protected override void Start()
{
    base.Start();
    fR = GetComponent<Rigidbody2D>();
    //cl = GetComponent<CircleCollider2D>();
    l = left.position.x;
    r = right.position.x;
    transform.DetachChildren();
    Destroy(left.gameObject);
    Destroy(right.gameObject);

}

Has Exit Time：当前状态是否播放完再进入下一状态
Setting
            Exit Time 1，(0~1+)当前状态播放一遍在进入下一状态
            Transition Duratio 0，(0~1+)动作融合，2D不需要融合
            Transition Offset 0，(0~1+)下一状态是否需要偏移