How to implement data caching and local storage in Vue projects

How to implement data caching and local storage in Vue projects

In Vue projects, we often encounter scenarios where data needs to be cached or stored locally. To improve user experience and reduce the number of network requests. In this article, I will introduce how to use Vue's plug-ins and APIs to implement data caching and local storage, and provide specific code examples.

1. Data caching

1. Use vue-ls plug-in
   vue-ls is a Vue plug-in based on localStorage encapsulation, which can help us simplify the operation of caching data. First, we need to install the vue-ls plug-in:

npm install vue-ls --save

2. Introduce vue-ls in main.js and configure it
   In the main.js file, we need to introduce vue-ls And perform basic configuration, such as setting cache expiration time, namespace, etc. The code example is as follows:

import Vue from 'vue'
import storage from 'vue-ls'

Vue.use(storage, {
  namespace: 'vuejs__', // 命名空间
  name: 'ls', // 局部名称Vue.prototype.$ls
  storage: 'local' // 存储名称：session, local, memory
})

3. Using cached data in components
   In components, we can use this.$ls to access cached data and use this.$ls.set( ) method to set the data, and use this.$ls.get() method to get the data. The code example is as follows:

export default {
  data() {
    return {
      cacheData: ''
    }
  },
  methods: {
    saveCacheData() {
      this.$ls.set('cacheData', this.cacheData)
    }
  },
  mounted() {
    this.cacheData = this.$ls.get('cacheData')
  }
}

2. Local storage of data

1. Use localStorage API
   In addition to using the vue-ls plug-in, we can also use the browser directly Provides localStorage API to implement local storage of data. The code example is as follows:

export default {
  data() {
    return {
      localData: ''
    }
  },
  methods: {
    saveLocalData() {
      localStorage.setItem('localData', JSON.stringify(this.localData))
    }
  },
  mounted() {
    this.localData = JSON.parse(localStorage.getItem('localData'))
  }
}

2. Using sessionStorage API
   Similarly, we can also use sessionStorage API to implement local storage of data, but the stored data will be deleted after the browser session ends. Automatically delete. The code example is as follows:

export default {
  data() {
    return {
      sessionData: ''
    }
  },
  methods: {
    saveSessionData() {
      sessionStorage.setItem('sessionData', JSON.stringify(this.sessionData))
    }
  },
  mounted() {
    this.sessionData = JSON.parse(sessionStorage.getItem('sessionData'))
  }
}

It should be noted that when using the localStorage and sessionStorage API, the object data needs to be converted into a JSON string for storage, and JSON parsing is performed when reading.

Summary:

In the Vue project, we can use the vue-ls plug-in or the localStorage and sessionStorage API provided by the browser to implement data caching and local storage. Different methods are suitable for different scenarios, and you can choose the appropriate method according to specific needs. Through data caching and local storage, we can improve application performance and user experience.

The above is the introduction and code examples of caching and local storage of data in the Vue project. Hope this article is helpful to you!

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