In ES6 Object.assign () and the Object.create ()

Object.assign()

Syntax: Object.assing (target, ... sources)

A combined target

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

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

II clone

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

Three, " null or undefined source is considered null object treated the same, will not have any impact on the target audience."

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

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

can be seen from the above, test1 and test4 still empty object

Reproduced in: https: //www.cnblogs.com/yangxuan/p/11076199.html