对象拷贝方式

1、浅拷贝

Object.assign()

let a = {name:'le'}
let b = {age:8}
let d = {}
Object.assign(d,a,b)
console.log(d)
//或者 
let d = Object.assign(a,b)
console.log(d)

es6扩展符

let a = {name:'le'}
let b = {age:8}
let c = {...a,...b}

2.深拷贝具有递归特性 JSON.parse(JSON.stringify())

let a = {name:'le',fn:function(){
    console.log('fn')
}}
let e = JSON.parse(JSON.stringify(a))
console.log(e)
//{ name: 'le', age: 8 }

如果对象里没有函数是可以达到目的的，但是对象里有函数则会将其忽略

3.深拷贝 递归拷贝 解决函数属性问题

function deepClone(obj){
    if(obj === null) return null;
    if(typeof obj !== 'object') return obj; 
    if(obj instanceof RegExp) return new RegExp(obj);
    if(obj instanceof Date) return new Date(obj);
    let newObj = new obj.constructor();
    for(let key in obj){
        newObj[key] = deepClone(obj[key]);
    }
    return newObj;
};
let o = {name:{name:1}}
let test = deepClone(o);
o.name.name = 'hello';
console.log(test);