Object的原型克隆－create、assign、getPrototypeOf 方法的结合

         <script>
            /* 创建包含原型链的实验对象obj1－－ start */
            function inheritPrototype(subType, superType) {
                var prototype = Object(superType.prototype);
                prototype.constructor = subType;
                subType.prototype = prototype;
            }

            function SuperType(name) {
                this.name = name;
                this.colors = [‘red‘, ‘yellow‘, ‘black‘];
            }

            SuperType.prototype.sayName = function() {
                alert(this.name);
            }

            function SubType(name, age) {
                SuperType.call(this, name);
                this.age = age;
            }

            inheritPrototype(SubType, SuperType);

            SubType.prototype.sagAge = function() {
                alert(this.age);
            };

            var obj1 = new SubType(‘puppy‘, 12);
             /* 完成实验对象obj1的创建  －－end */
            
            /* 原型链克隆－－ start */
            var obj2 = Object.getPrototypeOf(obj1);
            var obj3 = Object.assign(Object.create(obj2), obj1);
            /* 原型链克隆－－ end */

            console.log(obj1);
            console.log(obj2);
            console.log(obj3);
        </script>

            function clone(origin) {
                return Object.assign({}, origin);
            }
 
            function moreClone(origin) {
                let oriProto = Object.getPrototypeOf(origin);
                return Object.assign(Object.create(oriProto), origin);
            }

            var obj = {};
            Object.defineProperty(obj, ‘test‘,  {
                configurable: false,
                enumerable: false,
                get() {
                    return this._value;
                },
                set(value) {
                    this._value = value + ‘ yeap‘;
                    return true;
                }
             });
            console.log(obj.property1) //undefined
            obj.test = 2
            console.log(obj.property1) // 2 yeap    

            Object.defineProperties(obj, {
                test1: {
                    configurable: false,
                    enumerable: false,
                    get() {
                       return this._value;
                    },
                    set(value) {
                        this._value = value + ‘ yeap‘;
                        return true;
                    }
                },
                test2: {
                    value: ‘cutcut’,
                    writable: true
                }
             });