​x
 
<!DOCTYPE html>
<html>
<head>
<script>
function changeContent(id, row, cell, content) {
  var x = document.getElementById(id).rows[row].cells;
  x[cell].innerHTML = content;
}
</script>
</head>
<body>
​
<table id="myTable" border="1">
  <tr>
    <td>Row1 cell1</td>
    <td>Row1 cell2</td>
  </tr>
  <tr>
    <td>Row2 cell1</td>
    <td>Row2 cell2</td>
  </tr>
  <tr>
    <td>Row3 cell1</td>
    <td>Row3 cell2</td>
  </tr>
</table>
​
<p>
<input type="button" onclick="changeContent('myTable', 0, 0, 'Hello')" value="更改内容">
</p>
​
</body>
</html>
​