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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.
<code class="javascript">const AsyncComponent = { async load() { return import('./MyComponent.vue'); } };</code>
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.
<code class="javascript">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'; }</code>
Usage scenarios
Asynchronous components and methods are usually used in the following scenarios:
Note:
v-if
or v-for
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