How to make use of it:

1. Add each jQuery JavaScript library and the export_csv_plugin.js script to the HTML web page.

<script src="https://code.jquery.com/jquery-1.12.4.min.js">
</script>
<script src="export_csv_plugin.js"></script>

2. Export your HTML table right into a CSV file.

$.exportCSV(
  [
    this, // Do not change
    '.demo',
    3, 
    ['Column 1', 'Column 2', 'Column 3'], 
    'download',
    '-',
    '_',
    10
  ]
);

Basic Table To CSV Exporter, Export CSV Plugin/Github, export html table to xlsx using jquery

See Demo And Download