health.applet/miniprogram/module/user/components/field-cascader/field-cascader.wxml

<!--module/user/components/field-cascader/field-cascader.wxml-->
<picker class="field-cascader" mode="region" bindchange="onConfirm" value="{{value}}">
  <view class="field-cascader__inner">
    <block wx:if="{{value.length}}">
      {{value[0].name}}/{{value[1].name}}/{{value[2].name}}
    </block>
    <view wx:else class="placeholder">请选择</view>
  </view>
</picker>