JavaScript Global Reference


The JavaScript global properties and functions can be used with all the built-in JavaScript objects.


JavaScript Global Properties

Property Description
Infinity A numeric value that represents positive/negative infinity
NaN "Not-a-Number" value
undefined Indicates that a variable has not been assigned a value

JavaScript Global Functions

Function Description
decodeURI() Decodes a URI
decodeURIComponent() Decodes a URI component
encodeURI() Encodes a URI
encodeURIComponent() Encodes a URI component
escape() Deprecated in version 1.5. Use encodeURI() or encodeURIComponent() instead
eval() Evaluates a string and executes it as if it was script code
isFinite() Determines whether a value is a finite, legal number
isNaN() Determines whether a value is an illegal number
Number() Converts an object's value to a number
parseFloat() Parses a string and returns a floating point number
parseInt() Parses a string and returns an integer
String() Converts an object's value to a string
unescape() Deprecated in version 1.5. Use decodeURI() or decodeURIComponent() instead



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