有没有办法把ngmodel和ngfor一起使用?

使用 Object.assign 并在取消功能中分配

constructor(){
  this.unChangedObject = Object.assign({},this.object  )
}

cancel(){
   this.object = this.unChangedObject;
}

你可以换个角度看。只在提交时更新。为此,你可以在 *ngFor 返回复制对象的数组。不过,此解决方案仅适用于浅层对象,但您也可以尝试找到一些深复制方法(下面是未经测试的代码):

管

@Pipe({
  name: 'copyArr'
})
export class CopyArrPipe implements PipeTransform {
  public transform(arr: object[] = []): object[] {
    return arr.map(obj => ({...obj}));
  }
}

模板

<ng-container *ngIf="objects | copyArr as objectsCopy">

  <div *ngFor="let object of objectsCopy">
    <input [(ngModel)]="object.isSelected" type="checkbox"> 
  </div>

  <button type="button" (click)="cancel()">Cancel</button>
  <button type="button" (click)="commit(objectsCopy)">Commit</button>
</ng-container>

成分

@Component({...})
export class FooBarComponent {

  objects = [];

  cancel(){
    this.objects = [...this.objects];
  }

  commit(newObjects) {
    this.objects = newObjects;
  }
}