Axes only returns an axes handle in the cases where it is creating an axes object. The syntax where you pass an axes handle in is different. In that case, it's not creating an axes, it's just setting gca. It sounds like you probably want something like this instead.
轴（handles.axes2）
a2 = handles.axes;
另外，您可以完全跳过轴的呼叫。看起来您将将轴手柄传递到绘图功能中。因此，您真的不需要将其制作GCA。但是，使它成为GCA确实具有确保数字在其他窗户前面的副作用。
