MSDN Library

isFinite Function (JavaScript)

Returns a Boolean value that indicates if a supplied number is finite.


The required number argument is any numeric value.

The isFinite function returns true if number is any value other than NaN, negative infinity, or positive infinity. In those three cases, it returns false.

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards. See Version Information.

Applies To: Global Object (JavaScript)

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