Data caching and local storage experience sharing in Vue project development

In the development process of Vue project, data caching and local storage are two very important concepts . Data caching can improve application performance, while local storage can achieve persistent storage of data. In this article, I will share some experiences and practices in using data caching and local storage in Vue projects.

1. Data caching

Data caching is to store data in memory for subsequent quick acquisition and use. In Vue projects, there are two commonly used data caching methods: Vuex and component-level caching.

1. Vuex cache

Vuex is the officially recommended state management library for Vue.js, which can be used to centrally manage and share the state of all components of the application. Sharing and responsive updates of global state can be achieved using Vuex.

In Vue projects, sometimes we need to cache certain data for sharing between multiple components. At this time, data caching can be achieved through Vuex. Define a module in Vuex, and then obtain the cached data through this.$store.state.xxx in the component that needs to access the data.

2. Component-level caching

In addition to using Vuex for data caching, we can also use caching at the component level. Vue provides <keep-alive></keep-alive> components, which are used to cache components that have been rendered so that they can be directly reused in subsequent uses, thereby improving application performance. It should be noted that the component wrapped by <keep-alive></keep-alive> must have a unique key value.

For example, in a head navigation component, we hope to keep the navigation selected when switching pages. At this time, we can use <keep-alive></keep-alive> to cache the navigation. component so that the state remains unchanged.

2. Local Storage

Local storage refers to saving data locally on the client so that it can be quickly obtained and used during the next visit. In the Vue project, there are two commonly used local storage methods: Cookies and Web Storage.

1. Cookie

Cookie is a small storage method that can store a small amount of data. In the Vue project, we can use the third-party library js-cookie to operate Cookies. Data can be stored in Cookie through Cookies.set(key, value), and data in Cookie can be obtained through Cookies.get(key).

It should be noted that cookies have some limitations, such as certain limitations on the size and quantity of stored data.

2. Web Storage

Web Storage is a mechanism for storing data in the browser, including localStorage and sessionStorage. localStorage is a kind of persistent storage, that is, the data will be retained after closing the browser; and sessionStorage is a kind of session-level storage, that is, the data will be cleared after closing the browser.

In the Vue project, we can use window.localStorage and window.sessionStorage to perform Web Storage operations. Data can be stored in localStorage through localStorage.setItem(key, value), and data in localStorage can be obtained through localStorage.getItem(key).

It should be noted that Web Storage has a relatively large data storage capacity and can store a large amount of data. However, due to browser limitations, the data stored under the same domain name cannot exceed a certain size.

3. Selection of data caching and local storage

In actual projects, we need to choose appropriate data caching and local storage methods based on specific needs. If you only need to store a small amount of data, you can use Cookies; if you need to store a large amount of data and need to share it between multiple components or pages, you can use Vuex for data caching; if you need to store the data persistently, you can use localStorage .

Summary:

In Vue project development, data caching and local storage are very important concepts. Proper use of data caching and local storage can improve application performance and user experience. By using Vuex for data caching and Cookies or Web Storage for local storage, we can better manage and use data. I hope the experience and practice in this article will be helpful to the development of Vue projects.

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