js实现一键导出Excel

想要如下页面，一键导出Excel：

html：

<div class="container">
        <table id="backViewTable" class="table table-hover table-sm table2excel">
            <tr>
                <td>#td>
                <td>IDtd>
                <td>姓名td>
                <td>座位号td>
                <td>操作td>
            tr>
            <tr>
                <th scope="row">1th>
                <td>1234td>
                <td>李文斐td>
                <td>2楼 3排 34号 td>
                <td><input class="btn-primary" type="button" value="删除"/>td>
            tr>
            <tr>
                <th scope="row">2th>
                <td>2345td>
                <td>lwftd>
                <td>1楼 3排 34号td>
                <td><input class="btn-primary" type="button" value="删除"/>td>
            tr>
            <tr>
                <th scope="row">3th>
                <td>3456td>
                <td>Leetd>
                <td>1楼 3排 12号td>
                <td><input class="btn-primary" type="button" value="删除"/>td>
            tr>
        table>
        <button class="btn btn-primary btn-sm" onclick="tablesToExcel(['backViewTable'], ['ProductDay1'], 'TestBook.xls', 'Excel')">Export to Excelbutton>
    div>

js：

<script>
    var tablesToExcel = (function() {
        var uri = 'data:application/vnd.ms-excel;base64,'
            , tmplWorkbookXML = ''
            + 'Axel Richter{created}'
            + ''
            + ''
            + ''
            + ''
            + '{worksheets}'
            , tmplWorksheetXML = '{rows}'
            , tmplCellXML = '{data}'
            , base64 = function(s) { return window.btoa(unescape(encodeURIComponent(s))) }
            , format = function(s, c) { return s.replace(/{(\w+)}/g, function(m, p) { return c[p]; }) }
        return function(tables, wsnames, wbname, appname) {
            var ctx = "";
            var workbookXML = "";
            var worksheetsXML = "";
            var rowsXML = "";

            for (var i = 0; i < tables.length; i++) {
                if (!tables[i].nodeType) tables[i] = document.getElementById(tables[i]);

//              控制要导出的行数
                for (var j = 0; j < tables[i].rows.length; j++) {
                    rowsXML += '';

//                    控制导出的列数（在本例中，最后一列为button,导出的文件会出错，所以导出到倒数第二列
                    for (var k = 0; k < tables[i].rows[j].cells.length-1; k++) {
                        var dataType = tables[i].rows[j].cells[k].getAttribute("data-type");
                        var dataStyle = tables[i].rows[j].cells[k].getAttribute("data-style");
                        var dataValue = tables[i].rows[j].cells[k].getAttribute("data-value");
                        dataValue = (dataValue)?dataValue:tables[i].rows[j].cells[k].innerHTML;
                        var dataFormula = tables[i].rows[j].cells[k].getAttribute("data-formula");
                        dataFormula = (dataFormula)?dataFormula:(appname=='Calc' && dataType=='DateTime')?dataValue:null;
                        ctx = {  attributeStyleID: (dataStyle=='Currency' || dataStyle=='Date')?' ss:StyleID="'+dataStyle+'"':''
                            , nameType: (dataType=='Number' || dataType=='DateTime' || dataType=='Boolean' || dataType=='Error')?dataType:'String'
                            , data: (dataFormula)?'':dataValue
                            , attributeFormula: (dataFormula)?' ss:Formula="'+dataFormula+'"':''
                        };
                        rowsXML += format(tmplCellXML, ctx);
                    }
                    rowsXML += ''
                }
                ctx = {rows: rowsXML, nameWS: wsnames[i] || 'Sheet' + i};
                worksheetsXML += format(tmplWorksheetXML, ctx);
                rowsXML = "";
            }

            ctx = {created: (new Date()).getTime(), worksheets: worksheetsXML};
            workbookXML = format(tmplWorkbookXML, ctx);

//          查看后台的打印输出
            console.log(workbookXML);

            var link = document.createElement("A");
            link.href = uri + base64(workbookXML);
            link.download = wbname || 'Workbook.xls';
            link.target = '_blank';
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        }
    })();
    script>

点击“export to Excel”，便开始下载导出的Excel，，打开如下：

参考链接：Here is Full Example