50 天学习 50 个项目 - HTMLCSS and JavaScript

day35-Image Carousel（图片轮播图简易版）

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>Image Carousel</title>
    <link rel="stylesheet" href="style.css" />
</head>

<body>
    <!-- 轮播图 -->
    <div class="carousel">
        <!-- 图片容器 -->
        <div class="image-container" id="imgs">
            <img src="https://images.unsplash.com/photo-1599394022918-6c2776530abb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1458&q=80"
                alt="first-image" />
            <img src="https://images.unsplash.com/photo-1593642632559-0c6d3fc62b89?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1500&q=80"
                alt="second-image" />
            <img src="https://images.unsplash.com/photo-1599423300746-b62533397364?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1500&q=80"
                alt="third-image" />
            <img src="https://images.unsplash.com/photo-1599561046251-bfb9465b4c44?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1492&q=80"
                alt="fourth-image" />
        </div>
        <!-- 按钮-->
        <button id="left" class="btn">&lt;</button>
        <button id="right" class="btn">&gt;</button>
    </div>

    <script src="script.js"></script>
</body>

</html>

style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

* {
    box-sizing: border-box;
}

body {
    /* background: url('https://source.unsplash.com/random/1000x600') no-repeat center/100% 100%; */
    font-family: 'Roboto', sans-serif;
    /* 居中 */
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

img {
    width: 500px;
    height: 500px;
    /* 元素的内容会被等比例缩放，以便完全覆盖容器的尺寸。这意味着图像或视频的某些部分可能会被裁剪，以使内容填充整个容器，并保持其纵横比。 */
    object-fit: cover;
}

/* 轮播图 */
.carousel {
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
    height: 500px;
    width: 500px;
    /* 超出部分隐藏 */
    overflow: hidden;
    position: relative;
}

/* 图片容器 */
.image-container {
    display: flex;
    transform: translateX(0);
    transition: transform 0.5s ease-in-out;
}

/* 按钮 */
.btn {
    background-color: rgba(0, 0, 0, 0.3);
    color: black;
    border: none;
    cursor: pointer;
    width: 2rem;
    outline: none;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    padding: 0.5rem 0;
}
#left{
    padding-right: 0.5rem;
    border-radius: 0 50% 50% 0;
    left: 0;
}
#right {
    padding-left: 0.5rem;
    border-radius: 50% 0 0 50%;
    right: 0;
}
.btn:hover {
    opacity: 0.9;
}

script.js

// 重点 transform transition
// 1.获取元素节点
const imgs = document.getElementById('imgs')//图片容器
const leftBtn = document.getElementById('left')//上一张按钮
const rightBtn = document.getElementById('right')//下一张按钮

const img = document.querySelectorAll('#imgs img')//所有图片
// 当前图片索引
let idx = 0
// 间隔器
let interval = setInterval(run, 2000)
// 滑动
function run() {
    idx++
    // 改变图片
    changeImage()
}

// 改变图片
function changeImage() {
    if (idx > img.length - 1) {
        idx = 0
    } else if (idx < 0) {
        idx = img.length - 1
    }
    imgs.style.transform = `translateX(${-idx * imgs.offsetWidth}px)`
    imgs.style.transition = `transform 0.5s ease-in-out`
}
// 重置
function resetInterval() {
    clearInterval(interval)
    interval = setInterval(run, 2000)
}
// 下一张
rightBtn.addEventListener('click', () => {
    idx++
    changeImage()
    resetInterval()
})
// 上一张
leftBtn.addEventListener('click', () => {
    idx--
    changeImage()
    resetInterval()
})