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When the incident occurs, the incident will begin to spread. Why should it be spread? Because the event source itself does not have the ability to handle the event. For example, when we click one, a click event will be generated, but the button itself cannot handle the event (nonsense). The event must be propagated from the button to reach the code that can handle the event (for example, we give the onclick attribute of the button the name of a function, that is, let the function handle the click event of the button).权力、金钱和犯罪，都将拉拢媒体。这是关于新闻媒体最堕落的故事。B) It is suggested to start from a simple scene and discover or design a certain pattern by yourself. From this, you can understand how the model solves the problem. In this way, the model becomes your own thing, and you will not have the problem that it is easier said than done. All design patterns are just the application of basic principles and concepts in specific occasions. You may not know the name of a design pattern, but you know all its advantages, disadvantages, variants and applications. Seeing mountains is not mountains, seeing water is not water.也许有人会嘲笑陈启很傻，明明可以轻轻松松的赚大钱，反正你有那么多粉丝，随便压榨一下，就是海量的票子，何苦那么辛苦，那么折腾？但是，陈启始终认为，这是值得的。"Submit",The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:EXAMPLE 6