原生JS代碼實現圖片輪播功能

index.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>輪播圖</title>
    <link rel="stylesheet" href="style.css">
</head>

<body>
    <div class="container">
        <div class="wrap" style="left: -600px;">
            <img src="./image/img_5.jpg" alt="5">
            <img src="./image/img_1.jpg" alt="1">
            <img src="./image/img_2.jpg" alt="2">
            <img src="./image/img_3.jpg" alt="3">
            <img src="./image/img_4.jpg" alt="4">
            <img src="./image/img_5.jpg" alt="5">
            <img src="./image/img_1.jpg" alt="1">
        </div>
        <div class="buttons">
            <span class="on"></span>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </div>
        <a href="javascript:void (0);" rel="external nofollow" class="arrow arrow_left">
            <</a> <a href="javascript:void (0);" rel="external nofollow" class="arrow arrow_right">>
        </a>
    </div>
    <script src="carousel.js"></script>
</body>

</html>

style.css

* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

.container {
    position: relative;
    width: 600px;
    height: 400px;
    margin: 100px auto 0 auto;
    box-shadow: 0 0 5px rgb(180, 182, 180);
    overflow: hidden;
}

.container .wrap {
    position: absolute;
    width: 4200px;
    height: 400px;
    z-index: 1;
}

.container .wrap img {
    float: left;
    width: 600px;
    height: 400px;
}

.container .buttons {
    position: absolute;
    right: 5px;
    bottom: 30px;
    width: 120px;
    height: 10px;
    z-index: 2;
}

.container .buttons span {
    margin-left: 5px;
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgb(211, 212, 211);
    text-align: center;
    color: white;
    cursor: pointer;
}

.container .buttons span.on {
    background-color: rgb(151, 150, 150);
}

.container .arrow {
    position: absolute;
    top: 40%;
    color: rgb(179, 182, 179);
    padding: 0px 15px;
    border-radius: 50%;
    font-size: 50px;
    z-index: 2;
    display: none;
}

.container .arrow_left {
    left: 10px;
}

.container .arrow_right {
    right: 10px;
}

.container:hover .arrow {
    display: block;
}

.container .arrow:hover {
    background-color: rgba(0, 0, 0, 0.2);
}

carousel.js

// 下一頁
function next_pic(wrap) {
    index++;
    if (index > 4) {
        index = 0;
    }
    showCurrentDot(wrap);
    var newLeft;
    if (wrap.style.left === "-3600px") {
        newLeft = -1200;
    } else {
        newLeft = parseInt(wrap.style.left) - 600;
    }
    wrap.style.left = newLeft + "px";
}
// 上一頁
function prev_pic(wrap) {
    index--;
    if (index < 0) {
        index = 4;
    }
    showCurrentDot(wrap);
    var newLeft;
    if (wrap.style.left === "0px") {
        newLeft = -2400;
    } else {
        newLeft = parseInt(wrap.style.left) + 600;
    }
    wrap.style.left = newLeft + "px";
}
// 定時器 --- 自動播放
let timer = null;

function autoPlay(wrap) {
    timer = setInterval(function () {
        next_pic(wrap);
    }, 2000);
}

// 圓點導航
let index = 0;
let dots = document.getElementsByTagName("span");
// 顯示當前是第幾張圖片
function showCurrentDot(wrap) {
    for (var i = 0, len = dots.length; i < len; i++) {
        dots[i].className = "";
    }
    dots[index].className = "on";
}
//最開始和最後的照片修整
for (var i = 0, len = dots.length; i < len; i++) {
    (function (i) {
        let wrap = document.querySelector(".wrap");
        dots[i].onclick = function () {
            var dis = index - i;
            if (index == 4 && parseInt(wrap.style.left) !== -3000) {
                dis = dis - 5;
            }
            //和使用prev和next相同，在最開始的照片5和最終的照片1在使用時會出現問題，導致符號和位數的出錯，做相應地處理即可
            if (index == 0 && parseInt(wrap.style.left) !== -600) {
                dis = 5 + dis;
            }
            wrap.style.left = (parseInt(wrap.style.left) + dis * 600) + "px";
            index = i;
            showCurrentDot(wrap);

        }
    })(i);
}

function init() {
    var wrap = document.querySelector(".wrap");
    var next = document.querySelector(".arrow_right");
    var prev = document.querySelector(".arrow_left");
    // 當鼠標點擊上下箭頭
    next.onclick = function () {
        next_pic(wrap);
    }
    prev.onclick = function () {
        prev_pic(wrap);
    }
    //啓動定時器
    autoPlay(wrap);
    // 鼠標滑過 取消自動播放
    var container = document.querySelector(".container");
    container.onmouseenter = function () {
        clearInterval(timer);
    }
    container.onmouseleave = function () {
        autoPlay(wrap);
    }
}
window.addEventListener('load', init, false);

image

img_1.jpg