获取表格中某行某个单元格的值

<html>
<head>
<script type="text/javascript">
function cell()
  {
  var x=document.getElementById('myTable').rows[0].cells;
  alert(x[0].innerHTML);
  }
</script>
</head>
<body>

<table id="myTable" border="1">
<tr>
<td>cell 1</td>
<td>cell 2</td>
</tr>
<tr>
<td>cell 3</td>
<td>cell 4</td>
</tr>
</table>
<br />
<input type="button" onclick="cell()" value="显示第一个单元">

</body>
</html>

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