jquery 滚动到底部时自动加载更多详解编程语言

var loading = false; 
$(window).scroll(function () 
{ 
    if ((($(window).scrollTop() + $(window).height()) + 250) >= $(document).height()) 
    { 
        if (loading == false) 
        { 
            loading = true; 
            $('#loadingbar').css("display", "block"); 
            $.get("load.php?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); 
} 
);