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Errata
JavaScript: The Definitive Guide, 4th Edition
By
David Flanagan
Publisher
: O'Reilly
Pub Date
: November 2001
ISBN
: 0-596-00048-0
Pages
: 936
Slots
: 1
This fourth edition of the definitive reference to
JavaScript, a scripting language that can be embedded
directly in web pages, covers the latest version of the
language, JavaScript 1.5, as supported by Netscape 6 and
Internet Explorer 6. The book also provides complete
coverage of the W3C DOM standard (Level 1 and Level 2),
while retaining material on the legacy Level 0 DOM for
backward compatibility.
Availability
JavaScript 1.3; JScript 3.0; ECMAScript v1
Synopsis
NaNDescription
NaN is global property that refers to the special
numeric not-a-number value. The NaN property is
not enumerated by for/in loops and cannot be
deleted with the delete operator. Note that
NaN is not a constant and can be set to any other
value, something that you should take care not to do.
To determine if a value is not a number, use isNaN(
), since NaN always compares non-equal
to any other value, including itself!
See Also
Infinity, isNaN( ), Number.NaN
