激活所有浏览器。祝你好运

var process;
        var delay = 50; //milisecond scroll top
        var scrollPixel = 20; //pixel U want to change after milisecond
        //Fix Undefine pageofset when using IE 8 below;
        function getPapeYOfSet() {
            var yOfSet = (typeof (window.pageYOffset) === "number") ? window.pageYOffset : document.documentElement.scrollTop;
            return yOfSet;
        }



        function backToTop() {
            process = setInterval(function () {
                var yOfSet = getPapeYOfSet();
                if (yOfSet === 0) {
                    clearInterval(process);
                } else {
                    window.scrollBy(0, -scrollPixel);
                }
            }, delay);
        }

试试这个

<script>
    $(window).scrollTop(100);
</script>

尝试此操作以在顶部滚动

<script>
 $(document).ready(function(){
    $(window).scrollTop(0);
});
</script>

function scrolltop() {

    var offset = 220;
    var duration = 500;

    jQuery(window).scroll(function() {
        if (jQuery(this).scrollTop() > offset) {
            jQuery('#back-to-top').fadeIn(duration);
        } else {
            jQuery('#back-to-top').fadeOut(duration);
        }
    });

    jQuery('#back-to-top').click(function(event) {
        event.preventDefault();
        jQuery('html, body').animate({scrollTop: 0}, duration);
        return false;
    });
}

为什么不使用JQuery内置函数scrollTop：

$('html, body').scrollTop(0);//For scrolling to top

$("body").scrollTop($("body")[0].scrollHeight);//For scrolling to bottom

简短而简单！

请检查以下代码，这肯定会有帮助。：）

document.querySelector('.sample-modal .popup-cta').scrollIntoView(true);
document.querySelector('.sample-modal').style.scrollPadding = '50px'; //to move to the top when scrolled up.