JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" class="select" id="1" />
<input type="checkbox" class="select" id="2" />
<button id="submit">Click</button>

JavaScript

$(function(){
    $('#submit').click(function(){
        $(".select:checked").each(function(){
           alert($(this).attr('id'));
        });
    });
});