Question

我正在创建一个发票表，其中我有一个具有相同类的表。我想计算同一行的百分比，找出每个产品的折扣价，然后在计算总和后将其显示到test_sum并显示给total_sum。伙计们，我需要帮助。

<tr>
    <td class="test_charge">50</td>
    <td class="test_discount">10</td>
    <td class="test_sum">Sum:</td>
</tr>
<tr>
    <td class="test_charge">40</td>
    <td class="test_discount">5</td>
    <td class="test_sum">Sum:</td>
</tr>

<tr>
    <td class="total_sum">Total: </td>
</tr>

这是我的代码无效：

var sum = 0.0;
$('.test_sum').each(function()
{
    sum += parseFloat($(this).html());
});
$('.total_sum').html(sum);

抱歉我以前使用过ID时犯了一个愚蠢的错误，我已将其替换为class。

Answer 1

＆＃13;

var total = 0;

// For each item calculate the sum and increase the total sum
$('.item').each(function() {
  var $this = $(this),
      charge = Number($this.find('.item-charge').text()),
      discount = Number($this.find('.item-discount').text());

  var sum = charge  - discount;
  $this.find('.item-sum').text("Sum: " + sum);

  total += sum;
});

$('.total-sum').text("Total: " + total);

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tbody>
  <tr class="item">
      <td class="text-center item-charge">50</td>
      <td class="text-center item-discount">10</td>
      <td class="text-cente item-sum">Sum:</td>
  </tr>
  <tr>
  <tr class="item">
      <td class="text-center item-charge">40</td>
      <td class="text-center item-discount">5</td>
      <td class="text-center item-sum">Sum:</td>
  </tr>
  <tr class="item">
      <td class="text-center item-charge">100</td>
      <td class="text-cente item-discount">10</td>
      <td class="text-center item-sum">Sum:</td>
  </tr>    
  <tr>
      <td colspan="3" class="total-sum">Total: </td>
  </tr>
</tbody>
</table>

＆＃13;

Answer 2

如果你使用班级

var total = 0;

$( "table tr" ).each(function( index ) {
  var found = $( this ).find('.test_charge')
  if(found) { // check for <TR>
   total += parseInt(found.text()) // be sure what you are doing with parseInt    
 }
});

在jquery中计算具有相同id的表行

2 个答案: