JSFiddle - React, Tailwind, and code Playground

by Kolichikov

HTML

<select id="myselect">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select> 
<div id="mydiv">

</div>

JavaScript

var count = 0;

$("#myselect").change(function(){
  var sel = $("#myselect");
  var index = sel[0].selectedIndex;
  var children = sel.children("option");
  var item = $($("#myselect").children("option")[3]);
  item.html(item.html() + count++);
	$("#mydiv").html(sel.val());
});