angular - 如果存储键 = true，离子显示按钮

Question

isLogin如果 Ionic Storage = ，如何显示按钮true。

import { Storage } from '@ionic/storage';
constructor(
    private storage: Storage,
) { }

login(phone: string, password: string) {
    return this.http.post<any>(`/api/user/login`, { phone, password })
        .pipe(map(user => {
            this.storage.set('currentUser', user);
            this.storage.set('isLogin', true);
            this.currentUserSubject.next(user);
            return user;
        }));
}

ngOnInit() {
    this.storage.get('isLogin').then(result => {
        this.isLoginVal = result
        console.log(this.isLoginVal)
    })
}

<button mat-icon-button (click)="goToLogin()" *ngIf="!isLoginVal; else logged">
    <mat-icon>menu</mat-icon>
</button>

<ng-template #logged>
    <button mat-icon-button (click)="drawer()">
        <mat-icon>user</mat-icon>
    </button>
</ng-template>