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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setTimeout() — args</title>
</head>
<body>
  <h1>Extra arguments</h1>
  <p><button type="button" id="go">Greet after 1s</button></p>
  <pre id="out">Click the button</pre>
  <script>
    (function () {
      var out = document.getElementById("out");
      function greet(name) {
        out.textContent = "Hello, " + name;
      }
      document.getElementById("go").onclick = function () {
        out.textContent = "Waiting…";
        setTimeout(greet, 1000, "Alex");
      };
    })();
  </script>
</body>
</html>

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JavaScript setTimeout() — extra args (Try It)