Exportar a XLS con Javascript

function exportarXls(tableId, nombre = ''){
	nombre = (nombre) ? nombre: 'spreadsheet'
	var uri = 'data:application/vnd.ms-excel;base64,'
	, template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><meta http-equiv="content-type" content="application/vnd.ms-excel; charset=UTF-8"><head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>'
	, base64 = function (s) { return window.btoa(unescape(encodeURIComponent(s))) }
	, format = function (s, c) { return s.replace(/{(\w+)}/g, function (m, p) { return c[p]; }) }

	 var table = document.getElementById(tableId)
	 var ctx = { worksheet: nombre|| 'Worksheet', table: table.innerHTML }

	 var enlaceTmp = document.createElement('a');
	 enlaceTmp.href =  uri + base64(format(template, ctx));
   enlaceTmp.download = nombre+ '.xls';
   enlaceTmp.click();
}

<button class="btn btn-success" onclick="exportarXls('atributoId', 'nombreArchivo')">XLS</button>

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