javascript - 如何连接到 Firebase Firestore？

Question

我想从 Firestore 数据库中获取数据，但是，我得到的不是 1 个元素的数组，而是 [Al]，我不确定它是什么。

这是我在 Index.html 中的代码。出于安全原因，我在这里更改了配置对象中的信息。

<!-- The core Firebase JS SDK is always required and must be listed first -->
<script src="https://www.gstatic.com/firebasejs/7.14.5/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/7.14.5/firebase-firestore.js"></script>

<!-- TODO: Add SDKs for Firebase products that you want to use
     https://firebase.google.com/docs/web/setup#available-libraries -->
<script src="https://www.gstatic.com/firebasejs/7.14.5/firebase-analytics.js"></script>

<script>
  // Your web app's Firebase configuration
  var firebaseConfig = {
    apiKey: "my api key",
    authDomain: "demo",
    databaseURL: "my url",
    projectId: "my project",
    storageBucket: "bucket",
    messagingSenderId: "1051539927876",
    appId: "my app id",
    measurementId: "0000000000"
  };
  // Initialize Firebase
  firebase.initializeApp(firebaseConfig);
  var db = firebase.firestore();
  firebase.analytics();
</script>

<script src="app.js"></script>

这就是我在 app.js 文件中的内容

db.collection('cafes').get().then((snapshot) => {
  console.log(snapshot.docs);
}).catch(err => {
  console.log(err);
});

Answer 1

您需要执行以下操作来获取数据:

db.collection('cafes').get().then((snapshot) => {
 snapshot.forEach((doc) => {
 console.log(doc.id, " => ", doc.data());
 });
}).catch(err => {
  console.log(err);
});

doc.data()将包含文件的数据。

https://firebase.google.com/docs/firestore/query-data/get-data#get_all_documents_in_a_collection