HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>prompt() — name</title>
</head>
<body>
  <button type="button" id="askBtn">Ask for name</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("askBtn").onclick = function () {
      var userName = prompt("Please enter your name:", "Guest");
      var out = document.getElementById("out");
      if (userName === null) {
        out.textContent = "User canceled the prompt.";
      } else {
        out.textContent = "Hello, " + userName + "!";
      }
    };
  </script>
</body>
</html>

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JavaScript prompt() — ask for name (Try It)