SOURCE

let obj = {
  name: "秦始皇",
  age: 5000
}
let obj1 = {
  ...obj,
  address: "陕西县"
}
console.log(obj1.name);
obj.name = "嬴政";
console.log(obj1.name);

let user = {
    name: ["李世民", "李渊", "李建成"],
    address: "西安"
}
let user2 = {
    ...user,
    caodai: "唐"
}
console.log(user2.name[0]);
user.name[0] = "李元霸";
console.log(user2.name[0]);

// 结论：展开运算符（...）对于多维的对象并不能实现深拷贝。