Global registration is suitable for common components that are frequently used. After registering the entry file through app.component(), it can be used directly in the entire project, but it will increase the initial loading volume; local registration is suitable for specific components in the module, and needs to be imported and declared in the target component. Loading on demand is conducive to maintenance but cannot be reused across components; local registration is preferred when choosing, unless it is necessary to use it globally, on-demand loading can be combined with the automatic registration tool, and pay attention to unified naming and common errors such as spelling, paths, forgetting declarations, etc.

In Vue projects, there are two ways to register components: global registration and local registration. They each have applicable scenarios, and understanding the difference clearly can make you more efficient and clearer in development.

Global registration of common components suitable for frequent use

If you have a component that will be used repeatedly in multiple places, such as buttons, navigation bars, or loading animations, it is more appropriate to register with global. Through app.component() method, you can register it at one time in the entry file (usually main.js or main.ts ), and then use it directly in the entire project without introducing and declaring it again.

For example:

 const app = createApp(App)

app.component('MyButton', MyButton)
app.mount('#app')

After registering this way, you can directly use the <my-button> tag in any child component. But it should be noted that this method will increase the volume of the initial load, especially when you register many components globally but use only a part of them, which may affect performance.

Local registration is more suitable for specific components within functional modules

For components that are only used in a certain page or module, such as the chart component or pop-up component in a detail page, it is recommended to use local registration. You need to import it first in the target component and then declare it in the components option.

The sample code is as follows:

 import ChildComponent from './ChildComponent.vue'

export default {
  components: {
    ChildComponent
  }
}

The advantage of this method is that it loads on demand, has a clear structure and is easy to maintain. Especially in teamwork, others can tell at a glance that this component is only used in this place and will not affect other places.

However, it should also be noted that local registration cannot be reused across components. If multiple parent components need to use the same child component, they must be repeatedly imported and registered.

How to choose the registration method?

• Prioritize local registration unless you really need to use it multiple places throughout the project.
• If the component library is large, you can combine automatic global registration tools (such as unplugin-vue-components ) to achieve automatic registration on demand.
• Avoid abuse of global registration, prevent naming conflicts and packaging volume swelling.
• Component naming should be consistent with the style, for example, use PascalCase or kebab-case to avoid confusion.

Don't ignore small details

Sometimes you will find that the component is registered but cannot be used, which may be the following reasons:

• Spelling errors, such as inconsistent registration name and label name when used
• Forgot to import component files, or the path is written incorrectly
• Forgot to declare component in setup syntax sugar ( <script setup> needs to be explicitly imported and registered in Vue 3)

In addition, the registration method of Vue 3's Composition API and Vue 2's Options API are basically the same, but when using <script setup> in a combined API, local registration is simpler:

 <script setup>
import MyComponent from &#39;./MyComponent.vue&#39;
</script>

Basically that's it. The registration method itself is not complicated, but choosing the right one can improve the maintainability and performance of the project.

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