如何用js语句给下面 <table>的 <tr id="t3"> <td>333 </td> </tr> 做一个超链接

如 <table>
  <tr id="t1"> <td>111 </td> </tr>
  <tr id="t3"> <td>333 </td> </tr>
  </table>

就是用js 给333写一个超链接.谢谢

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>test</title>
</head>
<body>
    <div>
        <table>
            <tr id="t1">
                <td>
                    111
                </td>
            </tr>
            <tr id="t3">
                <td>
                    333
                </td>
            </tr>
        </table>
    </div>
</body>
</html>

<script type="text/javascript">
    var tbl = document.getElementsByTagName('table')[0];
    var cellText = tbl.rows[1].cells[0].innerHTML;
    tbl.rows[1].cells[0].innerHTML = '';
    var aobj = document.createElement('a');
    aobj.setAttribute('href', '
    aobj.setAttribute('target', '_blank');
    aobj.appendChild(document.createTextNode(cellText));
    tbl.rows[1].cells[0].appendChild(aobj);  
   
</script>

huo

 

var tr = document.getElementById('t3');
tr.innerHTML = tr.innerHTML.replace(/<td>(.+)</td>/, '<td><a href="http://g.cn">$1</a></td>');