Js导出页面数据

场景：导出当前页数据，不通过后台再次下载数据

代码：

/**
*@param fileName 导出文件名
* @param id 页面上需要导出数据的组件ID
* @returns
*/
var createExcle = function (id,fileName){
    var table = $(document.getElementById(id)).clone();
    table.attr('id','datatab');
    table.appendTo('body');
    method5('datatab');
    datatab.remove();

    function method5(tableid) {
        var idTmr;
        var tableToExcel = (function() {
           　　 var uri = 'data:application/vnd.ms-excel;base64,',
                    template = '<html><head><meta charset="UTF-8"></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) {
                　　if (!table.nodeType) table = document.getElementById(table)
                　　var ctx = {worksheet: name || 'Worksheet', table: table.innerHTML}
               　　 // window.location.href = uri + base64(format(template, ctx))
                var aTag = document.createElement('a');
                aTag.download = fileName;
                aTag.href = uri + base64(format(template, ctx));
                document.body.appendChild(aTag);
                aTag.onclick = function () {
                    document.body.removeChild(aTag);
                }
                aTag.click();
            }
        })()

        if(getExplorer()=='ie')
        {
            var curTbl = document.getElementById(tableid);
            var oXL = new ActiveXObject("Excel.Application");
            var oWB = oXL.Workbooks.Add();
            var xlsheet = oWB.Worksheets(1);
            var sel = document.body.createTextRange();
            sel.moveToElementText(curTbl);
            sel.select();
            sel.execCommand("Copy");
            xlsheet.Paste();
            oXL.Visible = true;

            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);
                oXL.Quit();
                oXL = null;
                idTmr = window.setInterval("Cleanup();", 1);
            }

        }
        else
        {
            tableToExcel(tableid)
        }

        function Cleanup() {
            window.clearInterval(idTmr);
            CollectGarbage();
        }

        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';
            }
        }
    }
}