jQuery实现分页

;(
    function($){
        $.extend({
                "easypage":function(options){
                    options = $.extend({//参数设置
                        contentclass:"contentlist",//要显示的内容的class
                        navigateid:"navigatediv",//导航按钮所在的dom的id
                        everycount:"5",//每页显示多少个
                        navigatecount:"5"//导航按钮一次显示多少个
                        },
                        options);
                    var currentpage = 0;//当前页    
                    var contents = $("."+options.contentclass);//要显示的内容
                    var contentcount = contents.length;//得到内容的个数
                    var pagecount = Math.ceil(contentcount/options.everycount);//计算出页数
                    //拼接导航按钮
                    var navigatehtml = "<div id=‘pagefirst‘ class=‘pagefirst‘><a href=‘javascript:void(0)‘>首页</a></div><div id=‘pagepre‘ class=‘pagepre‘><a href=‘javascript:void(0)‘>上一页</a></div>";
                    for(var i = 1;i <= pagecount;i++){
                            navigatehtml+=‘<div class="pagenavigate"><a href="javascript:void(0)">‘+i+‘</a></div>‘;
                    }
                    navigatehtml+="<div id=‘pagenext‘ class=‘pagenext‘><a href=‘javascript:void(0)‘>下一页</a></div><div id=‘pagelast‘ class=‘pagelast‘><a href=‘javascript:void(0)‘>尾页</a></div>";
                    
                    //加载导航按钮
                    $("#"+options.navigateid).html(navigatehtml);    
                    
                    //得到所有按钮
                    var navigates = $(".pagenavigate");
                    
                    //隐藏所有的导航按钮
                    $.extend({
                        "hidenavigates":function(){
                            navigates.each(function(){
                                $(this).hide();
                            })    
                        }    
                    });
                    
                    //显示导航按钮
                    $.extend({
                        "shownavigate":function(currentnavigate){
                            $.hidenavigates();
                            var begin = currentnavigate>=options.navigatecount?currentnavigate-parseInt(options.navigatecount):0;
                            if(begin>navigates.length-2*options.navigatecount){
                                begin = navigates.length-2*options.navigatecount;    
                            }
                            for(var i = begin;i < currentnavigate+parseInt(options.navigatecount);i++){
                                $(navigates[i]).show();
                            }
                        }    
                    });
                    
                    //高亮显示某个按钮
                    $.extend({
                        "lightnavigate":function(currentnavigate){
                            currentnavigate.addClass("pagenavigateon");    
                        }    
                    });
                    
                    //移除所有高亮按钮
                    $.extend({
                        "removelight":function(){
                            $(".pagenavigateon").each(
                                function(){
                                    $(this).removeClass("pagenavigateon");    
                                }
                            )
                         }    
                    });
                    
                    //显示某页的内容
                    $.extend({
                        "showPage":function(page){
                            contents.each(
                                function(contentindex){
                                    if(contentindex>=page*options.everycount && contentindex < (page+1)*options.everycount){
                                    $(this).show();    
                                    }else{
                                    $(this).hide();    
                                    }
                                }
                            );
                        }
                    });
                    
                    //隐藏前进后退按钮
                    $.extend({
                        "hidePreNext":function(page){
                                if(page==pagecount-1){
                                    $("#pagenext").hide();    
                                    $("#pagelast").hide();
                                    $("#pagepre").show();
                                    $("#pagefirst").show();            
                                }else if(page==0){
                                    $("#pagepre").hide();
                                    $("#pagefirst").hide();    
                                    $("#pagenext").show();    
                                    $("#pagelast").show();    
                                }else{
                                    $("#pagenext").show();
                                    $("#pagepre").show();    
                                    $("#pagefirst").show();    
                                    $("#pagelast").show();    
                                }
                        }    
                    });
                    //显示指定的导航按钮
                    $.shownavigate(0);
                    //隐藏所有的内容
                    $.showPage(0);
                    //开始时隐藏后退按钮
                    $.hidePreNext(0);
                    //高亮显示第一个按钮
                    if(pagecount>0){
                            $.lightnavigate($(navigates.get(0)));
                    }
                    //点击导航按钮
                    $(".pagenavigate").each(
                        function(myindex){
                            $(this).click(
                                function(){
                                    $.showPage(myindex);
                                    $.removelight();
                                    $.lightnavigate($(this));
                                    currentpage = myindex;
                                    $.hidePreNext(currentpage);
                                    var na = Math.floor((currentpage+1)/options.navigatecount)*options.navigatecount;
                                    $.shownavigate(na);    
                                }
                            );
                        }
                    );
                    //点击后退按钮
                    $("#pagepre").click(
                        function(){
                            --currentpage<=0 && (currentpage=0);
                            $.showPage(currentpage);    
                            $.removelight();
                            $.lightnavigate($(navigates.get(currentpage)));
                            $.hidePreNext(currentpage);
                            var na = Math.floor(currentpage/options.navigatecount)*options.navigatecount;
                            $.shownavigate(na);    
                        }
                    );
                    //点击前进按钮
                    $("#pagenext").click(
                        function(){
                            ++currentpage>=pagecount-1 && (currentpage=pagecount-1);
                            $.showPage(currentpage);    
                            $.removelight();
                            $.lightnavigate($(navigates.get(currentpage)));
                            $.hidePreNext(currentpage);
                            
                            var na = Math.floor((currentpage+1)/options.navigatecount)*options.navigatecount;
                            $.shownavigate(na);    
                        }
                    );
                    //点击首页按钮
                    $("#pagefirst").click(
                        function(){
                            currentpage=0;
                            $.showPage(currentpage);    
                            $.removelight();
                            $.lightnavigate($(navigates.get(currentpage)));
                            $.hidePreNext(currentpage);
                            
