/*浮動窗口*/(function(){     var n=10;   var obj=document.getElementById("goods-compare");   if(!obj){     return false;   }   var x=0;   window.onscroll=function(){     obj.style.top=(document.body.scrollTop||document.documentElement.scrollTop)+n+'px';   };   window.onresize=function(){     obj.style.top=(document.body.scrollTop||document.documentElement.scrollTop)+n+'px';   };   })();   //添加顯示對比框 function addcompare(chk){   $('#goods-compare').fadeIn().show();   var count=$(".compare-box li").length;   if (count>2)//這里可以修改對比的數據哦   {     alert('產品比較最多選3種哦');     return;   }     $.ajax({     type: 'post',     url: 'ajax.php',     data: {       'action':'1',       'gid':chk.gid,//商品ID       'gname':chk.gname,//商品名稱       'gtype':chk.gtype//商品類別，類別不同時不能比較     },     cache: false,     async: false,     success: function(result) {       if(result!='')       {         alert(result);       }else{         var url='http://www.lusen.com/product-'+chk.gid+'.html';//設置商品的鏈接地址         $(".compare-box").append("<li class='division clearfix' id='"+chk.gid+"'><div class='span-3'><a href='"+url+"' target='_blank' title='"+chk.gname+"'>'"+chk.gname+"'</a></div><span onclick=/"removecompare('"+chk.gid+"');/">刪除</span></li>")         $("#comids").val($(".compare-box li").map(function(){//將對比的所有商品ID，賦值給#comids           return $(this).attr('id');         }).get().join(","));       }     }   }); }   //刪除對比產品 function removecompare(id) {   $.ajax({     type: 'post',     url: 'ajax.php',     data: {       'action':'2',       'gid':id     },     cache: false,     success: function(result) {       $("#"+id).remove();       $("#comids").val($(".compare-box li").map(function(){         return $(this).attr('id');       }).get().join(","));     }   });    } //清空對比產品 function clearcompare() {     $.ajax({     type: 'post',     url: 'ajax.php',     data: {       'action':'3'    },     cache: false,     success: function(result) {       $(".compare-box").html('');       $("#comids").val('');     }   }); } //顯示對比框 function showcompare() {   $.ajax({     type: 'post',     url: 'ajax.php',     data: {       'action':'4'    },     success: function(result) {       if(result){         $(".compare-box").append(result);         $("#comids").val($(".compare-box li").map(function(){           return $(this).attr('id');         }).get().join(","));         $('#goods-compare').fadeIn().show();       }     }   });    }   //點擊關閉對比框 $('.close-gc').click(function(){   $('#goods-compare').fadeOut().hide(); }); 

<?php function mb_unserialize($serial_str) {   $serial_str =stripslashes($serial_str);   return unserialize($serial_str); } if($_POST['action']=='1') {//add   if(isset($_COOKIE['gtype'])) {     if($_COOKIE['gtype']!=$_POST['gtype']) {       echo '對不起，您選擇的是不同類別的產品無法加入對比，請選擇同類產品或清空當前對比欄再選擇。';       return;     }   }else {     setcookie('gtype',$_POST['gtype']);   }   if(isset($_COOKIE['gid'])) {     $arr_str = $_COOKIE['gid'];     $arr=mb_unserialize($arr_str);     if(count($arr)>2) {//商品比較數量       echo "商品比較最多選3種";       return;     }     foreach($arr as $val) {       if($val[0]==$_POST['gid']) {         echo "該商品已經加入對比框";         return;       }     }     $info=array($_POST['gid'],$_POST['gname'],$_POST['gtype']);     $arr[]=$info;     $arr_str=serialize($arr);     setcookie('gid',$arr_str);   }else {     $info=array($_POST['gid'],$_POST['gname'],$_POST['gtype']);     $arr[]=$info;     $arr_str=serialize($arr);     setcookie('gid',$arr_str);   } }else if($_POST['action']=='2') {//delone   $id=$_POST['gid'];   $arr_str = $_COOKIE['gid'];   $arr=mb_unserialize($arr_str);     foreach($arr as $key=>$val) {     if($val[0]==$id) {       unset ($arr[$key]);     }   }   $arr_str=serialize($arr);     setcookie('gid',$arr_str); }else if($_POST['action']=='3') {//delall   setcookie('gid','');   setcookie('gtype',''); }else if($_POST['action']=='4') {//showlist   if(isset($_COOKIE['gid'])) {     $data='';     $arr_str = $_COOKIE['gid'];     $arr=mb_unserialize($arr_str);      foreach ($arr as $val){            $url="http://www.lusen.com/product-".$val[0].".html";       $data.="<li id='{$val[0]}' class='division clearfix'><div class='span-3'><a href='{$url}' target='_blank' title='{$val[1]}'>{$val[1]}</a></div><span onclick=/"removecompare('{$val[0]}');/">刪除</span></li>";     }     echo $data;   }   } ?>