Tips for using mixins to achieve code reuse in Vue

Vue is a very popular JavaScript framework. It not only helps developers quickly build complex single-page applications, but also provides many practical functions to help us write code better. Among them, mixins are a very important concept, which provides a simple and effective way to achieve code reuse.

In this article, we’ll take a deep dive into Vue’s mixins and demonstrate through a few examples how to use them to achieve code reuse techniques.

What are mixins

Mixins are objects in Vue that can contain any number of reusable options. These options can be any lifecycle method, data or computed property, etc. When we use mixins in a component, it merges all the options in the mixins object into the component, making the component have all the functionality in the mixins object.

Example

The following is a simple mixins example that defines a log method:

const logMixin = {
  methods: {
    log(message) {
      console.log('Logging:', message);
    }
  }
}

Now, we can use mixins in the component to merge the logMixin object into In the component:

Vue.component('my-component', {
  mixins: [logMixin],

  mounted() {
    this.log('Component mounted!');
  }
});

In this example, we merge the logMixin object into the my-component component and use the log method in it.

When we run the application and look at the console, we can see the following output:

Logging: Component mounted!

This indicates that the log method generated by mix is ​​already available in the component.

Using option merging

To better understand how mixins work, let’s take a closer look at the option merging rules in Vue. In Vue, component options are merged into a final options object. This object contains all options from the parent component to the child component. When multiple component options have the same name, Vue performs option merging, merging them into a new option.

When using this option to merge and publish mixins to multiple components, we need to ensure that different options in the mixins do not conflict with each other. We can avoid this conflict by using our own namespace:

const logMixin = {
  methods: {
    log(message) {
      console.log('Logging:', message);
    }
  }
}

const helloMixin = {
  methods: {
    hello() {
      console.log('Hello!');
    }
  }
}

const helloLogMixin = {
  mixins: [logMixin, helloMixin],

  methods: {
    world() {
      this.log('World');
      console.log('World');
    }
  }
}

Vue.component('my-component', {

  mixins: [helloLogMixin],

  mounted() {
    this.hello();
    this.world();
  }
});

In this example, we first define logMixin and helloMixin and then merge them into the helloLogMixin object. In helloLogMixin, we also added a world method, which will call the log method in logMixin and log a message to the console. Finally, we merged helloLogMixin into the my-component component and called the hello and world methods in the mounted lifecycle hook function.

After running the application, we can see the following output in the console:

Hello!
Logging: World
World

This shows that both helloMix and logMixin methods can be used in the my-component component and their scope It's completely isolated.

Using global mixins

In Vue, we can also use global mixins. These mixins can be used throughout the application and will be inherited by all components.

In order to use global mixins, we can call the Vue.mixin method. This method requires passing a mixin object containing reusable options. For example:

const logMixin = {
  methods: {
    log(message) {
      console.log('Logging:', message);
    }
  }
}

Vue.mixin(logMixin);

Now, we have logMixin mixed into the entire application.

When we run the application, in the console we can see the following output:

Logging: Message from App component

This indicates that we have successfully injected the mixin into the application, and the methods in the mixin Can be used in all component contexts.

Summary

In Vue, mixins are a very practical function that can help us easily achieve code reuse. Using mixins, we can define reusable code as mixin objects and incorporate them into components. We can also use global mixins to inject "global code" into the entire application. Through the above examples, we can understand how Vue’s mixins work and how to apply them to real applications.

If you want to know more about Vue, please browse the official documentation.

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