Вы можете добавить атрибуты данных к элементам div и цели в JS
$('#slider-indicator > li').on('click', function() {
var slideNumber = $(this).data('slide');
var slides = $('#slider > div');
var indicators = $('#slider-indicator > li');
// look for slide with same data-slide as the clicked li
for (var i = 0; i < slides.length; i++) {
if (i === slideNumber) {
$(slides[i]).addClass('active');
$(indicators[i]).addClass('active');
} else {
$(slides[i]).removeClass('active');
$(indicators[i]).removeClass('active');
}
}
});
#slider {
margin: 0 0 15px;
padding: 0;
width: 100%;
height: 30vw;
position: relative;
overflow: hidden;
}
#slider div {
margin: 0;
width: 100%;
height: 30vw;
position: absolute;
top: 0;
left: 100%;
background: green;
transition: left 0.4s linear;
color: white;
text-align: center;
padding: 10vw 0;
font-size: 40px;
}
#slider div:nth-child(2n) {
background: blue;
}
#slider div.active {
left: 0;
}
ul {
margin: 0 auto;
padding: 0;
width: 100%;
list-style: none;
color: white;
text-align: center;
font-size: 12px;
}
ul li {
margin: 0 16px;
padding: 8px 12px;
text-align: center;
background: grey;
display: inline-block;
cursor: pointer;
border-radius: 100%;
}
ul li.active {
background: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="slider">
<div class="active">Slide 1</div>
<div>Slide 2</div>
<div>Slide 3</div>
</div>
<ul id="slider-indicator">
<li data-slide="0" class="active">1</li>
<li data-slide="1">2</li>
<li data-slide="2">3</li>
</ul>