使用Javascript和JSON进行加减

我有一个t恤价格表，你可以选择衣服，颜色，添加多个位置，然后一些额外的选项

当你选择“添加第二次打印”时，我想知道如何制作它。这会给衬衫增加价格，但也会增加价格折扣，比如72件、96件、144件等等

我尝试过多种方法。我想我可能需要一个if语句，所以无论何时选择第二个打印选项，它都会增加价格，但随后会对每件进行折扣，但我似乎无法理解

我将在底部显示我的一点代码，但您可以在

谢谢你看

以下是我的JSON选项之一：

var shirtsJSON=[
{
    "pattern": "Delta Adult S/S 5.2oz",
    "basePrice": 4.26,
    "colors": {
        "white": 0,
        "athletic": 0.12,
        "color": 0.23
    },

    "deductions": {
        "de48pp": 0,
        "de72pp": 0.68,
        "de96pp": 1.01,
        "de144pp": 1.45,
        "de288pp": 1.69,
        "de576pp": 1.91,
        "de1200pp": 1.98,
        "de1800pp": 1.98,
        "de2400pp": 1.98,
        "de5000pp": 1.98
    },
    "oneLocation": {
        "onelocnone": 0,
        "oneloc12": 3.28,
        "oneloc34": 5.41,
        "oneloc56": 7.52,
        "oneloc78": 9.69,
        "oneloc910": 11.80
    },
    "twoLocation": {
        "twolocnone": 0,
        "twoloc12": 3.28,
        "twoloc34": 5.41,
        "twoloc56": 7.52,
        "twoloc78": 9.69,
        "twoloc910": 11.80
    },
    "threeLocation": {
        "threelocnone": 0,
        "threeloc12": 3.28,
        "threeloc34": 5.41,
        "threeloc56": 7.52,
        "threeloc78": 9.69,
        "threeloc910": 11.80
    },
    "fourLocation": {
        "fourlocnone": 0,
        "fourloc12": 3.28,
        "fourloc34": 5.41,
        "fourloc56": 7.52,
        "fourloc78": 9.69,
        "fourloc910": 11.80
    }
},

这里是它计算的地方：

        function calculatePrices() {
            totalPrice = 0.00;
            for (i = 1; i <= numShirts; i++) {
                sIndex = parseInt($('#shirt' + i + 'pattern').val());
                color = $('#shirt' + i + 'color').val();
                oneLocation = $('#shirt' + i + 'oneLocation').val();
                twoLocation = $('#shirt' + i + 'twoLocation').val();
                threeLocation = $('#shirt' + i + 'threeLocation').val();
                fourLocation = $('#shirt' + i + 'fourLocation').val();
                deductions = $('#shirt' + i - 'deductions').val();

                price = shirtsJSON[sIndex]["basePrice"];
                price += shirtsJSON[sIndex]["colors"][color];
                price += shirtsJSON[sIndex]["oneLocation"][oneLocation];
                price += shirtsJSON[sIndex]["twoLocation"][twoLocation];
                price += shirtsJSON[sIndex]["threeLocation"][threeLocation];
                price += shirtsJSON[sIndex]["fourLocation"][fourLocation];

                totalPrice += price;
            }

            $('#48pc').html("<u>48pc : </u>" + currency + getMoney(totalPrice * 48));
            $('#72pc').html("<u>72pc : </u>" + currency + getMoney(totalPrice * 72 ));
            $('#96pc').html("<u>96pc : </u>" + currency + getMoney(totalPrice * 96));
            $('#144pc').html("<u>144pc : </u>" + currency + getMoney(totalPrice * 144));
            $('#288pc').html("<u>288pc : </u>" + currency + getMoney(totalPrice * 288));
            $('#576pc').html("<u>576pc : </u>" + currency + getMoney(totalPrice * 576));
            $('#1200pc').html("<u>1200pc : </u>" + currency + getMoney(totalPrice * 1200));
            $('#1800pc').html("<u>1800pc : </u>" + currency + getMoney(totalPrice * 1800));
            $('#2400pc').html("<u>2400pc : </u>" + currency + getMoney(totalPrice * 1800));
            $('#5000pc').html("<u>5000pc : </u>" + currency + getMoney(totalPrice * 5000));


            $('#48pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de48pp) / (1-0.25)));
            $('#72pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de72pp) / (1-0.25)));
            $('#96pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de96pp) / (1-0.25)));
            $('#144pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de144pp) / (1-0.15)));
            $('#288pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de288pp) / (1-0.15)));
            $('#576pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de576pp) / (1-0.12)));
            $('#1200pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de1200pp) / (1-0.12)));
            $('#1800pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de1800pp) / (1-0.12)));
            $('#2400pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de2400pp) / (1-0.12)));
            $('#5000pp').html("<u>Per Piece : </u>" + currency + getMoney((totalPrice - shirtsJSON[sIndex].deductions.de5000pp) / (1-0.10)));

函数calculatePrices（）{
总价=0.00；
对于（i=1；i首先，我建议您在服务器端进行计算。您可以使用一个简单的Web服务和一个以衬衫数量为参数的方法

如果不使用WCF服务，可以使用以下库反序列化JSON参数：


执行计算并将其发送回客户端。使用jQuery可以轻松完成此操作，如下所述：

在成功回调中，您可以操纵DOM以显示正确的信息