$.ajax 分页

<!--zhongtu-->
<div id="ztp">
     <div  id="ztpian">
     </div>
</div>
<!--内容-->
<div id="nr"><div id="xian">

     </div>
</div>
</div>
<center >
                <div id="fyh" style=" 300px; height:50px; font-size:16px; position:relative; margin-left:100px">
                <ul class="pagination" id="fy_list">
                   
                </ul>
                </div>
                <input type="hidden" value="1" id="fy_n" />
                </center>

$(document).ready(function(e){
    
    dengluzt();
    //确定总页数的变量
    var zys = 0;
    //查询数据
    $("#fy_n").val(1);
      $(".lei").click(function(){
        bs = $(this).attr("bs");
        
        JiaZai(bs);
        });
 
});
//加载数据方法
    function JiaZai(bs)
    {
        var n = $("#fy_n").val();
        bs=bs;
        $.ajax({
                url:"ffffffchuli.php",
                data:{bs:bs,n:n, tp:1},
                type:"POST",
                dataType:"JSON",
                success: function(data){
                    var strs = "";
                    for(var k in data)
                    {  
                        
                        strs=strs+"<div ><div style='background-image:url("+data[k].image+"); 314px; height:314px;overflow:hidden;background-position:center; float:left; margin-left:28px; margin-bottom:20px ;border-radius:12px ;'><div id='dise'></div>&nbsp;<div id='kkkk'><a class='heng'  href="guankan.php?bt='"+data[k].code+"'">&nbsp;<span class='glyphicon glyphicon-eye-open'>可观看</span></a><a style='color:#FFF'>|</a><a class='theng' href="guankan.php?bt='"+data[k].code+"'"><span class='glyphicon glyphicon-save'>可下载</span></a></div></div>"
                    }
                    
                        
                    $("#xian").html(strs);}
            });
        //获取分页数(列表)
        $.ajax({
                url:"ffffffchuli.php",
                data:{bs:bs,tp:2},
                type:"POST",
                dataType:"TEXT",
                success: function(data){
                        //总页数
                        var ys = Math.ceil(data/6); 
                        zys = ys;
                        
                        var s ="";
                        //var s = "<li><a id='fy_shang'>&laquo;</a></li>";
                        var dangqian = parseInt($("#fy_n").val()); //当前页数
                        
                                for(var i=dangqian-2;i<=dangqian+2;i++){
                                    if(i>0 && i<=zys)
                                    {
                                        if(dangqian==i)
                                        {
                                        s+="<li  class='active fy_zhong' style='font-size:16px; 20px; height:20px; float:left; text-align:center; vertical-align:middle; line-height:50px; list-style-type:none; margin:10px'><a>"+i+"</a></li>";
                                        }
                                        else
                                        {
                                            s+="<li class='fy_zhong' style='font-size:16px; 20px; height:20px; float:left; text-align:center; vertical-align:middle; line-height:50px; list-style-type:none; margin:10px'><a>"+i+"</a></li>"
                                        }
                                    }
                                }
                            
                        //s += "<li><a id='fy_xia'>&raquo;</a></li>";
                    
                        $("#fy_list").html(s);
                        
                           //给分页列表加事件
                        JiaShiJian();
                    }
                })
    }
    //给分页列表加事件的方法
    function JiaShiJian()
    {
        $("#fy_shang").click(function(){
            
                var n = $("#fy_n").val(); 
                if(n>1)
                {
                    n--;
                }
                else
                {
                    n=1;
                }
                $("#fy_n").val(n);
                
                //加载数据
                JiaZai();
            })
        $("#fy_xia").click(function(){
                var n = $("#fy_n").val(); 
                if(n<zys)
                {
                    n++;
                }
                else
                {
                    n=zys;
                }
                $("#fy_n").val(n);
                
                //加载数据
                JiaZai(bs);
            })
        $(".fy_zhong").click(function(){
                var n = $(this).text();
                $("#fy_n").val(n);
                
                //加载数据
                JiaZai(bs);
            })
    }

<?php
 session_start();
include("dbda.php");
$db = new DBDA();
$tp = $_POST["tp"];

if(!empty($_SESSION["uid"])){
    
    $uid=$_SESSION["uid"];
    }

switch($tp){
    case 1:
        $n = $_POST["n"];
        $tg = ($n-1)*6;
        $bs = $_POST["bs"];
        $sqlsj = "select * from xinxi where class='{$bs}' limit {$tg},6 ";
        
        echo $db->JsonQuery($sqlsj);
        
        break;
    case 2:
        $bs = $_POST["bs"];
        $sql = "select count(*) from xinxi where class='{$bs}'";
        $zs = $db->StrQuery($sql);
        echo $zs;
        break;