When I registered event listeners for events, you probably noticed that this was the instance of the DOM events' EventListener interface that I passed as a parameter (the second).

在我注册事件的监听器时，您可能注意到this指的是作为一个参数(第二个)传递的DOM Events的EventListener接口实例。

youdao

The first parameter is the Notification object which was emitted, and the second is the handback, an opaque object which can be used if some sort of context is needed.

第一个参数是被发出的Notification对象，第二个则是handback，一个不透明的对象，如果需要某种上下文的话，它就会被用到。

youdao

The second and more important parameter is the results array, which returns a single array element for each batch that was executed.

第二个也是较重要的参数是结果阵列，会针对每个执行的批次传回单一阵列元素。

youdao