对象,数组的深复制

对象深复制

1. 如果对象的属性值不是一个对象的引用

Object.assign

function (obj){
let newObj={}
for(var key in obj){
newObj[key]=obj[key]
}
return newObj;
}

2.即使对象的属性是对象也可以

function deepCopy(obj){
let newObj={}
for(var key in obj){
if(Object.prototype.toString.call(obj[key]) === "[object Object]"){
deepCopy(obj[key])
}else{
newObj[key]=obj[key]
}
return newObj
}

数组的深拷贝

1. 循环拷贝

var arr = [1,2,3,4,5]
var arr2 = copyArr(arr)
function copyArr(arr) {
	let res = []
	for (let i = 0; i < arr.length; i++) {
	 res.push(arr[i])
	}
	return res
}

2.concat方法

var arr = [1,2,3,4,5]
var arr2 = arr.concat()
arr[2] = 5
console.log(arr)
console.log(arr2)

数组里面含有对象

 let test = [1, 2, 3, { name: 'zhangsan', age: 23 }]
    function deep(arr) {
      let newArr = []
      for (var i in arr) {
        if (Object.prototype.toString.call(arr[i]) !== '[object Object]') {
          newArr.push(arr[i])
        } else {
          newArr.push({ ...arr[i] })
        }
      }
      return newArr
    }

对象里面含有数组

 let test = {
      name: 2,
      age: 3,
      friend: [1, 2, 3]
    }
    function deep(obj) {
      let newObj = {};
      for (var i in obj) {
        if (Object.prototype.toString.call(obj[i]) !== '[object Arrary]') {
          newObj[i] = obj[i]
        } else {
          newObj[i] = [...obj[i]]
        }
      }
      return newObj
    }

对象数组混合

 function deep(obj) {
      let newObj = {};
      for (var i in obj) {
        if (Object.prototype.toString.call(obj[i]) !== '[object Arrary]' || Object.prototype.toString.call(arr[i]) !== '[object Object]') {
          newObj[i] = obj[i]
        } else {
          newObj[i] = deep(obj[i])
        }
      }
      return newObj
    }

我也基本测试了,希望大佬们看到错误指出来

发现一篇文章很不错