enumerate property in Object&Class from JavaScript

gistfile1.js

function TestProp () {
  var p1 = 'abc';
  var priFunc = function() {
    console.log('Im private function');
  }
  this.privilegeFunc = function () {
    console.log('Im priviledge function');
  }
  this.pubProp = "Public property";
}

TestProp.prototype.PubFunction = function () {
  console.log("I'm public function/method");
}

TestProp.prototype.ProtoProperty = "Prototype Property";
TestProp.classProperty = "Static Class Property";

(function (){
  console.log('Class Property is ' + Object.keys(TestProp));
  console.log('Object Property is ' + Object.keys(new TestProp()));
  console.log('try another method to list property');
  var test = new TestProp();
  var arr1 = [];
  for (var i in test) {
    arr1.push(i);
  }
  console.log(arr1.join('\n'));
})();

output is :
Class Property is classProperty
Object Property is privilegeFunc,pubProp
try another method to list property
privilegeFunc
pubProp
PubFunction
ProtoProperty