Vue3 异步组件 suspense使用详解

<template>
  <div class="layout">
    <h1>suspense</h1>
    <Suspense>
        <template #default>
            <sus></sus>
        </template>
        <template #fallback>
              <copyVue/>
        </template>
    </Suspense>
  </div>
</template>
<script lang="ts" setup>
import { defineAsyncComponent } from "vue";
import copyVue from "./sus/copy.vue";
let sus = defineAsyncComponent(() => import("./sus/index.vue"));
</script>
<style scoped lang="scss">
 $bg:#ccc;
 .layout{
    width: 800px;
    height: 400px;
    background-color: $bg;
    margin: auto;
 }
</style>

 <Suspense>
        <template #default>
            <sus></sus>
        </template>
        <template #fallback>
              <copyVue/>
        </template>
    </Suspense>

<template>
    <div class="sus">
        <img class="img" :src="res.url" alt="">
        <h1 class="posi">{{res.name }}</h1>
        <h1 class="posi">{{ res.des }}</h1>
    </div>
</template>
<script lang="ts" setup>
import axios from 'axios'
import './com.scss'
let fn = ()=>{
    return new Promise(  (resolve,reject)=>{
         setTimeout(async() => {
            resolve(axios.get('/data.json'))
         }, 2000);
    })
 }
 let {data:{data:res}}:any =  await   fn()
  console.log(res);
</script>
<style scoped lang='scss'>
 
.sus{
    width: 100%;
    height: 200px;
    background-color: #999;
}
 
</style>

<template>
    <div  v-loading="loading" element-loading-text="加载中..." 
    element-loading-background="rgba(122, 122, 122, 0.8)" class="sus">
    </div>
</template>
<script lang="ts" setup>
import axios from 'axios'
import { ref } from 'vue'
const loading = ref(true)
</script>
<style scoped lang='scss'>
.sus{
    width: 100%;
    height: 200px;
}
 
</style>

.posi{
    height: 50px;
    background-color: rgb(209, 136, 136);
    margin-top: 20px;
 }
 .img{
     width: 30px;
     height: 30px;
     background-color: rgb(113, 52, 52);
 }

{
    "data":{
         "name":"你好世界",
         "url":"./favicon.ico",
         "des":"世界是个荒原"
    }
}