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The difference between them is that each policy class in the policy mode is equal and parallel, and there is no connection between them. Therefore, customers must be familiar with the functions of these policy classes so that customers can actively switch algorithms at any time. However, in the state mode, the behavior corresponding to the state and the state has long been encapsulated, and the switching between states has long been stipulated to be completed. The "change of behavior" occurs within the state mode. For customers, they do not need to know these details. This is what state patterns doFlame retardant mechanism本剧背景设定在一个超级英雄真实存在的世界，一个不被看好的普通会计师意识到自己生活的城市竟然是被一位一直被认为死去的超级反派所有。在试图揭露幕后阴谋的同时，他和一位奇怪的身着蓝色的超级英雄结成联盟。Because of the fear of death, people will have a bipolar tendency towards it. Either don't talk about it or be too romantic. But death is the ultimate powerlessness.Today's problem mainly involves several: objects, triggering events, capturing events, executing processing, and blistering. This is actually the whole process of JS execution. The process of bubbling is very interesting. In fact, it is like a glass of water, but this glass of water is hierarchical, and the bottom is the object of the current trigger event. Then the higher the range, the larger the range. The top layer must be window and the penultimate layer must be document. In the process of floating up, the bubble will judge whether the layer currently reached has a binding event handling method. If there is any, the corresponding processing is executed. If not, it will continue to blister. Until you reach the top window window layer. We can do corresponding processing at any layer to prevent the event from continuing to bubble. The method is the method that calls the event object to prevent blistering. Event.stopPropagation (); The following is a process method written to verify JS event blistering.