jsp导出会有很多空白行

function tableToExcel(tableID,fileName){
            var table = document.getElementById(tableID);
            var excelContent = table.innerHTML;
            var excelFile = "";
            excelFile += "";
            excelFile += "";
            excelFile += excelContent;
            excelFile += "";
            excelFile += "";
            var link = "data:application/vnd.ms-excel;base64," + base64(excelFile);
            var a = document.createElement("a");
            a.download = fileName+".xls";
            a.href = link;
            a.click();
        }
        function base64 (content) {
            return window.btoa(unescape(encodeURIComponent(content)));
        }

导出第二页往后的数据，前面会有很多空白行，这是啥原因？找了一下午没看出原因

索引插入错了吧？