引用一个类型，但它在这里用作值

Question

如何修复此错误。 我需要在函数中声明一个接口类型的变量

//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

我想你的意思是：

let activityList: Activity[];