Examples to explain how vue registers components in components

In Vue, you can register a component as a global component or a local component. Through registration, you tell Vue where to find the component, and introduce and use it when needed.

There are two ways to register a component inside a component: registration through the components attribute and local registration.

1. Register through the components attribute

The components option of the Vue component receives an object for use in the template. The keys of this object are the names of the components and the values ​​are the definitions of the components. Therefore, you can make other components available for use inside a component by registering them in its components option.

Here is an example:

Vue.component('child-component', {
  template: '<div>This is a child component</div>'
});

Vue.component('parent-component', {
  template: `
    <div>
      <p>This is a parent component</p>
      <child-component></child-component>
    </div>
  `
});

In this example, the child component child-component is registered as a global component. Then, this child component is used in the template of the parent component parent-component. Within a parent component, child components can be used like any other HTML element.

2. Through local registration

If you only want the component to be used inside the current component, you can register it locally through the components option. Using local registration can reduce the number of globally registered components and improve application performance.

The following is an example:

Vue.component('parent-component', {
  components: {
    'child-component': {
      template: '<div>This is a child component</div>'
    }
  },
  template: `
    <div>
      <p>This is a parent component</p>
      <child-component></child-component>
    </div>
  `
});

In this example, the child component child-component is locally registered through the components option and can only be used in the parent component parent-component.

Summary

In Vue, you can register global components and local components through the component option components. By registering other components, these components can be used inside the current component without the need to redefine each time. Partial registration can also improve application performance.

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