引用一种类型，但此处将其用作值

Question

如何解决此错误。 我需要在函数中声明接口类型的变量

//interface     
export interface Activity {
        id: number;
        name: string;
    }

/*import statements are here*/

export class SelectActiivityComponent implements OnInit {
private activityList: Activity[];//its working 

 changeView(){
     activityList: Activity[];
//error here
//'Activity' only refers to a type, but is being used as a value here.
}
....
....
...

Answer 1

我认为您打算这样做：

let activityList: Activity[];