Question

我创建了一个类模型，但我不知道如何用值填充类。

User.ts

export class User {
    constructor(
        username: string,
        password: string,
        token: string
    ) { }
}

app.component.ts

  ngOnInit() {

    let user = new User('uname' , 'pword', 'sampletoken');
    console.log(user);
  }

运行此命令时，用户仍然是空的。

Answer 1

在构造函数参数中添加访问说明符，以使其成为类属性。否则，它将仅被视为构造函数方法范围内的属性。

User.ts

export class User {
    constructor(
        public username: string,
        public password: string,
        public token: string
    ) { }
}

Answer 2

另一种方法是您也可以这样做：-

@child_type = ChildType.find(params[:child_tye_id])
@child_list = @child_type.children

这是您可以在控制台中检查的链接。 CodeSandbox demo

Answer 3

您忘记添加变量并在构造函数中分配变量：

export class User {
    username: string;
    password: string;
    token: string;

    constructor(username: string,
                password: string,
                token: string) {
         this.username = username;
         this.password= password;
         this.token= token;
    }
}

Answer 4

尝试这样：

Working Demo

export class User {
  username: string;
  password: string;
  token: string;
  constructor(username: string, password: string, token: string) {
    this.username = username;
    this.password = password; 
    this.token = token;
  }
}

Answer 5

我将通过一个示例向您展示如何在angular中使用一个类。

items.ts

import { Injectable } from '@angular/core';

@Injectable()
export class Items {
  items: Item[] = [];

  defaultItem: any = {
    "name": "Burt Bear",
    "profilePic": "assets/img/speakers/bear.jpg",
    "about": "Burt is a Bear.",
  };


  constructor(public name: string) {
    let items = [
      {
        "name": "Burt Bear",
        "profilePic": "assets/img/speakers/bear.jpg",
        "about": "Burt is a Bear."
      }
    ];

  }

}

让我们检查如何获取这些数据

item-details.ts

import { Items } from '../../providers';

export class ItemDetailPage {
  item: any;

  constructor(items: Items) {
    this.item =  items.defaultItem;
  }

}

如何用角度填充打字稿类模型

5 个答案: