implement ES5-style Object.create

Object.create.js

(function(){

    if (typeof Object.create != 'function') {
        Object.create = function(proto, propertiesObject) {
            var pType = typeof propertiesObject;
            if (pType == 'string' || pType == 'boolean' || pType == 'number') {
                throw new TypeError('The second parameter to Object.create must be undefined or an object.');
            }
            var Constructor = function() {};
            Constrcutor.prototype = proto;
            var newObject = new Constructor();
            if (propertiesObject) {
                for (key in propertiesObject) {
                    if (propertiesObject.hasOwnProperty(key)) {
                        newObject[key] = propertiesObject[key];
                    }
                }
            }
            return newObject;
        };
    }

})();