How does the front-end vue project store data locally?

In the process of front-end development, data storage has always been a relatively important issue. In order to improve user experience, we need to make data analysis more flexible while ensuring fluency and security. Therefore, from a front-end perspective, the choice of data storage has also become particularly important.

For front-end developers, Vue is a very excellent and popular framework. Vue has the advantages of responsiveness, ease of use, and performance. Therefore, in development, we often use Vue to implement front-end data storage solutions. In this article, I will explain how to implement a solution to store data locally in Vue.

1. Introducing local storage

Before implementing the front-end data storage solution, we need to first understand the concept of local storage. Local storage refers to data saved on the client browser, including localStorage and sessionStorage.

LocalStorage and sessionStorage are both W3C specifications provided by HTML5. They all have their own life cycle and scope, and can be used to store data in string format without worrying about data loss. One of the more common scenarios for these two storage methods is local caching, which can store some infrequently changing data locally for next time use.

2. Storing data locally

In Vue, we can implement the solution of storing data locally through Vue methods and components. The following mainly introduces localStorage and sessionStorage.

2.1 localStorage

localStorage is a global variable. You can use localStorage.setItem(key, value) to set the value and use localStorage.getItem(key) to get the value. In Vue, we can store it through $localStorage of the vue instantiated object. The code is as follows:

//main.js中引入vue-ls
import VueLs from 'vue-ls'
//注册localStorage
Vue.use(VueLs)
//在组件中进行数据存储
this.$ls.set('key', 'value');
//取值
this.$ls.get('key');

VueLs is a plug-in specially used to encapsulate localStorage and sessionStorage in Vue, in main.js After referencing, we can use $ls in the component to operate localStorage. The way it is implemented is to add a $ls attribute on Vue.prototype, which has set() and get() methods.

2.2 sessionStorage

Like localStorage, sessionStorage is also a global variable. Its usage is basically the same as localStorage, except that the sessionStorage data will be cleared after the session ends. In Vue, we can also use vue-ls to encapsulate sessionStorage.

//main.js中注册sessionStorage
Vue.use(VueLs,{
  storage: 'session'
})
//在组件中进行数据存储
this.$session.set('key', 'value');
//取值
this.$session.get('key');

As can be seen from the above code, the way to store data in sessionStorage is very similar to that of localStorage. The only difference is that the storage is specified as 'session' when registering, so that the data will be automatically stored in sessionStorage.

3. Notes

In the process of storing data locally, we need to pay attention to the following two points:

3.1 Security

When storing sensitive information on the front end, security issues need to be considered. If sensitive information is accidentally stored locally, the information can be maliciously obtained, causing harm. You can consider writing an encryption method to convert plain text into cipher text for storage; or fields containing sensitive information are not stored in the memory and are only obtained by directly calling the interface when using them.

3.2 Frequent reading and writing

In front-end storage, frequent reading and writing operations will affect the performance of the entire system. If we need to operate on data frequently, we need to use other technologies to replace local storage. For example, for frequently updated data, a file or database can be used instead of localStorage and sessionStorage.

In short, when using localStorage and sessionStorage, we need to have a deep understanding of their advantages and disadvantages and consider their impact on the system. We should choose this storage method only when security and performance are not issues.

4. Summary

This article introduces how to store data locally in Vue. We can use storage methods such as localStorage and sessionStorage. However, we also need to pay attention to security and performance issues.

When we need to choose a reliable, safe, and commonly used storage method during the development process, localStorage and sessionStorage are good choices. If the data that needs to be stored is large or requires frequent operations, you can also consider other ways to store the data.

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