[vue3]useRouter里的currentRoute和useRouter().currentRoute不一样是怎么回事？

Question

const router = useRouter();

const activeIndex = ref('/')

onMounted(() => {
  console.log(router)
  console.log("------------")
  console.log(router.currentRoute.value)
  activeIndex.value = router.currentRoute.value.name ?? '/'
})

F5刷新页面后，打印出来两个不一样，上面的是正确的，怎么获取到正确的？