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                > vue3的異步組件用法較vue2有所區別: ``` //異步組件 import { defineAsyncComponent } from 'vue' // 不帶選項的異步組件 let HelloWorld = defineAsyncComponent(() => import('./components/HelloWorld.vue')) // 帶選項的異步組件 const HelloWorldOption = defineAsyncComponent({ loader: () => import('./components/HelloWorld.vue'), delay: 200, timeout: 3000, errorComponent: ErrorComponent, 異步加載組件錯誤時加載該組件 loadingComponent: LoadingComponent 異步加載組件加載中時加載該組件 }) export default { components: { HelloWorld }, setup() { let itemRefs = [] const list = ref(['1', '2', '3']); //方法 const setItemRef = el => { if (el) { itemRefs.push(el) } } onMounted(()=>{ console.log(itemRefs[0]) }) //在模版更新之前 onBeforeUpdate(() => { itemRefs = [] }) //模版更新 onUpdated(() => { console.log(itemRefs) }) //輸出方法和變量給模版使用 return { setItemRef, list } } } </script> ```
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