Converts a string to an integer.
Required. A string to convert into a number.
Optional. A value between 2 and 36 that specifies the base of the number in
numString. If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal. All other strings are considered decimal.
parseInt function returns an integer value equal to the number contained in
numString. If no prefix of
numString can be successfully parsed into an integer,
NaN (not a number) is returned.
parseInt("abc"); // Returns NaN. parseInt("12abc"); // Returns 12.
You can test for
NaN using the
Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.
Applies To: Global Object
Starting in Internet Explorer 9 standards mode, the
parseInt function does not treat a string that has a prefix of '0' as an octal. When you are not using the
parseInt function, however, strings with a prefix of '0' can still be interpreted as octals. See Data Types for information about octal integers.