Comment like and dislike function implemented by PHP combined with jQuery_jquery

 
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); 
  } 
} 

 
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); 
}