检索父ID未知的孩子的数据-Firebase [英] Retrieve data of child of unknown parent ID - Firebase

问题描述

我有一个Firebase数据库，如图所示.

I have a Firebase database like shown in the image.

我希望所有数据以绿色突出显示.但是我不知道用红色突出显示的键.

I want to get all the data highlighted in GREEN. But I don't know keys highlighted in RED.

这应该是什么JavaScript代码?

What should be the JavaScript Code for this?

谢谢.

推荐答案

这将记录所有电话号码:

This would log all phone numbers:

var usersRef = firebase.database().ref("users");
usersRef.on("child_added", function(snapshot) {
    console.log(snapshot.child("phoneno").val());
});

请注意，Firebase 文档和

Note that the Firebase documentation and Codelab cover this and a lot more. I highly recommend you spend some time on those, to become more familiar with Firebase.

如果您要一次打印所有电话号码，可以执行以下操作:

If you want to print all phone numbers once, you can do so with:

var usersRef = firebase.database().ref("users");
usersRef.once("value", function(snapshot) {
  snapshot.forEach(function(userSnapshot) {
    console.log(userSnapshot.child("phoneno").val());
  });
});

侦听以下文档对数据集合进行事件评估.

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