Simple Function to get inherited prototype Object members

inheritedMembers.js

// for ES5 compliant engines (tested in Chrome, FF and IE9+)
// Under WTFPL license ;)
function getObjectInheritedMembers(obj) {
  var members = {};
   if (['boolean', 'number', 'string', 'undefined'].indexOf(typeof obj) !== -1 || obj === null) { // support for primitives types
    obj = Object(obj);
  } else if (typeof obj === 'function') {
    members[obj.name || (obj.toString().match(/function (\w*)/) || obj.toString().match(/\[object (\w*)\]/))[1] || 'Anonymous Function'] = Object.getOwnPropertyNames(obj);
    obj = obj.prototype;  
  } else if (obj.toString() !== '[object Object]' && obj.prototype) { // fix Objects instances and IE 
     members[obj.prototype.constructor.name || (obj.prototype.constructor.toString().match(/function (\w*)/) || obj.prototype.constructor.toString().match(/\[object (\w*)\]/))[1] || 'Anonymous Function'] = Object.getOwnPropertyNames(obj);
     obj = obj.prototype; 
  } else if (!Object.getPrototypeOf(obj) && obj.constructor) {
     members[(obj.constructor.name || (obj.constructor.toString().match(/function (\w*)/) || obj.constructor.toString().match(/\[object (\w*)\]/))[1] || 'Anonymous Function')] = Object.getOwnPropertyNames(obj);
  }
  while (obj = Object.getPrototypeOf(obj)) {
    if (obj && obj.constructor) {
      members[(obj.constructor.name || (obj.constructor.toString().match(/function (\w*)/) || obj.constructor.toString().match(/\[object (\w*)\]/) || [0, 'Anonymous Function'])[1])] =  Object.getOwnPropertyNames(obj);
    }
  }
  return members;
}

// test
getObjectInheritedMembers(HTMLDivElement);