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TCP works in the Transport layer, IP in the Network layer, and ARP in the DataLink layer; The data on the second layer is called Frame, the data on the third layer is called Packet, and the data on the fourth layer is called Segment. At the same time, we need to simply know that when data is sent from the application layer, header information will be added to each layer, encapsulated, and then sent to the data receiving end. This basic process you need to know, that is, every data will go through the process of data encapsulation and unencapsulation.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 ~State Mode: Simple Edition家人和朋友的再会。顺利进行的葬礼。Why is it so important to simply divide three categories?Finally, a Light.prototype.setState method is provided, through which the state object can switch the state of the light object. The switching rules of states are well defined in each state class in advance. No more conditional branch statements related to state switching can be found in Context:马可爱之父马东山、韩冰之父韩德昌、宋天明，号称豪森“三驾马车”，当年三兄弟创立“豪森酒店”。30年过后，马东山年老多病，韩德昌早死，而宋天明早年丢失了儿子。所以，董事长马东山生病之后，提出让马可爱来作为酒店继承人。与此同时远在国外的马可爱却遭遇了一场交通意外，濒死之后被告知父亲心脏病发作，马可爱急忙赶回国内，在经历了一系列事故之后，马可爱隐隐觉得，一连串事故背后，隐藏着巨大的谜团。为了解开谜团，她决定接受父辈的酒店，谁想到有更多阴谋和危险在等待着她，而勇敢的马可爱和夏雨行一起挫败了宋天明在酒店布下的种种阴谋，拯救了自己的家人，同时也收获了自己的爱情。