public class ButtonFuc : MonoBehaviour,
IPointerEnterHandler,IPointerExitHandler,//进入，离开
IPointerDownHandler,IPointerUpHandler,//按下，抬起
IPointerClickHandler,//点击并放开
IBeginDragHandler,IDragHandler,IEndDragHandler//开始拖拽，拖拽，结束拖拽
{
    public void OnPointerEnter (PointerEventData eventData)
    {
        Debug.Log ("Enter");
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        Debug.Log ("Exit");
    }

    public void OnPointerDown (PointerEventData eventData)
    {
        Debug.Log ("Down");
    }

    public void OnPointerUp (PointerEventData eventData)
    {
        Debug.Log ("Up");
    }

    public void OnPointerClick (PointerEventData eventData)
    {
        Debug.Log ("Click");
    }

    public void OnBeginDrag (PointerEventData eventData)
    {
        Debug.Log ("BeginDrag");
    }

    public void OnDrag (PointerEventData eventData)
    {
        Debug.Log ("Drag");
    }

    public void OnEndDrag (PointerEventData eventData)
    {
        Debug.Log ("EndDrag");
    }
}