inspect inherited properties of an object

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ASP

Javascript

how inspect the properties of an object where inherited to object?i can't use of Object.keys and Object.getOwnPropertyNames !

Object.keys:This method returns an array of all enumerable property names defined by a given object (inherited properties are not considered)

Object.getOwnPropertyNames:similar to Object.keys(obj) but additionally returns the names of non-enumerable properties (again, inherited properties are not included).

var f = new Object();
        f.l = 8;

        Object.prototype.s = 9;

        Object.defineProperty(Object.prototype, "constvar", {
            enumerable: false,
            value: 88
        });

        var g1 = Object.keys(Object);
        var gg1 = Object.getOwnPropertyNames(Object); //don't contain 'constvar' where is not enumerable but exist s property where is enumerable