javascript save table as excel

1     <button  type="button" id="export" onclick="exportTableToExcel('tblData')">Export List</button>
2
3<script>
4    function exportTableToExcel(tableID, filename = '') {
5        var downloadLink;
6        var dataType = 'application/vnd.ms-excel';
7        var tableSelect = document.getElementById(tableID);
8        var tableHTML = tableSelect.outerHTML.replace(/ /g, '%20');
9
10        // Specify file name
11        filename = filename ? filename + '.xls' : 'excel_data.xls';
12
13        // Create download link element
14        downloadLink = document.createElement("a");
15
16        document.body.appendChild(downloadLink);
17
18        if (navigator.msSaveOrOpenBlob) {
19            var blob = new Blob(['\ufeff', tableHTML], {
20                type: dataType
21            });
22            navigator.msSaveOrOpenBlob(blob, filename);
23        } else {
24            // Create a link to the file
25            downloadLink.href = 'data:' + dataType + ', ' + tableHTML;
26            // Setting the file name
27            downloadLink.download = filename;
28
29            //triggering the function
30            downloadLink.click();
31        }
32    }
33</script>