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並前往https://books.google.com.tw/books?id=mkFPDwAAQBAJ&pg=PA62&lpg=PA62&dq=onauthstatechanged&source=bl&ots=OVx-B-DXa5&sig=ACfU3U3c4T4AGF7M0PXOq3rNCnu_fxqDVw&hl=zh-TW&sa=X&ved=2ahUKEwiAo7n7oubzAhVYRjABHdutAGsQ6AF6BAgtEAM

Firebase Cookbook: Over 70 recipes to help you create ...

To do that we'll need to check the authentication state of the user, using the onAuthStateChanged event as shown in the following code: firebase.auth().

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