$(window).scroll(function () {
      var scrollTop = $(this).scrollTop();
      var scrollHeight = $(document).height();
      var windowHeight = $(this).height();


      if (scrollTop + windowHeight >= scrollHeight) {
        loadPromotions();
      }

    });

   var page = 1;
   var morAvaliable = true;//标识还有数据可以加载
   function loadPromotions() {
    if (morAvaliable) {
      var href = location.href.split(\'?\')[0];
      var pageSize = 5;
      page++;
      $.post(href,
        {
          pageNo: page,
          pageSize: pageSize
        }
        , function (data) {
          if (data.length) {
            var html = \'\';
            $.each(data, function (i, list) {
              html += \'<div class=\"task-time\">\' + list.CreateTime + \'</div>\';
              html += \'<a class=\"task-box\" href=\"\' + list.Url + \'\">\';
              html += \'<h5>\' + list.Title + \'</h5>\';
            });
            $(\'#promotionList\').append(html);
          }
          else {
            morAvaliable = false;
            $(\'#loading\').html(\'没有更多分享信息了\');
          }
        }
      );
    }
  }