php+ajax实现商品对比功能示例

/*浮动窗口*/
(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';
 };
})();
//添加显示对比框
function addcompare(chk){
 $('#goods-compare').fadeIn().show();
 var count=$(".compare-box li").length;
 if (count>2)//这里可以修改对比的数据哦
 {
  alert('产品比较最多选3种哦');
  return;
 }
 $.ajax({
  type: 'post',
  url: 'ajax.php',
  data: {
   'action':'1',
   'gid':chk.gid,//商品ID
   'gname':chk.gname,//商品名称
   'gtype':chk.gtype//商品类别，类别不同时不能比较
  },
  cache: false,
  async: false,
  success: function(result) {
   if(result!='')
   {
    alert(result);
   }else{
    var url='http://www.lusen.com/product-'+chk.gid+'.html';//设置商品的链接地址
    $(".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+"');\">删除</span></li>")
    $("#comids").val($(".compare-box li").map(function(){//将对比的所有商品ID，赋值给#comids
     return $(this).attr('id');
    }).get().join(","));
   }
  }
 });
}
//删除对比产品
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(","));
  }
 });
}
//清空对比产品
function clearcompare()
{
 $.ajax({
  type: 'post',
  url: 'ajax.php',
  data: {
   'action':'3'
  },
  cache: false,
  success: function(result) {
   $(".compare-box").html('');
   $("#comids").val('');
  }
 });
}
//显示对比框
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();
   }
  }
 });
}
//点击关闭对比框
$('.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']!=$_POST['gtype']) {
   echo '对不起，您选择的是不同类别的产品无法加入对比，请选择同类产品或清空当前对比栏再选择。';
   return;
  }
 }else {
  setcookie('gtype',$_POST['gtype']);
 }
 if(isset($_COOKIE['gid'])) {
  $arr_str = $_COOKIE['gid'];
  $arr=mb_unserialize($arr_str);
  if(count($arr)>2) {//商品比较数量
   echo "商品比较最多选3种";
   return;
  }
  foreach($arr as $val) {
   if($val[0]==$_POST['gid']) {
    echo "该商品已经加入对比框";
    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]}');\">删除</span></li>";
  }
  echo $data;
 }
}
?>