useLazyFetch 为useFetch提供了一个包装器，通过将lazy选项设置为true，在处理程序解析之前触发导航。
默认情况下，useFetch 会阻塞导航，直到它的async处理程序被解决。useLazyFetch则不会阻塞，实时渲染数据！它将有更好的用户体验。
useLazyFetch 与 useFetch 具有相同的签名。

<template>
  <div v-if="pending">
    Loading ...
  </div>
  <div v-else>
    <div v-for="post in posts">
      
    </div>
  </div>
</template>

<script setup>
/* Navigation will occur before fetching is complete.
  Handle pending and error states directly within your component's template
*/
const { pending, data: posts } = useLazyFetch('/api/posts')
watch(posts, (newPosts) => {
  // Because posts starts out null, you won't have access
  // to its contents immediately, but you can watch it.
})
</script>