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Copy pathday1034-elevator-nav.html
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day1034-elevator-nav.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>楼梯导航</title>
<style>
body {
position: relative;
}
.content {
height: 500px;
background-color: #333;
margin-bottom: 8px;
font-size: 400px;
color: #ff7200;
text-align: center;
line-height: 500px;
}
.elevator-nav {
position: fixed;
top: 50%;
transform: translateY(-50%);
right: 16px;
width: 60px;
display: flex;
gap: 4px;
flex-direction: column;
}
.elevator-nav > a {
text-decoration: none;
color: #fff;
padding: 6px;
background-color: #666;
text-align: center;
cursor: pointer;
font-size: 30px;
}
</style>
</head>
<body>
<nav class="elevator-nav"><a href="#">1</a><a href="#">2</a><a href="#">3</a><a href="#">4</a><a
href="#">5</a><a
href="#">6</a><a href="#">7</a><a href="#">8</a><a href="#">9</a><a href="#">10</a></nav>
<section class="content">1</section>
<section class="content">2</section>
<section class="content">3</section>
<section class="content">4</section>
<section class="content">5</section>
<section class="content">6</section>
<section class="content">7</section>
<section class="content">8</section>
<section class="content">9</section>
<section class="content">10</section>
<script>
function nodeIndexOf(node) {
const siblings = node.parentNode.children;
for (let i = 0; i < siblings.length; i++) {
if (node === siblings[i]) {
return i;
}
}
return -1;
}
const oDoc = document.documentElement;
const oNav = document.querySelector(".elevator-nav");
const aContent = document.querySelectorAll(".content");
function smoothScrollEffect(scrollableElem) {
let scrollAnimationHandle, scrollTopStops, scrollTopStopsIdx;
function scrollToElement(elem, durationMilliSec = 300) {
clearInterval(scrollAnimationHandle);
scrollTopStops = [];
scrollTopStopsIdx = 0;
const parent = scrollableElem;
const currentDocPos = parent.scrollTop;
const targetPos = elem.offsetTop;
const tickCnt = Math.ceil(durationMilliSec / (1000 / 60));
scrollTopStops = interpolate(currentDocPos, targetPos, tickCnt);
scrollTopStops.push(targetPos);
scrollAnimationHandle = setInterval(() => {
parent.scrollTop = scrollTopStops[scrollTopStopsIdx++];
if (scrollTopStopsIdx === scrollTopStops.length) {
clearInterval(scrollAnimationHandle);
scrollTopStops = [];
scrollTopStopsIdx = 0;
}
}, 1000 / 60);
}
return scrollToElement;
}
function interpolate(from, to, cnt) {
const step = (to - from) / (cnt + 1);
return new Array(cnt).fill(null).map((_, idx) => from + (idx + 1) * step);
}
const scrollToElement = smoothScrollEffect(oDoc);
oNav.addEventListener("click", (e) => {
e.preventDefault();
const id = nodeIndexOf(e.target);
scrollToElement(aContent[id]);
});
</script>
</body>
</html>