vant-weapp组件的外部样式类引用说明

以时间选择插件datetime-picker为例

<van-datetime-picker
  type="datetime"
  value="currentDate"
  :show-toolbar="false"
  :visible-item-count='3'
  active-class="healthSet-date"
/>      

.healthSet-date{
   color:#B49851;
   background:#f00;
 }