javascript - Angular2 对异步/等待的 promise

Question

如何转换此代码 (Promise):

registerUser(formData) {
    firebase.auth().createUserWithEmailAndPassword(formData.email,formData.passwords.password)
            .then((user) => {
                firebase.database().ref(`/users/${user.uid}`).set({
                    id: user.uid,
                    email: formData.email
                })
                this.routing.navigate(['/login']);
            }).catch((error) => {
                console.log(error); 
            })
}

进入这个(异步/等待):

async registerUser(formData){
    try{
        await firebase.auth().createUserWithEmailAndPassword(formData.email,formData.passwords.password);
        firebase.database().ref(`/users/${user.uid}`)
            .set({id: user.uid,email: formData.email});
        this.routing.navigate(['/login']);
        return true;
    }catch(error){
        return false;
    }
}

如何获取user.uid(即注册用户uid)？在 promise 中它是如此简单，因为我只需要将参数(用户)传递给 then。 谢谢，求助:)

Answer 1

How can I get user.uid...

user是由await表达式返回的，所以添加let user =(或const user =)在它前面:

async registerUser(formData){
    try{
        const user = await firebase.auth().createUserWithEmailAndPassword(formData.email,formData.passwords.password);
    //  ^^^^^^^^^^^^^
        firebase.database().ref(`/users/${user.uid}`)
            .set({id: user.uid,email: formData.email});
        this.routing.navigate(['/login']);
        return true;
    }catch(error){
        return false;
    }
}