商家红包活动

 // pack-checkout/components/discount.js
+import util from '../../utils/util'
+import App from '../../utils/uri'
 Component({
   /**
    * 组件的属性列表
@@ -42,6 +44,27 @@ Component({
         display:false,
       })
     },
-
+    discountChecked(e){
+      console.log('discountChecked',e)
+      let index=util.attr(e,'index')
+      let discount=this.data.checkout.discount
+      let checked=discount[index].checked
+      discount[index].checked=!discount[index].checked
+      if(checked) {
+        let subsidy_price=(this.data.checkout.subsidy_price/1 - discount[index].price/1).toFixed(2)
+        this.setData({
+          [`checkout.subsidy_price`]: subsidy_price,
+          [`checkout.discount`]: discount,
+          checkedNum:this.data.checkedNum-1,
+        })
+      }else{
+        let subsidy_price=(this.data.checkout.subsidy_price/1 + discount[index].price/1).toFixed(2)
+        this.setData({
+          [`checkout.subsidy_price`]: subsidy_price,
+          [`checkout.discount`]: discount,
+          checkedNum:this.data.checkedNum+1,
+        })
+      }
+    },
   }
 })

@@ -9,12 +9,12 @@
         <view class="tips">红包均为一次使用，不找零、不兑现，每次买单抵扣不超过消费总额</view>
         <view class="content">
             <view class="msg flex-ll">
-                你选中了<text class="light">{{checkedNum}}</text>个红包，共可抵扣<text class="light">{{checkout.subsidy_price}}</text>
+                你选中了<text class="light">{{checkedNum}}</text>个红包，共可抵扣<text class="light">￥{{checkout.subsidy_price}}</text>
             </view>
             <view class="list">
                 <view class="quan" wx:for="{{checkout.discount}}" wx:key="discount">
                     <quan quan="{{item}}">
-                        <radio value="r1" checked="{{item.checked}}" color="#F05522"/>
+                        <radio data-index="{{index}}" checked="{{item.checked}}" color="#F05522" bindtap="discountChecked"/>
                     </quan>
                 </view>