How to create button with function to export the DataTable to (.csv) in jQuery?

$(document).ready(function() {
  $('#example').DataTable({
    "dom": 'T<"clear">lfrtip',
    "tableTools": {
      "sSwfPath": "/swf/copy_csv_xls_pdf.swf"
    }
  });
});

<script src="https://cdn.datatables.net/1.10.2/js/jquery.dataTables.min.js"></script><scriptsrc="https://cdn.datatables.net/1.10.2/js/jquery.dataTables.js"></script>
<link href="https://cdn.datatables.net/1.10.2/css/jquery.dataTables.css" rel="stylesheet" />
<link href="https://cdn.datatables.net/1.10.2/css/jquery.dataTables.min.css" rel="stylesheet" />
<script src="http://www.datatables.net/release-datatables/extensions/TableTools/js/dataTables.tableTools.js"></script><linkhref="https://cdn.datatables.net/1.10.11/css/jquery.dataTables.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script><buttonid="btnExportar">Exportar</button>

<table id="example" class="display" cellspacing="0" width="100%">

  <thead>
    <tr>
      <th>Nome</th>
      <th>E-Mail</th>
      <th>Profissão</th>


    </tr>
  </thead>

  <tfoot>
    <tr>
      <th>
        Nome
      </th>
      <th>
        E-Mail
      </th>
      <th>
        Profissão
      </th>



    </tr>
  </tfoot>

  <tbody>
    <td>Tiago Ferezin</td>
    <td>[email protected]</td>
    <td>Programador</td>

  </tbody>
</table>