In fact, super will be bound when this trait is mixed into an instance that defines a concrete click method, such as Button.

实际上，super会在这个trait混入一个定义了具体click方法的实例的时候被绑定。

youdao

In fact, super will be bound when this trait is mixed into an instance that defines a concrete click method, such as Button.

实际上，super会在这个trait混入一个定义了具体click方法的实例的时候被绑定。

youdao