JSFiddle - React, Tailwind, and code Playground

by robotas

HTML

<select name="list-one" id="list">
  <option value="10">Свыше 200 штук</option>
  <option value="25">Свыше 500 штук</option>
  <option value="50">Свыше 1000 штук</option>
</select>
<button onclick="myFunction()">Рассчитать</button>
<div class="demo">Тест</div>
<script>
function myFunction() {
		alert("go");
    var x = document.getElementById("list");
    var val = x.options[x.selectedIndex].value;
    document.getElementById("demo").innerHTML = val;
}
</script>