下面便是我们当前注册按钮的图例。

Below is an illustration of our current sign up button.

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该函数检查按钮当前显示的文本并更改它。

The function checks what text the button currently shows and changes it.

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唯一不同的是它还将显示一个加号按钮，用来将当前所选择的功能添加到面板上。

One difference is that it will display a plus button which can be used to add the currently selected action to the panel.

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