javascript实现图片切换的幻灯片效果源代码

当然，我可以为你提供一个简单的JavaScript实现图片切换的幻灯片效果的示例代码。这个示例将使用HTML来展示图片，CSS来设置基本的样式，以及JavaScript来控制图片的自动切换。

**HTML部分（index.html）**:


<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>幻灯片效果</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<div class="slideshow-container">
    <div class="mySlides fade">
        <img src="img1.jpg" style="width:100%">
    </div>

    <div class="mySlides fade">
        <img src="img2.jpg" style="width:100%">
    </div>

    <div class="mySlides fade">
        <img src="img3.jpg" style="width:100%">
    </div>

    <!-- 可以在这里继续添加更多幻灯片 -->

    <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>
    <!-- 可以在这里继续添加更多圆点，与幻灯片数量匹配 -->
</div>

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

**CSS部分（styles.css）**:


.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}

.mySlides {
  display: none;
}

.fade {
  -animation-name: fade;
  -animation-duration: 1.5s;
}

@keyframes fade {
  from {opacity: .4}
  to {opacity: 1}
}

/* 前进和后退按钮 */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

/* 位置设置 */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* 圆点导航 */
.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;
}

/* 响应式设计 */
@media only screen and (max-width: 600px) {
  .prev, .next,.text {font-size: 11px}
}

**JavaScript部分（script.js）**:

`javascript

let slideIndex = 1;

showSlides(slideIndex);

// 下一张幻灯片

function plusSlides(n) {

showSlides(slideIndex += n);

}

// 当前幻灯片

function currentSlide(n) {

showSlides(slideIndex = n);

}

function showSlides(n) {

let i;

let slides = document.getElementsByClassName("mySlides");

let dots = document.getElementsByClassName("dot");

if (n > slides.length) {slideIndex = 1}

if (n < 1) {slideIndex = slides.length}

for (i = 0;