자바스크립트 엑셀다운 문의드립니다.

//엑셀다운
        $(document).ready(function(){
            function itoStr($num){
                $num < 10 ? $num = '0'+$num : $num;
                return $num.toString();
            }
            var btn = $('#btnExcel');
            var tbl = 'excel_list';
            btn.click(function(e){
                var dt = new Date();
                var year = itoStr( dt.getFullYear() );
                var month = itoStr( dt.getMonth() + 1 );
                var day = itoStr( dt.getDate() );
                var postfix = year + month + day;
                var fileName = "text_"+ postfix + ".xls";
                var a = document.createElement('a');
                var data_type = 'data:application/vnd.ms-excel';
                var table_div = document.getElementById( tbl );
                var table_html = table_div.outerHTML.replace(/ /g, '%20');
                a.href = data_type + ', ' + table_html;
                a.download = fileName;
                a.click();
                e.preventDefault();
                getFunc();
            });
        });