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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.Note: The above codes are all done according to the book. They all read the code of the book. The most important thing is that we understand the implementation of the policy mode. For example, the above form verification function is the code packaged in this way. We usually use JQuery plug-in form verification code to be packaged in this way. Therefore, we can also use this method to package forms and other learning in the future.跛足老头挪着步子靠近，木讷地从吴臣手中接过食物，尹旭有拿出几分钱递了过去，说道：老人家，您拿好。It can be seen that there is no problem with the operation of the container, so nginx's service is still running in the foreground without being affected by CMD, and the newly added command (-g "daemon off;")2. 5. Artistic PerformanceL the building itself has the architectural characteristics of southern Fujian.