问如何在HTML中导出select标记的选定值

EN

        <!-- 1 -->
        <table id="table1">
          <p>Table 1</p><hr>
          <tr><td>Question 1:</td>
          <td><select>
            <option value="0">0</option>
            <option value="1">1</option>
          </select></td></tr>
          <tr><td>Question 2:</td>
          <td><select>
            <option value="0">0</option>
            <option value="1">1</option>
          </select></td></tr>
        </table>

        <!-- 2 -->
        <p>Table 2</p><hr>
        <table id="table2">
          <tr><td>Question 3:</td>
          <td><select>
            <option value="0">0</option>
            <option value="1">1</option>
          </select></td></tr>
          <tr><td>Question 4:</td>
          <td><select>
            <option value="0">0</option>
            <option value="1">1</option>
          </select></td></tr>
        </table>

        <!-- 3 -->
        <p>Table 3</p><hr>
        <table id="table3">
          <tr><td>Question 5:</td>
          <td><select>
            <option value="0">0</option>
            <option value="1">1</option>
          </select></td></tr>
          <tr><td>Question 6:</td>
          <td><select>
            <option value="0">0</option>
            <option value="1">1</option>
          </select></td></tr>
        </table>
        <button  onclick="tablesToExcel(['table1','table2','table3'], ['Summary','SectionA', 'SectionB'], 'TestBook.xls', 'Excel')">Export to Excel</button>
        <script>
          var tablesToExcel = (function() {
          var uri = 'data:application/vnd.ms-excel;base64,'
          , tmplWorkbookXML = '<?xml version="1.0"?><?mso-application progid="Excel.Sheet"?><Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">'
            + '<DocumentProperties xmlns="urn:schemas-microsoft-com:office:office"><Author>Axel Richter</Author><Created>{created}</Created></DocumentProperties>'
            + '<Styles>'
            + '<Style ss:ID="Currency"><NumberFormat ss:Format="Currency"></NumberFormat></Style>'
            + '<Style ss:ID="Date"><NumberFormat ss:Format="Medium Date"></NumberFormat></Style>'
            + '</Styles>'
            + '{worksheets}</Workbook>'
          , tmplWorksheetXML = '<Worksheet ss:Name="{nameWS}"><Table>{rows}</Table></Worksheet>'
          , tmplCellXML = '<Cell{attributeStyleID}{attributeFormula}><Data ss:Type="{nameType}">{data}</Data></Cell>'
          , 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]);
              for (var j = 0; j < tables[i].rows.length; j++) {
                rowsXML += '<Row>'
                for (var k = 0; k < tables[i].rows[j].cells.length; 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 += '</Row>'
              }
              ctx = {rows: rowsXML, nameWS: wsnames[i] || 'Sheet' + i};
              worksheetsXML += format(tmplWorksheetXML, ctx);
              rowsXML = "";
            }

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

        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);
          }
          var rows = document.querySelectorAll("table tr");
        })();
        </script>