jquery实现页面滚动时自动加载内容

var loading = false;

$(window).scroll(function()...{

    if((($(window).scrollTop()+$(window).height())+250)>=$(document).height())...{

        if(loading == false)...{

            loading = true;

            $('#loadingbar').css("display","block");

            $.get("url?start="+$('#loaded_max').val(), function(loaded)...{

                $('body').append(loaded);

                $('#loaded_max').val(parseInt($('#loaded_max').val())+50);

                $('#loadingbar').css("display","none");

                loading = false;

            });

        }

    }

});

 

$(document).ready(function() ...{

    $('#loaded_max').val(50);

});