cart coupon price

@@ -337,7 +337,11 @@ deliveryWay = {
             that.updateOrder({way: id});
 
             // 重新计算订单价格
-            compute();
+            compute(0, function(data) {
+                if (data.code === 200 && coupon && coupon.$ticketUseTip) {
+                    coupon.$ticketUseTip.find('.price').text('- ¥' + data.data.coupon_amount.toFixed(2));
+                }
+            });
         });
 
         this.$deliveryTime.click(function() {