如何在HTML中显示TypeScript对象(离子/Firebase/Angular)

class Person {
  name: string;
  age: number;
}

const person: Person = {
  name: "John",
  age: 25
};

<p>Name: {{ person.name }}</p>
<p>Age: {{ person.age }}</p>

<ion-label>Name: {{ person.name }}</ion-label>
<ion-label>Age: {{ person.age }}</ion-label>

import { Component } from '@angular/core';
import { AngularFireDatabase } from '@angular/fire/database';

@Component({
  selector: 'app-person',
  template: `
    <p>Name: {{ person.name }}</p>
    <p>Age: {{ person.age }}</p>
  `
})
export class PersonComponent {
  person: Person;

  constructor(private db: AngularFireDatabase) {
    this.db.object('person').valueChanges().subscribe((data: Person) => {
      this.person = data;
    });
  }
}