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对象方法扩展

//1. Object.is 判断两个值是否完全相等 console.log(Object.is(120, 120));// === console.log(Object.is(NaN, NaN));// === console.log(NaN === NaN);// ===         //2. Object.assign 对象的合并const config1 = {    host: 'localhost',    port: 3306,    name: 'root',    pass: 'root',    test: 'test'};const config2 = {    host: 'http://atguigu.com',    port: 33060,    name: 'atguigu.com',    pass: 'iloveyou',    test2: 'test2'}console.log(Object.assign(config1, config2));//3. Object.setPrototypeOf 设置原型对象  Object.getPrototypeofconst school = {    name: 'study'}const cities = {    xiaoqu: ['北京','上海','深圳']}Object.setPrototypeOf(school, cities);console.log(Object.getPrototypeOf(school));console.log(school);

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