object.hasOwnProperty(name)

 1 if (typeof Object.beget !== 'function') {
 2     Object.beget = function(o) {
 3         var F = function() {};
 4         F.prototype = o;
 5         return new F();
 6     };
 7 }
 8 
 9 var a = {
10     member: true
11 };
12 var b = Object.beget(a);
13 var t = a.hasOwnProperty('member');
14 var u = b.hasOwnProperty('member');
15 var v = b.member;
16 
17 console.log(t);
18 console.log(u);
19 console.log(v);