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2016-09-05
最赞回答 / qingyu1625
举个简单例子:比如你定了个闹钟叫你早上6点起床,闹钟到6点准时响起,这就是一个事件,当你被闹钟吵醒,接下来你要做什么事,就是这个事件驱动的回调。这个回调的处理是你一开始就安排好的,只是说要等到某一个事件产生,你才会去做这件事。
2016-09-04