Dede利用ajax无限加载文章

if(isset($_GET['ajax'])){
$typeid = isset($_GET['typeid']) ? intval($_GET['typeid']): 0;//传递过来的分类ID
$page = isset($_GET['page']) ? intval($_GET['page']): 0;//页码
$pagesize = isset($_GET['pagesize']) ? intval($_GET['pagesize']): 15;//每页多少条，也就是一次加载多少条数据
$start = $page>0 ? ($page-1)*$pagesize : 0;//数据获取的起始位置。即limit条件的第一个参数。
$typesql = $typeid ? " WHERE typeid=$typeid" : '';//这个是用于首页实现瀑布流加载，因为首页加载数据是无需分类的，所以要加以判断，如果无需
$total_sql = "SELECT COUNT(id) as num FROM `tufei_archives`  $typesql ";
$temp = $dsql->GetOne($total_sql);
$total = 0;//数据总数
$load_num =0;
if(is_array($temp)){
$load_num= round(($temp['num']-15)/$pagesize);//要加载的次数,因为默认已经加载了
$total = $temp['num'];
}
$sql = "SELECT a.*,t.typedir,t.typename,t.isdefault,t.defaultname,t.namerule,
t.namerule2,t.ispart, t.moresite,t.siteurl,t.sitepath
FROM `tufei_archives` as a JOIN `tufei_arctype` AS t ON a.typeid=t.id    $typesql ORDER BY id DESC LIMIT $start,$pagesize";
//echo "$sql";
$dsql->SetQuery($sql);
$dsql->Execute('list');
$statu = 0;//是否有数据，默认没有数据
$data = array();
$index = 0;
while($row = $dsql->GetArray("list")){
$row['info'] = $row['info'] = $row['infos'] = cn_substr($row['description'],160);
$row['id'] =  $row['id'];
$row['filename'] = $row['arcurl'] = GetFileUrl($row['id'],
$row['typeid'],$row['senddate'],$row['title'],$row['ismake'],
$row['arcrank'],$row['namerule'],$row['typedir'],$row['money'],
$row['filename'],$row['moresite'],$row['siteurl'],$row['sitepath']);
$row['typeurl'] = GetTypeUrl($row['typeid'],$row['typedir'],
$row['isdefault'],$row['defaultname'],$row['ispart'],
$row['namerule2'],$row['moresite'],$row['siteurl'],$row['sitepath']);
if($row['litpic'] == '-' || $row['litpic'] == ''){
$row['litpic'] = $GLOBALS['cfg_cmspath'].'/images/defaultpic.gif';
}
if(!preg_match("#^http:\/\/#i", $row['litpic']) &&$GLOBALS['cfg_multi_site'] == 'Y'){
$row['litpic'] = $GLOBALS['cfg_mainsite'].$row['litpic'];
}
$row['picname'] = $row['litpic'];//缩略图
$row['stime'] = GetDateMK($row['pubdate']);
$row['typelink'] = "<a href='".$row['typeurl']."'>".$row['typename']."</a>";//分类链
$row['fulltitle'] = $row['title'];//完整的标题
$row['shorttitle'] = $row['shorttitle'];//副标题
$row['title'] = cn_substr($row['title'], 60);//截取后的标题
$data[$index] = $row;
$index++;
}
if(!empty($data)){
$statu = 1;//有数据
}
$result =array('statu'=>$statu,'list'=>$data,'total'=>$total,'load_num'=>$load_num);
echo json_encode($result);//返回数据
exit();
}