javascript-计算总和

代码：
    <script src="http://code.jquery.com/jquery-1.11.0-beta1.js"></script>
    <script type="text/javascript">
        $(function () {
            $("input[type=checkbox][name=ckb_select]").click(function () {
                var objs = $("input[type=checkbox][name=ckb_select]:checked").map(function () {
                    var tr = $(this).closest("tr");
                    return { "dj": $(tr).find("td:eq(1)").text(), "zhj": $(tr).find("td:eq(2)").text(), "zp": $(tr).find("td:eq(3)").text() };
                }).get();

                var tj = 0, zhj = 0, zp = 0;
                $.each(objs, function (i, d) {
                    tj = parseInt(tj) + parseInt(d.dj);
                    zhj = parseInt(zhj) + parseInt(d.zhj);
                    zp = parseInt(zp) + parseInt(d.zp);
                })

                $("#tb_tj tr:last td:eq(1)").text(tj + "元");
                $("#tb_tj tr:last td:eq(2)").text(zhj + "元");
                $("#tb_tj tr:last td:eq(3)").text(zp + "件");
            })
        })
    </script>
</head>
<body>
    <table id="tb_tj">
        <tr>
            <th>选择</th>
            <th>定价</th>
            <th>折后价</th>
            <th>赠品</th>
        </tr>
        <tr>
            <td><input type="checkbox" name="ckb_select" /></td>
            <td>420</td>
            <td>378</td>
            <td>1</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="ckb_select" /></td>
            <td>560</td>
            <td>504</td>
            <td>1</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="ckb_select" /></td>
            <td>280</td>
            <td>252</td>
            <td>1</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="ckb_select" /></td>
            <td>540</td>
            <td>486</td>
            <td>1</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="ckb_select" /></td>
            <td>33</td>
            <td>22</td>
            <td>1</td>
        </tr>
        <tr>
            <td><input type="checkbox" name="ckb_select" /></td>
            <td>567</td>
            <td>235</td>
            <td>1</td>
        </tr>
        <tr>
            <td></td>
            <td></td>
            <td></td>
            <td></td>
        </tr>
    </table>
</body>
</html>
图片：
javascript-计算总和

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