使用angular-2读取[object object]，

let obj = { name: 'John', age: 30 };
let jsonString = JSON.stringify(obj);
console.log(jsonString); // 输出: {"name":"John","age":30}

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

@Component({
  selector: 'app-root',
  template: `
    <div *ngFor="let key of objectKeys(obj)">
      {{ key }}: {{ obj[key] }}
    </div>
  `,
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  obj = { name: 'John', age: 30 };

  get objectKeys() {
    return Object.keys(this.obj);
  }
}

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'objectToString'
})
export class ObjectToStringPipe implements PipeTransform {
  transform(value: any): string {
    return JSON.stringify(value);
  }
}

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

@Component({
  selector: 'app-root',
  template: `
    <div>{{ obj | objectToString }}</div>
  `,
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  obj = { name: 'John', age: 30 };
}