JSFiddle - React, Tailwind, and code Playground

HTML

<div id="blok"></div>

JavaScript

var peremennaya = '01';
var name01 = 'Маша';

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

if (peremennaya == '01') {
func(name01)
}
if (peremennaya == '02') {
func("Петя")
}