1.後臺system -> configuration -> catalog -> Search Engine Optimizations

中Use Categories Path for Product URLs  這個設為No

修改getUrl函式

if (empty($requestPath) && $requestPath !== false) {
                $idPath = sprintf('product/%d', $product->getEntityId());
                //以下程式碼註釋
                //if ($categoryId) {
                //    $idPath = sprintf('%s/%d', $idPath, $categoryId);
                //}
                $rewrite = $this->getUrlRewrite();
                $rewrite->setStoreId($storeId)
                    ->loadByIdPath($idPath);
                if ($rewrite->getId()) {
                    $requestPath = $rewrite->getRequestPath();
                    $product->setRequestPath($requestPath);
                } else {
                    $product->setRequestPath(false);
                }
            }