This feature is obsolete. Although it is still supported by browsers, its usage is discouraged in new projects. Try to avoid using it.
Prevent modification of object fields.
As of SpiderMonkey 1.8.5,
JS_SealObject has been removed from the JSAPI, because ECMAScript 5 includes a "seal" concept (namely, that of
Object.seal) which is quite different from that of
JS_SealObject's exact semantics are subtly incompatible with ECMAScript.
JS_DeepFreezeObject are near-substitutes compatible with ECMAScript semantics, implementing semantics compatible with those of
| || ||A context.|
| || ||The object to seal.|
| || ||If true, seal all objects directly or indirectly reachable from obj's slots.|
JS_SealObject prevents all write access to the object, either to add a new property, delete an existing property, or set the value or attributes of an existing property.