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In Vue, global components are a very important concept that allows us to use the same components everywhere. In this article, we will discuss how to define global components in Vue and the relevant considerations.

1. Using Vue.component() method

Vue.component()The method is the most commonly used method to define global components. Its syntax is as follows:

Vue.component('component-name', {
  // options
})

Among them, 'component-name' is the component name, which can be named in upper camel case or separated by hyphens. For example, 'MyComponent' or 'my-component'. The second parameter is an options object containing the properties and methods of the component.

For example, we can define a simple global component:

Vue.component('my-component', {
  template: '<div>Hello, World!</div>'
})

We can then use this component in any Vue instance:

<my-component></my-component>

2. Using Vue.extend() method

Vue.extend()The method can also be used to define global components. This method accepts an options object and returns a component constructor that we can use to create new component instances.

For example, we can define a global component like this:

var MyComponent = Vue.extend({
  template: '<div>Hello, World!</div>'
})

Vue.component('my-component', MyComponent)

We can then use this component in any Vue instance:

<my-component></my-component>

3. Use .vue single file components

In Vue, we can also use .vuesingle-file components to define global components. This approach requires using Vue CLI or other build tools to compile .vue files.

For example, we can create a file called MyComponent.vue with the following code:

<template>
  <div>Hello, World!</div>
</template>

<script>
export default {
  name: 'my-component'
}
</script>

Then, in main.js , we can register the global component like this:

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

Vue.component('my-component', MyComponent)

We can then use this component in any Vue instance:

<my-component></my-component>

Note:

1. Global components should only be registered once, in the root Vue instance.
2. Component names should be unique. Do not define different components with the same name.
3. Component names should use upper camelCase or hyphenated characters.
4. The component's options object should contain properties and methods such as template, data, and methods.
5. Vue single file components need to be compiled using Vue CLI or other build tools.
6. Components can be inherited or mixed in by other components, so components should be kept simple and independent as much as possible.
7. The use of global components will affect the performance of the application because they will be registered and compiled in each Vue instance. If the components are only used locally, you should consider defining them as local components.
8. The order in which global components are registered is important. If two components have the same name, the one registered later will override the one registered earlier.
9. Global components can be defined using the Vue.component()or Vue.extend()method. .vue single-file components can also be used to define global components, but they need to be compiled using a build tool.
10. Global components can be used in any Vue instance, but it is recommended to use them only when needed to improve the performance and maintainability of the application.

In summary, defining global components is a very important concept in Vue, which allows us to use the same components everywhere. When defining global components, we can use Vue.component().vue Vue.extend()or .vue single-file components to achieve this. However, we need to pay attention to the uniqueness and naming conventions of component names, as well as the impact of global components on application performance.