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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:So the result is? [3, NaN, 3]杨贼。葫芦眼角余光瞥见，顿时魂飞魄散——这要是被踢中了，四弟准没命。Black line: jiuxiong* …没有做到活要见人，死要见尸，范鄂林总有些不大放心。