将用户信息添加到firebase(注册)react native

你在正确的轨道上。你只需要把名字和姓氏连在一起。

您可以使用+作为可以添加的字符串或使用字符串插值(这更优雅)。

// adding strings 
const username = state.firstName + '.' + state.lastName;

// using string interpolation.
// here, you use the backtick character (`), it is usually found below escape.
// then use ${variable} to interpolate variable.
const username = `${state.firstName}.${state.lastName}`;

(because setDoc returns a promise) . 我还通过对象分解使代码更加优雅。

createUserWithEmailAndPassword(auth, state.email, state.password) 
 .then(async (userCredential) => {
    const { address, email, firstName, lastName } = state;
    const username = `${firstName}.${lastName}`;
    await setDoc(
      doc(db, 'users', userCredential.user.uid), 
      { address, email, firstName, lastName, username },
    );
 });