animated scroll to anchor without jquery
function animate(elem, style, unit, from, to, time, prop) { if (!elem) { return; } var start = new Date().getTime(), timer = setInterval(function () { var step = Math.min(1, (new Date().getTime() - start) / time); if (prop) { elem[style] = (from + step * (to - from))+unit; } else { elem.style[style] = (from + step * (to - from))+unit; } if (step === 1) { clearInterval(timer); } }, 25); if (prop) { elem[style] = from+unit; } else { elem.style[style] = from+unit; } } window.onload = function () { var target = document.getElementById("div5"); animate(document.scrollingElement || document.documentElement, "scrollTop", "", 0, target.offsetTop, 2000, true); };
