javascript实现json页面分页

下午有个朋友问json 数据怎么分页就捣鼓了一个东东出来
下面直接代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
var a={"code":1,"list":[{"category1_id":"1","category1_name":"u9152u6c34u996eu6599","category1_intro":"u6e05u51c9u53efu53e3u7684u9152u6c34u996eu6599","category1_images":"http://www.songcuomen.com/attachments/productType/2014-01/10/21_1389343628.jpg"},{"category1_id":"2","category1_name":"u7c73u9762u7caeu6cb9","category1_intro":"u5bb6u5eadu5fc5u5907","category1_images":"http://www.songcuomen.com/attachments/productType/2014-01/10/21_1389343865.jpg"},{"category1_id":"3","category1_name":"u7f8eu5bb9u6d17u62a4","category1_intro":"u62a4u80a4u5fc5u5907","category1_images":"http://www.songcuomen.com/attachments/productType/2014-01/10/21_1389343935.jpg"},{"category1_id":"4","category1_name":"u6e05u6d01u6d17u6da4","category1_intro":"u7ed9u60a8u4e00u4e2au5e72u51c0u7684u751fu6d3bu73afu5883","category1_images":"http://www.songcuomen.com/attachments/productType/2014-01/10/21_1389343986.jpg"},{"category1_id":"5","category1_name":"u751fu6d3bu7528u54c1","category1_intro":"u5bb6u5eadu5fc5u5907","category1_images":"http://www.songcuomen.com/attachments/productType/2014-01/10/21_1389344445.jpg"},{"category1_id":"6","category1_name":"u4f11u95f2u98dfu54c1","category1_intro":"u597du5403u7f8eu5473","category1_images":"http://www.songcuomen.com/attachments/productType/2014-01/10/21_1389344494.jpg"}]};
var y=1;//表示页数
var t=2;//表示每页现实几条数据
var z=a["list"].length;
var zy= Math.ceil(z/t);
window.onload=function (){
fanye(0);
}
function fanye(f)
{
    if(y==1 && f==-1)
    {
        alert('已经是第一页了');
        f=0;
        }
    if(y==zy && f==1)
    {
        alert('已经是最后一页了');
        f=0;
        }    
    
     var otbod=document.getElementById('table').tBodies[0];
     var s=otbod.rows.length;
    for(i=0;i<s;i++)
    {
    
        otbod.removeChild(otbod.rows[0]);
    }
        y+=f;
       var q=(y-1)*2;//页数-1 乘以每页现实多少条 结果为 本页从第几条开始
       for(var i=1;i<3;i++)
    {
        
    var otr=document.createElement('tr');
    var otd1=document.createElement('td');
    var otd2=document.createElement('td');
    var otd3=document.createElement('td');
    var otd4=document.createElement('td');
    otd1.innerHTML=a["list"][q]['category1_id'];
    otd2.innerHTML=a["list"][q]['category1_name'];
    otd3.innerHTML=a["list"][q]['category1_intro'];
    otd4.innerHTML=a["list"][q]['category1_images'];
    otr.appendChild(otd1);
    otr.appendChild(otd2);
    otr.appendChild(otd3);
    otr.appendChild(otd4);
     otbod.appendChild(otr);
     if(q==zy)
     {
         break;
         }
    q++;
    }
}
</script>

</head>

<body>

<table  border="1" id="table">
<thead>
<tr><td>category1_id</td><td>category1_name</td><td>category1_intro</td><td>category1_images</td></tr>
</thead>
<tbody>

</tbody>
</table>
<a href="javascript:fanye(1);">下一页</a>
<a href="javascript:fanye(-1);">上一页</a>
</body>
</html>
javascript实现json页面分页

大家如果有什么建议可以提出来！！谢谢！！
