优化此代码 watch( () => currentMenu, () => { if (currentMenu.value.children) { openKeys.value = [ currentMenu.value?.parentId, currentMenu.value?.children[0].parentId, ] selectedKeys.value = [currentMenu.value?.id] } else { openKeys.value = [currentMenu.value?.parentId] selectedKeys.value = [currentMenu.value?.id] } }, { immediate: true, deep: true, }, )

可以尝试将代码进行重构，如下所示：

watch(currentMenu, () => {
  if (!currentMenu.value) {
    return;
  }
  
  const { parentId, children, id } = currentMenu.value;
  
  openKeys.value = children ? [parentId, children[0].parentId] : [parentId];
  selectedKeys.value = [id];
}, {
  immediate: true,
  deep: true,
});

这样可以让代码更加清晰易懂，并且减少了重复的代码。同时，我们也使用了解构赋值来提高代码的可读性。