無法使用ionic2從數組中檢索數據

Question

我正在使用Ionic2創建應用程序，並且試圖從數組中打印歌​​曲標題列表。 我有這兩個文件，但我無法獲取歌曲列表，甚至都不會收到錯誤和警告。

songlist.ts

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import {Page} from 'ionic-angular';

@Component({
  templateUrl: 'build/pages/songlist/songlist.html',
})

export class Songlist {
    songs
    test
    constructor(private navCtrl: NavController) {
        this.songs = ['Song 1','song 2','song 3'];
        this.test = "this is a test";
    }
}

songlist.html

<ion-header>
  <ion-navbar>
    <ion-title>Ionic 2 Application</ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>
{{test}} // "this is a test" is correctly printed
  <ion-list class="messageList">
     <ion-item *ngFor="let item of songs">{{item}}</ion-item>  
  </ion-list>
</ion-content>

Answer 1

songs數組未正確聲明：

export class Songlist {
    private songs: Array<string>; // <- That's how the array should be declared

    constructor(private navCtrl: NavController) {
        this.songs = ['Song 1','song 2','song 3'];
    }
}