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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>globalEval — scope</title>

</head>

<body>

  <pre id="out"></pre>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    (function () {

      function demo() {

        $.globalEval("var fromGlobalEval = 'global';");

        eval("var fromEval = 'local';");

      }

      demo();

      document.getElementById("out").textContent = [

        "fromGlobalEval global: " + (typeof fromGlobalEval !== "undefined"),

        "fromEval global: " + (typeof fromEval !== "undefined")

      ].join("\n");

    })();

  </script>

</body>

</html>

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jQuery.globalEval() — vs eval() (Try It)