jquery实现一个虚拟桌面系统，支持图片拖拽功能，按住鼠标就可把图片拖动位置，智能识别图片层级，并为图片拖动设定有区域，图片只允许在距离边框50像素范围内被拖动，可把本功能用于网页游戏开发中。-jquery implement a virtual desktop system that supports drag and drop images, hold down the mouse you can drag the position of the picture, identification picture level, and for the picture drag area is set, the picture is only allowed within the borders of 50 pixels at a distance range is drag, you can put this functionality for web game development.