无法将数据保存在Firebase数据库中-React Native

Question

我已经在项目中安装并导入了Firebase，代码如下：

componentWillMount(){
  var config = {
    apiKey: "***************************",
    authDomain: "configuracaofirebase-3a6ef.firebaseapp.com",
    databaseURL: "https://configuracaofirebase-3a6ef.firebaseio.com",
    projectId: "configuracaofirebase-3a6ef",
    storageBucket: "configuracaofirebase-3a6ef.appspot.com",
    messagingSenderId: "939162871117"
  };

  firebase.initializeApp(config);
}

salvarDados(){
  var database = firebase.database();
  database.ref("pontuacao").set("100");
}

render() {
  return (
    <View style={styles.container}>
      <Button 
        onPress={ () => { this.salvarDados() } }
        title="Salvar dados"
        color="#841584"
        accessibilityLabel="Salvar dados"
      />
      <Text>Meu App</Text>
    </View>
  );
}

当我调用“ salvarDados”方法时不起作用

显示此错误：

typeError: undifined is not a function (evaluating '_app.default.database()')

Answer 1

我通过添加一个新的导入来解决了这个问题：

import firebase from '@firebase/app';
import '@firebase/database';

Answer 2

尝试删除函数调用周围的{}：

onPress={ () => { this.salvarDados() } 

将成为：

onPress={ () => this.salvarDados() }