问题描述
我试图检查一个用户是否登录，但是我得到的结果很不一致，似乎涉及到某种竞争条件。我基本上使用了的代码：
I'm trying to check if a user is signed in or not, but I'm getting really inconsistent results that seem to have some sort of race condition involved. I basically took the code Google Developer Website:
gapi.load('auth2', function() {
auth2 = gapi.auth2.init({
client_id: 'my_client_id.apps.googleusercontent.com',
});
console.log(auth2.isSignedIn.get());
setTimeout(function(){console.log(auth2.isSignedIn.get())},50);
setTimeout(function(){console.log(auth2.isSignedIn.get())},500);
setTimeout(function(){console.log(auth2.isSignedIn.get())},1000);
});
由于某些原因，前两个返回false，第二个返回true。我有双重检查，并且我登录，所以看起来前两个应该返回true。我在想她吗？我查看了文档，似乎没有任何表明异步发生的东西，我不确定我应该等待什么，然后才能从获得可靠的结果。 isSignedIn call。
For some reason, the first two return false, and the second to return true. I have double checked, and I am signed in, so it seems like the first two should be returning true. What am I missing her? I've looked at the documentation, and there doesn't seem to be anything that indicated something asynchronous happening, and I'm not sure what I should be waiting on before I can get a reliable result from the isSignedIn call.
推荐答案
也许我在文档的某个地方错过了它（如果我这样做了，如果有人能指出我的意思，d就很好），但看起来你可以使用Promise来确保GoogleAuth实例已经准备就绪。这是我做了一个一致的结果：
Maybe I missed it in the documentation somewhere (if I did, it'd be nice if someone could point it out to me), but it looks like you can use Promises to make sure the GoogleAuth instance is ready. Here's what I did to get a consistent result:
gapi.load('auth2', function() {
gapi.auth2.init({
client_id: 'my_client_info.apps.googleusercontent.com',
}).then(function(){
auth2 = gapi.auth2.getAuthInstance();
console.log(auth2.isSignedIn.get()); //now this always returns correctly
});
});
这篇关于Google Sign In API：isSignedIn.get（）返回不一致的值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！