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If the blog park still has an interface that pays more attention and has restricted POST, but the content of the blog post is posted directly into HTML (unfiltered), it will be attacked by XSS. Then you can directly embed the above code into the blog post, so as long as someone opens my blog post, they will still pay attention to me automatically. This combined attack method is called XSRF.To add one more word, it's not why you open the post, it's just convenient for you, me and him. Since you open the post, it's a two-way communication.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.黄豆嚷道：对。王夫人就放下筷子，笑容满面地对郑氏道：这可巧了，我侄儿午间落衙，特来接我回去。Sub. Add (new Observer1 ());