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This is why require is not defined in the app.js file, but this method exists. As can be seen from Node.js API documentation, there are,,, and several undefined but existing variables. Which is passed in after parsing in the process of finding the file path. The variable is the module object itself and is an empty object ({}, not null) initialized in the module's constructor. ?玉米快撑不住了，手臂微微颤抖，心里大骂：日你祖宗。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu朕是不会上当的。日本小学的问题日益严重，包括学习成绩下降、暴力事件以及学生没有朝气等，此次江口将挑战做一名热血校长！他饰演的主角是一位承包商，二十年来一直尽心工作，一天他为了和恩师的约定，回到面临倒闭的母校，成了一个没有任何教育经验的校长，尽管没有经验，但是他用激情与认真做武器，通过其行动力、积极向上的态度以及突发奇想让学校重新精神焕发。我当时被那猎户救回去的时候，是穿着靖军服饰的，她应该是不想帮我治吧。肃王爷看看郑老太太和刘云岚，出奇地没再说话。