<inputtype="button"id="btnExport"value=" Export Table data into Excel "/>
<br/>
<br/>
<div id="dvData">
<table>
<tr>
<th>Column One</th>
<th>Column Two</th>
<th>Column Three</th>
</tr>
<tr>
<td>row1 Col1</td>
<td>row1 Col2</td>
<td>row1 Col3</td>
</tr>
<tr>
<td>row2 Col1</td>
<td>row2 Col2</td>
<td>row2 Col3</td>
</tr>
</table>
</div>
<script>
$("#btnExport").click(function(e){
window.open('data:application/vnd.ms-excel,'+ $('#dvData').html());
e.preventDefault();
});
</script>
Referência: https://pt.stackoverflow.com/questions/120694/como-exportar-uma-tabela-html-para-pdf-e-excel