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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
padding-bottom: 500px;
}
.tab-box {
width: 500px;
height: auto;
border-radius: 6px;
overflow: hidden;
margin: 10px;
}
.tab-nav {
display: flex;
list-style: none;
border-bottom: 1px solid #333;
background: rgb(233, 233, 233);
height: 40px;
flex-direction: row;
flex-wrap: nowrap;
justify-content: center;
align-items: center;
position: relative;
}
.tab-nav a {
margin: 5px;
padding: 0 10px;
text-decoration: none;
color: #000;
height: 40px;
line-height: 40px;
}
.tab-nav a.active {
color: rgb(23, 180, 215);
}
.tab-bar {
position: absolute;
width: 40px;
height: 3px;
background: rgb(23, 180, 215);
bottom: -1px;
transition: all 0.3s;
}
.item-box {
background: rgb(220, 220, 220);
}
.item {
text-align: center;
padding: 10px;
display: none;
}
.item.active {
display: block;
height: 100px;
}
#nav {
width: 100%;
height: 50px;
text-align: center;
line-height: 50px;
background: rgba(120, 182, 191, 0.5);
font-size: 20px;
position: fixed;
top: -50px;
transition: all 0.3s;
z-index: 9999;
}
.box {
margin-top: 10px;
width: 200px;
height: 200px;
background: rgb(144, 193, 230);
margin-bottom: 200px;
border-radius: 6px;
}
.ele-nav {
position: fixed;
bottom: 20%;
background: rgb(233, 233, 233);
right: 10%;
border: 1px solid #333;
border-bottom: 0;
border-radius: 6px;
overflow: hidden;
transition: all 0.3s;
opacity: 0;
z-index: -99;
}
.ele-item.active{
color: rgb(23, 180, 215);
background: rgb(252, 200, 200);
}
.ele-item,
.back-top {
padding: 10px;
border-bottom: 1px solid #333;
user-select: none;
transition: all 0.3s;
}
.ele-item:hover,
.back-top:hover{
color: rgb(23, 180, 215);
}
</style>
</head>
<body>
<div id="nav">导航栏</div>
<div class="tab-box">
<div class="tab-nav">
<a href="javascript:;" class="active">栏1</a>
<a href="javascript:;">栏2</a>
<a href="javascript:;">栏3</a>
<a href="javascript:;">栏4</a>
<a href="javascript:;">栏114514</a>
<div class="tab-bar"></div>
</div>
<div class="item-box">
<div class="item active">项目一</div>
<div class="item">项目二</div>
<div class="item">项目三</div>
<div class="item">项目四</div>
<div class="item">项目114514</div>
</div>
</div>
<div class="ele-nav">
<div class="ele-item">去第一个</div>
<div class="ele-item">去第二个</div>
<div class="ele-item">去第三个</div>
<div class="ele-item">去第四个</div>
<div class="back-top">回到顶部</div>
</div>
<div class="box">第一个盒子,滚动到此(往上55像素)显示导航栏和电梯导航</div>
<div class="box">第二个盒子</div>
<div class="box">第三个盒子</div>
<div class="box">第四个盒子</div>
<script>
const nav = document.querySelector('#nav');
const box = document.querySelectorAll('.box');
const ele_nav = document.querySelector('.ele-nav');
window.addEventListener('scroll', () => {
let n = window.scrollY;
let m = box[0].offsetTop;
let tf = n >= m-55;
nav.style.top = tf ? '0px' : '-50px';
ele_nav.style.opacity = tf ? '1' : '0';
ele_nav.style.zIndex = tf ? '99' : '-99';
});
const bar = document.querySelector('.tab-bar');
const tabNav = document.querySelector('.tab-nav');
const tab_a = document.querySelectorAll('.tab-nav a');
const item = document.querySelectorAll('.item-box .item');
tab_a.forEach((item, index) => {
item.dataset.id = index;
});
tabNav.addEventListener('click', (e) => {
let tag = e.target.tagName;
if (tag === 'A') {
document.querySelector('.tab-nav a.active').classList.remove('active');
document.querySelector('.item.active').classList.remove('active');
e.target.classList.add('active');
item[e.target.dataset.id].classList.add('active');
bar.style.width = `${e.target.offsetWidth}px`;
bar.style.left = `${e.target.offsetLeft}px`;
}
});
tab_a[0].click();
document.querySelectorAll('.ele-item').forEach((item, index) => {
item.dataset.name = `b${index+1}`;
});
box.forEach((item, index) => {
item.classList.add(`b${index+1}`);
});
function reactive(){
let ele_active = document.querySelector('.ele-item.active');
if(ele_active){
ele_active.classList.remove('active');
}
}
ele_nav.addEventListener('click', (e) => {
let cname = e.target.className;
if (cname === 'ele-item'||cname === 'ele-item active') {
reactive();
e.target.classList.add('active');
let box = document.querySelector(`.${e.target.dataset.name}`);
box_num = e.target.dataset.name.replace(/[^\d]/g, " ");
window.scrollTo({
top: box.offsetTop - 50,
left: 0,
behavior: 'smooth'
});
}
if (cname === 'back-top') {
reactive();
window.scrollTo({
top: 0,
left: 0,
behavior: 'smooth'
});
box_num = -1;
}
});
const box_top_arr = Array.from(box).map((item)=>{
return item.offsetTop-55;
})
var box_num = -1;
function scroll_light_ele(){
let n = window.scrollY;
let num = box_top_arr.reduce((prev, item, index)=>{
return n >= item ? index : prev;
},-1);
if(num === box_num){
return;
}else{
box_num = num;
}
if(num > -1){
reactive();
document.querySelector(`[data-name="b${num+1}"]`).classList.add('active');
}else{
box_num = -1;
}
}
window.addEventListener('scroll', scroll_light_ele);
</script>
</body>
</html>
|
