JavaScript: The Definitive Guide, Fourth Edition

Name

Global — the global object

Availability

JavaScript 1.0; JScript 1.0; ECMAScript v1

Synopsis

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Global Properties

The global object is not a class, so the following global properties have individual reference entries under their own name. That is, you can find details on the undefined property listed under the name “undefined,” not under “Global.undefined.” Note that all top-level variables are also properties of the global object.

Infinity

A numeric value that represents positive infinity.

NaN

The not-a-number value.

undefined

The undefined value.

Global Functions

The global object is an object, not a class. The global functions listed below are not methods of any object, and their reference entries appear under the function name. For example, you’ll find details on the parseInt( ) function under “parseInt( ),” not “Global.parseInt( ).”

decodeURI( )

Decodes a string escaped with encodeURI( ).

decodeURIComponent( )

Decodes a string escaped with encodeURIComponent( ).

encodeURI

Encodes a URI by escaping certain characters.

encodeURIComponent

Encodes a URI component by escaping certain characters.

escape( )

Encodes a string by replacing certain characters with escape sequences.

eval( )

Evaluates a string of JavaScript code and return the result.

isFinite( )

Tests whether a value is a finite number.

isNaN

Tests whether a value is the not-a-number value.

parseFloat( )

Parses a number from a string.

parseInt( )

Parses an integer from a string.

unescape( )

Decodes a string encoded ...