Zepto.js smooth vertical scrolling method. Implementing this code turns all anchor links with the class "scrollTo" into smooth scrolling anchor links. Rework of the foundation.js library method.

zepto.smoothScroll.js

function smoothScroll(el, to, duration) {
    if (duration < 0) {
        return;
    }
    var difference = to - $(window).scrollTop();
    var perTick = difference / duration * 10;
    this.scrollToTimerCache = setTimeout(function() {
        if (!isNaN(parseInt(perTick, 10))) {
            window.scrollTo(0, $(window).scrollTop() + perTick);
            smoothScroll(el, to, duration - 10);
        }
    }.bind(this), 10);
}
$('.scrollTo').on('click', function(e) {
    e.preventDefault();
    smoothScroll($(window), $($(e.currentTarget).attr('href')).offset().top, 200);
});

This is the console error when I use your script. Why are you using .scrollTop on line 5?
Uncaught TypeError: Object # has no method 'scrollTop'

Thanks. It works well for me.

Thanks for this!