Как сделать Slideshow с помощью JavaScript

HTML

<!DOCTYPE html>
<html lang="en">

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

<body>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="1.jpg" style="width: 100%">
<div class="text">Caption Text</div>
</div>

<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="2.jpg" style="width: 100%">
<div class="text">Caption Two</div>
</div>

<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="3.jpeg" style="width: 100%">
<div class="text">Caption Three</div>
</div>

<a class="prev" onclick="plusSlides(-1)">&#10094;</a>
<a class="next" onclick="plusSlides(1)">&#10095;</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>

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

</html>

CSS

* {
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 3 px 0;
}

.next {
right: 0;
border-radius: 3px 0 0 3px;
}

.prev:hover,
.next:hover {
background-color: rgba(0, 0, 0, 0.8);
}

text {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}

.dot {
cursor: pointer;
height: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}

.active,
dot:hover {
background-color: #717171;
}

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

@-webkit-keyframes fade {
from {
opacity: .4
}

to {
opacity: 1
}
}

@keyframes fade {
from {
opacity: .4
}

to {
opacity: 1
}

}

JS

var slideIndex = 1;
showSlides(slideIndex);

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

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

function showSlides(n) {
var i,
slides = document.getElementsByClassName("mySlides"),
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";
}

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