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我有這個類,我實例化SelectedNames數組。我試圖在構造函數方法簽名和構造函數方法體中實例化它。即使被實例化也無法讀取未定義的屬性'推'
userstate.model.ts
export class UserState{
constructor(
public StartsWithFilters: string[],
public EndsWithFilters: string[],
public ContainsFilters: string[],
public EqualsFilters: string[],
public SelectedNames: string[],
public CurrentName : string
){
this.SelectedNames = [];
}
}
在這個類中,我實例化UserState。
home.component.ts
export class HomeComponent implements OnInit {
userState : UserState = {};
constructor(
private nameService : NameService,
public auth : AuthService) {
}
getNextName(){
this.nameService.getNextName()
.subscribe(
name => this.userState.CurrentName = name.NameText,
error => alert("getNextName: error")
);
}
selectName(){
this.userState.SelectedNames.push(this.userState.CurrentName);
}
ngOnInit() {
}
btnNextClickedEvent(): void {
this.getNextName();
}
btnSelectClickedEvent(): void {
this.selectName();
}
}
名稱服務,認證服務,home.component.html顯示器{{userState.CurrentName}},和getNextName的()工作正常。
Error in selectName(): Cannot read property 'push' of undefined.
就好像SelectedNames是未定義的一樣。
什麼給?
乾杯