存储get（）永远不会返回离子2中的值

Learning ionic 2, particularly using Storage.

学习离子2,特别是使用存储。

So, I just created a blank app:

所以,我刚创建了一个空白的应用程序:

ionic start storagetest blank --v2

Following this the docs:

在此之后的文档:

cordova plugin add cordova-sqlite-storage --save
npm install --save @ionic/storage

Then, my app.module.ts looks like this:

然后,我的app.module.ts看起来像这样:

import { NgModule, ErrorHandler } from '@angular/core';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';

import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';

import { IonicStorageModule } from '@ionic/storage';

@NgModule({
  declarations: [
    MyApp,
    HomePage
  ],
  imports: [
    IonicModule.forRoot(MyApp),
    IonicStorageModule.forRoot()
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler}
  ]
})
export class AppModule {}

And then went ahead to home.ts:

然后继续回家。

import { Component } from '@angular/core';

import { NavController } from 'ionic-angular';

import { Storage } from '@ionic/storage';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

  constructor(public navCtrl: NavController, storage: Storage) {

     storage.ready().then(() => {
       storage.set('name', 'Max');
       storage.get('name').then((val) => {
         console.log('Your name is', val);
       })
     });

  }

}

There is nothing in the javascript log. It appears that get() is never returning the value. However, ready() does work, as I have put a console.log() in it.

javascript日志中没有任何内容。似乎get()永远不会返回值。但是,ready()确实有效,因为我在其中放了一个console.log()。

What is wrong then?

那有什么不对?

I am running the app on Chrome, Mac OS.

我正在Chrome,Mac OS上运行该应用。

1 个解决方案

#1

storage.set is asynchronous and returns a promise.So value may not be set when get().then() is called. Try:

storage.set是异步的,并且在调用get()。then()时可能不会设置promise.So值。尝试:

 storage.ready().then(() => {
       storage.set('name', 'Max').then(()=>
       storage.get('name').then((val) => {
         console.log('Your name is', val);
       });
      );
     });

You have no error handler in then or catch() method which is probably why nothing is logged.

你没有错误处理程序或catch()方法,这可能是为什么没有记录任何东西。

#1