Detailed introduction to the steps of using Vue plug-in

Vue is a very popular JavaScript framework, which brings many conveniences to front-end development. However, there are some functions that Vue itself does not provide. At this time, Vue's functions can be extended through plug-ins. A plug-in is usually an object or function that can be used in a Vue instance through the Vue.use() method. In this article, we will introduce in detail the steps to use the Vue plug-in.

1. Install the plug-in
The first step is that when we need to use a Vue plug-in, we first need to install it. Typically, installation plugins can be installed through the npm package manager. We assume that you already have a Vue project, then you can install the vue-carousel carousel plug-in through the following command:

npm install vue-carousel --save

If you want to use this plug-in in the Vue component, then you also need to install it in the component Introduce this plug-in:

import VueCarousel from 'vue-carousel';
Vue.use(VueCarousel);

2. Write the plug-in

If you want to write a Vue plug-in, then you need to define an object or function. The plugin object can contain an install method that receives a Vue object as its only parameter. The plug-in function can directly receive the Vue object as its parameter, and then make some necessary configurations in the function. The following is a simple example:

// plugin.js
export default {
  install(Vue) {
    Vue.prototype.$translate = function (text) {
      return text.toUpperCase();
    };
  },
};

// main.js
import Vue from 'vue';
import plugin from './plugin.js';
Vue.use(plugin);

// App.vue
<template>
  <div>{{ $translate('hello world') }}</div>
</template>

In the above example, we first define a plug-in object plugin, which contains an install method. In the install method we define a $translate method and It is added to Vue.prototype. Finally, in main.js, we use the plugin through the Vue.use() method. In App.vue, we can use this plug-in through this.$translate() method. In this case, we use it to capitalize the incoming text.

3. Using the plug-in

We have installed the plug-in and written a simple plug-in, now let's see how to use it in the Vue component.

Let’s first recall how to use mixin in Vue components. Use the Vue.mixin() method to globally extend the functionality of Vue components. When using plug-ins, we can introduce global mixins through the Vue.mixin() method, so that each component can use these mixins. The following is an example:

// plugin.js
export default {
  install(Vue) {
    Vue.mixin({
      created: function () {
        console.log('plugin created');
      },
    });
  },
};

// main.js
import Vue from 'vue';
import plugin from './plugin.js';
Vue.use(plugin);

In the above example, we introduce a global mixin in the plug-in, which will execute console.log('plugin_created') when each component is created. This way we can use it in the component.

<template>
  <div>MyComponent</div>
</template>

<script>
export default {
  created() {
    console.log('component created');
  },
};
</script>

In the above example, the component's created() method and the plugin's mixin are both executed. The output result in the terminal will be: plugin_created -> component_created

4. Summary

While using Vue, we will also encounter some difficulties. For example, some functions Vue does not have Provided, but developers can solve this problem by writing plug-ins. A plug-in is usually an object or function that contains an install method. We need to install the plug-in first, and then use the plug-in through the Vue.use() method in the component. Mixins can also be introduced globally through the Vue.mixin() method so that they can be used in every component.

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