What are the js caching mechanisms?

js caching mechanisms include local storage, cache API, memory storage, IndexedDB, Service Workers, etc. Detailed introduction: 1. Local storage is a persistent storage mechanism that can store data in the user's browser. It is a key-value pair storage system that can be accessed through "setItem()" and "getItem()" Methods to add, obtain and delete data; 2. Cache API is a JavaScript API used to manage and operate HTTP cache and so on.

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

JavaScript caching mechanisms mainly include the following:

1. Local Storage (Local Storage): Local Storage is a persistent storage mechanism that can store data in the user's browser . It is a key-value pair storage system that can add, get and delete data through setItem() and getItem() methods. Local Storage can be used to cache user login information, website configuration information, etc.

2. Cache API: Cache API is a JavaScript API used to manage and operate HTTP cache. It allows developers to create cache objects and perform operations on them, such as adding, getting, updating, and deleting resources. The Cache API can be used to cache the results of network requests to improve application performance and responsiveness.

3. Memory Storage: Web Workers allow developers to create background threads in the browser, and these background threads can use SharedArrayBuffer and Atomics API to share the memory in the main thread. Developers can store data in a SharedArrayBuffer and use the Atomics API to ensure data consistency when accessed by multiple threads. This memory storage mechanism can be used to cache large amounts of data to improve application performance.

4. IndexedDB: IndexedDB is a persistent storage mechanism that can be used to store large amounts of structured data, including files/binary objects. IndexedDB supports transactions and ACID operations, and multiple databases can be created in the browser. Each database can contain multiple object storage spaces and indexes. Developers can store data in IndexedDB and read it out when needed.

5. Service Workers: Service Workers are a script that runs in the background of the browser. It can intercept and process network requests and provide offline caching functions. Service Workers can be registered on a specific origin or path and use the Cache API to manage and operate caches. Developers can cache resources into Service Workers so they can be accessed when offline.

These JavaScript caching mechanisms can help developers improve application performance and responsiveness and reduce dependence on web servers. However, in actual applications, it is necessary to select an appropriate caching mechanism based on specific needs and situations, and pay attention to issues such as cache consistency and update strategies to ensure data accuracy and reliability. At the same time, compatibility issues between different browsers and devices also need to be considered to ensure that the application can run properly in various environments.

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