在angularfire中$ getAuth和$ onAuth之间的区别

问题描述

我读了 $ getAuth（）说：
$ b

而 $ onAuth（）则表示：

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:

While for $onAuth() it says:

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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