範例JS 陣列和物件的深拷貝操作

本文實例講述了JS 陣列和物件的深拷貝運算。分享給大家供大家參考，具體如下：

一.數組的深拷貝

let arr = [
 undefined,
 function(){
  console.log(123); 
 },
 true,
 null,
 {
  name:"123",
  age:23
 }
];
// arr作为拷贝对象

1. Array.from()

Array.from()能將一個類別數組轉換成一個真正的數組，因此它傳回的是一個新數組。

let arr1 = Array.from(arr);
arr[0] = 2;
console.log(arr1);
// [ undefined, [Function], true, null, { name: '123', age: 23 } ]

2. Object.assign()

let arr1 = Object.assign([], arr)
arr[0] = 2;
console.log(arr1);
// [ undefined, [Function], true, null, { name: '123', age: 23 } ]

此方法也可用作物件的深拷貝

3. Slice()

let arr1 = arr.slice(0);
arr[0] = 2;
console.log(arr1);
// [ undefined, [Function], true, null, { name: '123', age: 23 } ]

4 . Concat()

let arr1 = arr.concat();
arr[0] = 2;
console.log(arr1);
// [ undefined, [Function], true, null, { name: '123', age: 23 } ]

5. 擴充運算子深拷貝

// let [...arr1] = arr; // 这两种都可以
let arr1 = [...arr];
arr[0] = 2;
console.log(arr1);
// [ undefined, [Function], true, null, { name: '123', age: 23 } ]

此方法也可用作物件的深拷貝

二.物件的深拷貝

let obj = {
 name: "a",
 age: 20,
 sex: false,
 user: {
  a: 20,
  n: "b"
 },
 f: function(){
  return 1;
 },
 u: undefined,
 n: null
}

用擴充運算子和Object.assign()方法可以深拷貝物件

let obj1 = Object.assign({}, obj)
obj[age] = 2;
console.log(obj1);
// let obj = { name: "a", age: 20, sex: false,user: {a: 20,n: "b},f: function(){return 1;},u: undefined,n: null}

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