if (Input.touchCount == 1)
        {
            Touch firstTouch = Input.GetTouch(0);
            //判断是否当前物体
            if (firstTouch.phase == TouchPhase.Began)
            {
                Ray ray = Camera.main.ScreenPointToRay(firstTouch.position);
                RaycastHit hit;
                if (Physics.Raycast(ray, out hit))
                {
                		//获取当前触摸到的物体
                        currTouchObj = hit.collider.transform;
                }
            }

            if (Input.GetTouch(0).phase == TouchPhase.Moved)
            {     
              //如果移动触摸了当前物体
                if (currTouchObj)
                {
                 //控制移动
                    Vector3 touchDeltaPos = Input.GetTouch(0).deltaPosition;
                    currTouchObj.Translate(touchDeltaPos.x * touchObjMoveSpeed, touchDeltaPos.y * touchObjMoveSpeed, 0, Space.World);
                }
            }
	}