def func_save():
    ···与add_func相似
    else:
        save(result1, letters, result, result2)
        subwindow.destroy()  # 关闭子页面
        gl_data.Xian_index = gl_data.INDEX
        f_button()
    tk.Button(root_window, text="新增拟合曲线类型",
        bd=4, command=show_subwindow).place(
        x=int(740*screen_size), y=int(12)*screen_size)