src/Leevel/Page/Page.php
public function getPerPage(): int
    {
        if (null === $this->perPage) {
            $this->perPage = static::PER_PAGE;
        }

        return $this->perPage;
    }
public function getPerPage(): int
    {
        if (null === $this->perPage) {
            $this->perPage = static::PER_PAGE;
        }

        return $this->perPage;
    }
返回每页数量.

@return int