关于javascript:JavaScript深拷贝

const oldObj = {  name: 'tao',  age: 20,  color: ['orange', 'green', 'blue'],  friend: {    name: 'gua'  },  fn: function(){    console.log(1)  }}function deepClone(obj) {  // 判断不是数组或对象  if(typeof obj !== 'object' || obj === null) {    return obj  }  let res  if(obj instanceof Array) {    res = []  } else {    res = {}  }  for(let k in obj) {    // 过滤掉 obj 原型上的属性    if(obj.hasOwnProperty(k)) {      res[k] = deepClone(obj[k])    }  }  return res}const newObj = deepClone(oldObj)newObj.friend.name = 'taotao'console.log(oldObj, newObj)newObj.fn()