By setting cookie, we can save some data (such as user name, shopping cart content, etc.) in the user's browser, and the browser will automatically carry these data the next time the user visits the same website, thus realizing data persistence and cross-page transmission.
In Web development, we often need to transfer data between different pages. For example, after a user logs in, we need to identify the user in the subsequent pages.
At this point, we can save the user information in a cookie and read it when each page loads. In this way, we can always identify the identity of users when they browse different pages, thus realizing personalized service.
Cookie are set and obtained mainly through JavaScript codes on server and client. On the server side, we can use various programming languages (such as PHP and Java) to set cookie.
The role of cookie:
1, user session management: cookie play a central role in Web development, which allows the server to identify and track user status. For example, when a user logs on to a website, the server can set a cookie containing authentication information to keep the user logged on when browsing different pages, without having to re-enter the user name and password in each request.
2. Personalized experience provision: cookie can help websites realize personalized user experience by storing users' preferences or browsing history. For example, adjust website layout and content recommendation according to users' reading habits, language preferences or theme selection, so as to improve user satisfaction and website stickiness.
Above content reference: Baidu Encyclopedia -cookie