JSFiddle - React, Tailwind, and code Playground

HTML

<div onclick="func()" class="knopka">Кнопка</div>
<div id="blok"></div>

CSS

.knopka {
  text-align: center;
  padding: 15px;
  color: #fff;
  font-size: 18px;
  background-color: #000;
  cursor: pointer;
}

JavaScript

var name = '';
var name01 = 'Коля';
var div = document.createElement("div"); 
div.innerHTML = "<div>"+name+"</div>";
function func() {
name = name01;
document.getElementById("blok").appendChild(div); 
	}