php+jQuery+Ajax实现点赞效果的方法(附源码下载)

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");
	 $sql = mysqli_query($link,"select * from pic");
	 while($row=mysqli_fetch_array($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="赞" 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");

$ip = get_client_ip();
$id = $_POST['id'];
if(!isset($id) || empty($id)) exit;

$ip_sql=mysqli_query($link,"select ip from pic_ip where pic_id='$id' and ip='$ip'");
$count=mysqli_num_rows($ip_sql);
if($count==0){
	$sql = "update pic set love=love+1 where id='$id'";
	mysqli_query($link,$sql);
	$sql_in = "insert into pic_ip (pic_id,ip) values ('$id','$ip')";
	mysqli_query($link,$sql_in);
	$result = mysqli_query($link,"select love from pic where id='$id'");
	$row = mysqli_fetch_array($result);
	$love = $row['love'];
	echo $love;
}else{
	echo "赞过了..";
}

function Zan( goodsId, a ){
 $.post( "/goods/zan/"+goodsId, null,function( ret ){
   if( ret.status == 'ok' )
   $(a).html( ret.zannum);
   else
   alert( ret.data );
 },'json' );
}