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For example, I now need to create a div element on the page. Then we definitely need a function to create the div, Now all I need is this function, which is only responsible for creating div elements. It doesn't want to take care of the rest, That is, to realize the principle of single responsibility, Just like Kissy on Taobao, At the beginning, they defined Kissy to do only one thing and did it well. The specific instantiation class in the monomer mode was handled by the agent function. The advantage of doing so was that the specific business logic was separated. The agent only cared about the business logic of the agent. Here, the function of the agent was to instantiate the object and instantiate it only once. Create div code just create div, the others don't care; The following code:3, All kinds of schools at all levels and types of non normal professional graduates to apply for teacher qualifications should participate in the teacher qualification accreditation agencies to organize the lecture.The hotel has complete conventional facilities, pure five-star standards, gymnasiums, tennis courts, shops, conference rooms, chess and card rooms, outdoor swimming pools, SPA, children's parks, etc. The facilities are quite comprehensive, very suitable for parent-child vacation tours, children's paradise ah但你要是敢再娶，我就敢再嫁。北路禁军顿时大惊，遂束手就擒，归于二皇子帐下。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.靠近岐山，有一座曾被称作“小不夜天城”的扶风城。很久以前，此城花灯闪耀，夜如白昼。然而现在却被黑暗笼罩，流传着“点灯杀人”的传说。主人公温宁来到扶风城后，一入城，便发现了很多反常之处，整个城里都是老弱病残，一副萧条破败之景。黑夜来临，温宁刻意点灯，引来鬼影。正要将他擒获之时，一道蓝色剑光袭来，那黑影借机逃离。温宁抬眼一看，一道熟悉的身影从门外飞驰而入，正是他的旧相识，蓝氏子弟蓝思追。随后，温宁与蓝思追一起携手，经过不懈努力，二人最终解开谜团，擒住了幕后黑手，还百姓一个太平世间。