如何检查三个输入域中是否至少有一个填充了Angular 7中的内容

<input [(ngModel)]="input1" (ngModelChange)="checkInputs()">
<input [(ngModel)]="input2" (ngModelChange)="checkInputs()">
<input [(ngModel)]="input3" (ngModelChange)="checkInputs()">

input1: string;
input2: string;
input3: string;

checkInputs() {
  if (this.input1 || this.input2 || this.input3) {
    console.log('至少有一个输入域填充了内容');
  } else {
    console.log('三个输入域都没有填充内容');
  }
}

<input [(ngModel)]="input1" [ngModelOptions]="{ standalone: true }" [required]="true">
<input [(ngModel)]="input2" [ngModelOptions]="{ standalone: true }" [required]="true">
<input [(ngModel)]="input3" [ngModelOptions]="{ standalone: true }" [required]="true">