How to use Vue's asynchronous components and Webpack Code Splitting to improve application performance

How to use Vue's asynchronous components and Webpack Code Splitting to improve application performance

Introduction:
As web applications become more and more complex, page loading speed and performance have become the focus of developers. In order to improve the performance of the application, we can take advantage of Vue's asynchronous components and Webpack's Code Splitting function. These two features combined can help us reduce page loading time and improve user experience. This article will introduce how to use Vue's asynchronous components and Webpack's Code Splitting to optimize your application.

1. What is an asynchronous component
Vue’s asynchronous component means that we can package a component separately and load it when needed. This reduces the initial load time of the page to a minimum.

2. Why use asynchronous components
When we package all components together, the page loading time will be very long. By using asynchronous components, we can split the components required for the initial rendering of the page and load only the parts required for the current page, which can improve page loading speed.

3. How to use asynchronous components
In Vue, we can use the import() syntax to load asynchronous components. For example, here is an example:

import Loading from './components/Loading.vue'
const Home = () => import('./views/Home.vue')
const About = () => import('./views/About.vue')
const Contact = () => import('./views/Contact.vue')

Vue.component('loading', Loading)

const router = new VueRouter({
  routes: [
    { path: '/', component: Home },
    { path: '/about', component: About },
    { path: '/contact', component: Contact }
  ]
})

new Vue({
  router,
  render: h => h(App),
}).$mount('#app')

In the above code, we use import() to import our async component. Vue will automatically load imported components asynchronously and render them when needed.

4. Code Splitting function of Webpack
Webpack is a powerful module packaging tool. It can be used to implement Code Splitting, dividing the code into smaller chunks and loading them only when needed.

5. Why use Webpack's Code Splitting
If we package all the code together, it will cause the entire application file to be too large and the loading time to be too long. By using Webpack's Code Splitting feature, we can split the code into multiple chunks and load them only when needed.

6. How to use Code Splitting of Webpack
In Webpack, we can use require.ensure or import() to implement Code Splitting. For example, the following is an example:

import Vue from 'vue'
import VueRouter from 'vue-router'

import App from './App.vue'

Vue.use(VueRouter)

Vue.component('loading', () => import('./components/Loading.vue'))

const router = new VueRouter({
  routes: [
    { path: '/', component: () => import('./views/Home.vue') },
    { path: '/about', component: () => import('./views/About.vue') },
    { path: '/contact', component: () => import('./views/Contact.vue') }
  ]
})

new Vue({
  router,
  render: h => h(App),
}).$mount('#app')

In the above code, we use import() to load components asynchronously to achieve the effect of Code Splitting.

7. Summary
By using Vue’s asynchronous components and Webpack’s Code Splitting function, we can greatly improve the performance of the application. Asynchronous components can reduce initial load time, while Code Splitting can split code into smaller chunks and load them only when needed. The combination of these two functions can help us optimize application performance and improve user experience.

Reference:

• Vue Async Components: https://vuejs.org/v2/guide/components-dynamic-async.html
• Webpack Code Splitting : https://webpack.js.org/guides/code-splitting/

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