Object.assign()

Object.assign()用于将所有可枚举属性的值从一个或多个源对象拷贝到目标对象

const source = { b: 4, c: 5 };

const returnedTarget = Object.assign(target, source);

console.log(target);
// expected output: Object { a: 1, b: 4, c: 5 }

console.log(returnedTarget);
// expected output: Object { a: 1, b: 4, c: 5 }

用法:

Object.assign(target,...source)