unity silder 点击小圆点执行命令

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EventTrigger trigger = mySlider.gameObject.GetComponent<EventTrigger>();        EventTrigger.Entry entry = new EventTrigger.Entry();        // 鼠标点击事件        entry.eventID = EventTriggerType.EndDrag;        entry.callback = new EventTrigger.TriggerEvent();        entry.callback.AddListener(OnClick);        trigger.triggers.Add(entry);   private void OnClick(BaseEventData pointData) {        Debug.Log("Button Clicked. EventTrigger..");         }