parseInt() in radix mode : Type Conversion « Number Data Type « JavaScript Tutorial

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2. Number Data Type
3. Type Conversion

The parseInt() method also has a radix mode, allowing you to convert strings in binary, octal, hexadecimal, or any other base into an integer.

The radix is specified as a second argument to parseInt().

var iNum1 = parseInt("AF", 16);
var iNum1 = parseInt("10", 2);
var iNum2 = parseInt("10", 8);
var iNum2 = parseInt("10", 10);