JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="campo1" id="c1" />
<input type="text" name="campo2" id="c2" />
<button type="button">Enviar</button>

JavaScript

$(document).ready(function(){
    $('button').click(function(){
        alert('campo1 ='+
              encodeURIComponent($('#c1').val())
              +'&campo2='+
              encodeURIComponent($('#c2').val()));
    });
    
});