php结合ajax实现赞、顶、踩功能实例

<script type="text/javascript" src="https://www.jb51.net/js/jquery.min.js"></script>
<script type="text/javascript" src="finger_ajax.js"></script>
<?php
 header("Content-type:text/html;charset=utf-8");
 include "finger_ajax.php";

 $sql = "select * from finger_ajax";
 $res = mysql_query($sql,$link);
 while($row = mysql_fetch_array($res)){
  echo "<p>".$row['title']." \r\n<a href='#' onclick='finger(".$row['id'].")'><img src='finger.jpg'/>赞一下(<span class='finger".$row['id']."'>".$row['finger']."</span>)</a></p>\r\n";
 }
?>

<?php
 /**"赞" 功能 响应ajax请求*/
 //配置
 $dbHost = "localhost";
 $dbUser = "root";
 $dbPass = "dddddd";
 $dbName = "test";
 $dbCharset = "utf8";

 $link = mysql_connect($dbHost,$dbUser,$dbPass) or die(mysql_error());
 mysql_query("set names ".$dbCharset);
 mysql_select_db($dbName);
 // End

 //接受对应的id
 if(!empty($_POST['id'])){
  $id = $_POST['id'];
  //“赞”加1
  $sql = "update finger_ajax set finger=finger+1 where id=$id;";
  if(mysql_query($sql,$link)){
   echo "ok";
  }else{
   echo "failed";
  }
 }
?>

//赞 js
function finger(topic_id){
 $.post("finger_ajax.php", { "id": topic_id },
   function(data){
     if(data=="ok"){
    alert("感谢您的支持！");
   }else{
    alert("对不起，失败了！");
   }
   }, "text"); 
  //获取当前“赞”的次数并加1
  var finger = parseInt($(".finger"+topic_id).html())+1;
  //更新“赞”的次数
  $(".finger"+topic_id).html(finger);
}

DROP TABLE IF EXISTS `finger_ajax`;
CREATE TABLE `finger_ajax` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(50) NOT NULL DEFAULT '',
  `finger` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of finger_ajax
-- ----------------------------
INSERT INTO `finger_ajax` VALUES ('1', '今天天气还不错哦！去做点什么好呢？', '10');
INSERT INTO `finger_ajax` VALUES ('2', '欢迎来到 www.jb51.net，国庆将至，祝大家国庆节快乐！！', '3');