Detailed explanation of the suspend function in Vue3: optimizing the application of asynchronous data loading

Detailed explanation of the suspension function in Vue3: Optimizing the application of asynchronous data loading

In modern web application development, asynchronous data loading is a very common scenario. For example, a large amount of data in a web page may take several seconds to load. In this case, we can use lazy-loading technology to load the data only when needed. In addition, there is a more common asynchronous scenario: when loading multiple components, one of the components may take a long time to load for some reasons. At this time, the rendering of other components is blocked, causing The user experience is degraded. To avoid this situation, Vue3 provides us with a tool called the suspend function.

In this article, we will take a deeper look at what the suspend function in Vue3 is and how it helps us optimize asynchronous data loading applications.

1. What is the suspend function?

The suspense function is a new feature in Vue3, which allows us to handle asynchronous data loading scenarios more easily. Whenever an asynchronous component is suspended, the suspense component can help us handle asynchronous loading in a composed manner instead of directly interrupting the entire application.

When we suspend a component, its rollback content will be displayed. Therefore, the suspend function allows us to better handle asynchronous data loading situations while improving user experience.

2. How to use the suspend function?

It is very easy to use the suspension function in vue3. All we have to do is:

1. Introduce the suspension function of Vue3:

<template>
  <suspense>
    <template #default>
      <router-view />
    </template>

    <template #fallback>
      <!-- 回退内容的样式 -->
      <div class="loading">Loading...</div>
    </template>
  </suspense>
</template>

2. Use the suspense function in the component that needs to be suspended:

const MyComponent = defineAsyncComponent({
  loader: () => import('./my-component.vue'),
  delay: 200,
  timeout: 3000,
  errorComponent: ErrorComponent,
  loadingComponent: LoadingComponent
})

export default {
  components: {
    MyComponent,
  },
}

3. Configurable suspense function parameters:

• loader: asynchronous component Load function and return a Promise object.
• delay: Optional, delay rendering callback in milliseconds. For small components, the default value 0 can be used.
• timeout: Optional, indicating the timeout period for suspension. After the timeout, the system will be in a loose state.
• errorComponent: Optional, used to render the component displayed when the asynchronous component fails to load.
• loadingComponent: Optional, a loading rollback component (this component will be the component displayed when suspense rolls back).

Summary

In this article, we have learned that the suspend function in Vue3 greatly simplifies application development for asynchronous data loading. Using the suspend function can better display the rewind (loading) content and improve the user experience. When using the suspend function, we need to pay attention to some configuration parameters, such as timeout, delayed rendering callback, etc. In actual projects, we can use the suspend function to optimize asynchronous scenarios to better meet user needs.

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