CREATE TABLE IF NOT EXISTS `pic` ( 
 `id` int(11) NOT NULL AUTO_INCREMENT, 
 `pic_name` varchar(60) NOT NULL, 
 `pic_url` varchar(60) NOT NULL, 
 `love` int(11) NOT NULL DEFAULT '0', 
 PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8; 
CREATE TABLE IF NOT EXISTS `pic_ip` ( 
 `id` int(11) NOT NULL AUTO_INCREMENT, 
 `pic_id` int(11) NOT NULL, 
 `ip` varchar(40) NOT NULL, 
 PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8 

<?php 
  include_once("connect.php"); 
  $sql = mysql_query("select * from pic"); 
  while($row=mysql_fetch_array($sql)){ 
   $pic_id = $row['id']; 
   $pic_name = $row['pic_name']; 
   $pic_url = $row['pic_url']; 
   $love = $row['love']; 
  ?> 
  <li><img src="images/<?php echo $pic_url;?>" alt="<?php echo $pic_name;?>"><p><a href="#" 
title="我喜欢"class="img_on" rel="<?php echo $pic_id;?>"><?php echo $love;?></a></p></li> 
 <?php }?> 

.list{width:760px; margin:20px auto} 
.list li{float:left; width:360px; height:280px; margin:10px; position:relative} 
.list li p{position:absolute; top:0; left:0; width:360px; height:24px; line-height:24px; 
background:#000; opacity:.8;filter:alpha(opacity=80);} 
.list li p a{padding-left:30px; height:24px; background:url(images/heart.png) no-repeat 
4px -1px;color:#fff; font-weight:bold; font-size:14px} 
.list li p a:hover{background-position:4px -25px;text-decoration:none} 

$(function(){ 
 $("p a").click(function(){ 
  var love = $(this); 
  var id = love.attr("rel"); //对应id 
  love.fadeOut(300); //渐隐效果 
  $.ajax({ 
   type:"POST", 
   url:"love.php", 
   data:"id="+id, 
   cache:false, //不缓存此页面 
   success:function(data){ 
    love.html(data); 
    love.fadeIn(300); //渐显效果 
   } 
  }); 
  return false; 
 }); 
}); 

include_once("connect.php"); //连接数据库 
$ip = get_client_ip(); //获取用户IP 
$id = $_POST['id']; 
if(!isset($id) || empty($id)) exit; 
$ip_sql=mysql_query("select ip from pic_ip where pic_id='$id' and ip='$ip'"); 
$count=mysql_num_rows($ip_sql); 
if($count==0){ //如果没有记录 
 $sql = "update pic set love=love+1 where id='$id'"; //更新数据 
 mysql_query( $sql); 
 $sql_in = "insert into pic_ip (pic_id,ip) values ('$id','$ip')"; //写入数据 
 mysql_query( $sql_in); 
 $result = mysql_query("select love from pic where id='$id'"); 
 $row = mysql_fetch_array($result); 
 $love = $row['love']; //获取love数值 
 echo $love; 
}else{ 
 echo "喜欢过了.."; 
}