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[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)"
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