JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option value="1" selected>repa</option>
    <option value="2">retek</option>
    <option value="3">mogyoro</option>
    <option value="4">rigo</option>
</select>
<button>clicky-clicky</button>

JavaScript

$(function(){
    $('button').click(function(){
        var $select = $('select'),
            originalSelection = $select.find('[selected]').val(),
            currentSelection = $select.find(':selected').val();
        alert('original: ' + originalSelection + ', selected: ' + currentSelection);
    });
});