'decimal:4', ]; public static function columnLabels(): array { return [ 'source' => '来源', 'part' => '成品配件', 'transaction_no' => '交易单号', 'express_no' => '快递单号', 'barcode' => '条形码', 'shop_name' => '店铺名称', 'freight_amount' => '提供成本运费', ]; } public static function fieldTypes(): array { return [ 'freight_amount' => 'currency', ]; } }