Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
La proprieta' arity ritornava il numero di parametri richiesta da una funzione. Ad ogni modo non esiste piu' ed e' stata rimpiazzata dalla proprieta' Function.prototype.length.
Specifiche
Implementato in JavaScript 1.2. Deprecato in JavaScript 1.4.
Compatibilita' Browser
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