B / S structure (Browser / server mode, browser / server mode) is a new network structure mode after the appearance of Internet. Web browser is the most commonly used application software for clients [9]. B / S mode releases the client and concentrates the main functions of the system on the server, thus reducing the burden of the client. Users only need to install browser on the client, such as B. ie, Firefox, etc. The server will install the database, such as Oracle, Informix, SQL server. Users interact with data through browsers and databases.<br>The main advantage of B / S is that as long as users have a computer that can access the Internet, they can use the system anytime and anywhere without installing any software. Customers do not need to install and maintain, and scalability is improved.<br>In recent years, with the rapid development of Ajax technology, more and more systems based on B / S structure have been created. The program based on it can perform some validation functions on the client to reduce the load on the server. Local instant update improves interactivity.<br>
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