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为今，集浙江、福建二十万大军，由俞将军总兵讨贼，方可速取。ChannelId说着话，就到了池塘中间，两条船都停住，少年们也收了橹，动手采菱角和莲蓬。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: