ES6对象的扩展方法

　　　// Object.is 判断两个值是否完全相等

            console.log(Object.is(120, 120)) // true 和===很像

            // 区别

            console.log(Object.is(NaN, NaN))

            console.log(NaN === NaN)

            // Object.assign 对象的合并

            const config1 = {

                host: 'localhost',

                port: 8080,

                name: 'root',

                pass: 'root',

                test: 'test'

            }

            const config2 = {

                host: 'https:www.wn.com',

                port: 3308,

                name: 'wcan',

                pass: 'iloveyou'

            }

            console.log(Object.assign(config1, config2)) // 相同的属性，后面的会覆盖前面的

            // Object.setPrototypeOf 设置原型对象 Object.getPrototypeOf 获取原型对象

            const school = {

                name: '微能'

            }

            const cities = {

                xiaoqu: ['上海', '北京', '深圳']

            }

            Object.setPrototypeOf(school, cities)

            console.log(Object.getPrototypeOf(school))

            console.log(school)