数据导入，前端使用layui excel 插件

按钮

<div class="btn-upload customer-list-doImport-btn">
	<a class="layui-btn layui-btn-primary">选择文件</a>
	<input type="file" title="" 
		class="input-file" 
		id="customer-black-excel-file"
		accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
</div>
<button 
	class="layui-btn disabled customer-list-doImport-btn" 
	lay-submit lay-filter="customer-import-list-upload-btn-submit" disabled
	id="customer-import-list-upload-btn-submit">开始导入
</button>

JS 关键代码

var files = '', returnData = "";
$('#customer-black-excel-file').change(function (e) {
	// 注意：这里直接引用 e.target.files 会导致 FileList 对象在读取之前变化，导致无法弹出文件
	files = Object.values(e.target.files);

	// 变更完清空，否则选择同一个文件不触发此事件
	e.target.value = '';
	$uploadBtn.removeClass('disabled').prop('disabled', false);
});

form.on('submit(customer-import-list-upload-btn-submit)', function (data) {
	$uploadBtn.addClass('disabled').prop('disabled', true);
	uploadExcel(files, data.field);
	return false;
});

// 上传excel的处理函数，传入文件对象数组
function uploadExcel(files, formData) {
	console.log(files)
	layer.load(2);
	try {
		excel.importExcel(files, {
			// 导入：读取数据的同时梳理数据
			fields: {
				name: 'A',
				mobile: 'B',
				gender: 'C',
				email: 'D',
				weixin: 'E',
				qq: 'F',
				remark: 'G',
			}
		}, function (data) {
			var count = data[0]['sheet1'].length;
			if ((count -1) > importTotalLimit) {
				layer.closeAll('loading');
				return layer.msg("导入条数("+count+")大于单次限制条数")
			}

			admin.req({
				url: url + '/do',
				data: {fileData: data[0]['sheet1'], ...formData},
				success: function (res) {
					layer.closeAll('loading');
					layer.msg(res.msg, {time: 4000})

					table.reload(tableId, {
						page: {curr: 1},
						where: admin.getTableDefOrderBy()
					}, 'data');

					// 显示导入返回的结果
					$('#customer-import-list-return-box').html(laytpl($('#customer-import-list-return-tpl').html()).render({
						data: res,
						files: files
					}));

					// 下载上传数据清单
					if (res.data) {
						returnData = res.data;
						downloadReturnData(returnData, true)
					}
				}, error: function (e) {
					layer.closeAll('loading');
				}
			})
		})
	} catch (e) {
		layer.closeAll('loading');
		layer.msg(e.message)
	}
}

$("body").on("click", "#customer-import-list-return-download-btn", function () {
	if (returnData) {
		downloadReturnData(returnData)
	}
});




function downloadReturnData(returnData, addHead) {
	var colConf = excel.makeColConfig({ 'A': 50, 'Z': 100 }, 110), rowConf = excel.makeRowConfig({ 1: 24 }, 20);
	var dd = new Date(), date = dd.getFullYear() +'-'+ (dd.getMonth()+1) +'-'+ dd.getDate();

	if (addHead) {
		returnData.unshift({
			name: '姓名',
			mobile: '手机号',
			gender: '性别',
			email: '邮箱',
			weixin: '微信',
			qq: 'QQ',
			remark: '备注',
			createTime: '导入时间',
			importResult: '导入结果'
		})
	}

	excel.setExportCellStyle(returnData, 'A1:Z1', {
		s: { alignment: {vertical: 'center'}, font: {bold: true} }
	});

	excel.exportExcel({
		sheet1: returnData
	}, '导入结果清单'+date+'.xlsx', 'xlsx', {
		// 中可以指定某个 sheet 的属性，如果不指定 sheet 则所有 sheet 套用同一套属性
		extend: {
			sheet1: {
				'!cols': colConf,
				'!rows': rowConf
			}
		}
	});
}