What does async mean in vue

Vue’s async modifier is used to create asynchronous components or methods to achieve dynamic loading of components and execution of asynchronous operations to avoid blocking the main thread.

#What is async in Vue?

async in Vue is a modifier used to declare an asynchronous component or method.

Asynchronous component

Asynchronous component is defined using the async load function, which returns a Promise object. When the component requires it, Vue resolves this Promise object and replaces the component template with the resolved result.

const AsyncComponent = {
  async load() {
    return import('./MyComponent.vue');
  }
};

Asynchronous methods

Asynchronous methods are defined using the async keyword, which returns a Promise object. When this method is called, Vue waits for the Promise to resolve before continuing to execute subsequent code.

async function myAsyncMethod() {
  // 等待异步操作完成
  await fetch('https://example.com/api');

  // 执行后续代码
  return '异步操作已完成';
}

Usage scenarios

Asynchronous components and methods are usually used in the following scenarios:

• Loading components that need to be obtained dynamically from the server
• Perform time-consuming asynchronous operations, such as API calls or file uploads
• Avoid blocking the main thread and keep the application responsive

Note:

• Asynchronous components and methods cannot be used directly and need to be dynamically rendered through Vue's v-if or v-for instructions.
• Asynchronous methods cannot be called in Vue templates, but can only be called in components or other methods.

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