Integers can also be represented as either octal (base 8) or hexadecimal (base 16) literals. : Integer « Number Data Type « JavaScript Tutorial

For an octal literal, the first digit must be a zero (0).

The following digits can be any octal digit (0 through 7).

var iNum = 070;

5.3.Integer
	5.3.1.	Integers
	5.3.2.	Integers can also be represented as either octal (base 8) or hexadecimal (base 16) literals.
	5.3.3.	To create a hexadecimal literal, the first digit must be a zero (0) followed by the letter x, followed by any number of hexadecimal digits (0-9 and A-F).
	5.3.4.	Define and use integers
	5.3.5.	Calculation on integers
	5.3.6.	Compare two numbers
	5.3.7.	Generate random number
	5.3.8.	Using Binary Flags