javascript绑定此未定义

Question

我正在尝试将“this”绑定到google firebase函数，但我无法在promise中获得此值。请检查下面的代码。

this.props.getUser.linkWithCredential(y)
                .then((response) => {
                    ***this.props.history.replace('/');***
                }).catch((error) => {
                switch (error.code) {
                    case 'auth/provider-already-linked':
                        this.setState({formError: 'already been linked to the user'});
                        break;
                    case 'auth/invalid-credential':
                        this.setState({formError: '(otp-03) Please contact customer service for more details.'});
                        break;
                    case 'auth/credential-already-in-use':
                        this.setState({formError: 'Mobile number is already linked with another account. Please contact customer service for more details.'});
                        break;
                    case 'auth/invalid-verification-code':
                        this.setState({formError: 'OTP code is wrong, Please enter the correct code.'});
                        break;
                    case 'auth/invalid-verification-id':
                        this.setState({formError: '(otp-04) Please contact customer service for more details.'});
                        break;
                    default:
                        this.setState({formError: '(otp-05) Please contact customer service for more details.'});
                }
            })

所以当调用时（this.props.history.replace（'/'）;）我对“这个”乳清无法发现我无法访问它？我怎么能在这里使用bind？