[cdkDropListConnectedTo]="[todo]"
未使用Angular 9连接到另一个div中的#todo
它说“Component_name”上不存在“todo”属性
cdkDropList #todo="cdkDropList" [cdkDropListData]="unScheduleTasksArray" [cdkDropListConnectedTo]="[prog]" (cdkDropListDropped)="drop($event)"
另一个 div 是
cdkDropList #prog="cdkDropList" [cdkDropListData]="scheduleTasksArray"
[cdkDropListConnectedTo]="[todo]" (cdkDropListDropped)="drop($event)"