Samplejs8.html

<html>
<head>
  <title>Book Identifier</title>
</head>
<body>
  <script type="text/javascript">
     var book;
     book = prompt("Enter a book name", "Null");
     if (book === "history") {
         document.write("<b>History Book</b>");
     } else if (book === "maths") {
         document.write("<b>Maths Book</b>");
     } else if (book === "economics") {
         document.write("<b>Economics Book</b>");
     } else {
         document.write("<b>Unknown Book</b>");
     }
  </script>
</body>
</html>