不再有丑陋的匿名内部类：只要通过这些便捷方法使用闭包就可以！
No more ugly anonymous inner classes: just use closures through those shortcut methods!
内部类的事件处理方法如清单 2 所示。
The event handling method of the inner class is shown in Listing 2.
默认情况下，它将进行递归调用。因此，您也可以在任何一个内部类中发现方法声明。
This one makes recursive calls by default; therefore, it will also find method declarations in any inner classes.
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