Best practice for implementing lazy loading of images in Vue

With the continuous development of Internet technology, web page speed has gradually become a key indicator that affects user experience. In order to improve the loading speed of web pages, we usually consider using lazy loading of images. Lazy loading of images means loading images when the page scrolls to a certain position. This can avoid the problem of loading a large number of images at once, causing the page to load too slowly.

This article will introduce how to use Vue to implement the best practice of lazy loading of images.

1. Introduce the third-party library vue-lazyload

The Vue framework itself does not provide the function of lazy loading of images, so we need to use a third-party library to achieve it. Commonly used lazy loading libraries include vue-lazyload, lozad.js, etc. This article recommends using the vue-lazyload library because it has the following characteristics:

1. Lightweight: The code size of vue-lazyload is very small, only 2KB in size after gzip compression.
2. Adaptive: vue-lazyload can load images of different widths according to the screen sizes of different devices, thereby saving network resources.
3. Support vue2 and vue3: vue-lazyload can support both Vue versions 2 and 3.

Install vue-lazyload

We can use npm or yarn to install vue-lazyload:

npm install vue-lazyload

or

yarn add vue-lazyload

Import vue-lazyload

In the entry file of Vue, import the vue-lazyload library and register it globally:

import Vue from 'vue'
import VueLazyload from 'vue-lazyload'

Vue.use(VueLazyload)

2. Use the lazyload instruction in the template

After using the vue-lazyload library , we only need to use the lazyload instruction in the template to implement lazy loading of images. The usage is as follows:

<template>
  <img src="/static/imghwm/default1.png"  data-src="占位符图片"  class="lazy"  v-lazy="imageURL" alt="图片说明">
</template>

Among them, imageURL represents the URL address of the image, and alt represents the image description text.

It should be noted that in order to prevent the image from being displayed before it is loaded, we recommend setting a placeholder image with the same size as the image in the img tag, as shown below:

<template>
  <img src="/static/imghwm/default1.png"  data-src="占位符图片"  class="lazy"  v-lazy="imageURL" alt="图片说明">
</template>

3. Configure lazyload

In the entry file of Vue, we can configure vue-lazyload globally, as shown below:

import Vue from 'vue'
import VueLazyload from 'vue-lazyload'

Vue.use(VueLazyload, {
  preLoad: 1.3, // 预加载的高度比例，默认为1.3
  error: '错误时显示的图片URL', // 图片加载失败时显示的图片
  loading: '加载中显示的图片URL', // 图片加载时显示的图片
  attempt: 1 // 图片加载失败后重新加载的次数，默认为1
})

Among them, preLoad represents the distance between the image and the bottom of the screen. The distance at which to start loading, the default is 1.3, that is, the image will start loading at a distance of 1.3 times the current screen height from the bottom of the page. error indicates the image address displayed when the image fails to load, loading indicates the image address displayed when the image is loaded, attempt indicates the number of reloads after the image fails to load, and the default is 1.

4. Conclusion

This article introduces the best practice of using the vue-lazyload library to implement lazy loading of images. Implementing lazy loading of images by configuring lazyload can effectively improve the loading speed and user experience of the page. Finally, I would like to remind everyone that when using lazy loading of images, you should also pay attention to properly controlling the preloading distance and loading times to avoid excessive consumption of network resources and mobile phone traffic.

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