单选题

以下输出错误的是

Question

A. let a = {
age: 1
}
let b = a
a.age = 2
console.log(b.age) // 2

B. let a = {
age: 1
}
let b = Object.assign({}, a)
a.age = 2
console.log(b.age) // 1

C. let a = {
age: 1
}
let b = {...a}
a.age = 2
console.log(b.age) // 1

D. let a = {

age: undefined,

jobs: function() {},

name: 'yck'

}

let b = JSON.parse(JSON.stringify(a))

console.log(b) // { age: undefined, jobs: function() {}, name: 'yck'}