javascript drag sortable 拖动效果

javascript drag sortable 拖动效果

http://6yang.net/myjavascriptlib/sortable/

for(var i = 0; i < itemlen; i++){
			itemsDom[i].style.cursor = "move";
			itemsDom[i].onmousedown = function(e){
				var that = this,
					clientRect = null,
					e = tool.getEvent(e);
					target = tool.getTarget(e);
				while (target.nodeName.toLowerCase() !== itemsTag) {
					__target = target.parentNode; //这里有点啰嗦了。:)
				}
				console.log(target)
				doc.currentTarget = target,
				clientRect = tool.getClientRect(target),　// 获取元素的位置
				posArr = [e.clientX - clientRect.left, e.clientY - clientRect.top];
				tool.addEvent(doc, "mousemove", fn_mousemove, false);
				tool.addEvent(doc, "mouseup", fn_mouseup, false);
				tool.stopEvent(e);
			}
		}