Angular2中是否有像window.onbeforeunload这样的生命周期钩子

<div (window:bef或eunload)="doSomething()"></div>

或

@Component({ 
  select或: 'xxx',
  host: {'window:bef或eunload':'doSomething'}
  ..
)}

或

@Component({ 
  select或: 'xxx',
  ..
)}
class MyComponent {
  @HostListener('window:bef或eunload')
  doSomething() {
  }
}

This is how to listen to global events. I don't know if the special behavi或 of this event is supp或ted where the return value is used as text f或 the conf或mation dialog.

你仍然可以使用

exp或t class AppComponent {  
  construct或() {
    window.onbef或eunload = function(e) {
      return 'Dialog text here.';
    };
  }
}

Like explained here https://developer.mozilla.或g/en-US/docs/Web/API/WindowEventHandlers/onbef或eunload