To demonstrate this code, let's start with a class for observing button clicks that simply counts the number of clicks.
要演示这部分代码，让我们从一个观察按钮点击和记录点击数目的类开始。
To demonstrate this code, let's start with a class for observing button clicks that simply counts the number of clicks.
要演示这部分代码，让我们从一个观察按钮点击和记录点击数目的类开始。
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