                            var na = Math.floor((currentpage+1)/options.navigatecount)*options.navigatecount;
                            $.shownavigate(na);    
                        }
                    );
                 //点击尾页按钮
                 $("#pagelast").click(
                         function(){
                             currentpage=pagecount-1;
                             $.showPage(currentpage);    
                            $.removelight();
                            $.lightnavigate($(navigates.get(currentpage)));
                            $.hidePreNext(currentpage);
                            
                            var na = Math.floor((currentpage+1)/options.navigatecount)*options.navigatecount;
                            $.shownavigate(na);    
                         }
                 );
                }
        });
    }
)(jQuery)

<html>
    
    <head>
        <link rel="stylesheet" type="text/css" href="style.css"/> 
        <script type="text/javascript" src="jquery-1.4.4.js">
        </script>
        <script type="text/javascript" src="jquery.easypage.js">
        </script>
        <script type="text/javascript">
            //contentclass   要分页内容的class名称 默认的为contentlist
            //navigateid         放置导航按钮的位置id 默认为mynavigate
            //everycount          每页显示多少个
            //navigatecount     导航按钮开始显示多少个，从第二个开始显示为双倍    
            $(
                function(){
                    $.easypage({‘contentclass‘:‘contentlist‘,‘navigateid‘:‘navigatediv‘,‘everycount‘:5,‘navigatecount‘:5});    
                }
            )
        </script>    
    </head>
        
    <body>
        <div id="contents">
            <div class="contentlist">1.美国宣布新军事战略将重心转向亚太地区</div>
            <div class="contentlist">2.春运期间极端最低温达零下5度</div>
            <div class="contentlist">3.上海妇女社会地位调查结果公布</div>
            <div class="contentlist">4.暖手袋发生漏液有危险 </div>
            <div class="contentlist">5.上海相关调查称新车内挥发性有机物严重超标</div>
            <div class="contentlist">6.申城进入流感高发期</div>
            <div class="contentlist">7.上海仍有部分幼儿园开设各类收费兴趣班 家长支持</div>
            <div class="contentlist">8.达人秀将揭晓复赛阵容 洗碗工麻袋姐走改编路线</div>
            <div class="contentlist">9.苹果侵权中国作家立案 韩寒等9人索赔1200万元</div>
            <div class="contentlist">10.嘉汇广场一商务楼外墙剥落砸伤过路男子(图)</div>
            <div class="contentlist">11.石岚二村小区高空抛物现象严重 多辆轿车被砸</div>
            <div class="contentlist">12.女子从11家银行申领24张信用卡 透支本金45万</div>
            <div class="contentlist">13.松江一家化工厂发生爆炸 一名技术工人当场死亡</div>
            <div class="contentlist">14.UPS公司内鬼组团集体犯罪侵占公司运费980多万元</div>
            <div class="contentlist">15.奔驰车胎漏气监测不报警</div>
            <div class="contentlist">16.CBA-新疆新援能否战JR 连败北京遇强敌</div>
            <div class="contentlist">17.科比30+8湖人负开拓者 詹韦休战热火三加时胜老鹰</div>
            <div class="contentlist">18.英媒惊曝曼联挖角兰帕德 小贝最新内裤广告超酷造型</div>
            <div class="contentlist">19.曼奇尼笑迎孙继海 英主力紧拥</div>
            <div class="contentlist">20.冬运花滑庞清佟健复出夺冠 </div>
            <div class="contentlist">21.中国彩票年销2214亿涨33%</div>
            <div class="contentlist">22.双色球26注530万分落14省市</div>
            <div class="contentlist">23.安全是根本 自主品牌C-NCAP碰撞评说</div>
            <div class="contentlist">24.赏豪车买车尽在车型总汇</div>
            <div class="contentlist">25.蔡澜：风情万种的日本版朱茵</div>
            <div class="contentlist">26.微访谈：黄觉其实是个艺术家</div>
            <div class="contentlist">27.杨澜访邓婕：当家庭主妇难</div>
            <div class="contentlist">28.中学女生迎新“黑丝”上阵</div>
            <div class="contentlist">29.陆空三军都干过的将军</div>
        </div>
        <br/><br/><br/>
        
        <div id="navigatediv">
        
        </div>    
    </body>    
</html>    

.pagenavigate{
        border:1 solid #78cdd1;
        width:20px;
        height:20px;
        line-height:20px;
        text-align:center;
        background-color:#90d7ec;
        float:left;
        margin:0 2px;
}

.pagenext,.pagelast,.pagefirst,.pagepre{
    border:1 solid #78cdd1;
    width:40px;
    height:20px;
    line-height:20px;
    text-align:center;
    float:left;
    margin:0 1px;
}

.pagenavigate a{
        width:20px;
        height:20px;
        color:#fffef9;
        background-color:#90d7ec;
        text-decoration:none;
}


.pagenext a,.pagelast a,.pagefirst a,.pagepre a{
    width:40px;
    height:20px;
    color:#009ad6;
    font-size:12px;
    text-decoration:none;
    
}
#contents{
    height:150px;    
}
.pagenavigateon{
        border:1 solid #78cdd1;
        width:20px;
        height:20px;
        line-height:20px;
        text-align:center;
        color:#ff0000!important;
        background-color:#90d7ec;
}

.pagenavigateon a{
        color:#ff0000;
        text-decoration:none;
}

var menuId = $( "ul.nav" ).first().attr( "id" );
var request = $.ajax({
  url: "script.php",
  type: "POST",
  data: { id : menuId },
  dataType: "html"
});
 
request.done(function( msg ) {
  $( "#log" ).html( msg );
});
 
request.fail(function( jqXHR, textStatus ) {
  alert( "Request failed: " + textStatus );
});