链式操作增强

    //填充表头

    $title = ['产品'，'颜色'，'尺码'，'sku']

    $exporter->append($title);

    //填充数据

    $list = Product::with(["color","size"])->get()->toArray();

    $exporter->append($list,['name','color.name','size.name|未设定尺码','sku']);

    //设置保护

    $exporter->setUnprotectRange("A1:B".$exporter->getCurrentRowIndex());

    $exporter->download(Exporter::DOWNLOAD_TYPE_STREAM,"产品数据");

    $exporter->append($title)

    ->append($list,['name','color.name','size.name|未设定尺码','sku'])//填充数据

    ->setUnprotectRange("A1:B".$exporter->getCurrentRowIndex())//设置保护

    ->download(Exporter::DOWNLOAD_TYPE_STREAM,"产品数据");//下载数据

```

2、导出Excel，使用模板的情况

    $exporter->addSheet('颜色参考表', true);

    //填充表头

    $title = ['颜色id'，'中文颜色名'，'英文颜色名']

    $exporter->append($title);

    $exporter->append(Color::get(["id", "cn_name", "en_name"]));

    $exporter->append($title)

    ->append(Color::get(["id", "cn_name", "en_name"]))

    ->setUnprotectRange();//全表保护

    //设置保护

    $exporter->setUnprotectRange();//全表保护

    //使用别的sheet表

    $exporter->setSheetByIndex(0);

    $exporter->setBeginRowIndex(2);//从第二行开始填充数据

    $exporter->setBeginColumnChar("C");//从第三列开始填充数据

    $exporter->setSheetByIndex(0)->setBeginRowIndex(2)->setBeginColumnChar("C");//从第三列开始填充数据

    //填充数据

    $list = Product::with(["color","size"])->get()->toArray();

    $exporter->append($list,['name','color.name','size.name|未设定尺码','sku']);

        if ($activeSheet) {

            $this->setSheetByName($name);

        }

        return $this;

    }

    /** 根据名字sheet表名激化切换到 该表