ES6-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));// ===  true
console.log(Object.is(NaN, NaN));// === true
console.log(NaN === NaN);// false

2. Object.assign 对象的合并

   const config1 = {
            host: 'localhost',
            port: 3306,
            name: 'root',
            pass: 'root',
            test: 'test'
        };
        const config2 = {
            host: 'http://baidu.com',
            port: 33060,
            name: 'atguigu.com',
            pass: 'iloveyou',
            test2: 'test2'
        }
        console.log(Object.assign(config1, config2));

后面的会覆盖前面的

3. Object.setPrototypeOf 设置原型对象 Object.getPrototypeof

const school = {
            name: 'lili'
        }
        const cities = {
            xiaoqu: ['北京','上海','深圳']
        }
        Object.setPrototypeOf(school, cities);
        console.log(Object.getPrototypeOf(school));
        console.log(school);