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
orv-for
instructions. - Asynchronous methods cannot be called in Vue templates, but can only be called in components or other methods.
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