问使用菜单卸载时离子意外取消订阅事件

EN

import { Component, OnInit, OnDestroy } from '@angular/core';
import { NavController, Events } from 'ionic-angular';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage /*implements OnInit, OnDestroy*/ {

  constructor(public navCtrl: NavController,
              public events: Events) {}




  ionViewWillEnter() {
    console.log("ion enter info subscribed");
    this.events.subscribe('get-info');
    this.events.subscribe("value",(data) => {
      console.log("ion enter info subscribed");
    this.events.subscribe('get-info');
    });
  }

  ionViewWillUnload() {
    console.log("ion unload info unsubscribed");
     this.events.publish('value',true)
    this.events.unsubscribe('get-info');

  }