PHP+MySql+jQuery实现的＂顶＂和＂踩＂投票功能

CREATE TABLE IF NOT EXISTS `votes` (  `id` int(10) NOT NULL AUTO_INCREMENT,  `likes` int(10) NOT NULL DEFAULT '0',  `unlikes` int(10) NOT NULL DEFAULT '0',  PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;   INSERT INTO `votes` (`id`, `likes`, `unlikes`) VALUES (1, 30, 10);  CREATE TABLE IF NOT EXISTS `votes_ip` (  `id` int(10) NOT NULL,  `vid` int(10) NOT NULL,  `ip` varchar(40) NOT NULL ) ENGINE=MyISAM DEFAULT CHARSET=utf8; 

<div class="digg">  <div id="dig_up" class="digup">  <span id="num_up"></span>  <p>很好，很强大！</p>  <div id="bar_up" class="bar"><span></span><i></i></div>  </div>  <div id="dig_down" class="digdown">  <span id="num_down"></span>  <p>太差劲了！</p>  <div id="bar_down" class="bar"><span></span><i></i></div>  </div>  <div id="msg"></div> </div> 

.digg{width:420px; height:120px; margin:80px auto 20px auto; position:relative} #dig_up,#dig_down{width:200px; height:48px; margin:10px; position:relative; border:1px solid #d3d3d3; padding-left:42px; cursor:pointer} .digup{background:url(diggs.png) no-repeat 4px 2px;} .digup_on{background:url(diggs.png) no-repeat 4px -49px;} .digdown{background:url(diggs.png) no-repeat 4px -102px;} .digdown_on{background:url(diggs.png) no-repeat 4px -154px;} #num_up,#num_down{position:absolute; right:6px; top:18px; font-size:20px;} #dig_up p{height:24px; line-height:24px; color:#360} #dig_down p{height:24px; line-height:24px; color:#f30} .bar{width:100px; height:12px; line-height:12px; border:1px solid #f0f0f0; position:relative; text-align:center} .bar span{display:block; height:12px; } .bar i{position:absolute; top:0; left:104px;} #bar_up span{background:#360} #bar_down span{background:#f60} #msg{position:absolute; right:20px; top:40px; font-size:18px; color:#f00} 

$(function(){  //鼠标滑向和离开投票按钮时，变换背景样式  $("#dig_up").hover(function(){  $(this).addClass("digup_on");  },function(){  $(this).removeClass("digup_on");  });  $("#dig_down").hover(function(){  $(this).addClass("digdown_on");  },function(){  $(this).removeClass("digdown_on");  });   //初始化数据  getdata("do.php",1);   //单击“顶”时  $("#dig_up").click(function(){  getdata("do.php?action=like",1);  });  //单击“踩”时  $("#dig_down").click(function(){  getdata("do.php?action=unlike",1);  }); });    ---------------------------------------function getdata(url,sid){  $.getJSON(url,{id:sid},function(data){  if(data.success==1){//投票成功   $("#num_up").html(data.like);   //通过控制宽度来显示百分比进度条效果   $("#bar_up span").css("width",data.like_percent);   $("#bar_up i").html(data.like_percent);   $("#num_down").html(data.unlike);   $("#bar_down span").css("width",data.unlike_percent);   $("#bar_down i").html(data.unlike_percent);  }else{//投票失败   $("#msg").html(data.msg).show().css({'opacity':1,'top':'40px'})   .animate({top:'-50px',opacity:0}, "slow");  }  }); } 

include_once("connect.php");//连接数据库  $action = $_GET['action']; $id = 1; $ip = get_client_ip();//获取ip  if($action=='like'){//顶  likes(1,$id,$ip); }elseif($action=='unlike'){//踩  likes(0,$id,$ip); }else{  echo jsons($id); }  ------------------------------------function likes($type,$id,$ip){  $ip_sql=mysql_query("select ip from votes_ip where vid='$id' and ip='$ip'");  $count=mysql_num_rows($ip_sql);  if($count==0){//还没有顶过  if($type==1){//顶   $sql = "update votes set likes=likes+1 where id=".$id;  }else{//踩   $sql = "update votes set unlikes=unlikes+1 where id=".$id;  }  mysql_query($sql);    $sql_in = "insert into votes_ip (vid,ip) values ('$id','$ip')";  mysql_query($sql_in);    if(mysql_insert_id()>0){   echo jsons($id);  }else{   $arr['success'] = 0;   $arr['msg'] = '操作失败，请重试';   echo json_encode($arr);  }  }else{  $msg = $type==1?'您已经顶过了':'您已经踩过了';  $arr['success'] = 0;  $arr['msg'] = $msg;  echo json_encode($arr);  } }   -----------php-------------------------  function jsons($id){  $query = mysql_query("select * from votes where id=".$id);  $row = mysql_fetch_array($query);  $like = $row['likes'];  $unlike = $row['unlikes'];  $arr['success']=1;  $arr['like'] = $like;  $arr['unlike'] = $unlike;  $like_percent = round($like/($like+$unlike),3)*100;  $arr['like_percent'] = $like_percent.'%';  $arr['unlike_percent'] = (100-$like_percent).'%';   return json_encode($arr); }