Firebase 停止监听 onAuthStateChanged [英] Firebase stop listening onAuthStateChanged

问题描述

从 ^3.0.0 版本开始，我很难删除身份验证状态更改侦听器.

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

根据文档启动侦听器:

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

但是，我在文档中找不到任何提到删除身份验证状态更改侦听器的地方.Firebase.Auth 类上有一个名为 removeAuthTokenListener 的特殊函数.不幸的是，它没有记录(firebase 文档参考).

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).

通过浏览器的网络控制台.

Via your browser's web console.

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

打印带有一个参数的函数定义.我尝试执行以下操作:

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);

但这并没有起到任何作用.

but that didn't do anything.

推荐答案

根据 文档，onAuthStateChanged() 函数返回

观察者的取消订阅功能.

The unsubscribe function for the observer.

所以你可以:

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

然后:

unsubscribe();

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