Question

我是离子应用程序开发人员的新手，我面临着这个问题：当我打开一个组件时，它会显示错误消息，即cannot use namespace as type ionic(NgZone,NavController and googlePlus)。为什么会收到此错误消息？

这是我的代码：

export class HomePage {
  userProfile: any = null;
  zone: NgZone;

  constructor(public navCtrl: NavController, private googlePlus: GooglePlus) {
    this.zone = new NgZone({});
    firebase.auth().onAuthStateChanged( user => {
      this.zone.run( () => {
        if (user){
          this.userProfile = user;
        } else { 
          this.userProfile = null; 
        }
      });
    });
  }
}

Answer 1

尝试以下代码：（ NgZone对象可以如下创建）

export class HomePage {
  userProfile: any = null;
  zone: NgZone;

  constructor(public navCtrl: NavController, private googlePlus: GooglePlus, private ngZone: NgZone) {
    this.zone = ngZone;
    firebase.auth().onAuthStateChanged( user => {
      this.zone.run( () => {
        if (user){
          this.userProfile = user;
        } else { 
          this.userProfile = null; 
        }
      });
    });
  }
}

Answer 2

也许你忘了更新项目的包。请尝试：

npm install / npm update

无法使用名称空间“ NavController”，NgZone，Google作为一种类型

2 个答案: