vue3.2/Vite/Ts28: 设置默认激活菜单项

<template>
  <div class="layout_container">
    <div class="layout_slider">
      <!-- ... -->
      <el-scrollbar class="scrollbar">
        <!-- 默认激活菜单 -->
        <el-menu
          :default-active="$route.path"
          background-color="#001529"
          text-color="white"
        >
          <menu :menuList="userStore.menuRoutes"></menu>
        </el-menu>
      </el-scrollbar>
    </div>
    <!-- ... -->
  </div>
</template>
<script setup lang="ts">
  //...
  // 获取路由对象
  import { useRoute } from "vue-router";
  let $route = useRoute();
  //...
</script>