JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">Div 1</div>
<div id="div2">Div 2</div>
<div id="div3">Div 3</div>

<button id="btn1" class="btn">Button 1</button>
<button id="btn2" class="btn">Button 2</button>
<button id="btn3" class="btn">Button 3</button>

JavaScript

$(".btn").click(function(e){
    var divId = this.id.replace("btn","div");
    $("#"+divId).css("color","red");
});