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How to optimize page loading speed and performance in Vue projects

王林

Oct 15, 2023 pm 03:55 PM

data cachinglazy loadingcode splitting

How to optimize page loading speed and performance in Vue projects

With the popularity of Vue.js in front-end development, we are likely to encounter page loading speed Slowness and performance issues. In Vue projects, optimizing page loading speed and performance is a very important task. The following will introduce some practical tips that can improve the loading speed and performance of Vue project pages, and provide specific code examples.

1. Use routing loaded on demand
In the Vue project, the routing configuration of the page is very important. When the project becomes large, the routing file may become very large, making the Javascript file loaded at startup of the entire project too large, affecting the loading speed of the page. In order to solve this problem, you can use on-demand loading routing, split the routing according to modules, and only load the required modules when the corresponding page is accessed, thereby reducing the loading time required during page initialization.

For example, in the routing configuration file, you can define the original route as an asynchronous component and use Webpack's import() function to asynchronously load the component:

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

const routes = [
  {
    path: '/',
    name: 'home',
    component: Home
  },
  {
    path: '/about',
    name: 'about',
    component: About
  }
]

2 , Use lazy loading to load images
In Vue projects, the loading of images may also affect the loading speed of the entire page. In order to reduce the stress when the page is first loaded, you can use lazy loading to load images. Lazy loading means that the image is loaded only when the user scrolls to the location of the image. This can reduce unnecessary network requests and improve page loading speed.

In the Vue project, you can use the Vue-Lazyload plug-in to implement lazy loading of images:

First, install the Vue-Lazyload plug-in:

npm install vue-lazyload --save

Then, in the entry file Introduce the Vue-Lazyload plug-in and register:

import VueLazyload from 'vue-lazyload'
Vue.use(VueLazyload)

Next, use the v-lazy command on the images that need to be loaded lazily:

<img src="/static/imghwm/default1.png"  data-src="https://cdn.jsdelivr.net/npm/vue"  class="lazy"  v-lazy="imageSrc" alt="lazy">

3. Use CDN Accelerate the loading of third-party libraries
In Vue projects, we often use third-party libraries to implement some functions. However, some third-party libraries are larger and will slow down the loading of the entire page if loaded from the project server every time. To solve this problem, you can use a CDN (Content Delivery Network) to speed up the loading of third-party libraries.

For example, introduce the CDN link of the third-party library in index.html:

<head>
  ...
  <script></script>
</head>

Then, when using Vue in the project, you only need to change Vue from local import to directly use the CDN link :

import Vue from 'vue/dist/vue.js' // 修改前
import Vue from 'vue' // 修改后

By using CDN, the loading time of third-party libraries can be greatly reduced and the page loading speed can be improved.

4. Asynchronous components using Vue components
In the Vue project, components are also a very important part. When the project becomes large, the loading of components may also affect the loading speed of the page. In order to improve the loading efficiency of components, you can use asynchronous components of Vue components.

The asynchronous component of the Vue component can be implemented using Webpack's import() function to define the component as asynchronous loading:

Vue.component('async-component', () => import('./components/AsyncComponent.vue'))

When using asynchronous components, we can use Vue's Loading component displays a loading status to improve user experience:

<template>
  <div>
    <loading v-if="loading" />
    <async-component v-else/>
  </div>
</template>

The above are some practical tips that can be used to optimize the loading speed and performance of Vue project pages. These optimizations will become even more important as our projects grow larger. Through reasonable routing configuration, lazy loading of images, using CDN to accelerate third-party libraries and using asynchronous components, we can significantly improve the loading speed and performance of our Vue project.

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