JSFiddle - React, Tailwind, and code Playground

HTML

<select name="test" id="test">
    <option value="php">php</option>
    <option value="js">js</option>
    <option value="c++">c++</option>
</select>
<p>Вы выбрали: <span id="result"></span></p>

JavaScript

(function ($) {
    var result = $('#result');
    $('#test').change(function () {
        result.text($(this).val());
    });
})(jQuery);