EXT中导出表格中的数据到Excel

{
                            itemId: 'excel',
                            text: '导出',
                            iconCls: 'btnExportExcel',
                            disabled: false,
                            handler: function () {
                                //判断数据状态
                                if (tempDate.length == 0) {
                                    var alertbox = Ext.widget('messagebox', { shadow: false });
                                    alertbox.show({
                                        title: '提示',
                                        msg: '结果数据为空！请先进行数据统计分析操作！',
                                        buttons: Ext.Msg.OK,
                                        buttonAlign: 'center',
                                        icon: Ext.Msg.WARNING
                                    });
                                    return;
                                }
                                //预处理tempDate
                                var tempD = [];
                                var buildArr = function (guidspacequery, objtype, layername, pointAlt, wEll) {
                                    this.标识 = guidspacequery;
                                    this.类型 = objtype;
                                    this.所属管类 = layername;
                                    this.点高程 = pointAlt;
                                    this.点类型 = wEll;
                                }
                                for (var i = 0; i < tempDate.length; i++) {
                                    var temp = new buildArr(tempDate[i].guidspacequery, tempDate[i].objtype, tempDate[i].layername, tempDate[i].pointAlt, tempDate[i].wEll);
                                    tempD.push(temp);
                                }
                                //获取gridpanel数据，json为字符串
                                var jsonData = Ext.encode(tempD);
                                var titleData = me.title;

                                //判断浏览器类型是否为IE
                                if (Ext.isIE) {
                                    
                                    //创建‘frmDummy’
                                    if (!Ext.fly('frmDummy')) {
                                        var frm = document.createElement('form');
                                        frm.id = 'frmDummy';
                                        frm.name = "excelid";
                                        frm.className = 'x-hidden';
                                        document.body.appendChild(frm);
                                    }

                                    //传送数据到后台处理成excel
                                    Ext.Ajax.request({
                                        url: 'NetCode/GridToExcel.ashx',
                                        method: 'POST',
                                        form: Ext.fly('frmDummy'),
                                        callback: function (o, s, r) {
                                        },
                                        isUpload: true,
                                        params: { excelContent: jsonData, excelTitle: titleData }
                                    });
                                } else {
                                    var alertbox = Ext.widget('messagebox', { shadow: false });
                                    alertbox.show({
                                        title: '提示',
                                        msg: '请使用IE浏览器！',
                                        buttons: Ext.Msg.OK,
                                        buttonAlign: 'center',
                                        icon: Ext.Msg.WARNING
                                    });
                                    return;
                                }
                            }
                        }