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JavaScript Function Reference

The top-level properties and functions can be used on all of the built-in JavaScript objects.

Top-level Functions

FF: Firefox, N: Netscape, IE: Internet Explorer

Function	Description	FF	N	IE
decodeURI()	Decodes an encoded URI	1	4	5.5
decodeURIComponent()	Decodes an encoded URI component	1	4	5.5
encodeURI()	Encodes a string as a URI	1	4	5.5
encodeURIComponent()	Encodes a string as a URI component	1	4	5.5
escape()	Encodes a string	1	-	3
eval()	Evaluates a string and executes it as if it was script code	1	2	3
isFinite()	Checks if a value is a finite number	1	4	4
isNaN()	Checks if a value is not a number	1	2	3
Number()	Converts an object's value to a number	1
parseFloat()	Parses a string and returns a floating point number	1	2	3
parseInt()	Parses a string and returns an integer	1	2	3
String()	Converts an object's value to a string	1
unescape()	Decodes a string encoded by escape()	1	-	3

Top-level Properties

Property	Description	FF	N	IE
Infinity	A numeric value that represents positive or negative infinity	1	4	4
NaN	Indicates that a value is "Not a Number"	1	4	4
undefined	Indicates that a variable has not been assigned a value	1	4	5.5

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