<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>049</title>
</head>
<body>
</body>
<script type="text/javascript">
(function () {
function Book (title, author){
this.getTitle = function(){
return "Title: " + title;
};
this.getAuthor = function(){
return "Author: " + author;
};
this.replaceTitle = function(newTitle){
var ordTitle = title;
title = newTitle;
};
this.replaceAuthor = function(newAuthor){
var oldAuthor = author;
author = newAuthor;
};
}
function TechBook(title, author, category){
this.getCategory = function(){
return "Technical Category: " + category;
};
Book.apply(this, arguments);
this.changeAuthor = function(newAuthor){
this.replaceAuthor(newAuthor);
return this;
};
}
var newBook = new TechBook("I Know Things", "Smart Author", "tech");
console.log(newBook.changeAuthor("Book k. Reader").getAuthor());
})();
</script>
</html>
