How to globally mix mixins in Vue?

Mixin in Vue is a simple way to reuse components. It can encapsulate some commonly used logic into mixins and inject them into multiple components for reuse, thus improving code reuse rate and development efficiency. Vue introduced the global mixin function in version 2.2.0, which can inject mixin into all components. This article will introduce how to perform global mixin in Vue and discuss its advantages and disadvantages.

Use of global mixin

To mix a mixin globally in Vue, we need to use the Vue.mixin function. This function accepts a mixin object as a parameter, and this mixin object can define the same various properties and methods as the component.

const myMixin ={
  methods: {
    // ...
  }
}
Vue.mixin(myMixin)

Now, we globally discover that the methods in the myMixin object can be accessed by all components.

So, what happens when we define a property or method with the same name as the mixin in the component? Vue's mixin priority follows the rules from bottom to top, left to right, that is, properties or methods with the same name in mixins or components defined later will override previous properties or methods.

For example:

const mixinA ={
  created() {
    console.log('mixinA created')
  },
  methods: {
    foo() {
      console.log('mixinA foo')
    }
  }
}

const mixinB ={
  created() {
    console.log('mixinB created')
  },
  methods: {
    foo() {
      console.log('mixinB foo')
    }
  }
}

const myComponent ={
  created() {
    console.log('myComponent created')
  },
  mixins: [mixinA, mixinB],
  methods: {
    foo() {
      console.log('myComponent foo')
    }
  }
}

new Vue({
  el: '#app',
  components: {
    'my-component': myComponent
  }
})

// 输出
// mixinA created
// mixinB created
// myComponent created

In the above example, we defined two mixins (mixinA and mixinB), and one component (myComponent). Among them, the created hook function and foo method are both defined in mixinA and mixinB, and a foo method with the same name is also defined in myComponent. Eventually, Vue will override according to the priority of the properties or methods of the same name in the mixin or component defined later. The final output result is:

myComponent created

This means that the properties or methods of the same name in the mixin and the component will be responsible. Override the properties or methods in the mixin.

Advantages and Disadvantages of Global Mixing

Although global mixing can easily encapsulate business logic into mixin and reuse it in multiple components, there are also many potential problems.

Advantages

1. Functional decoupling and code reuse. The same code in multiple components can be extracted and reused, thus greatly enhancing the scalability of the code.
2. Reduces the complexity of components. Redundant code can be extracted from components, reducing the internal complexity of components and improving the readability and maintainability of components.
3. Conveniently manage and maintain code. Global mix-ins can separate multiple components to facilitate code management and refactoring.

Disadvantages

1. Name conflicts and overwriting issues. Since global mixin will inject the mixin into all components, if used improperly, there may be conflict and override problems in property and method naming, and even pollute the global namespace.
2. Logical code is scattered. Frequent use of global mixins for code reuse may lead to scattered and difficult-to-maintain logical code.
3. Coupling between components. The coupling between components will increase with the global call of mixin, causing the independence between components to decrease.

Based on the above advantages and disadvantages, we can choose global mixing according to specific business scenarios for business logic encapsulation and reuse, or use other reuse technologies, such as slot and render functions, in order to better Manage and maintain code.

Summary

Global mixin is a convenient way to encapsulate commonly used logic into a mixin for reuse of multiple components. However, if used improperly, there may be problems such as code naming conflicts and coverage issues, scattered logical code, and increased coupling between components. Therefore, when using global mix-ins, you must choose the appropriate method for logic encapsulation and code reuse based on specific business scenarios.

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