JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<button id="btn">
Valor
</button>
<button id="btnSetar">
Setar
</button>

JavaScript

var nome_da_tela = {
	init: function(){
  	this.varUm = null;
    var thisLocal = this; 
    
    $("#btn").click(function(){
      alert(thisLocal.varUm);
    });

    $("#btnSetar").click(function(){
      thisLocal.SetarValor();
    });
  },
  SetarValor:function(){
  	var thisLocal = this
  	$.get('/echo/json/',{},function(data){
    	thisLocal.varUm = data
    });
  }
}

$(document).ready(function(){
	nome_da_tela.init();
});