Untitled

<!DOCTYPE html>
<html>
  <script src="toUndo.js"  type="text/javascript"></script>
  <script src="undo.js" type="text/javascript"></script>

  <body>
  </tr>
  </thead>
  <tbody>
    <tr class="results" id="first">
  <td>First Place</td>
      <td><input type="number" id="name"/></td>

    </tr>
    <button id="undo">undo</button>
    <script type="text/javascript">undoName();</script>
</body>
</html>

function clearIt {
document.getElementById("name").value = 0;
}

function undoName {
undoButton = document.getElementById("undo");
undoButton.onclick = clearIt;