var current = 0,
slides = document.querySelectorAll(".randtext");
setInterval(function() {
for (var i = 0; i < slides.length; i++) {
slides[i].style.opacity = 0;
}
current = (current != slides.length - 1) ? current + 1 : 0;
slides[current].style.opacity = 1;
}, 1000);
.randtext {
position: absolute;
left: 0;
top: 0;
}
.randtext:nth-child(n + 2) {
opacity: 0;
}
.container {
display: flex;
}
<div class="container">
<p class="randtext">text 1</p>
<p class="randtext">text 2</p>
<p class="randtext">text 3</p>
</div>
Пример всего файла
<!DOCTYPE html>
<html>
<head>
<style>
.randtext {
position: absolute;
left: 0;
top: 0;
}
.randtext:nth-child(n + 2) {
opacity: 0;
}
.container {
display: flex;
}
</style>
</head>
<body>
<div class="container">
<p class="randtext">text 1</p>
<p class="randtext">text 2</p>
<p class="randtext">text 3</p>
</div>
<script>
var current = 0,
slides = document.querySelectorAll(".randtext");
setInterval(function () {
for (var i = 0; i < slides.length; i++) {
slides[i].style.opacity = 0;
}
current = (current != slides.length - 1) ? current + 1 : 0;
slides[current].style.opacity = 1;
}, 1000);
</script>
</body>
</html>