VUE3 basic tutorial: Using Vue plug-ins to extend functions

Vue is a popular JavaScript framework, and the Vue plug-in is a way to extend the functionality of Vue, which can improve our development efficiency. In this article, we will learn how to extend the basic functionality of Vue using Vue plugins.

The Vue plug-in is composed of a JavaScript object with an install method. The object can be a function or an object, and the Vue functionality to be extended is defined in the install method. These installation methods can add components, mixers, directives, etc.

Install plug-in
To use the Vue plug-in, we must install it first. There are two methods for installing plug-ins, namely global registration and local registration.

Global registration
Global registration is the simplest registration method. It is executed before the Vue instance is initialized. You can use the Vue.use() method to register plugins globally. For example:

import MyPlugin from './my-plugin.js'
Vue.use(MyPlugin)

This way you can use all these plugins in your application.

Partial registration
Partial registration is to register the plug-in inside the Vue component. Only takes effect when used in a component. For example:

import MyPlugin from './my-plugin.js'
export default {
  data() {},
  plugins: [MyPlugin]
}

Add components
Plug-ins can add custom components. Through the Vue.component() method, we can add components to the Vue instance. For example, the following code demonstrates how to add a global component:

Vue.component('my-component', {
  template: '<div>这是一个自定义组件</div>'
})

Now, we can use this new component in the template:

<template>
  <div>
    <my-component></my-component>
  </div>
</template>

Add a mixer
The Vue mixer is A special object that allows us to combine a set of logic with the options of a Vue component. Plugins can add mixers. For example, the following code demonstrates how to add a global mixer:

Vue.mixin({
  created() {
    console.log("这是一个全局的混合器")
  }
})

Now, when we create any Vue instance, the mixer will be called in the created lifecycle hook:

new Vue({})

Add Directive
directive is a Vue-specific directive that can add specific behaviors or respond to events for DOM elements. Plugins can add directives. For example, the following code demonstrates how to add a global directive:

Vue.directive('my-directive', {
  inserted: function(el, binding) {
    el.textContent = binding.value.toUpperCase()
  }
})

Now, we can use the new directive in the template:

<template>
  <div>
    <p v-my-directive="'这是一个自定义指令'"></p>
  </div>
</template>

Summary
The Vue plugin is a powerful extension Methods of Vue functions. With plugins, we can add custom components, mixers, directives, and more. To use a plugin, we must first install it before it can be used in the application. We can then register the plugin globally or locally and add components, mixers and directives. As we learn more plugins, we will be able to better extend Vue's functionality and improve our development efficiency.

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