js 表格数值计算

<table id="myTable">
  <tr>
    <td>10</td>
    <td>20</td>
    <td>30</td>
  </tr>
  <tr>
    <td>40</td>
    <td>50</td>
    <td>60</td>
  </tr>
</table>

<script>
  function calculateSum() {
    let sum = 0;
    const table = document.getElementById('myTable');
    const rows = table.getElementsByTagName('tr');
    for (let i = 0; i < rows.length; i++) {
      const cells = rows[i].getElementsByTagName('td');
      sum += parseInt(cells[0].innerHTML);
    }
    console.log('总和为：', sum);
  }
  calculateSum();
</script>