BuatInterfaceTextBoxdanButtontoAlert

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Vadlan Ramdani-XIRPL3</title>
    <link rel="stylesheet" href=".css" type="text/css"></link>
  </head>
  <body>
    <p id="coba">
      <input type="text" id="nilai" />
      <input type="button" id="btnAmbilNilai" value="Ambil Nilai" onclick="AmbilNilai();" />
      <script type="text/javascript" language="javascript">
        function AmbilNilai()
        {
          var objNilai = document.getElementById('nilai');
          var n = objNilai.value;
          alert("Nilainya Adalah " + n);
        }
      </script>
    </p>
  </body>
</html>