HTML + CSS + js 实现轮播图的代码

好的，以下是HTML、CSS、JavaScript实现轮播图的代码：

HTML代码：

<div class="slideshow-container">
    <div class="mySlides fade">
        <img src="image1.jpg" style="width:100%">
    </div>
    <div class="mySlides fade">
        <img src="image2.jpg" style="width:100%">
    </div>
    <div class="mySlides fade">
        <img src="image3.jpg" style="width:100%">
    </div>
    <a class="prev" onclick="plusSlides(-1)">❮</a>
    <a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<div style="text-align:center">
    <span class="dot" onclick="currentSlide(1)"></span>
    <span class="dot" onclick="currentSlide(2)"></span>
    <span class="dot" onclick="currentSlide(3)"></span>
</div>

CSS代码：

* {box-sizing:border-box}
.slideshow-container {
    max-width: 1000px;
    position: relative;
    margin: auto;
}
.mySlides {
    display:none;
}
.prev, .next {
    cursor:pointer;
    position:absolute;
    top:50%;
    width:auto;
    margin-top:-22px;
    padding:16px;
    color:white;
    font-weight:bold;
    font-size:18px;
    transition:0.6s ease;
    border-radius:0 3px 3px 0;
    user-select:none;
}
.next {
    right:0;
    border-radius:3px 0 0 3px;
}
.prev:hover, .next:hover {
    background-color:rgba(0,0,0,0.8);
}
.dot-container {
    text-align:center;
    padding:20px;
    background: #ddd;
}
.dot {
    cursor:pointer;
    height:15px;
    width:15px;
    margin:0 2px;
    background-color:#bbb;
    border-radius:50%;
    display:inline-block;
    transition:background-color 0.6s ease;
}
.active, .dot:hover {
    background-color:#717171;
}

JavaScript代码：

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
    showSlides(slideIndex += n);
}

function currentSlide(n) {
    showSlides(slideIndex = n);
}

function showSlides(n) {
    var i;
    var slides = document.getElementsByClassName("mySlides");
    var dots = document.getElementsByClassName("dot");
    if (n > slides.length) {slideIndex = 1}
    if (n < 1) {slideIndex = slides.length}
    for (i = 0; i < slides.length; i++) {
        slides[i].style.display = "none";
    }
    for (i = 0; i < dots.length; i++) {
        dots[i].className = dots[i].className.replace(" active", "");
    }
    slides[slideIndex-1].style.display = "block";
    dots[slideIndex-1].className += " active";
}

希望能帮到您！