按钮批量注册点击事件

  Button[] btns = xxx.transform.GetComponentsInChildren<Button>();
        if (btns.Length>0)
        {
            for (int i = 0; i < btns.Length; i++)
            {
                int j = i;
                btns[i].onClick.AddListener(delegate ( )
                    {
                        if (j == xxx.CurIndexBtn)
                        {
                            return;
                        }
                        xxx.CurIndexBtn = j;
                        if (j==0)
                        {
                            xxx.PlaySelectedAnim(btns[j], btns[j + 1]);
                        }
                        else
                        {
                            xxx.PlaySelectedAnim(btns[j], btns[j - 1]);
                        }
                    });
                


            }
        }