JS实现分页效果

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery伪分页效果</title>
<script src="http://campus.alibaba.com/assets/lib/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(document).ready(function(){
            $("ul li:gt(3)").hide();//初始化,前面4条数据显示,其他的数据隐藏。
            var total_q=$("ul li").index()+1;//总数据
            var current_page=4;//每页显示的数据
            var current_num=1;//当前页数
            var total_page= Math.round(total_q/current_page);//总页数
            var next=$(".next");//下一页
            var prev=$(".prev");//上一页
            $(".total").text(total_page);//显示总页数
            $(".current_page").text(current_num);//当前的页数
                                          
            //下一页
            $(".next").click(function(){
                if(current_num==7){
                        return false;//如果大于总页数就禁用下一页
                    }
                    else{
                        $(".current_page").text(++current_num);//点击下一页的时候当前页数的值就加1
                        $.each($(‘ul li‘),function(index,item){
                            var start = current_page* (current_num-1);//起始范围
                            var end = current_page * current_num;//结束范围
                            if(index >= start && index < end){//如果索引值是在start和end之间的元素就显示,否则就隐
                                $(this).show();
                            }else {
                                $(this).hide();
                            }
                        });
                    }
            });
            //上一页方法
            $(".prev").click(function(){
                    if(current_num==1){
                        return false;
                    }else{
                        $(".current_page").text(--current_num);
                        $.each($(‘ul li‘),function(index,item){
                            var start = current_page* (current_num-1);//起始范围
                            var end = current_page * current_num;//结束范围
                            if(index >= start && index < end){//如果索引值是在start和end之间的元素就显示,否则就隐藏
                                $(this).show();
                            }else {
                                $(this).hide();
                            }
                        });    
                    }
                                                  
                })
    })
</script>
<style type="text/css">
    .main{width:800px;zoom:1;margin:0 auto;}
    .item{width:800px;overflow:hidden;}
    ul{padding:0;width:860px;zoom:1;}
    .clear{zoom:1;}
    .clear:after{content:"";display:block;height:0;clear:both;visibility:hidden;}
    ul li{list-style-type:none;float:left;background:#F69;font-size:60px;text-shadow:1px 1px 3px #555;width:380px;height:200px;margin:10px 40px 10px 0;line-height:200px;text-align:center;color:#fff;}
    .page_btn{padding-top:20px;}
    .page_btn a{cursor:pointer;padding:5px;border:solid 1px #ccc;font-size:12px;}
    .page_box{float:right;}
    .num{padding:0 10px;}
</style>
</head>
                              
<body>
    <div class="main">
        <div class="item">
            <ul class="clear">
                <li>1</li>
                <li>2</li>
                <li>3</li>
                <li>4</li>
                <li>5</li>
                <li>6</li>
                <li>7</li>
                <li>8</li>
                <li>9</li>
                <li>10</li>
                <li>11</li>
                <li>12</li>
                <li>13</li>
                <li>14</li>
                <li>15</li>
                <li>16</li>
                <li>17</li>
                <li>18</li>
                <li>19</li>
                <li>20</li>
                <li>21</li>
                <li>22</li>
                <li>23</li>
                <li>24</li>
                <li>25</li>
                <li>26</li>
                <li>27</li>
                <li>28</li>
            </ul>
        </div>
        <div class="page_btn clear">
            <span class="page_box">
                <a class="prev">上一页</a><span class="num"><span class="current_page">1</span><span style="padding:0 3px;">/</span><span class="total"></span></span><a class="next">下一页</a>
            </span>
        </div>
    </div><!--main-->
</body>
</html>

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