<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<!-- <link href="./animate.css"> -->
<style>
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
div {
font-size: 30px;
text-align: center;
}
body {
overflow: hidden;
}
.fir {
background-color: aliceblue;
transition: all 2s;
}
.sec {
background-color: antiquewhite;
transition: all 2s;
}
.thr {
background-color: aqua;
transition: all 2s;
}
.fou {
background-color: aquamarine;
transition: all 2s;
}
.fiv {
background-color: bisque;
transition: all 2s;
}
.page .active {
color: green;
background-color: blueviolet;
}
.active .sec {
background-color: red;
}
</style>
</head>
<body>
<div id='wrap'>
<div class="page fir">
<div class="animated">page one</div>
</div>
<div class="page sec">
<div>page two</div>
</div>
<div class="page thr">
<div>page three</div>
</div>
<div class="page fou">
<div>page four</div>
</div>
<div class="page fiv">
<div>page five</div>
</div>
</div>
<script>
window.onload = function () {
var wrap = document.getElementById('wrap');
var page = document.getElementsByClassName('page');
var pagelength = page.length;
var index = 0;
// wrap.style.height=window.innerHeight*pagelength+'px';
for (var i = 0; i < pagelength; i++) {
page[i].style.height = window.innerHeight + 'px';
page[i].setAttribute('id', i)
}
document.body.scrollTop = 0;
document.addEventListener('mousewheel', wheel)
var istrue = true;
function wheel(e) {
if (istrue) {
istrue = false;
var st=document.body.scrollTop||document.documentElement.scrollTop;
var dh=document.documentElement||document.body;
if (e.wheelDelta > 0) {
console.log(e.wheelDelta)
var pageh = st - window.innerHeight;
pageh = pageh < 0 ? 0 : pageh;
index = pageh / window.innerHeight;
//
for (var i = 0; i < pagelength; i++) {
page[i].classList.remove('active')
}
page[index].classList.add('active')
animation(dh, {
'scrollTop': pageh
}, function () {
istrue = true;
})
} else {
console.log(st)
var pageh = st + window.innerHeight;
var maxh = wrap.offsetHeight - window.innerHeight;
pageh = pageh > maxh ? maxh : pageh;
index = pageh / window.innerHeight;
for (var i = 0; i < pagelength; i++) {
page[i].classList.remove('active')
}
page[index].classList.add('active')
animation(dh, {
'scrollTop': pageh
}, function () {
istrue = true;
})
}
}
}
function animation(obj, json, fn) {
clearInterval(obj.timer);
//表示运动是否都已经停止
var flag = true;
obj.timer = setInterval(function () {
//循环json
for (var i in json) {
if (i == 'opacity') {
//获取透明度值，round四舍五入去除小数点
var icur = Math.round(parseFloat(getStyle(obj, i)) * 100);
} else {
//获取属性值
var icur = parseInt(getStyle(obj, i)) || obj[i];
}
//缓冲运动，speed随时变换
var speed = (json[i] - icur) / 10; //千万要写在定时器里面，写在外面会有意想不到的后果
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //速度向上或者下取整，防止到不了over位置
//如果有一个没到达终点就是false
if (json[i] !== icur) {
flag = false;
} else {
flag = true;
}
if (i == 'opacity') {
obj.style.filter = 'alpha(opacity:' + (icur + speed) + ')'; //IE兼容
obj.style.opacity = (icur + speed) / 100;
} else if (obj[i] || obj[i] == 0) {
obj[i] = icur + speed;
} else {
obj.style[i] = icur + speed + 'px';
}
// console.log(icur + ' ' + json[i]);
}
//检查是否所有的运动都已经停止
if (flag) {
clearInterval(obj.timer);
if (fn) {
fn();
}
}
}, 13);
}
/**
*函数作用：返回样式属性值
*接受参数：obj（需要获取属性的DOM元素）
* attr（需要获取的属性名称）
*/
function getStyle(obj, attr) {
if (obj.currentStyle) {
return obj.currentStyle[attr]; //IE兼容
} else {
return getComputedStyle(obj, false)[attr];
}
}
}
</script>
</body>
</html>