<a class="btn btn-app" onclick="exportExcel()"><i class="fa fa-edit"></i>导出Excel</a>

 //导出Excel
    function exportExcel() {
        var rows = $("#saleGrid").datagrid("getRows");
 
        for (var i = 0; i < rows.length; i++) {    //进行数据处理
            if (isArray(rows[i].OrganizedId)) {
                rows[i].OrganizedId = rows[i].OrganizedId[0];
            }
            if (isArray(rows[i].CustomerId)) {
                rows[i].CustomerId = rows[i].CustomerId[0];
            }
            if (rows[i].AdvanceDate != null) {
                var unix = rows[i].AdvanceDate.replace("/Date(", "").replace(")/", "");
                var un = unix.substring(0, 10);
                var newDate = new Date();
                newDate.setTime(un * 1000);
 
                rows[i].AdvanceDate = newDate.toLocaleString();
            }
            if (rows[i].OrderDate != null) {
                var unix = rows[i].OrderDate.replace("/Date(", "").replace(")/", "");
                var un = unix.substring(0, 10);
                var newDate = new Date();
                newDate.setTime(un * 1000);
 
                rows[i].OrderDate = newDate.toLocaleString();
            }
            if (rows[i].RetainageDate != null) {
                var unix = rows[i].RetainageDate.replace("/Date(", "").replace(")/", "");
                var un = unix.substring(0, 10);
                var newDate = new Date();
                newDate.setTime(un * 1000);
 
                rows[i].RetainageDate = newDate.toLocaleString();
            }
 
            //移除不要的字段
            delete rows[i].SaleAtts;
            delete rows[i].SaleOrderId;
            delete rows[i].SaleOrderItems;
            delete rows[i].SaleStatus;
            delete rows[i].UserName;
            delete rows[i].Customer;
            delete rows[i].AddDate;
 
        }
        var bodyData = JSON.stringify(rows);  //转成json字符串
 
        //替换中文标题
        var a = bodyData.replace(/SaleOrderNo/g, "订单编号").replace(/OrderType/g, "订单类型").replace(/FromWhere/g, "订单来源")
       .replace(/OrganizedId/g, "机构").replace(/SaleUser/g, "销售员").replace(/SaleTc/g, "销售提成").replace(/OrderDate/g, \'订单日期\')
       .replace(/ContractNo/g, "合同编号").replace(/Amount/g, "总额").replace(/Advance/g, "首付款").replace(/AdvanceDate/g, "首付款日期")
       .replace(/PayMethod/g, "支付方式").replace(/Retainage/g, "尾款").replace(/RetainageDate/g, "尾款日期").replace(/InlayPrice/g, "镶嵌款")
       .replace(/CustManager/g, "客户经理").replace(/EquityNo/g, "认股书编号").replace(/LogisticsTotal/g, "物流费用")
       .replace(/Remarks/g, "备注").replace(/CompletedStatus/g, "状态").replace(/CustomerId/g, "终端客户");
 
        var postData = {
            data: a
        };
 
        $.ajax({
            type: "POST",
            url: "ExportExcel",
            data: postData,
            success: function (data) {
                if (data == "1") {
                    layer.msg("操作成功,文件在桌面！", {
                        icon: 6,
                        time: 2000,
                    });
                } else if (data == "-1") {
                    layer.msg("操作失败！", { icon: 2 });
                }
            }
        });
    }

        /// <summary>
        /// 导出Excel
        /// </summary>
        /// <returns></returns>
        public ActionResult ExportExcel()
        {
            string json = Request.Params["data"];
            try
            {
                DataTable dt = ExcelHelper.JsonToDataTable(json);
                string pathDestop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
                ExcelHelper.GridToExcelByNPOI(dt, pathDestop + "\\" + "销售订单-" + DateTime.Now.ToString("yyyy-MM-dd") + "导出" + ".xls");
                return Content("1");
            }
            catch (Exception)
            {
                return Content("-1");
            }
        }

 /// <summary>
    /// 将json转换为DataTable
    /// </summary>
    /// <param name="strJson">得到的json</param>
    /// <returns></returns>
    public static DataTable JsonToDataTable(string strJson)
    {
        //转换json格式
        strJson = strJson.Replace(",\"", "*\"").Replace("\":", "\"#").ToString();
        //取出表名   
        var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase);
        string strName = rg.Match(strJson).Value;
        DataTable tb = null;
        //去除表名   
        strJson = strJson.Substring(strJson.IndexOf("[") + 1);
        strJson = strJson.Substring(0, strJson.IndexOf("]"));
 
        //获取数据   
        rg = new Regex(@"(?<={)[^}]+(?=})");
        MatchCollection mc = rg.Matches(strJson);
        for (int i = 0; i < mc.Count; i++)
        {
            string strRow = mc[i].Value;
            string[] strRows = strRow.Split(\'*\');
               
            //创建表   
            if (tb == null)
            {
                tb = new DataTable();
                tb.TableName = strName;
                foreach (string str in strRows)
                {
                    var dc = new DataColumn();
                    string[] strCell = str.Split(\'#\');
 
                    if (strCell[0].Substring(0, 1) == "\"")
                    {
                        int a = strCell[0].Length;
                        dc.ColumnName = strCell[0].Substring(1, a - 2);
                    }
                    else
                    {
                        dc.ColumnName = strCell[0];
                    }
                    tb.Columns.Add(dc);
                }
                tb.AcceptChanges();
            }
 
            //增加内容   
            DataRow dr = tb.NewRow();
            for (int r = 0; r < strRows.Length; r++)
            {
                try
                {
                    string a = strRows[r].Split(\'#\')[1].Trim();
                    if (a.Equals("null"))
                    {
                        dr[r] = "";
                    }
                    else
                    {
                        dr[r] = strRows[r].Split(\'#\')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", "");
                    }
                }
                catch (Exception e)
                {
                    
                    throw e;
                }
            }
            tb.Rows.Add(dr);
            tb.AcceptChanges();
        }
 
        try
        {
            if (tb != null)
            {
                return tb;
            }
            else
            {
                throw new Exception("解析错误");
            }
        }
        catch (Exception e)
        {
            
            throw e;
        }
    }