private function urlNum($num,$page){

    $str = str_replace(urlencode('[PAGE]'), $page, $this->url);

    return str_replace(urlencode('[NUM]'), $num,  $str);

}

<?php

// +----------------------------------------------------------------------

// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]

// +----------------------------------------------------------------------

// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.

// +----------------------------------------------------------------------

// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )

// +----------------------------------------------------------------------

// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>

// +----------------------------------------------------------------------

namespace Think;

class Page{

    public $firstRow; // 起始行数

    public $listRows; // 列表每页显示行数

    public $parameter; // 分页跳转时要带的参数

    public $totalRows; // 总行数

    public $totalPages; // 分页总页面数

    public $rollPage   = 11;// 分页栏每页显示的页数

    public $lastSuffix = true; // 最后一页是否显示总页数

    private $p       = 'p'; //分页参数名

    private $num       = 'num'; //分页参数名

    private $url     = ''; //当前链接URL

    private $nowPage = 1;

    // 分页显示定制

    private $config  = array(

        'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',

        'prev'   => '«',

        'next'   => '»',

        'first'  => '1...',

        'last'   => '...%TOTAL_PAGE%',

        'theme'  => '%HEADER% %FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%',

    );

    /**

     * 架构函数

     * @param array $totalRows  总的记录数

     * @param array $listRows  每页显示记录数

     * @param array $parameter  分页跳转的参数

     */

    public function __construct($totalRows, $listRows=20, $parameter = array()) {

        C('VAR_PAGE') && $this->p = C('VAR_PAGE'); //设置分页参数名称

        /* 基础设置 */

        $this->totalRows  = $totalRows; //设置总记录数

        $this->listRows   = $listRows;  //设置每页显示行数

        $this->parameter  = empty($parameter) ? $_GET : $parameter;

        $this->nowPage    = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);

        $this->nowPage    = $this->nowPage>0 ? $this->nowPage : 1;

        $this->firstRow   = $this->listRows * ($this->nowPage - 1);

    }

    /**

     * 定制分页链接设置

     * @param string $name  设置名称

     * @param string $value 设置值

     */

    public function setConfig($name,$value) {

        if(isset($this->config[$name])) {

            $this->config[$name] = $value;

        }

    }

    /**

     * 生成链接URL

     * @param  integer $page 页码

     * @return string

     */

    private function url($page){

        // return str_replace(urlencode('[PAGE]'), $page, $this->url);

        $num = $_GET['num'] ? $_GET['num'] : '10';

        $str = str_replace(urlencode('[NUM]'), $num,   $this->url);

        return str_replace(urlencode('[PAGE]'), $page, $str);

    }

    private function urlNum($num,$page){

        $str = str_replace(urlencode('[PAGE]'), $page, $this->url);

        return str_replace(urlencode('[NUM]'), $num,  $str);

    }

    /**

     * 组装分页链接

     * @return string

     */

    public function show() {

        if(0 == $this->totalRows) return '';

        /* 生成URL */

        // echo $this->num;die;

        $this->parameter[$this->p] = '[PAGE]';

        // $num = empty($_GET['num']) ? '20' : '';

        $this->parameter[$this->num] = '[NUM]';

        $this->url = U(ACTION_NAME, $this->parameter);

        /* 计算分页信息 */

        $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数

        if(!empty($this->totalPages) && $this->nowPage > $this->totalPages) {

            $this->nowPage = $this->totalPages;

        }

        /* 计算分页临时变量 */

        $now_cool_page      = $this->rollPage/2;

        $now_cool_page_ceil = ceil($now_cool_page);

        $this->lastSuffix && $this->config['last'] = $this->totalPages;

        //上一页

        $up_row  = $this->nowPage - 1;

        $up_page = $up_row > 0 ? '<li><a class="prev" href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a></li>' : '';

        //下一页

        $down_row  = $this->nowPage + 1;

        $down_page = ($down_row <= $this->totalPages) ? '<li><a class="next" href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a></li>' : '';

        //第一页

        $the_first = '';

        if($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1){

            $the_first = '<li><a class="first" href="' . $this->url(1) . '">' . $this->config['first'] . '</a></li>';

        }

        //最后一页

        $the_end = '';

        if($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages){

            $the_end = '<li><a class="end" href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a></li>';

        }

        //数字连接

        $link_page = "";

        for($i = 1; $i <= $this->rollPage; $i++){

            if(($this->nowPage - $now_cool_page) <= 0 ){

                $page = $i;

            }elseif(($this->nowPage + $now_cool_page - 1) >= $this->totalPages){

                $page = $this->totalPages - $this->rollPage + $i;

            }else{

                $page = $this->nowPage - $now_cool_page_ceil + $i;

            }

            if($page > 0 && $page != $this->nowPage){

                if($page <= $this->totalPages){

                    $link_page .= '<li><a class="num" href="' . $this->url($page) . '">' . $page . '</a></li>';

                }else{

                    break;

                }

            }else{

                if($page > 0 && $this->totalPages != 1){

                    $link_page .= '<li class="am-active"><a href="#">' . $page . '</a></li>';

                }

            }

        }

        //替换分页内容

        $page_str = str_replace(

            array('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%'),

            array($this->config['header'], $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages),

            $this->config['theme']);

            return "<ul class='am-pagination am-pagination-right'>{$page_str}</ul>

                    <div class='am-dropdown  am-dropdown-up' data-am-dropdown>

                        <button class='am-btn am-btn-primary am-dropdown-toggle' data-am-dropdown-toggle>显示条数 <span class='am-icon-caret-up'></span></button>

                        <ul class='am-dropdown-content'>

                            <li><a href='".$this->urlNum(10,1)."'>10</a></li>

                            <li><a href='".$this->urlNum(30,1)."'>30</a></li>

                            <li><a href='".$this->urlNum(50,1)."'>50</a></li>

                        </ul>

                    </div>";

    }

}