Angular:如何设置多个条件的[placeholder]

<input [ngSwitch]="condition">
  <ng-container *ngSwitchCase="'condition1'">
    <input placeholder="Placeholder for condition 1">
  </ng-container>
  <ng-container *ngSwitchCase="'condition2'">
    <input placeholder="Placeholder for condition 2">
  </ng-container>
  <ng-container *ngSwitchDefault>
    <input placeholder="Default placeholder">
  </ng-container>
</input>

<input *ngIf="condition === 'condition1'" placeholder="Placeholder for condition 1">
<input *ngIf="condition === 'condition2'" placeholder="Placeholder for condition 2">
<input *ngIf="condition !== 'condition1' && condition !== 'condition2'" placeholder="Default placeholder">

<input [placeholder]="condition === 'condition1' ? 'Placeholder for condition 1' : (condition === 'condition2' ? 'Placeholder for condition 2' : 'Default placeholder')">