ant design for vue 刷新頁面，根據當前路由選中相應菜單

<a-menu theme="dark" mode="horizontal" class="menu__a" @select="changeMenu"
                :defaultSelectedKeys="[$route.name]":selectedKeys="[$route.name]">

 <a-menu-item :key="page.name" :path="page.path" v-for="page in menus"> 
　　<router-link :to="page.path">{{page.title}}</router-link> 
</a-menu-item> 
</a-menu>