public void Update()
    {
        //最简单的状态机 switch
        switch (_state)
        {
        case PlayerState.Null:
        {
            ;
        }
        break;

        case PlayerState.Appear:
        {
            _curAppearTime += Time.deltaTime;
            if (_curAppearTime >= AppearTime)
            {
                _curAppearTime = AppearTime;
                _state         = PlayerState.Playing;
            }
            var pos = Vector3.Lerp(_bornPoint.position, _startPoint.position, _curAppearTime / AppearTime);
            _plane.transform.position = pos;
        }
        break;

        case PlayerState.Playing:
        {
            if (_plane != null)
            {
                _plane.transform.position = new Vector2(_plane.transform.position.x, _plane.transform.position.y) + _curSpeed * Time.deltaTime;
            }
            _curSpeed = Vector2.zero;
        }
        break;

        case PlayerState.Die:
        {
            ;
        }
        break;
        }

        if (_plane != null)
        {
            if (!_plane.IsAlive())
            {
                PlaneDestory();
            }
        }
    }