jquery没法捕捉到scroll

var tuodong = true;

$(document).ready(function(){

    //获取毛标签的位置

    var pos = $('#loading').offset();

    $(window).scroll(function(){

        if($('.goods_con2').attr('conscroll') == 'yes')

        {

        var aid = $('#loading').attr('aid');

        if((parseInt($(document).scrollTop()) + parseInt($(window).height())) > parseInt(pos.top))

        {

            if(aid == 'yes' && tuodong)

            {

                var num = parseInt($('#pageNum').val()) + 1;

                var goodsId = $('#goods_id').val();

                var result = '';

                tuodong = false;

                $.ajax({

                    url:'/detail/voteajax.php',

                    type:'POST',

                    cache: false,

                    dataType:'json',

                    data:{'votes':'dyvote','goods_id':goodsId,'pageNum':num},

                    success:function(data){

                        $('#pageNum').val(data.pagenum);

                        $('#loading').attr('aid',data.param);

                        var objs = data.comments;

                        if(data.param == 'yes')

                        {                                   

                            tuodong = true;

                            for(var i = 0;i<objs.length;i++)