<script language="javascript">
function tableToExcel() {
window.clipboardData.setData("Text",document.all('theObjTable').outerHTML);
try
{
var ExApp = new ActiveXObject("Excel.Application")
var ExWBk = ExApp.workbooks.add()
var ExWSh = ExWBk.worksheets(1)
ExApp.DisplayAlerts = false
ExApp.visible = true
} 
catch(e)
{
alert("您的电脑没有安装Microsoft Excel软件！")
return false
}
 ExWBk.worksheets(1).Paste;
 }
</script>

<table id=theObjTable>
  <tr>
   <td>a</td>
   <td>b</td>
</tr>
</table>

<input type="button" value="导入到excel" onclick="tableToExcel()">