ES8 Oject.values、Object.entries、Object.getOwnPropertyDescriptors

{
            //对象属性遍历
            let obj1 = { a: 1 }
            let obj2 = { b1: 2 }
            Object.defineProperty(obj2, "b2", {
                enumerable: false,
                value: 3
            })
            Object.setPrototypeOf(obj2, obj1)

            let c = Symbol('c')
            let d = Symbol('d')
            //给obj2添加symbol属性
            obj2[c] = 4
            obj2[d] = 5

            console.log(obj2)


            //遍历出对象自身可枚举的属性名(不包含Symbol属性)
            // for (let k of Object.keys(obj2)) {
            //     console.log("of1", k)
            // }

            //遍历出对象自身可枚举的属性值
            // for (let v of Object.values(obj2)) {
            //     console.log(v)
            // }

            //遍历出对象自身可枚举属性的键值对数组
            // for (let [k, v] of Object.entries(obj2)) {
            //     console.log(k, v)
            // }


            //getOwnPropertyDescriptor 获取一个对象自身属性的描述符
            //包含Symbol属性、不可枚举的属性

            //getOwnPropertyDescriptors
            //获取一个对象的所有自身属性的描述符

            //undefined
            //let ret = Object.getOwnPropertyDescriptor(obj2, "a")

            let ret = Object.getOwnPropertyDescriptor(obj2, c)
            //let ret = Object.getOwnPropertyDescriptor(obj2, "b1")
            //let ret = Object.getOwnPropertyDescriptor(obj2, "b2")
            console.log(ret)

            console.log(Object.getOwnPropertyDescriptors(obj2))



        }