Best practices for implementing lazy loading of images in Vue

In front-end development, lazy loading of images is one of the effective ways to improve website performance. The Vue framework provides some excellent tools to implement lazy loading of images, especially in web applications that handle a large number of images. This article will introduce the best practice on how to implement lazy loading of images in Vue.

1. What is lazy loading of images

Lazy loading of images means that images are loaded when the user scrolls the page. The user does not need to wait for all images to be loaded before displaying the page. This method can effectively reduce the load on the server, speed up page loading, and improve user experience.

2. Image lazy loading library in Vue

There are many excellent image lazy loading libraries in Vue, such as: vue-lazyload, vue-image-lazy, etc.

Among them, vue-lazyload is one of the most popular libraries. It has the following characteristics:

1. Customizable loading animation. Custom animations can be displayed when the image is not loaded.
2. Support custom error pictures. When the image fails to load, a custom error image can be displayed.
3. Support image transition effects. The transition effect can be displayed when the image is loaded.
4. You can customize the loading method. Can be loaded by scrolling, touching, etc.

Based on the above advantages, we choose vue-lazyload as an example of lazy loading of images in this article.

3. How to use vue-lazyload in Vue

1. Installation library

Before installation, we need to ensure that Vue.js has been introduced. It can be installed in the following ways:

npm install vue-lazyload --save

2. Introducing components

You can introduce components into the main.js file:

import VueLazyload from 'vue-lazyload'
Vue.use(VueLazyload, {
  preLoad: 1.3,
  error: 'http://static.domain.com/error.png',
  loading: 'http://static.domain.com/loading.gif',
  attempt: 1
})

Among them, the attribute description:

• preLoad: The ratio of preload height, the default value is 1.3.
• error: The image path displayed when loading errors.
• loading: The image path displayed when loading.
• attempt: The maximum number of retries after loading failure, the default value is 3.

3. Using lazy loading

In the vue template, we use the v-lazy directive to use lazy loading:

<img v-lazy="item.src" />

Among them, item.src is the path of the image that needs to be loaded.

4. Summary

Lazy loading of images can effectively improve website performance and user experience, especially in web applications that process a large number of images. The vue-lazyload library provided by Vue provides many customization options, which can ensure the ease of use and performance of the website while meeting the functional requirements. I hope the introduction in this article can help you better implement the best practice of lazy loading of images in Vue.

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