主要程序：

di.xml依赖中注入插件：

    ...
    <type name="Magento\Catalog\Model\Config\Source\ListSort">
        <plugin name="Aiweline_ProductSorting::system_config_source_list_sort" type="Aiweline\ProductSorting\Plugin\Model\Config\Source\ListSort" />
    </type>
    ...

插件类：

<?php
/**
 * @DESC      | 文件描述
 *
 * @Author     秋枫雁飞/Aiweline
 * @Email      aiweline@qq.com
 * @Company    成都潮派元素科技
 *
 */
namespace Aiweline\ProductSorting\Plugin\Product\ProductList;
use Aiweline\ProductSorting\Helper\Data;
use Magento\Framework\App\ResourceConnection;
use Magento\Framework\DB\Select;
class Toolbar
{
    private $_subQueryApplied = false;
    private $_collection = null;
    private $_conn = null;
    /**
     * Constructor
     *
     * @param \Magento\Framework\App\ResourceConnection $resource
     */
    public function __construct(ResourceConnection $resource)
    {
        $this->_conn = $resource->getConnection('catalog');
    }
    /**
     * @DESC      | 环绕 设置集合
     *
     * @Author     秋枫雁飞/Aiweline
     * @Email      aiweline@qq.com
     * @Company    成都潮派元素科技
     *
     * @参数区
     * @param \Magento\Catalog\Block\Product\ProductList\Toolbar $subject
     * @param \Closure $proceed
     * @param $collection
     * @return mixed
     */
    public function aroundSetCollection(
        \Magento\Catalog\Block\Product\ProductList\Toolbar $subject,
        \Closure $proceed,
        $collection
    )
    {
        $this->_collection = $collection;
        $currentOrder = $subject->getCurrentOrder();
        // 判断当前排序
        if ($currentOrder) {
            /**@var $subject_collection \Magento\Catalog\Model\ResourceModel\Product\Collection */
            $directionReverse = $this->getCurrentDirectionReverse($subject);
            switch ($currentOrder) {
                case 'newest':
                    $collection->getSelect()->reset(Select::ORDER)->order('created_at ' . $directionReverse);
                    $collection->setPageSize($subject->getLimit())->setCurPage($subject->getCurrentPage());
                    break;
                case 'mostviewed':
                    $reportEventTable = $collection->getResource()->getTable('report_event');
                    $subSelect = $this->_conn->select()->from(
                        ['report_event_table' => $reportEventTable],
                        'COUNT(report_event_table.event_id)'
                    )->where(
                        'report_event_table.object_id = e.entity_id'
                    );
                    $collection->getSelect()->reset(Select::ORDER)->columns(
                        ['views' => $subSelect]
                    )->order(
                        'views ' . $directionReverse
                    );
                    $collection->setPageSize($subject->getLimit())->setCurPage($subject->getCurrentPage());
                    break;
                case 'bestseller':
                    $reportEventTable = $collection->getResource()->getTable('sales_order_item');
                    $subSelect = $this->_conn->select()->from(
                        ['order_item' => $reportEventTable],
                        'COUNT(order_item.product_id)'
                    )->where(
                        'order_item.product_id = e.entity_id'
                    );
                    $collection->getSelect()->reset(Select::ORDER)->columns(
                        ['ordered' => $subSelect]
                    )->order(
                        'ordered ' . $directionReverse
                    );
                    $collection->setPageSize($subject->getLimit())->setCurPage($subject->getCurrentPage());
                    break;
                default:
                    break;
            }
        }
        return $proceed($collection);
    }
    /**
     * @param \Magento\Catalog\Block\Product\ProductList\Toolbar $subject
     * @return string
     */
    function getCurrentDirectionReverse(\Magento\Catalog\Block\Product\ProductList\Toolbar $subject): string
    {
        if ($subject->getCurrentDirection() == 'desc') return 'asc';
        return 'desc';
    }
}