vue3在setup中获取异步数据并暴露出去

使用生命周期钩子onBeforeMount

setup(){

  const postData = ref([])
    onBeforeMount(async () => {
      const res = await axios.get('http://localhost:3002/postdata')
      postData.value = res.data
    })
    return {
       ...
      postData
    }  
}

const postData = ref([])要加上ref,不然获取不到，踩了一遍坑