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Note:? Node.js is cached according to the actual file name, not the parameters provided by request (), which means that even if you load it twice through requirement ('express') and requirement ('https://blog.csdn.net/arsaycode/article/details/node_modules/express'), it will not be loaded again, because although the two parameters are different, the file parsed to is the same.Although the worry of a "point" is small, when it enters the daily life of more than 15 million ethnic minority compatriots, it becomes a big issue related to ethnic harmony.局长，你把银行劫案的事情说给他是想声东击西吧？金队长，想向你了解些事情。剑越来越近了。From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code://and B methods; Method A and method B write specific business logic in subclasses in turn.