<view class="coupon-cell" bindtap="select">
  优惠券
  <view class="choose">
    <block wx:if="{{amount}}">
      <text class="value chosen">-￥{{amount}}</text>
    </block>
    <block wx:else>
      <text class="value">选择优惠券</text>
    </block>
    <image class="right"
        src="../../../../static/images/arrow-right-2.png"></image>
  </view>
</view>