本文实例讲述了js 数组和对象的深拷贝操作。分享给大家供大家参考，具体如下：
一.数组的深拷贝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()能将一个类数组转化成一个真正的数组，因此它返回的是一个新数组。
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 } ]
此方法也可用作对象的深拷贝
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. 扩展运算符深拷贝// 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 } ]
此方法也可用作对象的深拷贝
二.对象的深拷贝let obj = { name: "a", age: 20, sex: false, user: { a: 20, n: "b" }, f: function(){ return 1; }, u: undefined, n: null}
用扩展运算符和object.assign()方法可以深拷贝对象
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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以上就是示例js 数组和对象的深拷贝操作的详细内容。