Beginning JavaScript®, Fourth Edition

Appendix B. JavaScript Core Reference

This appendix outlines the syntax of all the JavaScript core language functions and objects with their properties and methods. If changes have occurred between versions, they have been noted.

Browser Reference

The following table outlines which JavaScript version is in use and in which browser it is used. Note that Internet Explorer implements Jscript, Microsoft's version of JavaScript. However, Jscript's features are relatively the same as JavaScript.

JavaScript Version	Netscape Navigator	Mozilla Firefox	Internet Explorer	Safari / Chrome	Opera
1.0	2.x		3.0
1.1	3.x
1.2	4.0–4.05
1.3	4.06–4.7x		4.0
1.4	5.0
1.5	6.x	1.0	5.5, 6, 7, 8	3.0, 3.1	6, 7, 8, 9
1.6	6.2	1.5		3.2, 4.0	1.0
1.7		2.0
1.8		3.0
1.8.1		3.5

Reserved Words

Various words and symbols are reserved by JavaScript. These words cannot be used as variable names, nor can the symbols be used within them. They are listed in the following table.

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
-	!	~
%	/	*
>	<	=
&	^	|
+	?

Other Identifiers to Avoid

It is best to avoid the use of the following identifiers as variable names.

JavaScript 1.0

abs acos anchor asin atan atan2 big blink bold ceil charAt comment cos Date E escape eval exp fixed floor fontcolor ...