相关疑难解决方法(0)

我附上了我的angular2代码片的plunker.我想从我的JSON打印一个字段但是无法打印,因为最初我的Object是null并且它是通过Promise填充的.

这是我的组件文件

import {Component, NgModule, OnInit} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

class MyData {
  xyz : MySubData;
}

class MySubData {
  name : string;
} 
@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Hello {{name}}</h2>

      {{abc.xyz.name}}
    </div>
  `,
})
export class App implements OnInit {
  abc : MyData = null;
  constructor() {
    this.name = 'Angular2'
  }

  ngOnInit() {
    setTimeout(() => {
      this.abc = new MyData();
      this.abc.xyz = new MySubData();
      this.abc.xyz.name = "Binita";
    }, 2000);
  }
}

@NgModule({
  imports: [ BrowserModule ], …