HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>$.getScript() error handling</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 560px; }
    button { margin-right: 8px; padding: 8px 14px; cursor: pointer; border: none; border-radius: 6px; color: #fff; }
    #ok { background: #16a34a; }
    #bad { background: #dc2626; }
    .log { margin-top: 14px; padding: 12px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="ok">Load dayjs (valid)</button>
  <button type="button" id="bad">Load fake URL</button>
  <div class="log" id="status">Try both buttons.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function loadPlugin(url) {
      return $.getScript(url)
        .done(function(_script, textStatus, jqXHR) {
          $("#status").text("Loaded (HTTP " + jqXHR.status + ")").css("color", "green");
        })
        .fail(function(jqXHR, textStatus, errorThrown) {
          $("#status").text("Failed: " + textStatus + " — " + errorThrown + " (HTTP " + jqXHR.status + ")").css("color", "red");
        });
    }
    $("#ok").on("click", function() { loadPlugin("https://cdn.jsdelivr.net/npm/dayjs/dayjs.min.js"); });
    $("#bad").on("click", function() { loadPlugin("https://cdn.jsdelivr.net/npm/this-library-does-not-exist-xyz/plugin.min.js"); });
  </script>
</body>
</html>

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jQuery.getScript() — done/fail error handling (Try It)