js變量污染引發的詭異bug

js方法是這樣的：

 //保存提貨券JSON數據到隱藏字段
        saveVoucherListInfoToHiddenFiled: function () {
            //保存綁定商品信息
            var voucherLines = $("#tbVouchersBindCommodityList .cClz");
            var voucherModels = [];
            for (var i = 0; i < voucherLines.length; i++) {
                var $voucher = $(voucherLines[i]);
                var model = $voucher.data("voucher");
                model.BindCommodities = $voucher.data("bindcommodities");
                ////設置提貨券的類型
                //model.BindType = model.BindCommodities.length ? model.BindCommodities[0].BindType : "COMMODITY";

                voucherModels.push(model);
            }
            $("#" + addVoucherModule.data.voucherListID).val(JSON.stringify(voucherModels));

            //綁定促銷信息
            var voucherPromotionLines = $("#tbVouchersBindCommodityList .pClz");
            var voucherPromotionModels = [];
            for (var i = 0; i < voucherPromotionLines.length; i++) {
                var $voucherPromotion = $(voucherPromotionLines[i]);
                var modelPromotion = $voucherPromotion.data("voucher");
                modelPromotion.BindCommodities = $voucherPromotion.data("bindcommodities");
                voucherPromotionModels.push(modelPromotion);
            }
            $("#" + addVoucherModule.data.voucherPromotionListID).val(JSON.stringify(voucherPromotionModels));
        },

　　結果在

 var modelPromotion = $voucherPromotion.data("voucher");取到的值老是有一條與上一條同樣的記錄，最後將第二個i改爲j才完事兒。。。。回頭好好總結下