drb/config/excel/productTable.php

<?php
return [
    [
        'key' =>'title',
        'value' => '* 产品名称',
    ],
    [
        'key' =>'code',
        'value' => '* 产品编码',
    ],
    [
        'key' =>'product_category_id',
        'value' => '* 产品分类',
    ],
    [
        'key' =>'size',
        'value' => '产品规格',
    ],
    [
        'key' =>'unit',
        'value' => '产品单位',
    ],
    [
        'key' =>'bar_code',
        'value' => '条码',
    ],
    [
        'key' =>'cost',
        'value' => '成本',
    ],
    [
        'key' =>'retail_price',
        'value' => '零售价',
    ],
];