php+jQuery+Ajax实现点赞效果的方法(附源码下载)

PHP实战
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实战
<?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="赞"class="img_on" rel="<?php echo $pic_id;?>"><?php echo $love;?></a></p></li>
<?php }?>

PHP实战
.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}

PHP实战
$(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;
  });
});

PHP实战
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']; //获取赞数值
  echo $love;
}else{
  echo "赞过了..";
}

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