问题：Firebase: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp() (app/n

困惑了一下午的错误，怎么都无法解决： Firebase: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp() (app/no-app). 后来，意外留意到控制台给出的警告，仔细读了几遍 Warning: Firebase is already defined in the global s

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