var intf_url="http://jb51.net/intf";
var pathUrl = "http://jb51.net/";
var page=1;
var isLoadRB=false; 
var ul_select=$("#fansList");
var btn_more=$("#loading");
if(ul_select.length <1) return ;
var is_more =true;
//跨域请求接口
function loadjs(src,callback){
 var js= document.createElement('script');
 js.src = src;
 js.onreadystatechange = js.onload =function(){
 if(!js.readyState || js.readyState=='loaded'
  || js.readyState=='complete'){
  if(callback){callback()||callback};
 }
};
js.charset="utf-8";
document.getElementsByTagName('head')[0].appendChild(js);
}
//回调函数
function fill(data){
if(data.pageCount==data.pageNo){
 is_more=false;//如果数据全部加载完毕，取消加载
    $("#loading").html("加载完毕");
}
}
//解析接口
function queryIntf(){
var url=page==1?intf_url+".json":intf_url+"_page"+page+".json";
loadJs(url,callback);
}
function callback(){
page++;
}
/*判断是否要加载接口*/
function needtoloadRB(){
 var btn_top=btn_more.offset().top;
 var window_height=$(window).height();
 var scroll_Top=$(window).scrollTop();
 return btn_top<scroll_Top+window_height?true:false;
}
$(window).scroll(function(){
 var _needload=needtoloadRB();
 if(_needload && isLoadRB==false &&is_more){isLoadRB=true;queryintf();}
})
window.onload = function(){
 queryintf(); 
}

fill({"fans":[{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"},{"nickname":"蔡宝坚","website":"jb51.net","youzhi":"2.5","time":"3分钟前"}],"pageCount":2,"pageNo":1,"pageSize":10,"totalSize":20
});

<div id="page_nav">
  <a href="next_link">下一页</a>
</div>

#page_nav {clear: both; text-align: center; }

nextHref = $("#next_page a").attr("href");
// 给浏览器窗口绑定 scroll 事件
$(window).bind("scroll",function(){
  // 判断窗口的滚动条是否接近页面底部
  if( $(document).scrollTop() + $(window).height() > $(document).height() - 10 ) {
    // 判断下一页链接是否为空
    if( nextHref != undefined ) {
      // Ajax 翻页
      $.ajax( {
        url: $("#page_nav a").attr("href"),
        type: "POST",
        success: function(data) {
          result = $(data).find("#thumbs .imgbox");
          nextHref = $(data).find("#page_nav a").attr("href");
          $("#page_nav a").attr("href", nextHref);
          $("#thumbs").append(result);
        }
      });
    } else {
      $("#page_nav").remove();
    }
  }
});

$newElems = $result;
$newElems.imagesLoaded(function(){
  $container.masonry( 'appended', $newElems, true );
});

<div id="page_loading">
  <span>给力加载中……</span>
</div>

nextHref = $("#next_page a").attr("href");
// 给浏览器窗口绑定 scroll 事件
$(window).bind("scroll",function(){
  // 判断窗口的滚动条是否接近页面底部
  if( $(document).scrollTop() + $(window).height() > $(document).height() - 10 ) {
    // 判断下一页链接是否为空
    if( nextHref != undefined ) {
      // 显示正在加载模块
      $("#page_loading").show("slow");
      // Ajax 翻页
      $.ajax( {
        url: $("#page_nav a").attr("href"),
        type: "POST",
        success: function(data) {
          result = $(data).find("#thumbs .imgbox");
          nextHref = $(data).find("#page_nav a").attr("href");
          $("#page_nav a").attr("href", nextHref);
          $("#thumbs").append(result);
          // 把新的内容设置为透明
          $newElems = result.css({ opacity: 0 });
          $newElems.imagesLoaded(function(){
            $container.masonry( 'appended', $newElems, true );
            // 渐显新的内容
            $newElems.animate({ opacity: 1 });
            // 隐藏正在加载模块
            $("#page_loading").hide("slow");              
          });
 
        }
      });
    } else {
      $("#page_loading span").text("木有了噢，最后一页了！");
      $("#page_loading").show("fast");
      setTimeout("$('#page_loading').hide()",1000);
      setTimeout("$('#page_loading').remove()",1100);
    }
  }
});