和值Javascript

这是销售订单布局。/sharepics/add.zip我需要自定义的完整代码

问题:

动态求和大小在39和50之间的单元格，并将值放入Pairs数量中

已成功添加行，但结果将添加到下面的行中

执行此操作的代码：

var newTr = $('<tr id="row_' + count + '"></tr>');

newTr.html('<td><input name="product' + count + '" type="hidden" value="' + item_code + '"><input class="span5 tran" name="item' + count + '" type="text" value="' + item_code + '"></td> 
.......

<td><input class="input-block-level text-center" name="sort' + count + '" type="text" value="" id="sort-' + count + '" onClick="this.select();"></td>
<td><input class="input-block-level text-center" name="size39' + count + '" type="text" value="" id="size39-' + count + '" onClick="this.select();"></td>

......

<td><input class="input-block-level text-center" name="size50' + count + '" type="text" value="" id="size50-' + count + '" onClick="this.select();"></td>
<td><input class="input-block-level text-center" name="quantity' + count + '" type="text" value="1" id="quantity-' + count + '" onClick="this.select();"></td>
<td><input class="span2 tran" style="text-align:right;" name="unit_price' + count + '" type="text" id="price-' + count + '" value="' + item_price + '"></td>

<?php echo '<td><input class="span2 tran2" name="cart\'+ count +\'" type="text" value="" required="required" data-error="' . $this->lang->line("cart") . ' ' . $this->lang->line("is_required") . '"></td>';

if (DISCOUNT_OPTION == 2) {
    echo '<td><select class="span2 select tran" data-placeholder="Select..." name="discount\' + count + \'" id="discount-\' + count + \'">';
    foreach ($discounts as $discount) {
        echo "<option value=" . $discount->id;
        if ($discount->id == DEFAULT_DISCOUNT) {
            echo ' selected="selected"';
        }
        echo ">" . $discount->name . "</option>";
    }
    echo '</select></td>';
}
?>

<td><input class="input-block-level text-center" name="subtotalpares' + count + '" type="text" value="" id="subtotalpares" disabled onClick="this.select();"></td>
<td><i class="icon-trash tip del" id="' + count + '" title="Remove this Item" style="cursor:pointer;" data-placement="right"></i></td>');


newTr.prependTo("#dyTable");
count++;
an++;
total += parseFloat(item_price);

$("input[id^=size]").keyup(function () {
var sum = 0;
$("input[id^=size]").each(function () {
sum += (parseInt(this.value) ? parseInt(this.value) : 1);
});
$("input[id^=quantity]").val(sum);
});

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我期待着一些帮助

格式化你的代码，它看起来像一个混乱的鸡蛋。有什么办法解决这个问题吗？