物件拷貝方式

1、淺拷貝

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)
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es6擴充套件符

let a = {name:'le'}
let b = {age:8}
let c = {...a,...b}
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2.深拷貝具有遞迴特性 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 }
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如果物件裡沒有函式是可以達到目的的，但是物件裡有函式則會將其忽略

3.深拷貝 遞迴拷貝 解決函式屬性問題

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);
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