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Firebase javascript身份验证-错误：“未捕获引用错误：未定义Firebase”_Javascript_Firebase_Error Handling_Firebase Authentication - Fatal编程技术网
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Firebase javascript身份验证-错误：“未捕获引用错误：未定义Firebase”

javascript firebase error-handling

Firebase javascript身份验证-错误：“未捕获引用错误：未定义Firebase”,javascript,firebase,error-handling,firebase-authentication,Javascript,Firebase,Error Handling,Firebase Authentication,这是我写的有问题的代码 firebase.auth().onAuthStateChange(firebaseUser => { if(firebaseUser) { console.log(firebaseUser); } else {console.log('not logged in'); } 是的，我已更改了Firebase的脚本请尝试将其包含在html中。Firebase是如何定义的？

这是我写的有问题的代码

firebase.auth().onAuthStateChange(firebaseUser => {
  if(firebaseUser) {
   console.log(firebaseUser);
   } else {console.log('not logged in');
}
是的，我已更改了Firebase的脚本

请尝试将其包含在html中。

Firebase是如何定义的？