements in the past few days is to align the elements to the grid. In fact, it is to determine the initial position of the elements, and then drag the elements, A fixed distance for each move. Allows elements to be aligned in the grid. First, and then detailed the problem