Adicionar botões de download no datatable

//css
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.25/css/jquery.dataTables.css">
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/buttons/1.7.1/css/buttons.dataTables.min.css">

$('#table').DataTable({
  	dom: 'Bfrtip',
    buttons: [
      'pageLength',
      'copyHtml5',
      'excelHtml5',
      'csvHtml5',
      'pdfHtml5',
      'print'
	]
})

//js
<script type="text/javascript" language="javascript" src='https://cdn.datatables.net/1.12.0/js/jquery.dataTables.min.js' defer></script>
<script type="text/javascript" language="javascript" src='https://cdn.datatables.net/buttons/2.2.3/js/dataTables.buttons.min.js' defer></script>
<script type="text/javascript" language="javascript" src='https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.3/jszip.min.js' defer></script>
<script type="text/javascript" language="javascript" src='https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.53/pdfmake.min.js' defer></script>
<script type="text/javascript" language="javascript" src='https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.53/vfs_fonts.js' defer></script>
<script type="text/javascript" language="javascript" src='https://cdn.datatables.net/buttons/2.2.3/js/buttons.html5.min.js' defer></script>
<script type="text/javascript" language="javascript" src='https://cdn.datatables.net/buttons/2.2.3/js/buttons.print.min.js' defer></script>
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