JavaScript页面生成excel文件

<script type="text/javascript">
<!--
function saveCode(obj) {
        var winname = window.open('', '_blank', 'top=10000');
        var strHTML=document.all.tableExcel.innerHTML;
        winname.document.open('text/html', 'replace');
        winname.document.writeln(strHTML);winname.document.execCommand('saveas','','excel.xls');
        winname.close();
}
-->
</script>
<div id="tableExcel"><table width="100%" border="0" cellspacing="0" cellpadding="4">
</table></div>
<input type="button" onClick="saveCode(tableExcel);">