Appium automation test foundation -- supplement: c/s architecture and b/s architecture description

1、C/S The architecture and B/S Architecture concept

（1）C/S framework
C/S Architecture is Client/Server( The client / The server ) structure , Is a well-known software system architecture .
By properly assigning tasks to Client End sum Server End , Reduce the communication cost of the system , We can make full use of the advantages of both hardware environments .
Early software systems used this as the preferred design standard .
（2）B/S framework
B/S Architecture is Browser/Server( browser / The server ) structure , With Internet The rise of Technology , Yes C/S A change or improved structure of architecture .
Under this structure , The user interface is completely through WWW Browser implementation , Part of the transaction logic is implemented in the front end , But the main transaction logic is implemented on the server side , Form what is called Three layer architecture structure .
B/S The architecture mainly utilizes the WWW Browser technology , Combined with a variety of browser Script Language (VBScript、JavaScript…) and ActiveX technology , With a general browser to achieve the original need for complex special software to achieve a powerful function , And save the development cost , Is a new software system construction technology .
B/S Architecture has become the preferred architecture of today's application software .

2、C/S Structure and B/S The difference in Architecture ：

Client/Server It's based on LAN .
Browser/Server It's based on the wan .

1. The hardware environment is different :：
   C/S The architecture is usually built on a dedicated network , Small scale network environment , The LAN provides connection and data exchange services through special servers .
   B/S The architecture is based on the WAN ,, It doesn't have to be a dedicated network hardware environment , And information is managed by itself . Than C/S The architecture has a stronger adaptability , Generally, as long as there is an operating system and a browser .
2. Different safety requirements ：
   C/S The architecture is generally oriented to relatively fixed user groups , Strong control over information security . General highly confidential information system adopts C/S Appropriate architecture , Can pass B/S The architecture release part can disclose information .
   B/S The architecture is built on the wan , The ability to control security is relatively weak , Facing the unknown user group .
3. Different program architecture ：
   C/S Architected programs can be more process oriented , You can check permissions at multiple levels , Less consideration can be given to the running speed of the system .
   B/S The architecture of the program focuses on multiple considerations of security and access speed , Based on the need for more optimization . Than C/S Architecture has higher requirements .
   B/S The process of architecture is the development trend , The introduction of some new technologies , send B/S The architecture is more mature .
4. Software reuse is different ：
   C/S An architected program may not consider integrity ,, The reusability of the program is not as good as that in B/S The program requirements of the architecture are high .
   B/S The structured program focuses on multiple structures , Components are required to have relatively independent functional modules , It can be reused relatively well .
5. System maintenance is different ：
   System maintenance is an important part of software life cycle , And it costs a lot .
   C/S The upgrading and maintenance of the architecture program must be examined as a whole , It will be very difficult to deal with problems and system upgrades , Sometimes it may be to build a new system . Users also need to download, install and upgrade from the Internet .
   B/S The architecture program is basically composed of modules with different functions , If a module has problems or needs to be upgraded , Maintaining the module alone can , The cost of system maintenance and upgrade can be minimized .
6. Dealing with problems is different ：
   C/S The framework of the program is relatively fixed for people , And deal with problems in the same area , High safety requirements , It is related to the operating system version .
   B/S The program of the architecture is built on the WAN , For different user groups , This is a C/S Architected programs cannot do , Minimal relevance to the operating system platform .
7. The user interface is different ：
   C/S The procedures of architecture are mostly established Window On the platform , There are limited ways of expression , Generally speaking, the requirements for programmers are high .
   B/S The architecture of the software is built on the browser ,, There are richer and more vivid ways of expression , Communicate with users . And most of the development difficulties are reduced , Reduce development costs .
8. The flow of information is different ：
   C/S The process of architecture is typically centralized and mechanical ,, Relatively low interactivity .
   B/S The flow of program information of the architecture can change , Such as ： E-commerce between enterprises (B-B Pattern ), E-commerce between enterprises and consumers (B-C Pattern ) , E-commerce between enterprises and governments (B-G Pattern ) etc. , The change of information flow is more like a trading center .

3、C/S The architecture and B/S Architecture advantages and disadvantages

（1）B/S Advantages and disadvantages of the model :
B/S Advantages of structure :

1. It has the characteristics of distribution , You can query anytime, anywhere 、 Browsing and other business processing .
2. Business expansion is simple and convenient , By adding pages, you can add server functions .
3. Upgrading and maintenance are simple and convenient , Just change the page , All users can update synchronously .

B/S Disadvantages of patterns :

1. The response speed is not as fast as C/S framework , With AJAX Technological development , Compared with tradition B/S The speed of architecture software is doubled .
2. The interface and refresh mechanism are slightly different between different browsers , Sometimes you need to design the interface separately according to different browsers . But with the development of Technology ,B/S Architecture software user experience effect and C/S The software of the architecture is not much different .

（2）C/S Advantages and disadvantages of the model
C/S The advantages of patterns :

1. Because the client realizes the direct connection with the server , There is no middle link , So the response speed is faster .
2. C/S The structured management information system has strong transaction processing ability .
3. The system has high stability and security .

C/S Disadvantages of patterns ：

1. LAN only .
   With the rapid development of the Internet , Mobile office and distributed office are becoming more and more popular , This requires our system to be scalable .
   Remote access requires specialized technology , At the same time, the system should be specially designed to deal with distributed data .
2. The client needs to install special client software .
   First, it involves the workload of installation , Secondly, any computer has a problem , Like a virus 、 Hardware damage , All need to be installed or maintained .
   There are also system software upgrades , Each client needs to be reinstalled , Its maintenance and upgrade costs are very high .、
3. There are also restrictions on the operating system of the client .
   May be adapted to Win7 System , But not for win8 System or Windows10 System ,
   Or not applicable to Microsoft's new operating system, etc , Say nothing of Linux、Unix etc. .

a key ： Supporting learning materials and video teaching

So here I have carefully prepared the detailed information of the above outline in The link below is as follows