HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .each() index width</title>
  <style>
    .bar { height: 24px; background: #4a90d9; margin: 6px 0; }
  </style>
</head>
<body>
  <div class="bar"></div>
  <div class="bar"></div>
  <div class="bar"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(".bar").each(function (index) {
      $(this).css("width", (index + 1) * 40 + "px");
    });
  </script>
</body>
</html>

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jQuery .each() — index-based width (Try It)