VUE3 basic tutorial: Use Vue.js plug-in to handle image loading

Vue.js is one of the most popular front-end frameworks currently. It not only provides a rich template and component library, but also supports many powerful plug-ins, including image loading plug-ins. Using the Vue.js plug-in to handle image loading can help us optimize website performance more easily and improve page loading speed.

In this tutorial, we will introduce how to use the Vue.js plugin to handle image loading. First, we need to install a library called Vue.js plugin. It can be installed in the terminal with the following command:

npm install vue-lazyload --save

After the installation is complete, we need to introduce this library in the main file of Vue.js (usually main.js). Before Vue.js creates an instance, add the following code:

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

Here we introduce the vue-lazyload library and install it into Vue.js using the Vue.use() method. In this way, the vue-lazyload plug-in can be used in Vue.js.

Next, we need to use the vue-lazyload plug-in in the template. This can be accomplished through the following steps:

1. Modify the original img tag to the built-in component v-lazy of Vue.js. For example:

<img v-lazy="imageUrl" />

The imageUrl variable here contains the URL of the image. Note that the v-lazy component in Vue.js automatically determines when to load images based on the state of the Vue.js instance.

2. If you want to set a default placeholder for the image, you can set the value of v-lazy to the URL of the placeholder. For example:

<img v-lazy="imageUrl" v-lazy-placeholder="placeholderImageUrl" />

The placeholderImageUrl variable here contains the URL of the placeholder image. When the image has not been loaded, the page will display the placeholder image until the actual image is loaded.

3. Edit the configuration of the vue-lazyload plug-in and adjust the image loading method according to your needs. You can add the following code to the main file of Vue.js:

Vue.use(VueLazyload, {
  preLoad: 1.3,
  error: 'error.jpg',
  loading: 'loading.gif',
  attempt: 1
})

In this example, we can see that the Vue.js plug-in vue-lazyload supports the following four configuration options:

• preLoad: The height ratio to be preloaded before the actual image is loaded. The default is 1.3 (that is, 1.3 times the height of the image is preloaded before it enters the viewport).
• error: The error image URL displayed when loading the image fails.
• loading: Placeholder image URL displayed during loading.
• attempt: The number of attempts to load the image. The default is 1, which means loading will be attempted at most once.

The above four options are optional and can be adjusted according to specific needs.

Now, we have successfully used the Vue.js plugin vue-lazyload to handle image loading. By using plugins, we can easily optimize our website performance and increase page loading speed.

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