How to make slow the Scroll-Top Speed

ScrollTop is a jquery plugin (go to top of page), trying to make slow Scroll Speed, but not working. I have changed scrollSpeed : 'fast', to scrollSpeed : 'slow', but it still fast, nothing change.

JS:

$.fn.extend({

    addScrollTop: function(options) {

        var defaults = {
                useObjWindow : false,
                scrollSpeed : 'fast',
                zIndex: '99'
            }

            var options = $.extend(defaults, options);  

        if($('body').find('.scrollTop-btn').length == 0) {
            $('body').append('<div class="scrollTop-btn" style="display:none;"><i class="fa fa-chevron-up"></i></div>');
        }

        if(options.useObjWindow) {
            var parentWindow = this;
            var scrollWindow = this;
        }
        else {
            var parentWindow = window;
            var scrollWindow = 'html, body';
        }

        $(document).ready(function() {

            $('.scrollTop-btn').on('click', function() {
                $(scrollWindow).animate({scrollTop:0}, options.scrollSpeed);
            });

            $(parentWindow).scroll(function() { 
                $('.scrollTop-btn').hide();
                var aTop = $('.scrollTop-btn').height() + 20;

                if($(this).scrollTop() >= (aTop + 20)) {
                    $('.scrollTop-btn').css('z-index', options.zIndex);
                    $('.scrollTop-btn').show();
                }
                else {
                    if($('.scrollTop-btn').is(":visible")) {
                        $('.scrollTop-btn').hide();
                    }
                }

            });


        });
    }

});

Call:

jQuery(document).ready(function() {
jQuery("body").addScrollTop();
});

How to make it slower or smoother, when it go to top?

Answer

use jquery animate()

$('html,body').animate({ scrollTop: 0 }, 'slow');

refer this stack overflow question

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Answer