在angularfire中$ getAuth和$ onAuth之间的区别 [英] Difference between $getAuth and $onAuth in angularfire

问题描述

我读了 angularfire docs，发现了两个类似的服务 $ getAuth 和 $ onAuth 由 firebase 给出，两者都是为了检查用户认证而编写的。但我找不到他们之间的任何区别，任何人都可以为我描述他们？

我也想知道什么是每个使用的好方案这些服务。谢谢

官方文档链接 $ getAuth（）说：
$ b

同步检索客户端的当前身份验证状态

而 $ onAuth（）则表示：

侦听客户端身份验证状态的更改。所提供的回调将在客户端的身份验证状态改变时触发。

所以你可以调用 $ getAth（） 在你的代码中，如果你需要知道用户是否被认证。假设您想在计算时使用不同的价格进行验证：

  var productPrice = 50; 
 $ scope.price = auth。$ getAuth（）？ 0.8 * productPrice：productPrice; 
  

另一方面，如果您希望在 >用户通过身份验证，您可以使用 $ onAuth（）。一个典型的例子是当用户登录/退出时将用户路由到不同的URL。

I was reading angularfire docs, and i found two similar services $getAuth and $onAuth given by firebase and both are written for checking user authentication. But i can't found any differences between both of them, can anybody describe them for me ?

and i also want to know that what is the good scenario to use each of these services. Thanks

link of official documentation

解决方案

As the documentation for $getAuth() says:

Synchronously retrieves the current authentication state of the client

While for $onAuth() it says:

Listens for changes to the client’s authentication state. The provided callback will fire when the client’s authenticate state changes.

So you'd call $getAth() in your code if you need to know whether the user is authenticated. Say that you want to use a different price in a calculation when the user is authenticated:

var productPrice = 50;
$scope.price = auth.$getAuth() ? 0.8 * productPrice : productPrice;

If on the other hand you'd want to do something based on when the user is authenticated, you'd use $onAuth(). A typical example would be to route the user to a different URL when they sign-in/get signed out.

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