Edit in JSFiddle

var pObj1 = {
  a: 2,
};
var obj1 = Object.create(pObj1);
document.writeln(obj1.a);
document.writeln(obj1.hasOwnProperty('a'));
document.writeln('</br>');
obj1.a = 4;
console.log(obj1);
document.writeln(obj1.a);
document.writeln(obj1.hasOwnProperty('a'));