Vue 导出导入异步等待停止
Vue export import async await stops
我使用 Vue 并在 load.js
中有一个方法。
async function loadTask(x) {
return await x; // Some async code
}
export { loadTask };
在我调用的 Vue 组件中,await
阻止 <template>
加载。没有 await
,下面的代码运行。我想念什么?
<script setup>
import { loadTask } from './methods/load.js';
const test = loadTask(3);
console.log(await test);
</script>
<template>
<div>Does not run</div>
</template>
根据文档:
async setup() must be used in combination with Suspense, which is
currently still an experimental feature. We plan to finalize and
document it in a future release - but if you are curious now, you can
refer to its tests (opens new window)to see how it works.
https://v3.vuejs.org/api/sfc-script-setup.html#top-level-await
https://v3.vuejs.org/guide/migration/suspense.html#suspense
因此,如果您有异步设置,则必须像这样在父级中导入此组件:
import { defineAsyncComponent } from "vue";
export default {
components: {
HelloWorld: defineAsyncComponent(() =>
import("./components/HelloWorld.vue")
),
},
};
</script>
并在悬念包裹的模板中使用它:
<template>
<suspense>
<template #default>
<HelloWorld />
</template>
<template #fallback>
<div>Loading...</div>
</template>
</suspense>
</template>
演示:
https://codesandbox.io/s/reverent-sinoussi-9r5or?file=/src/components/HelloWorld.vue
如所述,
如果您不需要异步组件和 Suspense
的全部功能,您可以使用 onBeforeMount
:
const test = ref('');
onBeforeMount(async () => {
test.value = await loadTask(3);
console.log(test.value);
})
或者在 async
函数中进行初始化,您调用时没有 await
完成承诺:
const test = ref('');
const init = async () => {
test.value = await loadTask(3);
console.log(test.value);
}
init();
或使用 promise chainig:
const test = ref('');
loadTask(3).then(task => {
test.value = task;
console.log(test.value);
});
您还需要针对每种情况适当地处理错误。
我使用 Vue 并在 load.js
中有一个方法。
async function loadTask(x) {
return await x; // Some async code
}
export { loadTask };
在我调用的 Vue 组件中,await
阻止 <template>
加载。没有 await
,下面的代码运行。我想念什么?
<script setup>
import { loadTask } from './methods/load.js';
const test = loadTask(3);
console.log(await test);
</script>
<template>
<div>Does not run</div>
</template>
根据文档:
async setup() must be used in combination with Suspense, which is currently still an experimental feature. We plan to finalize and document it in a future release - but if you are curious now, you can refer to its tests (opens new window)to see how it works.
https://v3.vuejs.org/api/sfc-script-setup.html#top-level-await
https://v3.vuejs.org/guide/migration/suspense.html#suspense
因此,如果您有异步设置,则必须像这样在父级中导入此组件:
import { defineAsyncComponent } from "vue";
export default {
components: {
HelloWorld: defineAsyncComponent(() =>
import("./components/HelloWorld.vue")
),
},
};
</script>
并在悬念包裹的模板中使用它:
<template>
<suspense>
<template #default>
<HelloWorld />
</template>
<template #fallback>
<div>Loading...</div>
</template>
</suspense>
</template>
演示:
https://codesandbox.io/s/reverent-sinoussi-9r5or?file=/src/components/HelloWorld.vue
如Suspense
的全部功能,您可以使用 onBeforeMount
:
const test = ref('');
onBeforeMount(async () => {
test.value = await loadTask(3);
console.log(test.value);
})
或者在 async
函数中进行初始化,您调用时没有 await
完成承诺:
const test = ref('');
const init = async () => {
test.value = await loadTask(3);
console.log(test.value);
}
init();
或使用 promise chainig:
const test = ref('');
loadTask(3).then(task => {
test.value = task;
console.log(test.value);
});
您还需要针对每种情况适当地处理错误。