描述

• 当obj对象拷贝到obj2对象是childs参数不会重新创建新的对象,而是生成obj2.childs的指针,指向obj.childs栈(引用类型的值),当obj.childs更改是obj.childs的属性也会随之改变

var obj = {
    name:'zs',
    childs:{
        name:'ls'
    }
}

递归赋值对象(深拷贝)

var obj1 = {
	name:'zs',
	age:18,
	childs:{
    	dog:'jm',
		age:2
	},
	arr:[1,2,3,4,5,6,7]
}
	var obj2 = {}
	function deepCopy(obj1,obj2){
		for(var key in obj1){
			var tiem = obj1[key];
			if(tiem instanceof Array){
				obj2[key] = {}
				deepCopy(tiem,obj2[key])
			}else if(tiem instanceof Object){
				obj2[key] = [];
				deepCopy(tiem,obj2[key])
			}else{
				obj2[key] = obj1[key]
			}
		}
	}
	deepCopy(obj1,obj2);
	obj1.childs.age = 18
	console.log(obj1) //18
	console.log(obj2) //2

利用JSON实现深拷贝

let obj = {
    name:"测试"
}
let copyObj = JSON.stringify(obj)
let copyDeepObj = JSON.parse(copyObj)
​