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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>undelegate by ref demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 480px; }
    p { padding: 10px; background: #dcfce7; border-radius: 6px; cursor: pointer; }
    button { margin-top: 10px; padding: 8px 14px; cursor: pointer; }
    #log { margin-top: 12px; color: #374151; font-weight: 600; }
  </style>
</head>
<body>
  <p>Click me — two delegated handlers on body</p>
  <button type="button" id="remove-foo">body.undelegate("p", "click", foo)</button>
  <div id="log">Both handlers log on p click until foo is removed.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var foo = function() { $("#log").append(" [foo]"); };
    var bar = function() { $("#log").append(" [bar]"); };
    $("body").delegate("p", "click", foo);
    $("body").delegate("p", "click", bar);
    $("#remove-foo").on("click", function() {
      $("body").undelegate("p", "click", foo);
      $("#log").text("foo removed. Click p — only [bar] appears.");
    });
  </script>
</body>
</html>

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jQuery .undelegate('p', 'click', foo) — by handler ref (Try It)