code: function(html, over){ 
        html = $(html);
        more.before(html);
        over = over == 0 ? true : null;
        over ? more.html(end) : more.find('a').html(ELEM_TEXT);
        isOver = over;
        lock = null;
        lazyimg && lazyimg();
      }
docs: 加载下一个元素