JavaScript Reserved Words

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The following are reserved words in JavaScript. These words MUST NOT be used in a script as JavaScript has reserved these words for use within the JavaScript internal structure. They cannot be used as JavaScript variables, functions, methods, loop labels, or object names. Unanticipated results will probably occur and cause unknown errors. The last selection is a compilation of general script protected and reserved words you should also avoid in your scripts. Updated 9/2009

JavaScript Reserved Words
break	continue	do	for	import	new	this	void
case	default	else	function	in	return	typeof	while
comment	delete	export	if	label	switch	var	with

Java Keywords (Reserved by JavaScript)
abstract	implements	protected
boolean	instanceOf	public
byte	int	short
char	interface	static
double	long	synchronized
false	native	throws
final	null	transient
float	package	true
goto	private

ECMAScipt Reserved Words
catch	enum	throw
class	extends	try
const	finally
debugger	super

Other JavaScript Keywords
alert	eval	Link	outerHeight	scrollTo
Anchor	FileUpload	location	outerWidth	Select
Area	find	Location	Packages	self
arguments	focus	locationbar	pageXoffset	setInterval
Array	Form	Math	pageYoffset	setTimeout
assign	Frame	menubar	parent	status
blur	frames	MimeType	parseFloat	statusbar
Boolean	Function	moveBy	parseInt	stop
Button	getClass	moveTo	Password	String
callee	Hidden	name	personalbar	Submit
caller	history	NaN	Plugin	sun
captureEvents	History	navigate	print	taint
Checkbox	home	navigator	prompt	Text
clearInterval	Image	Navigator	prototype	Textarea
clearTimeout	Infinity	netscape	Radio	toolbar
close	innerHeight	Number	ref	top
closed	innerWidth	Object	RegExp	toString
confirm	isFinite	onBlur	releaseEvents	unescape
constructor	isNan	onError	Reset	untaint
Date	java	onFocus	resizeBy	unwatch
defaultStatus	JavaArray	onLoad	resizeTo	valueOf
document	JavaClass	onUnload	routeEvent	watch
Document	JavaObject	open	scroll	window
Element	JavaPackage	opener	scrollbars	Window
escape	length	Option	scrollBy

General Script Protected Words In Browsers
abstract boolean break byte case catch char class const continue debugger default delete do double	else enum export extends false final finally float for function goto if implements import in	instanceof int interface long native new null package private protected public return short static super	switch synchronized this throw throws transient true try typeof var void volatile while with

JavaScript Reserved Words

Be careful NOT to use these words as JavaScript variables, functions, methods, loop labels, or object names. There is no need to view the source.

JavaScript Reserved Words

Java Keywords (Reserved by JavaScript)

ECMAScipt Reserved Words

Other JavaScript Keywords

General Script Protected Words In Browsers