ES6中Object.assign()

Object.assign()

語法：Object.assing(target,…sources)

一、合並對象

const first = { name: "Bob" };
const last = { lastName: "Smith" };

let person = Object.assign(first, last);
console.log(person);/*{ name: 'Bob', lastName: 'Smith' }*/

二、克隆對象

const obj = { person: "Bob Smith"};
const clone = Object.assign({}, obj);
console.log(obj);/*{ person: 'Bob Smith' }*/

三、"null 或 undefined 源被視為空對象一樣對待，不會對目標對象產生任何影響。"

const test = null;
const test1 = Object.assign({},test);
console.log(test1);/*{}*/

const test2=undefined;
const test4=Object.assign({},test2);
console.log(test4);/*{}*/

通過以上可以看出，test1和test4依然空對象