javascript - 以 Angular 2 复制对象数组

Question

我有两个名为“persons”和“persons2”的数组， 'persons2' 数组将是 'persons' 数组的副本， 但问题是当我复制它时，我想改变第二个数组，第一个数组也在改变。这是我的代码:

  export class AppComponent {

  persons = [
    {
      name:'David',
      lname:'Jeu'
    }
  ];

  persons2=[...this.persons];

  constructor(){
      console.log(this.persons[0]);
      this.persons2[0].name='Drake';
      console.log(this.persons[0]);

      console.log(this.persons2[0]);
  }

}

Answer 1

But the problem is when I copy it, and I want to change the second array, the first array is also changing

那是因为两个数组中的对象共享相同的引用。要执行深层复制，请尝试以下操作:

let persons2 = person.map(x => Object.assign({}, x));

或者

let person2 = JSON.parse(JSON.stringify(person));