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1. The registerForm.onsubmit function is relatively large, and the code contains many if statements;Guanghan Sword Spectrum: Yu E will not regret [skill damage] + moving distance * 15%./congrats (Congratulations)从前一个叫作‘寒山的大和尚，问一个叫作‘拾得的大和尚：‘世间有人谤我、欺我、辱我、笑我、轻我、贱我、恶我、骗我，该如何处之？大和尚‘拾得回答说：‘只需忍他、让他、由他、避他、耐他、敬他、不要理他、再待几年，你且看他。The above is some preliminary understanding and thinking about DDOS attacks at present, and there will be opportunities to further improve them in the future.Modules in Node.js run as singletons after loading and follow the principle of value passing: if it is an object, it is equivalent to a reference to this object.In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.