What does sessionstorage do?

sessionstorage functions: 1. Temporarily store user data, which can improve user privacy protection and reduce the burden on the server; 2. Transfer data between different pages. This method can easily Transfer data between different pages without using URL parameters or global variables; 3. Cache data and store some commonly used data on the client to reduce requests to the server; 4. Optimize user experience, reduce user operations, and improve User satisfaction; 5. Cooperation with LocalStorage, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

SessionStorage is a web storage mechanism in HTML5 that allows data to be stored during a browser session. SessionStorage provides a way to temporarily store data in the browser, which will be cleared after the user closes the browser window. SessionStorage is mainly used in the following aspects:

1. Temporary storage of user data: SessionStorage can be used to store users' temporary data on the website, such as form data, user settings, and browsing history. wait. Unlike cookies, SessionStorage data is not sent to the server and is only saved on the browser side. This can improve user privacy protection and also reduce the burden on the server.

2. Pass data between different pages: SessionStorage can share data between different pages in the same browser window. When the user stores data in SessionStorage on one page, other pages can obtain the data by accessing the same SessionStorage object. This method makes it easy to pass data between different pages without using URL parameters or global variables.

3. Cache data: SessionStorage can be used as a temporary cache to store some commonly used data on the client to reduce requests to the server. For example, in an e-commerce website, common data such as product lists and user information can be stored in SessionStorage. Users can obtain these data directly from SessionStorage when browsing different pages, which reduces the number of requests to the server and improves the efficiency of the website. performance.

4. Optimize user experience: SessionStorage can be used to provide a better user experience. For example, in a multi-step form, after the user fills in some data, the data can be stored in SessionStorage. When the user refreshes the page or returns to the previous step, the previously filled in data can be restored from SessionStorage to avoid the need for the user to fill it in again. This can reduce user operations and improve user satisfaction.

5. Use with LocalStorage: SessionStorage and LocalStorage are two different web storage mechanisms. Their functions are somewhat similar, but there are also some differences. LocalStorage is a persistent storage mechanism, and the data will always be saved in the browser, even if the user closes the browser window. SessionStorage is a temporary storage mechanism, and the data is only valid during the browser session. In actual applications, you can choose to use SessionStorage or LocalStorage according to your needs, or use both together.

It should be noted that the data of SessionStorage is based on the domain name, that is, different pages under the same domain name can share the data in SessionStorage, but pages under different domain names cannot be shared. In addition, the data size of SessionStorage is usually limited to around 5MB, and the specific limit varies by browser.

Summary

SessionStorage is a Web storage mechanism in HTML5. It is mainly used to temporarily store user data, transfer data between different pages, cache data, and optimize User experience, etc. It can provide a better user experience, reduce requests to the server, and also facilitate developers to store and transfer data.

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