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荡平四海。胡镇眼睛都红了，死死地瞪着板栗，却碍于洪霖，竭力忍耐。Article 21 Definitions一瞬间，尹旭明白过来，刘邦或者说张良的意思是进攻秦国都城所在的关中。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: