写个js 分页玩玩（原创）

<ul id="page">
    <li class="pagetest">1</li>
    <li class="pagetest">2</li>
    <li class="pagetest">3</li>
    <li class="pagetest">4</li>
    <li class="pagetest">5</li>
    <li class="pagetest">6</li>
    <li class="pagetest">7</li>
    <li class="pagetest">8</li>
    <li class="pagetest">9</li>
    <li class="pagetest">10</li>
    <li class="pagetest">11</li>
    <li class="pagetest">12</li>
</ul>
<div id="pageDom"></div>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<div class="dibu">
    <script>
    var pageInfo={PageSize:null,TotalItemCount:null,PageNumber:null,PageCount:null,HasPreviousPage:null,HasNextPage:null,frontPageSize:5,backPageSize:4,pageListDomID:null,pageNumberDomID:null};
    pageInfo.pageListDomID="page";
    pageInfo.pageNumberDomID="pageDom";
    pageInfo.PageSize=2;
 
    GetPageInfo(2);    
 
    function GetPageInfo(pageNumber)
    {
        $("#"+pageInfo.pageListDomID).children().hide().slice((pageNumber-1)*pageInfo.PageSize,pageNumber*pageInfo.PageSize).show();        
 
        pageInfo.TotalItemCount=$("#"+pageInfo.pageListDomID).children().length;
        pageInfo.PageNumber=pageNumber;
        pageInfo.PageCount=Math.ceil(pageInfo.TotalItemCount/pageInfo.PageSize);
        if(pageInfo.PageNumber>1)
        {
            pageInfo.HasPreviousPage=true;
        }else
        {
            pageInfo.HasPreviousPage=false;
        }
        if(pageInfo.PageNumber<pageInfo.PageCount)
        {
            pageInfo.HasNextPage=true;
        }else
        {
            pageInfo.HasNextPage=false;
        }
 
        updatePage(pageInfo.pageNumberDomID);
    }
 
    function updatePage(id)
    {
        $("#"+id).empty();
        if (pageInfo.HasPreviousPage)
        {
            $("#"+id).append('<span class="hag"><a href="javascript:GetPageInfo(pageInfo.PageNumber - 1);">上一页</a></span>');
        }
        for (var i = pageInfo.PageNumber - pageInfo.frontPageSize; i <= pageInfo.PageNumber + pageInfo.backPageSize; i++)
        {
            if (i >= 1 && i <= pageInfo.PageCount)
            {
                if (pageInfo.PageNumber == i)
                {
                    $("#"+id).append('<span class="hag"><a class="on">'+i+'</a></span>');
                }
                else
                {
                    $("#"+id).append('<span class="hag"><a href="javascript:GetPageInfo('+i+');">'+i+'</a></span>');
                }
            }
        }
        if (pageInfo.HasNextPage)
        {
            $("#"+id).append('<span class="hag"><a href="javascript:GetPageInfo(pageInfo.PageNumber +1);">下一页</a></span>');
        }
    }
    </script>
</div>