jquery 循环获取某一列 td里面的值相加 追加到html中

<script type="text/javascript">
  var mod = '<?=seg(1)?>';
  // //子基金基本情况统计
  if(mod == 'tj_tzjc'){ 
    //插入最后一行tr 然后进行叠加
   var html="<tr><td class='nowrap align-center'>总计</td><td class=' '><td class=' '></td><td class='hide-sm  '>"+gettv(3)+"</td><td class='hide-sm  '>"+gettv(4)+"</td><td class='hide-sm hide-md  '>"+gettv(5)+"</td><td class='hide-sm hide-md  '></td><td class='hide-sm hide-md  '>"+gettv(7)+"</td><td class='hide-sm hide-md  '>"+gettv(8)+"</td><td class='hide-sm hide-md  '>"+gettv(9)+"</td><td class='hide-sm hide-md  '>"+gettv(10)+"</td><td class='hide-sm hide-md  '>"+gettv(11)+"</td><td class='hide-sm hide-md  '>"+gettv(12)+"</td><td class='hide-sm hide-md  '>"+gettv(13)+"</td><td class='hide-sm hide-md  '>"+gettv(14)+"</td></tr>";
   $("tbody").append(html);
  }else if(mod == 'tj_bfcz'){
    var html="<tr><td class='nowrap align-center'>总计</td><td class=' '></td><td class=' '></td><td class='hide-sm  '></td><td class='hide-sm  '>"+gettv(4)+"</td><td class='hide-sm hide-md  '>"+gettv(5)+"</td><td class='hide-sm hide-md  '>"+gettv(6)+"</td><td class='hide-sm hide-md  '>"+gettv(7)+"</td><td class='hide-sm hide-md  '></td><td class='hide-sm hide-md  '> </td><td class='hide-sm hide-md  '>"+gettv(10)+"</td><td class='hide-sm hide-md  '>"+gettv(11)+"</td><td class='hide-sm hide-md  '></td><td class='hide-sm hide-md  '></td><td class='hide-sm hide-md  '></td></tr>";
    $("tbody").append(html);
  }
   
  /*获取table 里面指定列的值
   * @param col 指定列 
  */
  function gettv(col){
    var nums = 0;
    var num='';
    $("tbody").find("tr").each(function(){
      var tdArr = $(this).children();
      num = (tdArr.eq(col))[0].innerText.replace(/,/g,'');
      if(num ==''){
        num=0;
      }
      nums += parseFloat(num);
    });
    var fnums = RetainedDecimalPlaces(nums, 2);
    return fnums;
  }
  function RetainedDecimalPlaces(num, del) //值：num 小数位：del 
  {
　　if (del != 0)
　　{
　　　　 num = parseFloat(num).toFixed(del); //天花板函数保留小数并四舍五入
　　 }
　　var source = String(num).split(".");//按小数点分成2部分
　　source[0] = source[0].replace(new RegExp('(\\d)(?=(\\d{3})+$)', 'ig'), "$1,");//只将整数部分进行都好分割
　　return source.join(".");//再将小数部分合并进来
  };
</script>