<navigator canBack="{{true}}" title="发票管理" />
<van-tabs active="{{ active }}" bind:change="onChange">
  <van-tab title="申请开票">
    <notyet wx:if="{{active === 0}}" />
  </van-tab>
  <van-tab title="已开发票">
    <already wx:if="{{active === 1}}"  />
  </van-tab>
  <van-tab title="开票信息">
    <info wx:if="{{active === 2}}"  />
  </van-tab>
</van-tabs>