Firebase停止侦听AuthStateChanged [英] Firebase stop listening onAuthStateChanged

问题描述

从版本^ 3.0.0开始，我很难去除auth状态改变侦听器。

firebase.auth （）.onAuthStateChanged（function（user）{
//处理
}）;

但是，我无法找到引用remove auth状态更改侦听器的文档中的任何地方。在Firebase.Auth类中有一个特殊的函数叫做 removeAuthTokenListener 。不幸的是，它没有记录（ Firebase文档参考）。

通过浏览器的网络控制台。

  var auth = firebase.auth（）; 
 auth.removeAuthTokenListener; 
  

打印一个带有一个参数的函数定义。我试图做到以下几点：$ b​​
$ b $ p $ this.authListener = firebase.auth（）。onAuthStateChanged（function（user）{.. 。}）;
firebase.auth（）。removeAuthTokenListener（this.authListener）;


但是没有做任何事情。根据 auth.Auth＃onAuthStateChanged>文档， onAuthStateChanged（）函数返回

观察者的取消订阅功能。

所以你可以：

  var unsubscribe = firebase.auth（）。onAuthStateChanged（function（user）{
 //处理
}）; 
  

然后：

 退订（）; 
  

As of version ^3.0.0, I'm having a difficult time removing the auth state change listener.

To start the listener per the documentation:

firebase.auth().onAuthStateChanged(function (user) {
    // handle it
});

However, I cannot find anywhere in the documentation that refers to a remove auth state change listener. There is peculiar function on the Firebase.Auth class called removeAuthTokenListener. Unfortunately it's not documented (firebase docs reference).

Via your browser's web console.

var auth = firebase.auth();
auth.removeAuthTokenListener;

prints a function definition that takes one parameter. I tried to do the following:

this.authListener = firebase.auth().onAuthStateChanged(function (user) {...});
firebase.auth().removeAuthTokenListener(this.authListener);

but that didn't do anything.

解决方案

According to the documentation, the onAuthStateChanged() function returns

The unsubscribe function for the observer.

So you can just:

var unsubscribe = firebase.auth().onAuthStateChanged(function (user) {
    // handle it
});

And then:

unsubscribe();

这篇关于Firebase停止侦听AuthStateChanged的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！