HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>$.cachedScript() pattern</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    button { padding: 8px 14px; cursor: pointer; background: #7c3aed; color: #fff; border: none; border-radius: 6px; }
    .log { margin-top: 14px; padding: 12px; background: #f5f3ff; border-radius: 6px; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="load">Cached load dayjs</button>
  <div class="log" id="cached-result">$.getScript uses cache:false; cachedScript uses cache:true.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    jQuery.cachedScript = function(url, options) {
      options = $.extend(options || {}, { dataType: "script", cache: true, url: url });
      return jQuery.ajax(options);
    };
    $("#load").on("click", function() {
      $.cachedScript("https://cdn.jsdelivr.net/npm/dayjs/dayjs.min.js")
        .done(function(_script, textStatus) {
          $("#cached-result").text("Cached load: " + textStatus + " — today is " + dayjs().format("YYYY-MM-DD"));
        });
    });
  </script>
</body>
</html>

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jQuery.getScript() — $.cachedScript() pattern (Try It)