css部分：
div:nth-child(1){background-color:red;}
div:nth-child(2){background-color:blue;}
div:nth-child(3){background-color:green;}
div:nth-child(1){background-color:pink;}
html部分：
<body style="overflow:hidden">
<div><span>1</span></div>
<div><span>2</span></div>
<div><span>3</span></div>
<div><span>4</span></div>
</body>
js部分:
<script>
var div=document.getElementsByTagName("div");
if(window.addEventListener){
window.addEventListener("DOMMouseScroll",wheel);}
window.onmousewheel=wheel;
function wheel(ev){
var e=ev||window.event;
var limit=div[0].offsetHeight;
var deita=0;
if(e.wheelDelta){
deita=e.wheelDelta;}
esle if(e.detail){
delta=-e.detail}
if(delta<0){
var down=setInterval(function(){
scroll=document.documentElement.scrollTop||document.body.scrollTop;
window.onmousewheel=null;
if(window.addEventListener){
window.removeEventListener("DOMMouseScroll",wheel)}
window.scrollBy(0,1);
if(scroll%limit<1){
clearInterval(down);
if(window.addEventListener){
window.addEventListener("DOMMouseScroll",wheel)}
window.onmousewheel=wheel;}},1);}
else{var up=setInterval(function(){
scroll=document.documentElement.scrollTop||document.body.scrollTop;
window.scrollBy(0,-1);
window.onmousewheel=null;
if(scroll%limit<1){
clearInterval(down);
if(window.addEventListener){
window.addEventListener("DOMMouseScroll",wheel)}
window.onmousewheel=wheel;}},1);}}
</scrip>