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Recently, I have made a preliminary investigation on DDOS attacks, and have some superficial understanding of the causes of DDOS attacks and their detection and defense mechanisms. This paper focuses on some thoughts on DDOS attacks in metropolitan area network environment under traditional network architecture.Interpreter Pattern: Given a language, the interpreter pattern can define a representation of its grammar and provide an interpreter at the same time. Clients can use this interpreter to interpret sentences in this language. The interpreter pattern will describe how to interpret these statements using pattern design after having a simple grammar. The language mentioned in the interpreter mode refers to any combination that any interpreter object can interpret. In the interpreter mode, a hierarchical structure of command classes representing grammar needs to be defined, that is, a series of combination rules. Each command object has an interpretation method, which represents the interpretation of the command object. Any permutation and combination of objects in the hierarchy of command objects is a language.The jQuery event handling method is the core function in jQuery.The slot function code for the clicked () signal of the Read Current DateTime button is as follows:(2) Add Synchronous LockHowever, for death caused by chronic diseases or aging, the course has certain regularity, in which some signs of death can be identified and some can be perceived by oneself.What is celebrity endorsement? The so-called celebrity endorsement refers to a marketing tool that uses the plane portraits or videos of celebrities and stars to make the terminal audience of products widely known through a series of publicity carriers. At present, it has been widely accepted by various industries and business owners. I. Selection of spokesmen around brand personality and product positioning