JSFiddle - React, Tailwind, and code Playground

HTML

<button type="button" onclick="alert('botao 1');" class="tal_classe">Tal classe</button>
<button type="button" onclick="alert('botao 2');" class="tal_classe">Tal classe</button>
<button type="button" onclick="clicar()">Clicar nos botões</button>

JavaScript

function clicar() {
    var botoes = document.querySelectorAll('button.tal_classe');
    for (var i = 0; i < botoes.length; i++) botoes[i].onclick.apply(botoes[i])
}