JSFiddle - React, Tailwind, and code Playground

HTML

<form action="" id="onepagecheckout_orderform">
    <input type="text" id="billing:firstname" name="billing[firstname]" value="" title="First Name" class="t1 required-entry"/>
    <input type="text" id="billing:lastname" name="billing[lastname]" value="" title="Last Name" class="t1 required-entry"/>
    <br/>
    <input type="checkbox" class="" name="shipping[clone]" id="shippingClone" title="Clone"/>
    <label for="shippingClone">Ship to same address</label>
</form>

JavaScript

$(document).ready(function(){
                function cloneMe(){
                    $("#onepagecheckout_orderform input:text").each(function() {
                        alert($(this).attr("name"));
                    });
                    return false;
                };
                $('#shippingClone').on('click', function () {
                    cloneMe();
                });
            });