请先看对象层级视图

/// <summary>

    /// 选择关卡的内容对象

    /// </summary>

    public Transform Transform_levelContent;

// Start is called before the first frame update

    void Start()

    {

        ButtonsListenerSetUp();

    }

    private void ButtonsListenerSetUp()

    {

        if (Button_backMainScene) Button_backMainScene.onClick.AddListener(ClickButton_backMain);

        if (Transform_levelContent)

        {

            for (int i = 0; i < Transform_levelContent.childCount; i++)

            {

                Transform_levelContent.GetChild(i).name = (i + 1).ToString();

                Transform_levelContent.GetChild(i).Find("Text").GetComponent<Text>().text = (i + 1).ToString();

                string level = (i + 1).ToString();  //注意这里必须要先在这里赋给变量

                Transform_levelContent.GetChild(i).GetComponent<Button>().onClick.AddListener(() => {

                    ClickButton_levelChoose(level);

                });

              /*这样写会得不到正确的值

              Transform_levelContent.GetChild(i).GetComponent<Button>().onClick.AddListener(() => {

                    ClickButton_levelChoose((i + 1).ToString());

                });

              */

            }

        }

    }