<template>
  <div className="app">
    <h3>我是app组件</h3>
    <Suspense>
      <template v-slot:default>
        <Child/>
      </template>
      <template v-slot:fallback>
        <h3>加载中</h3>
      </template>
    </Suspense>
  </div>
</template>

<script>
// import child from "@/components/Child";  // 静态引入
import {defineAsyncComponent} from 'vue';

const Child = defineAsyncComponent(() => import('./components/Child.vue'))  // 动态引用
export default {
  name: 'App',
  components: {Child},
}
</script>

<style>
.app {
  background-color: gray;
  padding: 10px;
}
</style>