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

在这里插入图片描述

index.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

@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

// 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')
    })
})