PHP+jQuery+MySql implements red and blue voting examples

<p class="vote"> 
 <p class="votetitle">您对PHP中文网提供的文章的看法？</p> 
 <p class="votetxt">非常实用<span>完全看不懂</span></p> 
 <p class="red" id="red"> 
 <p class="redhand"></p> 
 <p class="redbar" id="red_bar"> 
  <span></span> 
  <p id="red_num"></p> 
 </p> 
 </p> 
 <p class="blue" id="blue"> 
 <p class="bluehand"></p> 
 <p class="bluebar" id="blue_bar"> 
  <span></span> 
  <p id="blue_num"></p> 
 </p> 
 </p> 
</p>

.vote{width:288px; height:220px; margin:60px auto 20px auto;position:relative} 
.votetitle{width:100%;height:62px; background:url(icon.png) no-repeat 0 30px; font-size:15px} 
.red{position:absolute; left:0; top:90px; height:80px;} 
.blue{position:absolute; right:0; top:90px; height:80px;} 
.votetxt{line-height:24px} 
.votetxt span{float:right} 
.redhand{position:absolute; left:0;width:36px; height:36px; background:url(icon.png) no-repeat -1px -38px;cursor:pointer} 
.bluehand{position:absolute; right:0;width:36px; height:36px; background:url(icon.png) no-repeat -41px -38px;cursor:pointer} 
.grayhand{width:34px; height:34px; background:url(icon.png) no-repeat -83px -38px;cursor:pointer} 
.redbar{position:absolute; left:42px; margin-top:8px;} 
.bluebar{position:absolute; right:42px; margin-top:8px; } 
.redbar span{display:block; height:6px; background:red; width:100%;border-radius:4px;} 
.bluebar span{display:block; height:6px; background:#09f; width:100%;border-radius:4px; position:absolute; right:0} 
.redbar p{line-height:20px; color:red;} 
.bluebar p{line-height:20px; color:#09f; text-align:right; margin-top:6px}

function getdata(url,sid){ 
 $.getJSON(url,{id:sid},function(data){ 
 if(data.success==1){ 
  var w = 208; //定义比例条的总宽度 
  //红方投票数 
  $("#red_num").html(data.red); 
  $("#red").css("width",data.red_percent*100+"%"); 
  var red_bar_w = w*data.red_percent-10; 
  //红方比例条宽度 
  $("#red_bar").css("width",red_bar_w); 
  //蓝方投票数 
  $("#blue_num").html(data.blue); 
  $("#blue").css("width",data.blue_percent*100+"%"); 
  var blue_bar_w = w*data.blue_percent; 
  //蓝方比例条宽度 
  $("#blue_bar").css("width",blue_bar_w); 
 }else{ 
  alert(data.msg); 
 } 
 }); 
}

 $(function(){ 
 //获取初始数据 
 getdata("vote.php",1); 
 //红方投票 
 $(".redhand").click(function(){ 
 getdata("vote.php?action=red",1); 
 }); 
 //蓝方投票 
 $(".bluehand").click(function(){ 
 getdata("vote.php?action=blue",1); 
 }); 
});

include_once("connect.php"); 

$action = $_GET['action']; 
$id = intval($_GET['id']); 
$ip = get_client_ip();//获取ip 

if($action=='red'){//红方投票 
vote(1,$id,$ip); 
}elseif($action=='blue'){//蓝方投票 
vote(0,$id,$ip); 
}else{//默认返回初始数据 
echo jsons($id); 
}

function vote($type,$id,$ip){ 
 $ip_sql=mysql_query("select ip from votes_ip where vid='$id' and ip='$ip'"); 
 $count=mysql_num_rows($ip_sql); 
 if($count==0){//还没有投票 
 if($type==1){//红方 
  $sql = "update votes set likes=likes+1 where id=".$id; 
 }else{//蓝方 
  $sql = "update votes set unlikes=unlikes+1 where id=".$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{ 
 $arr['success'] = 0; 
 $arr['msg'] = '已经投票过了'; 
 echo json_encode($arr); 
 } 
}

function jsons($id){ 
 $query = mysql_query("select * from votes where id=".$id); 
 $row = mysql_fetch_array($query); 
 $red = $row['likes']; 
 $blue = $row['unlikes']; 
 $arr['success']=1; 
 $arr['red'] = $red; 
 $arr['blue'] = $blue; 
 $red_percent = round($red/($red+$blue),3); 
 $arr['red_percent'] = $red_percent; 
 $arr['blue_percent'] = 1-$red_percent; 
 
 return json_encode($arr); 
}

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;

<p class="digg"> 
 <p id="dig_up" class="digup"> 
 <span id="num_up"></span> 
 <p>很好，很强大！</p> 
 <p id="bar_up" class="bar"><span></span><i></i></p> 
 </p> 
 <p id="dig_down" class="digdown"> 
 <span id="num_down"></span> 
 <p>太差劲了！</p> 
 <p id="bar_down" class="bar"><span></span><i></i></p> 
 </p> 
 <p id="msg"></p> 
</p>
$(function(){ 
 //当鼠标悬浮和离开两个按钮时，切换按钮背景样式 
 $("#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("ajax.php",1); 
 //单击“顶”时 
 $("#dig_up").click(function(){ 
 getdata("ajax.php?action=like",1); 
 }); 
 //单击“踩”时 
 $("#dig_down").click(function(){ 
 getdata("ajax.php?action=unlike",1); 
 }); 
});