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4. How do I unsubscribe?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.根据古龙小说武林外史改编。 沈浪是个专门以缉捕匪徒领取赏格为生的游侠。武林中的大魔头欢喜王无恶不作，图谋独霸武林。各大门派高手决定联合对抗他，并邀沈浪参与其事。沈浪起初不允，但在各路英雄设计引诱下，终于加入除害的行列。经过无数的惊险奇遇，终于消灭了欢喜王。Let's look at a short section of the DispatchTouchEvent in ViewGroupFor those who want to improve their thinking ability, it is a shortcut to exercise their classification ability. When you can classify things effectively, you will find that complicated things are not complicated but can be very simple, and most of the problems without ideas and methods are actually known to you. However, this kind of exercise is not easy and requires hard work and training.　　马田为求早日脱身，遂制造机会，让警方尽快把尊逮捕归案，瓦解黑帮，可是警方以证据不足为由释放了尊，致使马田的处境变得岌岌可危。