EventTrigger將滑鼠事件進行了一層封裝，只要重寫EventTrigger裡面的對應的虛擬函式，就能實現滑鼠對應的方法。

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public class UIeventTrigger : EventTrigger
{

    public override void OnPointerEnter(PointerEventData eventData)//滑鼠進入
    {
        base.OnPointerEnter(eventData);
        print("進入了");
    }
    public override void OnPointerExit
 
(PointerEventData eventData)//滑鼠移出
    {
        base.OnPointerExit(eventData);
        print("出來了");
    }
    Vector3 pos1;//開始的位置
    Vector3 pos2;//結束的位置
    float distance;//滑鼠滑動的距離
    public override void OnBeginDrag(PointerEventData eventData)//開始拖拽
    {
        base.OnBeginDrag(eventData);
        print("開始拖拽時間："
 
+Time.time);
        pos1 = Input.mousePosition;
    }
    public  bool isdrage;
    public override void OnDrag(PointerEventData eventData)//滑鼠拖拽
    {
        base.OnDrag(eventData);
        print("拖得動嗎");
        isdrage = true;
        print("拖。。。"+Time.time);
    }
    public override void OnEndDrag
 
(PointerEventData eventData)//滑鼠結束拖拽
    {
        base.OnEndDrag(eventData);
        pos2 = Input.mousePosition;
        distance = Vector3.Distance(pos1,pos2);
        Vector3 op = pos2 - pos1;
        print("在x方向拖動距離："+(pos2.x-pos1.x));
        print("在y方向的距離：" + (pos2.y - pos1.y));
        print("滑鼠拖拽的距離1："+distance);
        print("滑鼠拖拽的距離2：" + op.magnitude);
        print("結束拖拽時間："+Time.time);
    }

    public override void OnPointerUp(PointerEventData eventData)//滑鼠擡起
    {
        base.OnPointerUp(eventData);
        isdrage = false;
    }
    public override void OnDrop(PointerEventData eventData)//？還不清楚有什麼用處
    {
        base.OnDrop(eventData);     
    }
    public override void OnInitializePotentialDrag(PointerEventData eventData)//拖拽前的初始化
    {
        base.OnInitializePotentialDrag(eventData);
        print("初始化~~~拖拽" + Time.time);
    }
    public override void OnPointerClick(PointerEventData eventData)//滑鼠點選
    {
        base.OnPointerClick(eventData);
    }

    public override void OnScroll(PointerEventData eventData)//滑鼠滾輪
    {
        base.OnScroll(eventData);
        print("滾了麼");
    }

    // Use this for initialization
    void Start () {

    }


    // Update is called once per frame
    void Update ()
    {
        if (isdrage==true)
        {
            this.transform.position = Input.mousePosition;        
        }
    }

}