JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.3/jquery.min.js"></script>
<ul class="test-class">
<li>Birinci Sıra</li>
<li>İkinci Sıra</li>
</ul>

<ul class="test-class2">
<li>2.Birinci Sıra</li>
<li>2.İkinci Sıra</li>
</ul>


<p><button id="btn2">Append list items</button>

JavaScript

$("#btn2").click(function(){
	$("ul.test-class").append("<li>Appended item</li>");
})