April 2007
Intermediate to advanced
1100 pages
62h 31m
German
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Name
Number.NaN — Der Spezialwert Not-a-NumberECMAScript v1
Überblick
Number.NaN
Beschreibung
Number.NaN ist ein Spezialwert, der
anzeigt, dass das Ergebnis einer mathematischen Operation (z.B.
Quadratwurzel aus einer negativen Zahl) keine Zahl ist. Die Methoden
parseInt( ) und parseFloat( )
geben diesen Wert zurück, wenn sie den angegebenen String nicht
parsen können. Sie können Number.NaN in ähnlicher
Weise verwenden, um eine Fehlerbedingung für eine Funktion
anzuzeigen, die normalerweise eine gültige Zahl zurückgibt.
JavaScript gibt den Wert Number.NaN als
NaN aus. Beachten Sie, dass der Wert
NaN ungleich jeder anderen Zahl einschließlich
seiner selbst ist. Sie können also nicht durch Vergleichen von
Number.NaN das Vorhandensein eines NaN-Werts ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.