/**

 * 分页

 * @author chenqionghe

 * @param data  json数据，包含totalPage,count

 * @param page  获取的页数

 * @param obj   表格中的对象

 * @param funcName  页码点击跳转的函数名,默认为showPage

 * @constructor

 */

function Page(data,page,obj,funcName)

{

    var funcName = arguments[3] ? arguments[3] : 'showPage';

    this.totalPage = data.totalPage;    //总页数

    this.count = data.count;            //总记录数

    this.per = data.per;                //每页显示多少条

    this.nowPage = page;                //当前页码

    this.per_choose = [5,10,20,50,100];   //每页提供选择显示条数

    this.pageStr = function ()

    {

        if(this.count == 0)

        {

            return '<tr><td  class="pageStr" colspan="'+$(obj).closest('table').find('th').length+'"><span class="rows">没有数据可供显示</span></td></tr>';

        }

        //根据总的记录数,循环构造翻页字符串

        var rollPage = 5;//设置每页显示的提供点击的页数

        var offset = Math.ceil((rollPage / 2));

        var pageStr = '<tr><td  class="pageStr" colspan="'+$(obj).closest('table').find('th').length+'">';

        pageStr +='每页显示<select onchange="'+funcName+'(1,this,this.value)">';

        $.each(this.per_choose,function(k,v){

            var selected = (data.per == v)? 'selected="selected"' : '';

            pageStr += '<option '+selected+' value="'+v+'">'+v+'</option>';

        });

        pageStr += '</select>  '

        pageStr += '<a href="javascript:void(0);" class="first" onclick="'+funcName+'(1,this,'+this.per+')">首页</a>';

        pageStr += '<span class="rows">共 '+this.count+' 条记录</span>';

        pageStr += ' <span class="rows">第'+this.nowPage+'页 </span>';

        if(this.totalPage>offset && this.nowPage>offset)

            pageStr += '<a href="javascript:void(0);" class="first" onclick="'+funcName+'(1,this,'+this.per+')">首页</a>';

        if(this.nowPage > 1)

            pageStr += '<a href="javascript:void(0);" class="prev" onclick="'+funcName+'('+(this.nowPage-1)+',this,'+this.per+')">上一页</a>';

        var p;  //字符页码

        for(var i=1; i<=rollPage; i++)

        {

            if(this.nowPage < offset)

                p = i;

            else if(this.nowPage + offset > this.totalPage)

                p = this.totalPage-offset+i;

            else

                p = this.nowPage-offset+i;

            //拼接字符串

            if(p > 0 && p != this.nowPage)

                if(p <= this.totalPage)

                    pageStr += '<a href="javascript:void(0);" class="num" onclick="'+funcName+'('+p+',this,'+this.per+')">'+p+'</a>';

                else

                    break;

            else

            {

                if(this.nowPage > 0 && this.totalPage != 1)

                    pageStr += '<a class="current" >'+p+'</a>';

            }

        }

        if(this.nowPage < this.totalPage)

            pageStr += '<a href="javascript:void(0);" class="next" onclick="'+funcName+'('+(this.nowPage+1)+',this,'+this.per+')">下一页</a>';

        if(this.totalPage>offset && (this.nowPage+offset)<this.totalPage)

            pageStr += '<a href="javascript:void(0);" class="end" onclick="'+funcName+'('+this.totalPage+',this,'+this.per+')">尾页</a>';

        pageStr += '  <span class="rows">共'+this.totalPage+'页</span> ';

        pageStr += '</td></tr>';

        return pageStr;

    }

}