How is lazy loading of routes implemented in Vue Router?

How is lazy loading of routes implemented in Vue Router?

In Vue development, we usually use Vue Router to implement jumps and routing control between pages. When the project becomes large, we may have many routing pages to load, which will cause the entire project to load slowly. In order to improve the performance of the project, Vue Router provides a mechanism for lazy loading of routes.

Route lazy loading means that the routing page will be loaded only when it is accessed, instead of loading all routing pages when the application is initialized. This reduces initial loading time and improves user experience. Lazy loading of routes in Vue Router is implemented by dynamically importing components.

First, we need to use Vue’s asynchronous import function to implement dynamic import of components. Vue provides the import() function, which returns a Promise object. After the Promise object is resolved, the requested component will be imported.

The following is an example that demonstrates how to use the import() function to implement dynamic import of components:

const Home = () => import('./views/Home.vue')
const About = () => import('./views/About.vue')

In the above code, Home and About are components dynamically imported through the import() function. When these components are accessed, they are loaded and rendered into the corresponding routing page.

Next, we need to modify the routing configuration of Vue Router and change the component import method to dynamic import. In the routing configuration, we pass a function to the component property instead of passing the component reference directly. In this function, we use the import() function to dynamically import the component.

The following is an example that demonstrates how to use dynamic import to implement lazy loading of routes:

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

Vue.use(VueRouter)

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

In the above code, Home and About are routed The component returns the result of the dynamic import of the import() function through the arrow function.

Through the above steps, we have implemented lazy loading of routes in Vue Router. When the corresponding routing page is accessed, the components will be dynamically imported and rendered, thereby improving the loading speed and performance of the application.

To summarize, Vue Router's lazy loading of routes is implemented by dynamically importing components. We use the import() function to import the component and use it as an asynchronous component. This approach can reduce page loading time and improve user experience.

I hope that through the introduction of this article, you will have a basic understanding of lazy loading of routes in Vue Router and be able to use it flexibly in actual projects.

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