A brief analysis of how to use vue export instances

Vue.js is a lightweight MVVM framework that is widely popular for its ease of use and flexibility. Vue.js provides many useful features, one of which is the ability to export instances. This article will introduce the usage of this function.

What is an export instance?

In Vue.js, you can export a Vue instance to reuse it in other modules. This means you can use the same instance in different places instead of instantiating it in every component that uses it.

How to use export instance?

Let us use a simple example to illustrate the use of export instances.

In this example, we will create a Vue component with the following functionality:

1. Set the name attribute to 'my-component'.
2. Set the data attribute message to "Hello World!".
3. In the created life cycle hook, update the message attribute to "Hello Universe!".
4. In the mounted life cycle hook, update the message attribute to "Hello Galaxy!".
5. In the destroyed life cycle hook, output a message to the console.

Export this Vue component as a Vue instance as shown below:

// MyComponent.vue

<template>
  <div>{{ message }}</div>
</template>

<script>
export default {
  name: 'my-component',
  data() {
    return {
      message: 'Hello World!'
    }
  },
  created() {
    this.message = 'Hello Universe!'
  },
  mounted() {
    this.message = 'Hello Galaxy!'
  },
  destroyed() {
    console.log('Component destroyed')
  }
}
</script>

Now we can import MyComponent in other Vue components and use it in templates as shown below Example:

// AnotherComponent.vue

<template>
  <div>
    <h1>Another Component</h1>
    <my-component></my-component>
  </div>
</template>

<script>
import MyComponent from './MyComponent.vue'

export default {
  components: {
    MyComponent
  }
}
</script>

In this example, we use MyComponent as a child component of another Vue component and use it in that component's template.

We can also use the exported Vue instance in JavaScript as follows:

// main.js

import Vue from 'vue'
import MyComponent from './MyComponent.vue'

new Vue({
  el: '#app',
  components: {
    MyComponent
  },
  template: '<my-component></my-component>'
})

In this example, we make MyComponent the root component of the Vue instance and include it in the page .

Conclusion

The export instance feature of Vue.js is very useful, allowing you to define an instance in one Vue component and then reuse the same instance in multiple components. By exporting a Vue instance of a component, you can better organize and manage your code, and make your code easier to maintain and extend. Hope this article is helpful to you.

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