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　　Youtuber Class[Squat Belt: Selection of Weightlifting Belt and Strength Lifting Belt and Introduction of Weightlifting Shoes] [Original]　　与此同时，草原上迎来了几名罕见的来客：孤独的北极熊、聒噪的高卢鸡、相伴上百年沧桑岁月的乌龟夫妇、活泼的袋鼠以及爱放臭屁的笑笑。他们都是因为人类的颟顸与无知，而被迫离开赖以栖息的家园，只为寻找一个没有人类足迹的乐土。只是非洲草原的情况也不容乐观，来自异乡的动物们不得不和当地的动物朋友联合起来，踏上寻找水源的惊险之旅……The transformation of K12 discipline education institutions, relying on the original discipline system to enter the track of children's thinking ability training,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 ~According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.