<view class="countdown-class i-count-down">
  <slot></slot>
  <em class="em" wx:if="{{showDay&&time.day>0}}">{{time.day}}天</em>
  <text class="item-class">{{time.hour}}</text>:
  <text class="item-class">{{time.minute}}</text>:
  <text class="item-class">{{time.second}}</text>
</view>