50 天学习 50 个项目 - HTMLCSS and JavaScript
day38-Mobile Tab Navigation（手机tab栏导航切换）
效果
index.html
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Mobile Tab Navigation</title>
<!-- 图标库 -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css"
integrity="sha512-1PKOgIY59xJ8Co8+NE6FZ+LOAZKjy+KY8iq0G4B3CyeY6wYHN3yt9PW0XpSriVlkMXe40PTKnXrLnZ9+fkDaog=="
crossorigin="anonymous" />
<link rel="stylesheet" href="style.css" />
</head>
<body>
<!-- 手机 -->
<div class="phone">
<!-- 图片 -->
<img src="https://images.unsplash.com/photo-1480074568708-e7b720bb3f09?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1053&q=80"
alt="home" class="content show">
<img src="https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80"
alt="work" class="content">
<img src="https://images.unsplash.com/photo-1471107340929-a87cd0f5b5f3?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1266&q=80"
alt="blog" class="content">
<img src="https://images.unsplash.com/photo-1522202176988-66273c2fd55f?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1351&q=80"
alt="about" class="content">
<!-- 手机底部导航 -->
<nav>
<ul>
<li class="active">
<i class="fas fa-home"></i>
<p>首页</p>
</li>
<li>
<i class="fas fa-box"></i>
<p>工作</p>
</li>
<li>
<i class="fas fa-book-open"></i>
<p>博客</p>
</li>
<li>
<i class="fas fa-users"></i>
<p>关于</p>
</li>
</ul>
</nav>
</div>
<script src="script.js"></script>
</body>
</html>style.css
css
@import url('https://fonts.googleapis.com/css?family=Open+Sans&display=swap');
* {
box-sizing: border-box;
}
body {
background-image: linear-gradient(to right,
blue 0%,
skyblue 50%,
blue 100%);
font-family: 'Open Sans', sans-serif;
/* 子元素居中 */
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
margin: 0;
}
/* 手机 */
.phone {
position: relative;
/* 超出部分隐藏 */
overflow: hidden;
border: 5px solid #eee;
border-radius: 15px;
height: 600px;
width: 340px;
}
/* 图片 */
.phone .content {
/* 隐藏 */
opacity: 0;
/* 图片覆盖手机 */
object-fit: cover;
position: absolute;
top: 0;
left: 0;
height: calc(100% - 60px);
width: 100%;
transition: opacity 0.4s ease;
}
/* 显示 */
.phone .content.show {
opacity: 1;
}
/* 底部导航 */
nav {
position: absolute;
bottom: 0;
left: 0;
margin-top: -5px;
width: 100%;
}
nav ul {
background-color: #fff;
display: flex;
/* 去除小圆点 */
list-style-type: none;
padding: 0;
margin: 0;
height: 60px;
}
nav li {
color: #777;
cursor: pointer;
/* flex 平分每一项 */
flex: 1;
padding: 10px;
text-align: center;
}
nav ul li p {
font-size: 12px;
margin: 2px 0;
}
nav ul li:hover,
nav ul li.active {
color: blue;
}script.js
javascript
// 重点 flex classList 注意：在html中一定要使用active和show各一个，否则js中8，9行报错
// 图片用的是定位和opacity
// 1.获取元素节点
const contents = document.querySelectorAll('.content')//所有图片
const listItems = document.querySelectorAll('nav ul li')//所有导航项
// 2.遍历绑定 点击事件
listItems.forEach((item, idx) => {
item.addEventListener('click', () => {
document.querySelector('nav ul li.active').classList.remove('active')
document.querySelector('.content.show').classList.remove('show')
// console.log(this);//this为window 由于箭头函数的原因
item.classList.add('active')
contents[idx].classList.add('show')
})
})