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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:少女看着花瓣在流水之中打着转，最终被淹没。田夫子听完，巨大喜悦压过了仇恨，老泪纵横，喃喃道：不是她生的。Many people like to say, "If I had money, I would do better than Jack Ma." "If I had money, I would definitely be better than Wang Sicong."我现在就去看看，我们等会儿再聊。The answer is simple: try to digest all these requests. There are 300 people coming to the 30-person restaurant, so find ways to expand the restaurant (such as renting another facade temporarily and hiring some chefs) so that 300 people can sit down, then the normal users will not be affected. For the website, it is to expand rapidly in a short period of time, providing several times or dozens of times of bandwidth to withstand heavy traffic requests. This is why cloud service providers can provide protection products because they have a large amount of redundant bandwidth that can be used to digest DDOS attacks.