html,body {height:100%;}body {margin:0px;}div {height:100%;}

<div style="background:#FEE;"></div><div style="background:#EFE;"></div><div style="background:#EEF;"></div><div style="background:red;"></div>

document.addEventListener("DOMContentLoaded", function() { var body = document.body, html = document.documentElement; var itv, height = document.body.offsetHeight; var page = scrollTop() / height | 0; //窗口大小改變事件 addEventListener("resize", onresize, false); onresize(); //滾輪事件 document.body.addEventListener( "onwheel" in document ? "wheel" : "mousewheel", function(e) {  clearTimeout(itv);  itv = setTimeout(function() {  var delta = e.wheelDelta / 120 || -e.deltaY / 3;  page -= delta;  var max = (document.body.scrollHeight / height | 0) - 1;  if (page < 0) return page = 0;  if (page > max) return page = max;  move();  }, 100);  e.preventDefault(); } ); //平滑滾動(dòng) function move() { var value = height * page; var diff = scrollTop() - value; (function callee() {  diff = diff / 1.2 | 0;  scrollTop(value + diff);  if (diff) itv = setTimeout(callee, 16); })(); }; //resize事件 function onresize() { height = body.offsetHeight; move(); }; //獲取或設(shè)置scrollTop function scrollTop(v) { if (v == null) return Math.max(body.scrollTop, html.scrollTop); else body.scrollTop = html.scrollTop = v; };});