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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:这时人多车多，有来有往的，十分不好走，就没那么快了。《山河》的故事发生在1999年的一个秋天，地点选在山西煤矿地区，赵涛饰演的女主角是一名小学老师，他和一个煤矿工作者相爱，但很快分手，嫁给了煤矿主，从此前男友远走他乡。据汪村一个庄汉说，早在去年十月，他曾看见董小翠跟一个陌生男子在村东地头大树底下悄声说话，看情形不像个书生A. Men: Sailing 470, Sailing Finn, Windsurfing Mie;赵得柱已经彻底惊住了。顾小玉收藏了启明后，想了想，又注册了一个账号——用户名是小玉玉玉啊。