前端实现table表格导出excel

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .tb-head{
            background-color: #ccc;
        }
    </style>
<head>
<script type="text/javascript" language="javascript">
　　　　//处理除了行内样式以外的css样式，导出excel时只能读取到行内样式，要讲非行内样式转化成行内样式
        window.onload = function(){
            var tbhead = document.getElementsByClassName("tb-head");
            var computedStyle = document.defaultView.getComputedStyle(tbhead[0], null);
            console.log(computedStyle.backgroundColor);
            tbhead[0].style.backgroundColor = computedStyle.backgroundColor;
        }

        var idTmr;
        function  getExplorer() {
            var explorer = window.navigator.userAgent ;
            //ie
            if (explorer.indexOf("MSIE") >= 0) {
                return 'ie';
            }
            //firefox
            else if (explorer.indexOf("Firefox") >= 0) {
                return 'Firefox';
            }
            //Chrome
            else if(explorer.indexOf("Chrome") >= 0){
                return 'Chrome';
            }
            //Opera
            else if(explorer.indexOf("Opera") >= 0){
                return 'Opera';
            }
            //Safari
            else if(explorer.indexOf("Safari") >= 0){
                return 'Safari';
            }
        }
        function method1(tableid) {//整个表格拷贝到EXCEL中
            if(getExplorer()=='ie')
            {
                var curTbl = document.getElementById(tableid);
                var oXL = new ActiveXObject("Excel.Application");

                //创建AX对象excel
                var oWB = oXL.Workbooks.Add();
                //获取workbook对象
                var xlsheet = oWB.Worksheets(1);
                //激活当前sheet
                var sel = document.body.createTextRange();
                sel.moveToElementText(curTbl);
                //把表格中的内容移到TextRange中
                sel.select;
                //全选TextRange中内容
                sel.execCommand("Copy");
                //复制TextRange中内容
                xlsheet.Paste();
                //粘贴到活动的EXCEL中
                oXL.Visible = true;
                //设置excel可见属性

                try {
                    var fname = oXL.Application.GetSaveAsFilename("Excel.xls", "Excel Spreadsheets (*.xls), *.xls");
                } catch (e) {
                    print("Nested catch caught " + e);
                } finally {
                    oWB.SaveAs(fname);

                    oWB.Close(savechanges = false);
                    //xls.visible = false;
                    oXL.Quit();
                    oXL = null;
                    //结束excel进程，退出完成
                    //window.setInterval("Cleanup();",1);
                    idTmr = window.setInterval("Cleanup();", 1);

                }

            }
            else
            {
                tableToExcel(tableid)
            }
        }
        function Cleanup() {
            window.clearInterval(idTmr);
            CollectGarbage();
        }
        var tableToExcel = (function() {
                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"><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]; })
                            };
                return function(table, name) {
                        debugger;
                        if (!table.nodeType) table = document.getElementById(table);
                        var ctx = {worksheet: name || 'Worksheet', table: table.innerHTML};
                        window.location.href = uri + base64(format(template, ctx));
                    }
        })()
    </script>

</head>
<body>
<!-- <table id="ta">
  <tr>
    <td>1</td><td>admin</td>
    <td>23</td><td>程序员</td>
    <td>天津</td><td>admin@kali.com</td>
  </tr>
  <tr>
    <td>2</td><td>guest</td>
    <td>23</td><td>测试员</td>
    <td>北京</td><td>guest@kali.com</td>
  </tr>
</table> -->
<table id="tb" border=4 width=250 align=center>
        <caption>【表格举例】</caption>
        <tr class="tb-head">
            <th><br></th>
            <th>列-A</th>
            <th>列-B</th>
            <th>列-C</th>
        </tr>
        <tr align=center>
            <td>行-1</td>
            <td>A1</td>
            <td>B1</td>
            <td rowspan=2>C1-C2</td>
        </tr>
        <tr align=center>
            <td>行-2</td>
            <td>A2</td>
            <td>B2</td>
        </tr>
        <tr align=center>
            <td>行-3</td>
            <td>A3</td>
            <td colspan=2>A3-B3</td>
        </tr>
    </table>
<input id="Button1" type="button" value="导出EXCEL"
        onclick="method1('tb')" />
</body>
</html>