请教一个 jQuery 向上滚动问题

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This topic created in 2509 days ago, the information mentioned may be changed or developed.

问题描述：当导航菜单向下滚动超过指定元素高度时自动隐藏，向上则恢复显示，代码如下。

请问能不能修改当向上滚动超过一定像素时才显示，比如 100px。

$(function(){   
    var cubuk_seviye = $(document).scrollTop();
    var header_yuksekligi = $('.yapiskan').outerHeight();
 
    $(window).scroll(function() {
        var kaydirma_cubugu = $(document).scrollTop();
 
        if (kaydirma_cubugu > header_yuksekligi){$('.yapiskan').addClass('gizle');}
        else {$('.yapiskan').removeClass('gizle');}
 
        if (kaydirma_cubugu > cubuk_seviye){$('.yapiskan').removeClass('sabit');}
        else {$('.yapiskan').addClass('sabit');}               
 
        cubuk_seviye = $(document).scrollTop();   
     });
});

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yapiskan'document scrollTop var