无法在加载时获得currentUser [英] Can't get currentUser on load

问题描述

尝试检查用户是否通过 firebase.auth（）。currentUser 登录时：

When trying to check if a user is signed in via firebase.auth().currentUser like this:

if (firebase.auth().currentUser === null) {
  console.log('User not signed in');
}

每当我刷新页面，或者在上面导航时都返回null（即使我刚刚登录）。

Whenever I refresh the page, or navigate around the above returns null (even though I have just logged in).

奇怪的是，如果我记录

console.log(firebase.auth().currentUser) // This returns null
console.log(firebase.auth()) // Here I can inspect the object and currentUser exists...!

我真的不知道这里发生了什么。我正在使用React和Redux，但我说的并不重要。

I don't really know what's going on here. I'm using React and Redux, but it shouldn't really matter I'd say.

firebase初始化并且你无法访问currentUser？如果是这样，我如何在 firebase.auth（）的日志输出中看到它？

Is there a small delay where the firebase initialises and you can't access the currentUser? If so, how can I see it in the log output of firebase.auth()?

推荐答案

这是一个常见问题。
https://firebase.google.com/docs/auth/web / manage-users
您需要向onAuthStateChanged添加一个观察者来检测初始状态和所有后续状态更改，

This is a commonly asked question. https://firebase.google.com/docs/auth/web/manage-users You need to add an observer to onAuthStateChanged to detect the initial state and all subsequent state changes,

firebase.auth().onAuthStateChanged(function(user) {
  if (user) {
    // User is signed in.
  } else {
    // No user is signed in.
  }
});

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