This article is in need of a technical review.
Obsolete since JSAPI 13
This feature is obsolete.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.
This article covers features introduced in SpiderMonkey 6
void * JS_GetExternalStringClosure(JSContext *cx, JSString *str);
||The context from which to retrieve the closure for a string. Requires request. In a
||The string for which to return the closure. The result is NULL if the external string was created without one (that is, by calling
To determine if a string was created as an external string, you can call