Tips for using mixins to reuse stateful components in Vue

Tips of using mixins to implement stateful component reuse in Vue

In the development process of Vue, reusing components is a very common requirement. The mixin mode in Vue can help us reuse stateful components more easily.

What is a mixin?

Mixin is a way of code reuse. It allows us to add the same code in different components. In Vue, a mixin is an object that can be imported by multiple components.

Steps to use mixin

If you want to use mixin in Vue, you need to follow the following steps:

1. Define mixin

First , we need to create a mixin. In a mixin, we can define some properties and methods to be shared. For example, the following mixin defines an object named counter, which contains the count property and the increment() method:

const counter = {
  data() {
    return {
      count: 0
    }
  },
  methods: {
    increment() {
      this.count++
    }
  }
}

2. Introducing mixin

To use mixin in Vue, you need to introduce the mixin object in the component options. Taking a single-file component as an example, we can use the mixins attribute to introduce mixin in the component options:

<template>
  <div>
    <button @click="increment">{{ count }}</button>
  </div>
</template>

<script>
import counter from './counter'

export default {
  mixins: [counter],
}
</script>

In this way, we can use the count attribute inside the component and increment() method.

3. Using mixin

When we introduce the mixin, the component will inherit the properties and methods in the mixin. This way, we can use properties and methods from the mixin in our components without having to define them again.

For example, in the above example, we can use the count attribute and the increment() method in the template.

<template>
  <div>
    <button @click="increment">{{ count }}</button>
  </div>
</template>

In fact, we can even use multiple mixin objects, which contain many shared properties and methods.

Merging of mixin and component options

When using mixin, please note that the properties and methods in the mixin object will be merged with the properties and methods in the component. If there are properties or methods with the same name in the mixin and the component, the properties or methods of the component will override the properties or methods in the mixin.

For example:

const counter = {
  data() {
    return {
      count: 0
    }
  },
  methods: {
    increment() {
      this.count++
    }
  }
}

export default {
  data() {
    return {
      message: 'hello'
    }
  },
  methods: {
    setMessage() {
      this.message = 'goodbye'
    }
  },
  mixins: [counter],
}

In this example, the data() and methods options in the component override the data in the mixin () and methods options.

When the same properties exist in component options and mixin, component options have higher priority than mixin.

Summary

Using mixins can help us reuse component properties and methods in Vue, allowing us to write code more concisely and efficiently. When there are components that need to be reused in your Vue project, you might as well try using mixins!

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