exports.list = function(req,res) {

    var params = {};
    var current_page = common_util.get_param_value(req,‘current_page‘,‘Number‘,1);
    var page_size = common_util.get_param_value(req,‘page_size‘,‘Number‘,10);
    var start_index = common_util.get_start_index(current_page,page_size);

    Topic.find(params).skip(start_index).limit(page_size).sort({‘reply_time‘:-1}).exec(function(err,docs){
        if(err) {
            console.error(err);
        }else {
            Topic.count(params,function(err,count){
                if(err){
                    console.error(err);
                }else{
                    docs.forEach(function(doc){
                        doc.interval = date_util.interval(doc.last_reply_time);
                    });

                    Category.find({}, function (err, categoryList) {
                        if (err) {
                            console.error(err);
                        } else {
                            var result = {};
                            result.current_page = current_page;
                            result.page_size = page_size;
                            result.total_count = count;
                            resutl.total_page = common_util.get_total_page(count,page_size);
                            result.datas = docs;
                            result.categoryList = categoryList;
                            console.dir("hello");
                            console.dir(result);
                            res.render(‘index‘, result);
                        }
                    });
                }
            });
        }
        });
}

exports.list = function(req,res) {
    var params = {};
    var current_page = common_util.get_param_value(req,‘current_page‘,‘Number‘,1);
    var page_size = common_util.get_param_value(req,‘page_size‘,‘Number‘,10);
    var start_index = common_util.get_start_index(current_page,page_size);
    async.parallel({
       datas:function(cb){
           Topic.find(params).skip(start_index).limit(page_size).sort({‘reply_time‘:-1}).exec(function(err,docs){
               cb(err,docs);
           });
       },
       total_count:function(cb){
           Topic.count(params,function(err,count){
               cb(err,count);
           });
       },
       categoryList:function(cb){
           Category.find({}, function (err, categoryList) {
               cb(err,categoryList);
           });
       }
    },function(err,results){
        if(err){
            console.error(err);
        }else{
            results.current_page = current_page;
            results.page_size = page_size;
            results.total_page = common_util.get_total_page(results.total_count,page_size);
            res.render(‘index‘, results);
        }
    });
}

{ datas: 
   [ { _id: 539c156dce6d3ea40f1f1d15,
       author: ‘yekai‘,
       content: ‘<p>\n\t<span style="font-family:微软雅黑, Tahoma, Verdana, 宋体;font-size:16px;line-height:26px;background-color:#FFFFFF;">由于网站刚刚建立，并没有提供什么特别的内容，仅仅是将官方主页的内容翻译过来而已，而且也有部分的错误，不过相信以后该网站会成为了解Ubuntu在中国的动态的一个窗 口。</span>\n</p>\n<p>\n\t<span style="font-family:微软雅黑, Tahoma, Verdana, 宋体;font-size:16px;line-height:26px;background-color:#FFFFFF;"><img src="http://static.cnbetacdn.com/newsimg/2014/0613/25_1jCLSOQac.png_w600.png"  /><br />\n</span>\n</p>‘,
       category: ‘other‘,
       title: ‘Ubuntu 中国官网现已面世‘,
       __v: 1,
       last_reply_time: Tue Jun 17 2014 21:54:33 GMT+0800 (中国标准时间),
       last_reply_username: ‘yekai‘,
       reply_amount: 2,
      },
     { _id: 53a04500e5cb4710178753a5,
       last_reply_username: ‘yekai‘,
       last_reply_time: Tue Jun 17 2014 21:44:52 GMT+0800 (中国标准时间),
       author: ‘yekai‘,
       content: ‘赌球输了‘,
       category: ‘world_cup‘,
       title: ‘德国赢了‘,
       __v: 2,
       reply_amount: 3,
      },
     { _id: 539c16fe9e359e841cc1b097,
       author: ‘yekai‘,
       content: ‘<p>\n\t<span style="color:#434343;font-family:微软雅黑, Tahoma, Verdana, 宋体;font-size:16px;line-height:24px;background-color:#FBFBFB;">据国外媒体报道，研究人员最新研究表明，地球最大蓄水层位于美国境内之下的地幔层，大约在地下643.7公里(400英里)处。</span>\n</p>\n<p>\n\t<span style="color:#434343;font-family:微软雅黑, Tahoma, Verdana, 宋体;font-size:16px;line-height:24px;background-color:#FBFBFB;"><img src="http://static.cnbetacdn.com/newsimg/2014/0614/51_1jCUT0h0z.jpg_w600.jpg"  /><br />\n</span>\n</p>‘,
       category: ‘other‘,
       title: ‘美国地下643.7公里发现地球最大“蓄水池”‘,
       __v: 2,
       last_reply_time: Tue Jun 17 2014 22:06:43 GMT+0800 (中国标准时间),
       last_reply_username: ‘afei‘,
       reply_amount: 3,
       } ],
  total_count: 3,
  categoryList: 
   [ { _id: 5397181a1f7f534418cbbd84,
       desc: ‘Java类别‘,
       code: ‘Java‘,
       name: ‘Java‘,
       __v: 0 },
     { _id: 53971d90e209ea6414b2819f,
       desc: ‘‘,
       code: ‘Nodejs‘,
       name: ‘Nodejs‘,
       __v: 0 },
     { _id: 5399b429a068211816605fbb,
       desc: ‘‘,
       code: ‘world_cup‘,
       name: ‘世界杯‘,
       __v: 0 },
     { _id: 539c1526ce6d3ea40f1f1d14,
       desc: ‘‘,
       code: ‘other‘,
       name: ‘其他‘,
       __v: 0 } ],
  current_page: 1,
  page_size: 10,
  total_page: 1 }