layui框架怎么导出excel表格

<button type="button" lay-submit="" class="layui-btn layui-btn-warm" lay-filter="uploadImg">
    <i class="layui-icon"></i>导出Excel</button>


layui.use([&#39;layer&#39;, &#39;form&#39;, &#39;table&#39;, &#39;laydate&#39;,&#39;jquery&#39;], function () {
    var $ = layui.jquery,
        layer = layui.layer,
        form = layui.form,
        laydate = layui.laydate,
        table = layui.table;

 
    // 加载框
    var loading;

    loading = layer.load(1, {shade: [0.3, &#39;#fff&#39;]});

    var tableIns = table.render({
        elem: &#39;#tableList&#39;,
        // cellMinWidth: 100,
        cols: [[
            {field: &#39;sdId&#39;, width: 60, title: &#39;ID&#39;, sort: true}
            , {field: &#39;sdMoney&#39;, width: 87,title: &#39;交易金额&#39;,templet:&#39;#cashDepositTpl&#39;}
            , {field: &#39;sdTime&#39;, minWidth: 87, title: &#39;交易时间&#39;}
            , {field: &#39;sdType&#39;, width: 300,title: &#39;交易类型&#39;, templet: &#39;#sdTypeTpl&#39;}
            , {field: &#39;sdWater&#39;, minWidth: 120, title: &#39;交易流水编号&#39;}
            , {field: &#39;orderFormEntity&#39;, minWidth: 68,title: &#39;订单号&#39;, templet: &#39;#orderFormTpl&#39;}
        ]],
        url:&#39;${WEB_URL}terraceZL/getList&#39;,
        page: true,
        even: false,
        height: &#39;full-90&#39;,
        request: {
            pageName: &#39;page&#39; //页码的参数名称，默认：page
            , limitName: &#39;limit&#39; //每页数据量的参数名，默认：limit
        },
        limit: 50,
        done: function (res, curr, count) {
            layer.close(loading);
        }
    });

   
  

    form.on(&#39;submit(uploadImg)&#39;, function(data){
        loading = layer.load(1, {shade: [0.3, &#39;#fff&#39;]});
        var $ = layui.jquery;
        var excel = layui.excel;
        $.ajax({
            url: &#39;${WEB_URL}sellDeal/getTreeList&#39;,
            dataType: &#39;json&#39;,
            data: {
                datas:JSON.stringify(data.field)
            },
            success: function(res) {
                layer.close(loading);
                layer.msg(res.msg);
                // 假如返回的 res.data 是需要导出的列表数据
                console.log(res.data);//
                // 1. 数组头部新增表头
                res.data.unshift({sdId: &#39;ID&#39;,sdMoney: &#39;交易金额&#39;,sdTime:&#39;交易时间&#39;,type:&#39;交易类型&#39;,sdWater:&#39;交易流水编号&#39;,order:&#39;订单号&#39;});
                // 3. 执行导出函数，系统会弹出弹框
                excel.exportExcel({
                    sheet1: res.data
                }, &#39;平台流水.xlsx&#39;, &#39;xlsx&#39;);
            },
            error:function(res){
                layer.close(loading);
                layer.msg(res.msg);
            }
        });
    });
});

Controller:
@RequestMapping("/getList")
    @ResponseBody
    public Object getList(HttpServletRequest request, Model model) {

        model.addAttribute("WEB_URL", ServiceUrl.WEB_URL);
        model.addAttribute("WEB_NAME", ServiceUrl.WEB_NAME);

        Map<String, Object> paramsMap = JSONObject.parseObject(request.getParameter("datas"), Map.class);
        if (paramsMap == null) {
            paramsMap = new HashMap<String, Object>();
        }

        Map<String, Object> map = new HashMap<String, Object>();

        try {
            List<SellDealEntity> mList = new ArrayList<SellDealEntity>();
            Integer count = sellDealService.getCountZL(paramsMap);

            List<SellDealExcelEntity> list = new ArrayList<>();
            if (count > 0) {
                //查询所有数据
                mList = sellDealService.getListExcel(paramsMap);
                for (SellDealEntity sellDealEntity : mList) {
                    //自定义一个新实体类，定义好要导出来的字段，把遍历出来的数据存放到一个新的list，因为会出现关联表的数据
                    SellDealExcelEntity sellDeal = new SellDealExcelEntity();
                    sellDeal.setSdId(sellDealEntity.getSdId());
                    sellDeal.setShopName(sellDealEntity.getSellEntity().getShopName());
                    sellDeal.setSdTime(sellDealEntity.getSdTime());
                    //时间格式可能不对，备用
//                DateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
//                String time = format.format(sellDealEntity.getSdTime());
                    //根据类型 set 对应的值
                    switchType(sellDealEntity,sellDeal);
                    sellDeal.setSdWater(sellDealEntity.getSdWater());
                    //判断如果订单是null，就set " - "
                    if (sellDealEntity.getOrderFormEntity()==null){
                        sellDeal.setOrder("-");
                    }else {
                        sellDeal.setOrder(sellDealEntity.getOrderFormEntity().getOfOrder());
                    }
                    list.add(sellDeal);
                }
            }

            map.put("code", 0);
            map.put("msg", "导出成功");
            map.put("count", count);
            map.put("data", list);
        }catch (Exception e){
            map.put("code", 1);
            map.put("msg", "导出失败，请稍后重试！");
        }


        return JSON.toJSON(map);
    }

    private void switchType(SellDealEntity sellDealEntity,SellDealExcelEntity sellDeal) {
        switch (sellDealEntity.getSdType()) {
            case 0:
                sellDeal.setType("订单收益");
                sellDeal.setSdMoney("+"+sellDealEntity.getSdMoney().toString());
                break;
            case 1:
                sellDeal.setType("售后退款");
                sellDeal.setSdMoney("-"+sellDealEntity.getSdMoney().toString());
                break;
            case 2:
                sellDeal.setType("缴纳保证金");
                sellDeal.setSdMoney("+"+sellDealEntity.getSdMoney().toString());
                break;
            case 3:
                sellDeal.setType("保证金充值");
                sellDeal.setSdMoney("+"+sellDealEntity.getSdMoney().toString());
                break;
            case 4:
                sellDeal.setType("保证金扣除");
                sellDeal.setSdMoney("-"+sellDealEntity.getSdMoney().toString());
                break;
            case 5:
                sellDeal.setType("余额提现");
                sellDeal.setSdMoney("-"+sellDealEntity.getSdMoney().toString());
                break;
            case 6:
                sellDeal.setType("保证金提现");
                sellDeal.setSdMoney("-"+sellDealEntity.getSdMoney().toString());
                break;
            case 7:
                sellDeal.setType("保证金提现手续费");
                sellDeal.setSdMoney("+"+sellDealEntity.getSdMoney().toString());
                break;
            case 8:
                sellDeal.setType("余额提现手续费");
                sellDeal.setSdMoney("+"+sellDealEntity.getSdMoney().toString());
                break;
            case 9:
                sellDeal.setType("订单服务费");
                sellDeal.setSdMoney("+"+sellDealEntity.getSdMoney().toString());
                break;
            default:
                sellDeal.setType("暂无类型");
                sellDeal.setSdMoney("0");
        }
    }