code: public function getPageUrl($page, $rows = null) 
      {        
          $rows || $rows = $this->rows;
          $url = $this->uri;
                  
          if ($this->allowCustomRows) {
              $url .= "{$this->argSeparator}{$this->rowsVar}{$this->valSeparator}{$rows}";
          }
          
          if ($page > 1) {
              $url .= "{$this->argSeparator}{$this->pageVar}{$this->valSeparator}{$page}";
          }
          
          $url = str_replace("?&", '?', $url);
          
          $url .= $this->uriQuery;
          
          return $url;
      }
docs: 根据参数生成URL
  @param int $page 页码
  @param int $rows = null 为null时使用$this->rows的值
  @return string