페이징 표시 데이터 예제의 jQuery Ajax PHP Mysql 구현 explain_jquery

<div id="list"> 
 <ul></ul> 
</div> 
<div id="pagecount"></div> 

#list{width:680px; height:530px; margin:2px auto; position:relative} 
#list ul li{float:left;width:220px; height:260px; margin:2px} 
#list ul li img{width:220px; height:220px} 
#list ul li p{line-height:22px} 
#pagecount{width:500px; margin:10px auto; text-align:center} 
#pagecount span{margin:4px; font-size:14px} 
#list ul li#loading{width:120px; height:32px; border:1px solid #d3d3d3; 
position:absolute; top:35%; left:42%; text-align:center; background:#f7f7f7 
url(loading.gif) no-repeat 8px 8px;-moz-box-shadow:1px 1px 2px rgba(0,0,0,.2); 
-webkit-box-shadow:1px 1px 2px rgba(0,0,0,.2); box-shadow:1px 1px 2px rgba(0,0,0,.2);} 
jQuery

var curPage = 1; //当前页码 
var total,pageSize,totalPage; //总记录数，每页显示数，总页数 

//获取数据 
function getData(page){ 
 $.ajax({ 
  type: 'POST', 
  url: 'pages.php', 
  data: {'pageNum':page-1}, 
  dataType:'json', 
  beforeSend:function(){ 
   $("#list ul").append("<li id='loading'>loading...</li>");//显示加载动画 
  }, 
  success:function(json){ 
   $("#list ul").empty();//清空数据区 
   total = json.total; //总记录数 
   pageSize = json.pageSize; //每页显示条数 
   curPage = page; //当前页 
   totalPage = json.totalPage; //总页数 
   var li = ""; 
   var list = json.list; 
   $.each(list,function(index,array){ //遍历json数据列 
    li += "<li><a href='#'><img src='"+array['pic']+"'>"+array['title'] 
    +"</a></li>"; 
   }); 
   $("#list ul").append(li); 
  }, 
  complete:function(){ //生成分页条 
   getPageBar(); 
  }, 
  error:function(){ 
   alert("数据加载失败"); 
  } 
 }); 
} 

//获取分页条 
function getPageBar(){ 
 //页码大于最大页数 
 if(curPage>totalPage) curPage=totalPage; 
 //页码小于1 
 if(curPage<1) curPage=1; 
 pageStr = "<span>共"+total+"条</span><span>"+curPage 
 +"/"+totalPage+"</span>"; 
  
 //如果是第一页 
 if(curPage==1){ 
  pageStr += "<span>首页</span><span>上一页</span>"; 
 }else{ 
  pageStr += "<span><a href='javascript:void(0)' rel='1'>首页</a></span> 
  <span><a href='javascript:void(0)' rel='"+(curPage-1)+"'>上一页</a></span>"; 
 } 
  
 //如果是最后页 
 if(curPage>=totalPage){ 
  pageStr += "<span>下一页</span><span>尾页</span>"; 
 }else{ 
  pageStr += "<span><a href='javascript:void(0)' rel='"+(parseInt(curPage)+1)+"'> 
  下一页</a></span><span><a href='javascript:void(0)' rel='"+totalPage+"'>尾页</a> 
  </span>"; 
 } 
   
 $("#pagecount").html(pageStr); 
} 

$(function(){ 
 getData(1); 
 $("#pagecount span a").live('click',function(){ 
  var rel = $(this).attr("rel"); 
  if(rel){ 
   getData(rel); 
  } 
 }); 
}); 

include_once('connect.php'); //连接数据库，略过，具体请下载源码查看 
 
$page = intval($_POST['pageNum']); //当前页 
 
$result = mysql_query("select id from food"); 
$total = mysql_num_rows($result);//总记录数 
$pageSize = 6; //每页显示数 
$totalPage = ceil($total/$pageSize); //总页数 
 
$startPage = $page*$pageSize; //开始记录 
//构造数组 
$arr['total'] = $total; 
$arr['pageSize'] = $pageSize; 
$arr['totalPage'] = $totalPage; 
$query = mysql_query("select id,title,pic from food order by id asc limit 
$startPage,$pageSize"); //查询分页数据 
while($row=mysql_fetch_array($query)){ 
  $arr['list'][] = array( 
   'id' => $row['id'], 
  'title' => $row['title'], 
  'pic' => $row['pic'], 
  ); 
} 
echo json_encode($arr); //输出JSON数据 

CREATE TABLE IF NOT EXISTS `food` ( 
 `id` int(11) NOT NULL AUTO_INCREMENT, 
 `title` varchar(100) NOT NULL, 
 `pic` varchar(255) NOT NULL, 
 PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8;