18.对象方法的扩展

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