Reveal the main uses of localstorage: What convenience does it bring us?

The main purpose of localstorage is revealed: What conveniences does it provide us?

In modern web development, front-end developers often need to store some data so that the state of the data remains after the user closes the page. To solve this problem, HTML5 introduced a very useful feature: localstorage. It is an API that persistently stores data in the user's browser. It provides a convenient operation interface so that developers can easily store data on the front end.

So, what specific conveniences does localstorage provide? Let’s learn about them one by one.

1. persistent data
   One of the biggest advantages of localstorage is that it can persist data in the user's browser. Unlike sessionStorage, the data stored in localstorage still exists after the user closes the page or even closes the browser. This means that we can still access the previously stored data the next time the user visits our website, providing a better experience for the user.

Sample code:

// 存储数据
localStorage.setItem("username", "John");

// 获取数据
const username = localStorage.getItem("username");

// 删除数据
localStorage.removeItem("username");

2. Multi-tab sharing data
   For browsers that support multiple tabs, localstorage data can be shared between different tabs shared. This is because localstorage is based on the browser domain name, not individual tabs. This means that we can update the data in localstorage in one tab, and other tabs can immediately access the latest data.

Sample code:

// 在一个标签页存储数据
localStorage.setItem("count", 10);

// 在另一个标签页读取数据
const count = localStorage.getItem("count");

3. Mass storage
   Compared with cookies, localstorage can store a larger capacity of data. Cookie sizes are typically limited to a few KB to a few MB, while localstorage size limits can reach larger tens of MB. This makes localstorage an ideal choice for storing large amounts of data, such as saving user configuration information, history, etc.

Sample code:

// 存储大量数据
localStorage.setItem("largeData", JSON.stringify(largeData));

// 获取大量数据
const largeData = JSON.parse(localStorage.getItem("largeData"));

4. Asynchronous operation
   The operation of localstorage is asynchronous and will not block the loading and rendering of the page. This means that we can perform read and write operations on localstorage at the same time when the page is loading, without worrying about blocking user operations. This is especially important for applications that require heavy read and write operations.

Sample code:

// 异步存储数据
localStorage.setItem("data", "Hello", () => {
  // 存储完成后执行的回调函数
});

// 异步获取数据
localStorage.getItem("data", (value) => {
  // 获取到数据后执行的回调函数
});

Summary:
localstorage is a very useful feature that provides developers with a convenient front-end data storage solution. Through features such as persistent data storage, multi-tab data sharing, large-capacity storage, and asynchronous operations, localstorage makes front-end development simpler and more efficient. We can make full use of it to improve user experience and provide users with better web applications.

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