title: Excel export - Sum all the values of the column
body: <p>I have a report, using DataTables with JQuery, using the export functionality of HTML5. I have the following columns</p>
  
  <p><code>Code</code> | <code>Initial date</code> | <code>End Date</code> | <code>Collection Status</code> | <code>Amount to be paid</code></p>
  
  <p>To export from my excel, I use following code:</p>
  
  <pre><code>buttons : [
      {
          extend : 'excelHtml5',
          exportOptions: {
              columns: ':visible',
              format: {
                  body: function(data, row, column, node) {
                      return data.replace(',', '.');
                  }
              }
          },
          className : 'btn btn-primary pull-right',
          text : 'Descargar &lt;i class="glyphicon glyphicon-export"&gt;&lt;/i&gt;',
          customize : function(xlsx) {
              var sheet = xlsx.xl.worksheets['sheet1.xml'];
              $('row c', sheet).attr('s', '25');
              $('row:first c', sheet).attr('s', '27');
          }
      },
      ....
  ]
  </code></pre>
  
  <p>I would like to get the sum of all of the values at the end, how can I achieve this?</p>