JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdn.datatables.net/v/dt/jq-3.3.1/jszip-2.5.0/dt-1.10.20/b-1.6.1/b-colvis-1.6.1/b-html5-1.6.1/r-2.2.3/datatables.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/pdfmake.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/vfs_fonts.js"></script>
<script src="https://cdn.datatables.net/v/dt/jq-3.3.1/jszip-2.5.0/dt-1.10.20/b-1.6.1/b-colvis-1.6.1/b-html5-1.6.1/r-2.2.3/datatables.min.js"></script>
<script src="https://code.iconify.design/2/2.0.3/iconify.min.js"></script>
<div class="container">
      <table id="example" class="display nowrap" width="100%">
        <thead>
          <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>           
            <th class="not-export-col">opr</th>

          </tr>
        </thead>

        <tfoot>
          <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
                        <th class="not-export-col">opr</th>

          </tr>
        </tfoot>

        <tbody>
          <tr>
            <td>Tiger Nixon</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$3,120</td>
            <td><a href="www.google.com"><i class="wb-edit"></i></a></td>
          </tr>
          <tr>
            <td>Garrett Winters</td>
            <td>Director</td>
            <td>Edinburgh</td>
            <td>63</td>
            <td>2011/07/25</td>
            <td>$5,300</td>
            <td><a href="www.google.com"><span class="iconify" data-icon="fa:edit"></span></a></td>
          </tr>
          <tr>
            <td>Ashton Cox</td>
            <td>Technical Author</td>
            <td>San Francisco</td>
           ...

CSS

body {
  font: 90%/1.45em "Helvetica Neue", HelveticaNeue, Verdana, Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
  background-color: #fff;
}

JavaScript

$(document).ready(function(){
			var arrayCol = new Array();
			var table = $('#example').DataTable({
				dom: 'B<"top"iflp<"clear">>rt<"bottom"ip<"clear">>',
				initComplete:function (  ) {
					var len = this.api().columns().count();
					var array =  Array.from(Array(len).keys());
					arrayCol = array.reverse();
				  },
			buttons: [
      { 
        extend: 'pdf',
        text: 'To PDF',
        exportOptions: {
          rows: function ( idx, data, node ) {
            return data.reverse();
          },
          format: {
          columns: ':visible:not(.not-export-col)', 
            header: function ( data, idx, node ) {
              var headers = $('#example').DataTable().table().header();
              var reversedHeaders = headers.innerText.split('\t').reverse();
              return reversedHeaders[idx];
            }
          }
        }
      },
               { 
        extend: 'excel',
        text: 'exel',
        exportOptions: {
        columns: ':visible:not(.not-export-col)', 
          rows: function ( idx, data, node ) {
            return data.reverse();
          },
          format: {
            header: function ( data, idx, node ) {
              var headers = $('#example').DataTable().table().header();
              var reversedHeaders = headers.innerText.split('\t').reverse();
              return reversedHeaders[idx];
            }
          }
        }
      }
    ]
				});
		});