javascript - Firebase 身份验证返回空语句

Question

当 firebase-authentication 在成功创建用户注册期间返回 null 语句时，我如何设法在条件下执行语句..

firebase.auth().createUserWithEmailAndPassword(email, pass).catch(function(error) {

  var errorCode = error.code;
  var errorMessage = error.message;

  if(errorCode == "auth/email-already-in-use"){ //condition working
    alert(errorMessage);
  }
  else if(errorCode == null){ //this condition not working
    alert("Registration Successfully");
  }
  else{  //condition working
    alert("Weak Password");
  }

});

Answer 1

如果你开始新的事件，你必须检查谁是当前用户，如果用户可用，你可以像这样开始第二个事件

 auth = FirebaseAuth.getInstance(); // Get Firebase auth instance

    if (auth.getCurrentUser() != null) {
        startActivity(new Intent(Login_Activity.this, SecondActivity.class));
        finish();
    }

如果有任何用户不可用，您必须根据需要将用户重定向到登录事件或用户创建事件

authListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();
            if (user == null) {

                // user auth state is changed - user is null
                // launch login activity

                startActivity(new Intent(secondActivity.this, Login_Activity.class));
                finish();
            }
        }
    };