我正在尝试使用解构赋值提取 object 的值，年龄变量表示未定义。 我做错了什么？

Question

 const obj = { firstUser: { name: { firstName: 'John', lastName: 'Doe', }, age: 32, } } const { firstUser: { name: { lastName: Lname } }, age } = obj; console.log(Lname); console.log(age);

Answer 1

Try this way:

const { firstUser } = obj;
const { name, age } = firstUser;
const { lastName: Lname } = name; // this is destructuring assignment

Now you can use lastName as Lname variable.

Answer 2

Because you have placed the age field inside firstName object,nested inside the obj. I have refactored your code

 const obj = { firstUser: { name: { firstName: 'John', lastName: 'Doe', }, }, age: 32, } const {firstUser:{name: {lastName: Lname}}, age} = obj; console.log(Lname); console.log(age);