fix product cart log

go/gopath/src/fohow.com/apps/models/order_model/order.go

@@ -175,7 +175,7 @@ func GetOrderById(oId string, useCache bool) (order *Order) {
 	beego.BeeLogger.Warn("order.useCache =[%v]", useCache)
 
 	if item != nil && len(item.ExpressOrderNo) > 0 {
-		beego.BeeLogger.Warn("order.ExpressOrderNo =[%v]", order.ExpressOrderNo)
+		beego.BeeLogger.Warn("order.ExpressOrderNo =[%v]", item.ExpressOrderNo)
 
 		item.Sign = GenExpressPassword(item.ExpressOrderNo)
 		item.CTime = item.CreatedAt.Unix()