如何使用*ngFor通过嵌套对象JSON进行迭代

data = {
  name: 'John',
  age: 25,
  address: {
    street: '123 Main St',
    city: 'New York',
    country: 'USA'
  }
};

<div *ngFor="let key of Object.keys(data)">
  <p>{{ key }}: {{ data[key] }}</p>
  <div *ngIf="isObject(data[key])">
    <div *ngFor="let innerKey of Object.keys(data[key])">
      <p>{{ innerKey }}: {{ data[key][innerKey] }}</p>
    </div>
  </div>
</div>

isObject(value: any): boolean {
  return typeof value === 'object' && value !== null;
}