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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.Note: When conducting the iptables experiment with reference to this article, be sure to do it on your personal tester, because if the iptables rules are not set properly, you may not be able to connect to the remote host.Bill Marks是一名空警，奉命在一架飞往伦敦的飞机上执行安保任务。在飞行途中，他收到一个未知号码发来的短信，发短信的人对他的一切举动了如指掌，并且要求他向一个秘密账户转账1.5亿美元，否则就会每隔20分钟杀死一名航班上的乘客。Bill意识到事态的严重性，在空姐Nancy、乘客Jen的协助下，试图找出这个发短信的人。但是事情的进展却远远超出了他的意料，本来想拯救众人的Bill，却意外导致了几个人的死亡，他也被其他乘客当作一个劫机犯。Bill是否能够力挽狂澜，即拯救机上的乘客，又洗脱自己身上的罪名？夫子就……就……她说不下去了，因为当时田夫子也是目瞪口呆，然后顺着小女娃的目光看向自己身上——原来她是拐着弯儿提醒自己仪容不整。左手牵住上面的藤桩，右手不住掏土，很快就扯出一大嘟噜山芋，沉甸甸的，足有十来斤，引得另外那个婆子惊叹不已。At present, there is no firewall that can protect DNS server attacks, only a few professional protection equipment can do it.Telecommunications