使用angularjs 2过滤器从另一个下拉列表中删除选定的选项

<select [(ngModel)]="selectedOption">
  <option *ngFor="let option of allOptions" [value]="option">{{ option }}</option>
</select>

<select>
  <option *ngFor="let option of selectedOptions" [value]="option">{{ option }}</option>
</select>

export class MyComponent {
  allOptions: string[] = ['Option 1', 'Option 2', 'Option 3', 'Option 4'];
  selectedOptions: string[] = [];

  // 定义一个方法来删除选定的选项
  removeSelectedOption() {
    const index = this.selectedOptions.indexOf(this.selectedOption);
    if (index > -1) {
      this.selectedOptions.splice(index, 1);
    }
  }
}

export class MyComponent {
  selectedOption: string;

  // ...
}

<select [(ngModel)]="selectedOption" (change)="removeSelectedOption()">
  <option *ngFor="let option of allOptions" [value]="option">{{ option }}</option>
</select>