Vue Router Lazy-Loading routing optimization: the secret to speeding up page performance revealed

Vue Router Lazy-Loading Routing Tuning: The Secret to Accelerating Page Performance

Introduction:
When developing single-page applications using Vue.js , page performance has always been one of our focuses. Vue Router, as the officially recommended routing manager of Vue.js, plays an important role in page navigation and component loading. In order to improve page loading speed and user experience, we can use the lazy loading (Lazy-Loading) function provided by Vue Router to optimize routing.

This article will introduce the principle and usage of Vue Router lazy loading in detail, and combine it with specific code examples to help readers better understand how to speed up page performance.

1. The principle of lazy loading

In traditional routing development, all page components will be loaded at the same time when the application starts, which will cause the initial loading time of the application to change. long. With lazy loading, the corresponding component will be loaded only when the user visits the corresponding page for the first time, thus improving the page loading speed.

Vue Router uses the dynamic import (Dynamic Import) function provided by Webpack to implement lazy loading. By passing a function that returns a Promise to Webpack's import function, the corresponding module can be loaded asynchronously when needed.

2. How to use lazy loading

In order to use the lazy loading function, we need to change the component properties of the route to use dynamic import. For example, we can change the original:

import Home from './views/Home.vue';

const routes = [
  {
    path: '/',
    name: 'Home',
    component: Home
  },
  // 其他页面的路由配置
]

to:

const routes = [
  {
    path: '/',
    name: 'Home',
    component: () => import('./views/Home.vue')
  },
  // 其他页面的路由配置
]

. In this way, when the user accesses the Home page, the corresponding Home component will be loaded. Other pages can also be lazy loaded in the same way.

3. Lazy loading code example

In order to better demonstrate the effect of lazy loading, we use a simple example to demonstrate. Suppose our single-page application has three pages: Home, About, and Contact.

First, create the views folder in the project root directory, and create three component files Home.vue, About.vue and Contact.vue in this folder.

Then, introduce Vue Router in the main.js file and add the corresponding routing configuration:

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

Vue.use(VueRouter);

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

const router = new VueRouter({
  routes
});

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

In the above code, we change the components of each page to use lazy loading The way.

4. The effect of lazy loading

After the application is started, if we do not access the About and Contact pages, the components of these two pages will not be loaded. The component will only be loaded when we access the corresponding page by clicking on a link or manually entering the address.

Such a lazy loading method can significantly reduce the initial loading time and improve page performance and user experience.

Conclusion:
By using the lazy loading function of Vue Router, we can implement on-demand loading in single-page applications, thereby improving page performance and user experience. This article introduces the principle and specific usage of lazy loading, and provides code examples to help readers better understand the implementation of lazy loading.

I hope this article can be helpful to readers. The secret to speeding up page performance has been revealed! Let's build excellent single-page applications in Vue.js development together.

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