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113 lines
3.0 KiB
113 lines
3.0 KiB
1 month ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>仿京东页面</title>
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<style>
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*{
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padding: 0;
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margin: 0;
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}
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.boxbig{
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position: relative;
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width: 100%;
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height: 40px;
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background-color: #e4e4e4;
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text-align: center;
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line-height: 40px;
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}
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.boxbig ul{
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display:flex;
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/* 小圆点没了 */
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list-style: none;
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justify-content:center;
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}
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.boxbig ul li{
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margin: 0 20px;
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font-size: 20px;
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}
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.boxbig ul li a{
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/* 下划线没了 */
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text-decoration:none;
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color: black;
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border-bottom: 2px solid transparent;
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}
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.boxbig ul li a.active{
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border-color: #e1251b;
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color: #e1251b;
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}
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.box2{
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width: 100%;
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height: 1000px;
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background-color: pink;
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}
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.box2 p{
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font-size: 30px;
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text-align: center;
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margin: 50px 0;
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}
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.box3{
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position: fixed;
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width: 50px;
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height: 50px;
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border-radius: 50%;
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background-color: aliceblue;
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bottom: 15px;
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right: 15px;
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display: none;
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}
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</style>
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</head>
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<body>
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<div class="boxbig" >
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<ul>
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<li><a href="#" class="active">首页</a></li>
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<li><a href="#">动画</a></li>
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<li><a href="#">番剧</a></li>
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<li> <a href="#">音乐</a></li>
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<li> <a href="#">舞蹈</a></li>
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</ul>
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</div>
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<div class="box2">
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<p>到这里出现返回按钮</p>
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</div>
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<div class="box3"></div>
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<script>
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//1.获取元素
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const a=document.querySelectorAll('.boxbig a')
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let i=0
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console.log(a[0])
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for(let i=0;i<a.length;i++){
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a[i].addEventListener('mouseenter',function(){
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console.log('鼠标移入')
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document.querySelector('.boxbig .active').classList.remove('active')
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this.classList.add('active')
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})
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}
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const p=document.querySelector('.box2 p')
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const btn=document.querySelector('.box3')
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const boxbig=document.querySelector('.boxbig')
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//页面滚动事件
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window.addEventListener('scroll',function(){
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// console.log('页面滚动了')
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//页面卷去的头部>=定位位置的距离
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if(window.pageYOffset>=p.offsetTop){
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document.querySelector('.box3').style.display='block'
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}else{
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document.querySelector('.box3').style.display='none'
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}
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})
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//按钮点击事件
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btn.addEventListener('click',function(){
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boxbig.scrollIntoView({
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block:"start"
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})
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})
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</script>
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</body>
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</html>
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