自己的 toJSON 将对象对象放在本地存储中

Question

我需要我的登录用户，并且即使在刷新后也能继续获取他，我将他的值放入本地存储中。当我使用 JSON.stringify() 时，它会将正确的值放在本地存储中，但在键名前面带有 _，我不知道为什么（我将我的私有属性命名为 _id，例如，但我写了 getter，我认为应该再次正常命名它们吗？）。因为不行，所以自己写了toJSON方法：

toJSON(): any {
    return {
      id: this._id,
      firstName: this._firstName,
      lastName: this._lastName,
      email: this._email,
      phoneNumber: this._phone,
      country: this._country,
      comments: this._comments.map(c => c.toJSON)
    };

但是当我调用它时，它会将 [object Object] 放入本地存储中，我不知道为什么会这样做。

我基本上需要让 JSON.stringify 将我的属性放在 localStorage 中，或者我需要修复我的 toJson。

用户模型：

import { Comment } from '../image/comment.model';

export class User {
  constructor(
    private _id: number,
    private _firstName: string,
    private _lastName: string,
    private _email: string,
    private _phone: string,
    private _country: string,
    private _comments: Comment[]
  ) {}

  get id(): number {
    return this._id;
  }

  get firstName(): string {
    return this._firstName;
  }

  get lastName(): string {
    return this._lastName;
  }

  get email(): string {
    return this._email;
  }

  get phone(): string {
    return this._phone;
  }

  get country(): string {
    return this._country;
  }

  get comments(): Comment[] {
    return this._comments;
  }

  static fromJSON(json: any): User {
    return new User(
      json.id,
      json.firstName,
      json.lastName,
      json.email,
      json.phoneNumber,
      json.country,
      json.comments
    );
  }

  toJSON(): any {
    return {
      id: this._id,
      firstName: this._firstName,
      lastName: this._lastName,
      email: this._email,
      phoneNumber: this._phone,
      country: this._country,
      comments: this._comments.map(c => c.toJSON)
    };
  }
}

认证服务

this.getUser(email).subscribe(usr => { //this gets my user via its email from the backend
              localStorage.setItem('visitor', usr.toJSON());
              this._loggedInUser$.next(usr);
            });

this._loggedInUser$ = new BehaviorSubject<User>(
      localStorage.getItem('visitor')
        ? User.fromJSON(localStorage.getItem('visitor'))
        : null
    );

  get loggedInUser$(): BehaviorSubject<User> {
    return this._loggedInUser$;
  }

评论

export class Comment {
  private _id: number;
  constructor(
    private _author: string,
    private _content: string,
    private _date: Date,
    private _imageId: number,
    private _visitorId: number
  ) {}

  get id(): number {
    return this._id;
  }
  set id(value: number) {
    this._id = value;
  }

  get author(): string {
    return this._author;
  }

  get content() {
    return this._content;
  }

  get date(): Date {
    return this._date;
  }

  get imageId(): number {
    return this._imageId;
  }

  get visitorId(): number {
    return this._visitorId;
  }

  static fromJSON(json: any): Comment {
    let comment = new Comment(
      json.author,
      json.content,
      json.date,
      json.myImageId,
      json.visitorId
    );
    comment.id = json.id;
    return comment;
  }

  toJSON(): any {
    return {
      id: this._id,
      author: this._author,
      content: this._content,
      date: this._date,
      myImageId: this._imageId,
      visitorId: this._visitorId
    };
  }
}

如果需要更多代码，请告诉我！

Answer 1

这可能是因为您为变量指定了与 JSON 对象属性名称相同的名称。如果您想摆脱下划线，请尝试为变量提供一些不同的名称。