JS+PHP瀑布流效果

miai.php，代码如下：

$link = mysql_connect("localhost","root","");
//连接数据库

$num = 0 *3;//分页 
if(isset($_POST['num']) && $_POST['num'] != 0)
    $num
+1; 
else
    $num =
0;
$sql = "select id,image from liu.miai limit
".$num.",3";//分条 
$result = mysql_query($sql,$link);

$json_arr = array(); 
while($row =
mysql_fetch_array($result)){

$json_arr[]  =
(object)$row; 
} 
echo json_encode($json_arr);