JS::IdentifyStandardInstance 编辑

This article covers features introduced in SpiderMonkey 31

Determine if the given object is an instance/prototype/constructor for a standard class.

Syntax

JSProtoKey
JS::IdentifyStandardInstance(JSObject *obj);

JSProtoKey
JS::IdentifyStandardPrototype(JSObject *obj);

JSProtoKey
JS::IdentifyStandardInstanceOrPrototype(JSObject *obj);

JSProtoKey
JS::IdentifyStandardConstructor(JSObject *obj); // Added in SpiderMonkey 38

Description

JS::IdentifyStandardInstance determines if the given object is an instance for a standard class. If so, return the associated JSProtoKey. If not, return JSProto_Null.

JS::IdentifyStandardPrototype determines if the given object is a prototype for a standard class. If so, return the associated JSProtoKey. If not, return JSProto_Null.

JS::IdentifyStandardInstanceOrPrototype determines if the given object is an instance or prototype for a standard class. If so, return the associated JSProtoKey. If not, return JSProto_Null.

JS::IdentifyStandardConstructor determines if the given object is a constructor for a standard class. If so, return the associated JSProtoKey. If not, return JSProto_Null.

See Also

• MXR ID Search for JS::IdentifyStandardInstance
• MXR ID Search for JS::IdentifyStandardPrototype
• MXR ID Search for JS::IdentifyStandardInstanceOrPrototype
• MXR ID Search for JS::IdentifyStandardConstructor
• JSProtoKey
• bug 975277
• bug 976148 - added IdentifyStandardConstructor