The Suspense and lazy loading features in Vue 3 improve the user experience of the application

The Suspense and lazy loading features in Vue 3 improve the user experience of the application

Introduction:
In modern web applications, pages load quickly and provide good The user experience is very important. In Vue 3, Suspense and lazy loading features can help developers effectively improve application performance and user experience. This article will introduce the usage of Suspense and lazy loading in Vue 3, and provide code examples to help readers better understand and apply these features.

1. Suspense feature:
Suspense is a new feature in Vue 3, which is used to handle the waiting state when asynchronous components are loaded. It allows developers to display a custom loading indicator during component loading. Through the Suspense feature, developers can better control the rendering process of components and improve user experience.

1. Basic Usage:

   <template>
     <Suspense>
    <template #default>
      <AsyncComponent/>
    </template>
    <template #fallback>
      <Loading/>
    </template>
     </Suspense>
   </template>
   
   <script>
   import { Suspense } from 'vue'
   import AsyncComponent from './AsyncComponent.vue'
   import Loading from './Loading.vue'
   
   export default {
     components: {
    AsyncComponent,
    Loading
     }
   }
   </script>

   In the above code, we wrap the AsyncComponent asynchronous component in the Suspense component by using the Suspense attribute. When AsyncComponent is loading, the content in the fallback template (i.e. Loading component) will be displayed until AsyncComponent is loaded. In this way, users can see a friendly loading indicator during the loading process.

2. Configure delay time:

   <template>
     <Suspense :delay="200">
    <template #default>
      <AsyncComponent/>
    </template>
    <template #fallback>
      <Loading/>
    </template>
     </Suspense>
   </template>

   In the above code, we specify a delay time of 200 milliseconds for the Suspense component through the :delay attribute. This way, even if the component loads quickly, the content in the fallback template will be displayed before loading is complete. The purpose of this is to give users a better loading experience, rather than a flash of loading instructions.

2. Lazy loading features:
Lazy loading refers to loading the code of a component or route only when needed. This can reduce the amount of code initially loaded and improve application performance.

1. Basic usage:

   const AsyncComponent = () => import('./AsyncComponent.vue')

   In the above code, by using the import function and passing in the path of the asynchronous component, we can load the component code asynchronously. In this way, this part of the code will not be loaded during the initial rendering, but will only be loaded when the component is used.

2. Route lazy loading:

   const routes = [
     {
    path: '/',
    name: 'Home',
    component: () => import('./Home.vue')
     },
     {
    path: '/about',
    name: 'About',
    component: () => import('./About.vue')
     }
   ]

   In the above code, we use the import function to asynchronously load the component code into the corresponding route. In this way, the component will be loaded only when the user browses to the route, thereby improving the initial loading speed and application performance.

Conclusion:
The Suspense and lazy loading features in Vue 3 provide developers with a convenient way to improve the user experience of the application. By using the Suspense feature, we can display customized loading instructions during the asynchronous component loading process to provide users with a better loading experience. Using the lazy loading feature, component code can be loaded only when needed, reducing the amount of code initially loaded and improving application performance. I hope this article can help readers better understand and apply these features in Vue 3.

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