ego008 · March 12, 2021 16:59 · Sep 30, 2013
diff --git a/animatedScrollTo.js b/animatedScrollTo.js
@@ -0,0 +1,31 @@
+document.getElementsByTagName('button')[0].onclick = function () {
+   scrollTo(document.body, 0, 1250);   
+}
+
+function scrollTo(element, to, duration) {
+    var start = element.scrollTop,
+        change = to - start,
+        currentTime = 0,
+        increment = 20;
+
+    var animateScroll = function(){        
+        currentTime += increment;
+        var val = Math.easeInOutQuad(currentTime, start, change, duration);
+        element.scrollTop = val;
+        if(currentTime < duration) {
+            setTimeout(animateScroll, increment);
+        }
+    };
+    animateScroll();
+}
+
+//t = current time
+//b = start value
+//c = change in value
+//d = duration
+Math.easeInOutQuad = function (t, b, c, d) {
+  t /= d/2;
+	if (t < 1) return c/2*t*t + b;
+	t--;
+	return -c/2 * (t*(t-2) - 1) + b;
+};