JSFiddle - React, Tailwind, and code Playground

HTML

<button id="bt">Click</button>

JavaScript

func_a = function(arg1) {
    alert('call a '+ arg1);
};
func_b = function() {
    alert('call b');
};
func_c = function() {
    alert('call c');
};


var bt = document.getElementById('bt');
var n = "a";                             
bt.addEventListener("click",function(){

    
    window["func_" + n]('arg1');
    (n == 'a' || n=='c')?n = 'b':n = 'c';
    
});