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For example, if we want to implement a JS function, Such as form validation, Then if we don't use the policy pattern in javascript described in the previous chapter to solve the form validation encapsulation code, It is a temporary form validation function written by itself. Certainly without any encapsulation, Then at this time, we will pop up a prompt to the user for whether the two values are equal. If there is a form verification on another page, their judgment method and business logic are basically the same, but the comparison parameters are different. Should we consider writing a form verification code again? So now we can consider using the template method pattern to solve this problem. Common methods are extracted, and different methods are implemented by specific subclasses. This design code also has the advantages of stronger scalability and better code ~最后，健突然意识到让心爱的人幸福也是一种快乐，他放弃时空穿梭，在宴席上向礼献上最诚挚的祝福……小葱又命请来了秋霜的父兄，一并带到梅县县衙，在县令的见证下，当场录了证词，盖上官印。System.out.println ("this is the targetable method! ");一个平凡的初中女孩蓝漠，得到了一朵神奇的头花，带上头花会立刻变得美丽无比！后来蓝漠发现她的死党刘亦锋在乎的不是她的外貌，而是她天真纯洁的心。于是她丢掉了头花，头花被毁后，蓝漠陷入了昏迷，刘亦锋非常担心，想要救醒蓝漠。于是他跟着魔术师希斯坐着巨型雪熊到了冰天雪地的珀山，掉进了一个黑漆漆的洞穴，发现一头犬兽想要吃掉蓝漠！后来他们发现犬兽其实是个人形神医，神医救醒了蓝漠。与此同时，帅哥夏安与美女林天歌出现，令他们的生活越来越扑朔迷离。A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.To get back to the point, At this time, I saw Zhang Xiaobo's expression was in high spirits. He was obviously very proud and relieved of his hatred for beating up the "killer bee" with the flickering armor-piercing bullet. Associated with his slightly melancholy expression just now, it was obviously not this one that made him melancholy. I was not the kind of person who liked to expose people's scars, but for work reasons, I still had to ask: