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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div id="botones">
    <button class="btn">boton 1</button>
    <button class="btn">boton 2</button>
    <button class="btn">boton 3</button>
    <button class="btn">boton 4</button>
  </div>
  <div id="log"></div>
  <script>
    let botones = document.querySelectorAll('.btn');
    let index = 1;
    for (let boton of botones) {
      let mensaje = `Click en el botón: ${index}`;
      boton.addEventListener('click', () => alert(mensaje));
      index++;
    }
  </script>
</body>
</html>
Output 300px

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anonymouspro
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