jquery获取上一节点的值

Question

<table>
    <th>张三</th>
    <td>
        <input type="text"  id="popName" name="popName">
    </td>
</table>
<script>
    var name = $('#popName').parent().prev().html();
    console.log(name);
</script>

Answer 1

<table>
<th>张三</th>
<td>
               <input type="text"  id="popName" name="popName">
</td>
</table>
<script>alert($('#popName').parents('table').find('th').html());</script>