JSFiddle - React, Tailwind, and code Playground

HTML

<input type="radio" class="radio1" name="radio1" value="1"> 1 <BR/>
<input type="radio" class="radio1" name="radio1" value="2"> 2 <BR/>
<input type="radio" class="radio1" name="radio1" value="3"> 3 <BR/>
<input type="radio" class="radio1" name="radio1" value="4"> 4 <BR/>
<input type="radio" class="radio1" name="radio1" value="5"> 5 <BR/>

JavaScript

var teste = {
        testando: function(element){
            $(element).on("click",function(){
    
                var valor = $(element + ":checked").val();
                this.uai(valor);
                    	alert();

            });
    
            if(($(element)).is(":checked")) {
                var valor = $(element + ":checked").val();
                this.uai(valor);
            }
        },
        uai : function(valor){

         //faz algo com o valor
            
        }
    };
    
	  $(document).ready(function(){
    	  $(".radio1").get("2").checked = true;
        teste.testando("[name='radio1']");
    });