js获取table的行数与列数

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<!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=gb2312" />
<title>无标题文档</title>
<script type="text/javascript" language="javascript">
 function init()
 {
   var table =document.getElementById("tab1");
   var rows = table.rows.length;
   alert('行数'+rows);
   var colums = table.rows[0].cells.length;
   alert('列数'+colums);
 }
</script>
</head>

<body onload="init()">
<table width="80%" border="1" id="tab1">
  <tr>
    <td>1</td>
    <td>2;</td>
    <td>3;</td>
    <td>4;</td>
  </tr>
  <tr>
    <td>22;</td>
    <td>21;</td>
    <td>34;</td>
    <td>12;</td>
  </tr>
   <tr>
    <td>12;</td>
    <td>21;</td>
    <td>45;</td>
    <td>65;</td>
  </tr>
</table>

</body>
</html>