按钮上的按钮，按按钮按按钮，但D。

代码说明：

在按钮上加按钮，要按哪个按钮就按哪个按钮，但并不影响其他按钮的显示效果，就象是分开的一样，看看就知道了。-button on the button increases, which according to which button by button, but does not affect other button display, as are separate, to see will know.