javascript - jQuery 中列的总计

Question

以下代码无效。正如您在 jsfiddle 上看到的那样，我需要按列汇总所有内容.出了什么问题？

HTML

<table id="sum_table" width="300" border="1">
    <tr>
        <td>Apple</td>
        <td>Orange</td>
        <td>Watermelon</td>
    </tr>
    <tr>
        <td class="rowDataSd">1</td>
        <td class="rowDataSd">2</td>
        <td class="rowDataSd">3</td>
    </tr>
    <tr>
        <td class="rowDataSd">1</td>
        <td class="rowDataSd">2</td>
        <td class="rowDataSd">3</td>
    </tr>
    <tr>
        <td class="rowDataSd">1</td>
        <td class="rowDataSd">2</td>
        <td class="rowDataSd">3</td>
    </tr>
    <tr class="totalColumn">
        <td class="totalCol">Total:</td>
        <td class="totalCol">Total:</td>
        <td class="totalCol">Total:</td>
    </tr>
</table>

Javascript

$(document).ready(function(){


   $(".rowDataSd").each(function() {
      newSum.call(this);
    });

});


function newSum() {
    var $table = $(this).closest('table');
    var total = 0;

    $(this).attr('class').match(/(\d+)/)[1];

$table.find('tr:not(.totalColumn) .rowDataSd').each(function()  {
        total += parseInt($(this).html());

});

$table.find('.totalColumn td:nth-child('')').html(total);
}

Answer 1

这是一个jsffile .希望这有帮助

  <table id="sum_table" width="300" border="1">
        <tr class="titlerow">
            <td>Apple</td>
            <td>Orange</td>
            <td>Watermelon</td>
        </tr>
        <tr>
            <td class="rowDataSd">1</td>
            <td class="rowDataSd">2</td>
            <td class="rowDataSd">3</td>
        </tr>
        <tr>
            <td class="rowDataSd">1</td>
            <td class="rowDataSd">2</td>
            <td class="rowDataSd">3</td>
        </tr>
        <tr>
            <td class="rowDataSd">1</td>
            <td class="rowDataSd">5</td>
            <td class="rowDataSd">3</td>
        </tr>
        <tr class="totalColumn">
            <td class="totalCol">Total:</td>
            <td class="totalCol">Total:</td>
            <td class="totalCol">Total:</td>
        </tr>
    </table> 
<script>
       var totals=[0,0,0];
        $(document).ready(function(){

            var $dataRows=$("#sum_table tr:not('.totalColumn, .titlerow')");

            $dataRows.each(function() {
                $(this).find('.rowDataSd').each(function(i){        
                    totals[i]+=parseInt( $(this).html());
                });
            });
            $("#sum_table td.totalCol").each(function(i){  
                $(this).html("total:"+totals[i]);
            });

        });
</script>