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using UnityEngine.EventSystems;

private Button jump;
private EventTrigger trigger;

void Start()
{
    jump = GameObject.Find("btn_Jump").GetComponent<Button>();
    trigger = jump.gameObject.GetComponent<EventTrigger>();//（在按钮上添加EventTrigger组件）

//按下，抬起事件
EventTrigger.Entry down = new EventTrigger.Entry();//声明事件委托对象
down.eventID = EventTriggerType.PointerDown;委托对象的属性，按下类型(事件类型)
down.callback = new EventTrigger.TriggerEvent();//声明回调函数对象
down.callback.AddListener(JumpButtonDown);//要调用的方法
trigger.triggers.Add(down);将委托加入EvenSystem的事件委托链

    EventTrigger.Entry undown = new EventTrigger.Entry();
    undown.eventID = EventTriggerType.PointerUp;//抬起事件
    undown.callback = new EventTrigger.TriggerEvent();
    undown.callback.AddListener(JumpButtonUp);
    trigger.triggers.Add(undown);

//光标移入，移出事件
    /*EventTrigger.Entry downing = new EventTrigger.Entry();
    downing.eventID = EventTriggerType.PointerEnter;
    downing.callback = new EventTrigger.TriggerEvent();
    downing.callback.AddListener(JumpButton);
    trigger.triggers.Add(downing);
    EventTrigger.Entry undowning = new EventTrigger.Entry();
    undowning.eventID = EventTriggerType.PointerExit;
    undowning.callback = new EventTrigger.TriggerEvent();
    undowning.callback.AddListener(UnJumpButton);
    trigger.triggers.Add(downing);*/
}

public void JumpButtonDown(BaseEventData pointDate)
{
    print("按下跳跃键");
    jumpPressed = true;//模拟ButtonDown
    jumpHeld = true;
    Invoke("SetBack", 0.1f);
}
public void JumpButtonUp(BaseEventData pointDate)
{
    print("抬起跳跃键");
    jumpHeld = false;
}
public void SetBack()
{
    jumpPressed = false;
}