diff --git a/pages/cart/cart_wk/cart_wk.js b/pages/cart/cart_wk/cart_wk.js
index a8ed543..eff2ef6 100644
--- a/pages/cart/cart_wk/cart_wk.js
+++ b/pages/cart/cart_wk/cart_wk.js
@@ -51,7 +51,10 @@ Page({
       bn_is_post_temp:1, //是不是进行计算包邮模板
 
     paying:0,  //支付中
-    same_ok:1  //同城配送的控制
+    same_ok:1,  //同城配送的控制
+    formData:{
+      order_prom_amount:0
+    }
 
   },
 
diff --git a/pages/cart/cart_wk/cart_wk.wxml b/pages/cart/cart_wk/cart_wk.wxml
index d030b69..884f90b 100644
--- a/pages/cart/cart_wk/cart_wk.wxml
+++ b/pages/cart/cart_wk/cart_wk.wxml
@@ -134,7 +134,7 @@
     <text class='zf_left_wz'>支付合计：</text>
     <text class='zf_left_red'>¥{{filters.toFix(order.tail_money+exp_price,2)}}</text>
   </view> -->
-	<view class='zf_left'>支付合计：<text class='zf_left_red'>¥{{filters.toFix(order.tail_money+exp_price-(bn_use_commission?goods.use_commission:0)-formData.order_prom_amount ,2)}}</text></view>
+	<view class='zf_left'>支付合计：<text class='zf_left_red'>¥{{filters.toFix(order.tail_money+exp_price-(bn_use_commission?goods.use_commission:0)-(formData.order_prom_amount?formData.order_prom_amount:0) ,2)}}</text></view>
   <view class="zf_btn {{(submit || !same_ok)?'gray':''}}" bindtap="to_pay">支付尾款</view>
 </view>