bugfixed

pages/scan/scan.js

@@ -123,7 +123,7 @@ Page({
       //超额
       if(totalDiscTemp > this.data.totalPrice){
         let req = {}
-        req.discCouponErrMsg = "超额优惠券"
+        req.discCouponMsg = "超额优惠券"
         req.discCouponState = 4;
         this.useCouponCallback(ACTION_USE_COUPON, req)
         return