Why use localStorage

Reasons for using localStorage: 1. Persistent data; 2. Support multiple data types; 3. Larger storage space; 4. Higher security; 5. Cross-domain access; 6. Convenient and fast . Detailed introduction: 1. Persistent data. The data in localStorage will not be lost due to page refresh or closing. It can store data persistently so that users can access these data between multiple browser sessions; 2. Support Multiple data types, unlike Cookies which can only store strings and so on.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

The main reasons for using localStorage are as follows:

1. Persistent data: The data in localStorage will not change due to page refresh or Lost when closed, it stores data persistently so that users can access it across multiple browser sessions.

2. Support multiple data types: Unlike Cookie which can only store strings, localStorage can store various data types, including strings, numbers, Boolean values, objects and arrays, etc. . This allows us to store and manipulate data more flexibly.

3. Larger storage space: Compared with the 4K limit of Cookie, localStorage has a larger storage space, which can reach 5MB, which allows us to store more data.

4. Higher security: Because localStorage data is stored in the user's browser rather than on the server side, it is more secure than Cookie. In some cases, the use of cookies may lead to data leakage or tampering. LocalStorage can avoid these problems.

5. Cross-domain access: localStorage is an API provided by the browser, so it can share data between different domains. This is very useful for some scenarios that require cross-domain access.

6. Convenient and fast: It is very convenient to use localStorage. You only need to call a few simple APIs to complete the storage and reading of data. This allows developers to develop applications faster.

It should be noted that although localStorage has many advantages, it also has some limitations and disadvantages. For example, it may be affected by browser restrictions and security policies, or there may be insufficient storage space. Therefore, its suitability and security need to be carefully considered when using localStorage.

Cookie and LocalStorage differ in the following aspects:

1. Storage size: The maximum storage of a single cookie is 4k. If it is greater than 4k, The storage fails and the corresponding cookie information cannot be found in the browser; the maximum storage capacity of LocalStorage is 5m. If it is greater than this maximum limit, the browser prompts an error.

2. Validity period: Cookie is session-level storage by default (coexisting with the tab page), and the expiration time can be set; LocalStorage is persistent storage unless it is cleared automatically.

3. Operability: Cookie not only stores data, but also has many other attributes for its operation and setting. For example, Domain and Path together determine the scope of the cookie. Secure If set to true, the cookie can only be sent to the server using the https protocol; LocalStorage only stores data.

4. Portability: Cookie will be carried when requesting, but LocalStorage will not. Cookie information from the same origin will be automatically sent to the server as part of the request header. If too many cookies are set, it will increase the communication load. LocalStorage does not have this problem, it will always exist on the browser side.

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