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DNS (Domain Name System), as a distributed database mapping domain names and IP addresses on the Internet, enables users to access the Internet more conveniently without remembering IP strings that can be directly read by machines.In system development, some objects cannot be accessed directly due to network or other obstacles. At this time, a proxy object can be used to access the target object. Such as calling Web services in. NET.For example, if we want to implement a JS function, Such as form validation, Then if we don't use the policy pattern in javascript described in the previous chapter to solve the form validation encapsulation code, It is a temporary form validation function written by itself. Certainly without any encapsulation, Then at this time, we will pop up a prompt to the user for whether the two values are equal. If there is a form verification on another page, their judgment method and business logic are basically the same, but the comparison parameters are different. Should we consider writing a form verification code again? So now we can consider using the template method pattern to solve this problem. Common methods are extracted, and different methods are implemented by specific subclasses. This design code also has the advantages of stronger scalability and better code ~Genitourinary system对充满少女梦幻情怀的高一女生而言，天底下最惨事之一，莫过于在开学前一天(下学期)，剪了个不能见人的失败发型。 　　新学期才开始，夏芽便陷入无底深渊，为了遮掩她的笨拙发型，竟无厘头地包头巾上学，惹来同学讪笑，但对她真正的打击是班上竟然转来一位无敌绝世大美女—欧阳语嫣，且偏偏就坐她旁边。语嫣对夏芽异常热络，而夏芽接受语嫣的主动示好，竟是因为对她同年级的美少年弟弟----欧阳累，一见钟情。 　　夏芽受邀参加累的派对，发现累的朋友全是俊男美女，不似前两端路程，游晓把车开的异常慢。* Blind a few writings, or king to, modern settings