如何使用本地存储代替本地存储？

问题描述

import { NativeStorage } from '@ionic-native/native-storage/ngx';
export class AuthService {
  userData: any; // Save logged in user data
  constructor(
    public nativeStorage: NativeStorage,private platform :Platform,public ngzone: ngzone // ngzone service to remove outside scope warning
  ) { }

  // Sign in with email/password
  // Returns true when user is logged in and email is verified
  
  get isLoggedIn(): boolean {
    const user = JSON.parse(this.nativeStorage.getItem('user'));
    return (user !== null && user.emailVerified !== false) ? true : false; 
  }
        
  // Sign in with Google
  // Auth logic to run auth providers
        
  // Returns true when user's email is verified
  get isEmailVerified(): boolean {
    const user = JSON.parse(nativeStorage.getItem('user'));
    return (user.emailVerified !== false) ? true : false;
  }
}

我以前使用过localStorage，但在我使用本机存储时出现错误找不到名称'nativeStorage'，它工作正常。您是说实例成员“ this.nativeStorage”吗？ 如果我添加替换到this.nativeStorage 错误是'Promise'类型的参数不能分配给'string'类型的参数。

解决方法

首先，始终通过this.引用依赖项注入变量

第二，返回类型this.nativeStorage.getItem('user')是promise。但是输入类型JSON.parse()需要一个string

所以尝试下面的代码

async get isLoggedIn(): boolean {
    const savedUser = await this.nativeStorage.getItem('user');
    const user = savedUser ? JSON.parse(savedUser) : null;

    return (user !== null && user.emailVerified !== false) ? true : false;
}