===== ngSwitch =====
<code html>
<div [ngSwitch]="color">
    <div *ngSwitchCase="'red'">Red</div>
    <div *ngSwitchCase="'blue'">Blue</div>
    <div *ngSwitchCase="'orange'">Orange</div>
    <div *ngSwitchDefault>Default</div>
  </div>
</code>
<code javascript>
export class TestNgswitchComponent implements OnInit {
  public color = "blue";
  constructor() { }
  ngOnInit() {
  }
}
</code>