Objects
First, let’s think about objects. An object is some kind of a thing. A cat, a computer, and a bicycle are all objects (Figure 1.5) in the physical world. To JavaScript, there are objects it deals with in Web browsers, such as windows and forms, and the elements of the form, such as buttons and check boxes (Figure 1.6).
Figure 1.5. The cat object (this one’s name is Pixel).
Figure 1.6. The buttons and check box are browser objects, which can be manipulated by JavaScript.
Because you can have more than one cat, or more than one window, ...
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