JSFiddle - React, Tailwind, and code Playground

HTML

<button class="innerbox_contatos_search">GO!</button>

<div class="info-part">
    <a>Lúcio</a>
    <a>André</a>
    <a>Wallace</a>
    <a>Vitor</a>
</div>

CSS

a{
    display:block
    
}

JavaScript

$('.innerbox_contatos_search').click(function(){
    $('.info-part').find('a').addClass('ativo');

    $(".ativo").each(function() { 
      // this é o elemento atual do loop
      alert($(this).text())

  });
});