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3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.Disadvantages:就是一时差些什么，我们难道不会去找板栗帮忙？方夫人白了他一眼道：你们是去念书，还能有多少事？一个老汉洒扫看门，一个婆子洗衣煮饭，再一个小子跟着跑腿，净够了。他们斗他们的争执，杨长帆搞杨长帆的东海南洋，没必要拱火。First, create a common interface between the two: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.