IT技术 - Firebase 身份验证在尝试解决Promise时给我一个错误 - 吾爱随笔录

我需要有关此 Google 身份验证功能的帮助……我在 firebase.js (React) 中有一个方法 doCreateUserWithEmail 和密码，如下所示。

doCreateUserWithEmailAndPassword = (email, password) => {
 this.auth
  .createUserWithEmailAndPassword(email, password)
  .then(response => console.log(response))
  .catch(err => console.log(err));};

当我将 then .then 和下面的内容附加到 signUp.js 时，就像这样......

onSubmitHandler = event => {
event.preventDefault();
const { email, passwordOne } = this.state;
this.props.firebase.doCreateUserWithEmailAndPassword(email, passwordOne)
  .then(response => console.log(response))
  .catch(err => console.log(err));
this.props.history.push(ROUTES.HOME);

};

我收到这个错误..

TypeError: Cannot read property 'then' of undefined
SignUpFormBase._this.onSubmitHandler
src/components/signUp/signUp.js:31
 28 | onSubmitHandler = event => {
 29 |   event.preventDefault();
 30 |   const { email, passwordOne } = this.state;
 > 31 |   this.props.firebase.doCreateUserWithEmailAndPassword(email, 
 passwordOne)
 | ^  32 |     .then(response => console.log(response))
 33 |     .catch(err => console.log(err));
 34 |   this.props.history.push(ROUTES.HOME);
 View compiled

是的，当我收到错误消息时，我将它从 doCreateUserWithEmailAndPassword 中删除了..但该函数确实在 Firebase 中成功注册了用户，如果我拿走 .then 和 .catch 它工作正常。

为什么会出现此错误？