如何将子文本添加到表格单元格？

  <tr>
    <td>单元格1</td>
    <td>单元格2</td>
  </tr>
  <tr>
    <td>单元格3</td>
    <td>单元格4</td>
  </tr>
</table>

$('table').append('<tr><td>单元格1</td><td>单元格2</td></tr>');

table_data = [
    ['单元格1', '单元格2'],
    ['单元格3', '单元格4']
]

table_html =<table>'
for row in table_data:
    table_html += '<tr>'
    for cell in row:
        table_html += '<td>{}</td>'.format(cell)
    table_html += '</tr>'
table_html += '</table>'