JSFiddle - React, Tailwind, and code Playground

HTML

<p>1</p>
<a href="#" class="increase">++ Increase</a> 
<br>
<a href="#" class="decrease">-- Decrease</a>

JavaScript

var $i = 0;

$('.increase').click(function () {
    $i++;
    $('p').text($i%5+1);
});

$('.decrease').click(function () {
    $i = --$i==-1?5:$i;
    $('p').text($i%5+1);
});