获取窗口顶部距离

获取div距离当前窗口顶部距离

$(window).scroll( function (){
    var topPin =$('.graphic_box').offset().top - $(window).scrollTop();
    console.log(topPin)
});

获取div距离当前窗口底部距离

$(window).scroll( function (){
    var topPin =$('.faq_big_box').height() - $(window).scrollTop() - $(window).height();
    console.log(topPin)
});