ALTER TABLE dede_archives ADD zan int(11) NOT NULL DEFAULT '0' AFTER weight;

CREATE TABLE IF NOT EXISTS `dede_zan` ( 
  `id` int(11) NOT NULL AUTO_INCREMENT, 
  `aid` int(11) NOT NULL, 
  `ip` varchar(40) NOT NULL, 
  PRIMARY KEY (`id`) 
) ENGINE=MyISAM  DEFAULT CHARSET=utf8

function zan($aid)
{
    global $dsql;
    $row = $dsql->GetOne("Select id,zan From dede_archives where id='".$aid."'");
    return $row['zan'];
    }

.zan p{
background:#000; opacity:.8;filter:alpha(opacity=80);} 
.zan p a{padding-left:30px; height:24px; background:url(/images/heart.png) no-repeat  
4px -1px;color:#fff; font-weight:bold; font-size:14px} 
.zan p a:hover{background-position:4px -25px;text-decoration:none}

<script type="text/javascript" src="/jquery.js"></script>  
$(function(){ 
    $("p a").click(function(){ 
        var zan = $(this); 
        var id = zan.attr("rel"); //對應(yīng)id 
        zan.fadeOut(300); //漸隱效果 
        $.ajax({ 
            type:"POST", 
            url:"/zan.php", 
            data:"id="+id, 
            cache:false, //不緩存此頁面 
            success:function(data){ 
                zan.html(data); 
                zan.fadeIn(300); //漸顯效果 
            } 
        }); 
        return false; 
    }); 
});

<div class="zan"><p><a href="#"  
title="贊一個 "class="img_on" rel="{dede:field.id/}">{dede:field.id function="zan(@me)"/}</a></p></div>

<?php
require_once (dirname(__FILE__) . "/include/common.inc.php");
$ip =getip(); //獲取用戶IP 
$id = $_POST['id']; 
if(!isset($id) || empty($id)) exit; 

//查詢已贊過的IP
$dsql->SetQuery("SELECT ip FROM dede_zan  WHERE aid='".$id."' and ip='$ip'");
$dsql->Execute();
$count = $dsql->GetTotalRow();

if($count==0){ //如果沒有記錄 

    $dsql->ExecuteNoneQuery("update dede_archives set zan=zan+1 where id='$id'; ");//寫入贊數(shù)
     
    $dsql->ExecuteNoneQuery("insert into dede_zan (aid,ip) values ('$id','$ip'); ");//寫入IP,及被贊的AID 

    $rows = $dsql->GetOne("Select zan  from dede_archives where id='".$id."'");//獲取被贊的數(shù)量
    $zan = $rows['zan']; //獲取贊數(shù)值 
    echo $zan; 
}else{ 
    echo "贊過了.."; 
}