Suspense组件

等待异步组件时额外渲染一些内容，让应用有更好的用户体验

示例

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<template>
<div class="app">
  <h3>我是App组件（祖）</h3>
  <Suspense>
    <template v-slot:default>
      <Child/>
    </template>
    <template v-slot:fallback>
      <h3>稍等，加载中……</h3>
    </template>
  </Suspense>
</div>
</template>
<script>
import {defineAsyncComponent} from "vue";
const Child=defineAsyncComponent(()=>import('./components/Child.vue')) //异步引入
export default {
  name: 'App',
  setup(){
 
 
  },
  components:{Child}
 
}
</script>
 
<style>
.app{
  background-color: gray;
  padding:10px;
}
</style>