<view class=“index-content-box”>
    <view class=“departure-arrival-city”>
      <view class=“departure-city” bindtap=“selTrainStartCity” >上海            </view>
      <span><i></i></span>
      <view class=“arrival-city”>北京</view>
    </view>
    <view class=“departure-date”>04月06日<em>今天</em> <em>周三</em> </view>
    <view>
      <button class=“default-btn” bindtap=“SearchTrain”>搜索</button>
    </view>
  </view>

.departure-arrival-city span i {
  display: inline-block;
  width: 25px;
  height: 25px;
  background: url(images/city-switching-icon.png);
  background-size: 100%;
  margin-top: 13px;
}