tdesign 导航栏显示不出来，如何解决？

vue tdesign 导航栏显示不出来

<template>
  <div class="box">
    <t-head-menu defaultValue="1-1" :defaultExpanded="expanded">
      <template #logo>
        <img height="28" src="" alt="logo" />
      template>
      <t-submenu value="1">
        <template #title>
          <span>菜单1span>
        template>
        <t-menu-item value="1-1">子菜单1-1t-menu-item>
        <t-menu-item value="1-2">子菜单1-2t-menu-item>
        <t-menu-item value="1-3">子菜单1-3t-menu-item>
      t-submenu>
      <t-submenu value="2">
        <template #title>
          <span>菜单2span>
        template>
        <t-menu-item value="2-1">子菜单2-1t-menu-item>
        <t-menu-item value="2-2">子菜单2-2t-menu-item>
        <t-menu-item value="2-3">子菜单2-3t-menu-item>
      t-submenu>
      <template #operations>
        <t-button variant="text" shape="square">
          <search-icon slot="icon" shape="square" />
        t-button>
        <t-button variant="text" shape="square">
          <mail-icon slot="icon" />
        t-button>
        <t-button variant="text" shape="square">
          <user-icon slot="icon" />
        t-button>
        <t-button variant="text" shape="square">
          <ellipsis-icon slot="icon" />
        t-button>
      template>
    t-head-menu>
    <t-head-menu
      defaultValue="1-1"
      theme="dark"
      :expanded="expanded2"
      @expand="expanded2 = $event"
      style="margin-top: 24px"
    >
    t-head-menu>
  div>
template>

<script>
import Vue from 'vue';
import {
  SearchIcon, MailIcon, UserIcon, EllipsisIcon,
} from 'tdesign-icons-vue';

export default Vue.extend({
  components: {
    SearchIcon,
    MailIcon,
    UserIcon,
    EllipsisIcon,
  },
  data() {
    return {
      expanded: ['1'],
      expanded2: ['1'],
    };
  },
});
script>
<style lang="less" scoped>
.t-menu__operations {
  .t-button {
    margin-left: 8px;
  }
}

.t-demo-menu--dark {
  .t-button {
    color: #fff;

    &:hover {
      background-color: #4b4b4b;
      border-color: transparent;
      --ripple-color: #383838;
    }
  }
}
style>

运行出来是这

img