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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>$.getScript() lodash</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 560px; }
    button { padding: 8px 14px; cursor: pointer; background: #16a34a; color: #fff; border: none; border-radius: 6px; }
    .log { margin-top: 14px; padding: 12px; background: #f0fdf4; border-radius: 6px; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="load">Load lodash</button>
  <div class="log" id="lib-info">Script runs in global context — _ appears after load.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#load").on("click", function() {
      $.getScript("https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js", function() {
        var doubled = _.map([1, 2, 3], function(n) { return n * 2; });
        $("#lib-info").html("<strong>lodash</strong> v" + _.VERSION + " — _.map([1,2,3]) → [" + doubled.join(", ") + "]");
      });
    });
  </script>
</body>
</html>

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jQuery.getScript() — load lodash global (Try It)