var scrollTop=  $(document).scrollTop();  //滚动条高度 
 
            var contentHeight = $(document).height();//document的内容高度 
 
            var viewH  =$(window).height();    //浏览器可见高度 
            localStorage.scrollHeight=scrollTop; 
 
 
            if(contentHeight - scrollTop -viewH <=10) 
            { 
                localStorage.page++; 
                obj.append_content(localStorage.txt, localStorage.page); 
            }