利用jQuery实现一个简单的表格上下翻页效果

<div class="popup day02-popup04"> 
 <div class="group-caption"> 
  <span>日期</span><span>参与团购场次</span><span class="result">团购结果</span><span>当前状态</span> 
 </div> 
 <table class="group-buying-table J_group_buying_table"> 
  <tr><td>02.08</td><td>第一场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.09</td><td>第二场</td><td>失败</td><td>G币已退回</td></tr> 
  <tr><td>02.10</td><td>第三场</td><td>团购中</td><td>团购中</td></tr> 
  <tr><td>02.11</td><td>第一场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.12</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.13</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.14</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.15</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.16</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.17</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.18</td><td>第二场</td><td>成功</td><td>G币已退回</td></tr> 
  <tr><td>02.19</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.20</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.21</td><td>第二场</td><td>成功</td><td>团购中</td></tr> 
  <tr><td>02.22</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.23</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
  <tr><td>02.24</td><td>第二场</td><td>成功</td><td>G币已退回</td></tr> 
  <tr><td>02.25</td><td>第二场</td><td>成功</td><td>现金券已发放</td></tr> 
 </table> 
 <p class="popup-page-btn"> 
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="prev">上一页</a> 
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="next">下一页</a> 
 </p> 
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="popup-close J_close"></a> 
</div> 

.day02-popup04 { 
 width: 708px; 
 height: 404px; } 
 .day02-popup04 .group-caption { 
 width: 594px; 
 margin: 30px auto 0; 
 border-top: 1px solid #ccc; 
 border-left: 1px solid #ccc; 
 border-bottom: 1px solid #ccc; } 
 .day02-popup04 .group-caption span { 
  width: 147.5px; 
  display: inline-block; 
  border-right: 1px solid #ccc; 
  text-align: center; 
  height: 50px; 
  line-height: 50px; 
  font-weight: 600; 
  font-size: 20px; } 
 .day02-popup04 .group-buying-table { 
 position: relative; 
 width: 594px; 
 margin: 0 auto; 
 height: 255px; 
 overflow: hidden; 
 border-collapse: collapse; } 
 .day02-popup04 .group-buying-table tbody { 
  position: absolute; 
  top: 0; } 
  .day02-popup04 .group-buying-table tbody tr { 
  height: 50px; 
  line-height: 50px; } 
  .day02-popup04 .group-buying-table tbody tr td { 
   width: 147px; 
   border-left: 1px solid #ccc; 
   border-right: 1px solid #ccc; 
   border-bottom: 1px solid #ccc; 
   text-align: center; 
   font-size: 18px; 
   color: #666; } 
 .day02-popup04 .popup-page-btn { 
 position: absolute; 
 width: 100%; 
 bottom: 0; 
 height: 66px; 
 line-height: 66px;} 
 .day02-popup04 .popup-page-btn a { 
  display: inline-block; 
  text-align: center; 
  width: 142px; 
  margin: 0 12px; 
  height: 42px; 
  line-height: 42px; 
  font-size: 20px; 
  color: #fff; 
  background-color: #bf3737; } 

var i= 5, //每页显示的行数 
     len=$groupTable.find('tbody tr').length,//总行数 
     page= 1,        //起始页 
     maxPage=Math.ceil(len/i),    //总页数 
     $tbody=$groupTable.find('tbody'),  //容器 
     $scrollHeight=$groupTable.height();  //滚动距离 
    //下翻按钮 
    $(".next").click(function(e){ 
     if(!$tbody.is(":animated")){ 
      if(page == maxPage ){ 
       $tbody.stop(); 
      }else{ 
       $tbody.animate({top : "-=" + $scrollHeight +"px"},800); 
       page++; 
      } 
     } 
    }); 
    //上翻按钮 
    $(".prev").click(function(){ 
     if(!$tbody.is(":animated")){ 
      if(page == 1){ 
       $tbody.stop(); 
      }else{ 
       $tbody.animate({top : "+=" + $scrollHeight +"px"},800); 
       page--; 
      } 
     } 
    });