如何在单击输出时保留值(ng-selelect)

<ng-select [(ngModel)]="selectedValue">
  <ng-option value="option1">Option 1</ng-option>
  <ng-option value="option2">Option 2</ng-option>
  <ng-option value="option3">Option 3</ng-option>
</ng-select>

<ng-select [(ngModel)]="selectedValue" (ngModelChange)="onValueChange()">
  <ng-option value="option1">Option 1</ng-option>
  <ng-option value="option2">Option 2</ng-option>
  <ng-option value="option3">Option 3</ng-option>
</ng-select>

onValueChange() {
  // 在这里执行其他操作
  console.log(this.selectedValue);
}