根據官方文件例子的描述navbar要這樣使用:

<mt-navbar v-model="selected">
  <mt-tab-item id="1">選項一</mt-tab-item>
  <mt-tab-item id="2">選項二</mt-tab-item>
  <mt-tab-item id="3">選項三</mt-tab-item>
</mt-navbar>

<!-- tab-container -->
<mt-tab-container v-model="selected"
 
>
  <mt-tab-container-item id="1">
    <mt-cell v-for="n in 10" :title="'內容 ' + n" />
  </mt-tab-container-item>
  <mt-tab-container-item id="2">
    <mt-cell v-for="n in 4" :title="'測試 ' + n" />
  </mt-tab-container-item>
  <mt-tab-container-item id="3">
    <mt-cell
 
 v-for="n in 6" :title="'選項 ' + n" />
  </mt-tab-container-item>
</mt-tab-container>

<mt-navbar v-model="selected">
  <mt-tab-item :id="1">選項一</mt-tab-item>
  <mt-tab-item :id="2">選項二</mt-tab-item
 
>
  <mt-tab-item :id="3">選項三</mt-tab-item>
</mt-navbar>

<!-- tab-container -->
<mt-tab-container v-model="selected">
  <mt-tab-container-item :id="1">
    <mt-cell v-for="n in 10" :title="'內容 ' + n" />
  </mt-tab-container-item>
  <mt-tab-container-item :id="2">
    <mt-cell v-for="n in 4" :title="'測試 ' + n" />
  </mt-tab-container-item>
  <mt-tab-container-item :id="3">
    <mt-cell v-for="n in 6" :title="'選項 ' + n" />
  </mt-tab-container-item>
</mt-tab-container>