来自节点的Firebase：回调没有响应？

节点的Firebase：回调没有响应？"/>

来自节点的Firebase：回调没有响应？

我正在尝试让Hello World在这里工作-只需让我的Node脚本与Firebase对话即可。我制作了一个脚本，认为应该阅读“故事”集合，但是Firebase没有任何响应。我确定我缺少了一些难以置信的基本知识。请帮助！

var db = admin.database();
var ref = db.ref("stories");

ref.on("value", function(snapshot) {
  console.log(snapshot.val());
}, function (errorObject) {
  console.log("The read failed: " + errorObject.code);
});
console.log('exiting');

...但是我得到的是：

p:0: Browser went online.
p:0: Listen called for /stories default
exiting
p:0: Making a connection attempt
p:0: Auth token refreshed
getToken() completed. Creating connection.
c:0:0: Connection created
c:0:0:0 Websocket connecting to wss://*****.firebaseio/.ws?v=5

我想办法等待更长的时间，得到了：

p:0: Browser went online.
p:0: Listen called for /stories default
exiting
p:0: Making a connection attempt
p:0: Auth token refreshed
getToken() completed. Creating connection.
c:0:0: Connection created
c:0:0:0 Websocket connecting to wss://*****.firebaseio/.ws?v=5
c:0:0: Closing unhealthy connection after timeout.
c:0:0: Closing realtime connection.
c:0:0: Shutting down all connections
c:0:0:0 WebSocket is being closed
p:0: data client disconnected
p:0: Trying to reconnect in 0ms
0: onDisconnectEvents
p:0: Making a connection attempt
getToken() completed. Creating connection.
c:0:1: Connection created
c:0:1:0 Websocket connecting to wss://*****.firebaseio/.ws?v=5
c:0:0:0 Websocket connection was disconnected.

我在做什么错？

通过once()而不是on()。 once()仅查询一次并返回承诺。 on()建立一个监听器，该监听器将一直运行直到您将其删除为止，并且它不会返回承诺。

ref.once('value')
.then(snapshot => {
    console.log(snapshot.val());
})
.catch(error => {
    console.error(error);
});