JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id="btnAlunos" value="Alunos" />

JavaScript

function aluno() {
    alert("Eu sou um aluno");
}

function professor() {
    alert("Agora eu sou professor");
}
document.getElementById("btnAlunos").onclick = function() {
    var idOriginal = this.id;
    this.value = "Professor";
    this.id = "btnProfessor";
    idOriginal == "btnProfessor" ? professor() : aluno();
};