在处理拖放操作时，需要手动从数组中删除项目并重新排序。以下是示例代码：

// HTML模板

// 组件 export class MyComponent implements OnInit { items: FormArray;

constructor(private fb: FormBuilder) {}

ngOnInit() { this.items = this.fb.array([ { name: 'Item 1' }, { name: 'Item 2' }, { name: 'Item 3' }, { name: 'Item 4' }, ]); }

onDrop(event: CdkDragDrop) { if (event.previousContainer === event.container) { moveItemInFormArray( this.items, event.previousIndex, event.currentIndex ); } else { transferItemInFormArray( this.items, event.previousIndex, event.currentIndex ); } } }

// 帮助函数 export function moveItemInFormArray(array: FormArray, fromIndex: number, toIndex: number) { const item = array.at(fromIndex); array.removeAt(fromIndex); array.insert(toIndex, item); }

export function transferItemInFormArray(fromArray: FormArray, fromIndex: number, toIndex: number) { const item = fromArray.at(fromIndex); fromArray.removeAt(fromIndex);

const toArray = toIndex >= fromArray.length ? fromArray : fromArray.parent.get('items') as FormArray; toArray.insert(toIndex, item); }