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We can see the above code. The code for creating div is very similar to the code for creating iframe. We can now consider separating the common code to make the code completely abstract. We can now write a set of code that is encapsulated in the getInstance function, as follows:Re-understanding OO: Object-oriented programming is an idea to think about software design structure with object-oriented thinking, thus strengthening the object-oriented programming paradigm. Object-oriented features are encapsulation, inheritance and polymorphism. "Do these count?" . So from that beginning, when I design a class, I keep reminding myself of the following three points:Previously, we compared the operation of checking IPTables rules to "check" in "add, delete, change and check". In this article, we will talk about how to "add, delete and change" IPTables.By writing poems, he forced himself to come up with a large number of other different words, which he usually did not think of.他一把掐住她脖子，她就一低头咬住他手腕。　　本剧改编自2005年播出的同名日剧。