当直接将setup写在script标签上

会报错vue-router.mjs:3451 TypeError: Failed to fetch dynamically imported module:

这是setup语法糖导致的错误，此时就老老实实按照vue3原本的写法export default{xxxxxx}即可解决

vue3中setup语法糖写法：

<template>
  <button @click="test">测试</button>
</template>
    
<script setup lang="ts">
import { ref } from 'vue'
const a = ref(0);
const test = () => {
  console.log(a)
}

</script>
       
<style scoped></style>

原始正常写法：

<template>
    <div v-for="tag in tagList" :key="tag.id">
      <span>{{ tag.tagName }}</span>
    </div>
</template>
    
<script lang="ts">
import { getTags } from '@/api/tag';
import { tag } from '@/types/api/tag';
import { onMounted, ref } from 'vue';

export default {
  name: "Labels",
  setup() {
    let tagList = ref<tag[]>([])
    //获取所有标签
    const getAllTags = async () => {
      const res = await getTags();
      tagList.value = res.data;
    }
    onMounted(() => {
      getAllTags();
    })
      
    return {
      tagList,
    }

  }
}
</script>   
<style scoped>
</style>

改成原始写法后就不报错了！！！看来还是不能偷懒呀~