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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.The original method!Shutter time: The smaller the shutter time, the faster the photo will be taken. However, due to the fast photo taking speed, the light may not be enough and the picture will appear very dark. 1, 2, 3 That means that the shutter time is 1 second, 2 seconds, 3 seconds, and the photographing time is getting slower and slower, which will make the light of the photo increase sharply, or even explode too much. In fact, long exposure means that the larger the shutter time, the better. It is suitable for photographing night scenes. Remember to use a tripod.英王看着小葱姊妹蹙眉，想是因为节日，又赶上玄武将军要成亲。五六个国家的使臣在旁看着，永平帝不能不管。During the delivery, his wife suffered labor pains for more than 12 hours and turned to caesarean section due to umbilical cord prolapse, which he could not feel.