Object.assign 浅拷贝还是深拷贝

Object.assign 可以把 n 个源对象拷贝到目标对象中去，如下

let m ={name: {asd: '123'}}
let n = Object.assign({}, m)
console.log(n)

运行结果：

{name: {asd: '123'}}

那到底是深拷贝还是浅拷贝呢，答案是第一级属性深拷贝，以后级别属性浅拷贝 。大家看下面两段代码
例1

let s ={name: {asd: '123'}}
let d = Object.assign({}, s)
d.name.asd = '123456789'
console.log(d, s)运行结果：

{name:{asd: "123456789"}}

{name:{asd: "123456789"}}

例2
let o ={name: {asd: '123'}}
let p = Object.assign({}, o)
p.name = '123456789'
console.log(p, o)

运行结果：
{name: "123456789"}

{name: {asd: "123"}}