1. What is the front and back end development
Front-end development: generally refers to the Web front-end development, namely the development of the site front page (ie web page) is. Simply put, the front end of the site engineer in charge of the site user-visible content development, such as the effects on the page, the page layout, images and video. Front-end engineers work site content is the graphic design renderings designed as a web browser can run, and back-end development engineers and cooperate, do web data display and interaction.
Back-end development: the back-end development, design and implementation of the logic behind the general in charge of the site, as well as save data of the user and the website and read. For example, front-end implementation of the login page, when a user enters the account number and password and click "Login" button, in fact, the tip has completed his event, and then return is to wait for back-end account and password verification result, according to this front end check results show a successful login, account number or password errors message.
2. The front and rear ends in order to develop
In the actual project development, front / back-end development is carried out in parallel, key among them is able to parallel interface documentation, front / back-end developers have to do things based interface documentation corresponding to each.
3. The front page has done "optional" to determine why the interface needs to be done optional parameter check
This is not superfluous, but double protection. In general, for verification, front / back-end parameters are required to do. Do check the front, on the one hand to the user-friendly tips; on the other hand is the most direct protection systems, reducing the request for the back end. And do check the back-end, on the one hand, if the front does not do protection, the back end will not wrong; on the other hand (and most important), if the user requests to bypass the front-end interface to directly call it will not go wrong.
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