HTML and CSS Reference
In-Depth Information
EXPLANATION
1
The
book
constructor function is defined with its properties.
2
The
book
object is described with three properties:
title
,
author
, and
publisher
.
3
The
book
object's property is assigned the name of a function. This property will
serve as a method for the object.
4
A function called
show
is defined.
5
The
with
keyword will allow you to reference the properties of the object without
using the name of the object and the dot or the
this
keyword. (See “The Math Ob-
ject” on page 241 in Chapter 9.)
6
A variable called
info
is assigned the property values of a
book
object. The
with
keyword allows you to specify the property name without a reference to the object
(and dot) preceding it.
7
The
alert
box displays the properties for a book object.
8
The constructor function is called and returns an instance of a new book object
called
childbook
.
9
The constructor function is called and returns an instance of another book object
called
adultbook
.
10
The
show()
method is called for the
childbook
object (see Figure 8.10).
11
The
show()
method is called for the
adultbook
object (see Figure 8.11).
Figure 8.10
The
childbook
object and its properties.
