JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
  <style>
  span.deneme{ text-decoration:line-through; }
  </style>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
  <div>
    <span id="1">Ali,</span>
    <span id="2">Ahmet,</span>
    <span id="3">Mehmet,</span>
    <span id="4">Samet</span>
  </div>
  <div>
    <span id="5">Ali,</span>
    <span id="6">Ahmet,</span>
    <span id="7">Mehmet,</span>
    <span id="8">Samet</span>
  </div>

JavaScript

alert($("div span:last-child").attr("id"));