从child_removed firebase事件中获取已删除项的密钥

Question

是否可以在Firbase的on('child_removed')回调函数中检索已删除子项的键的键？

Answer 1

从Firebase文档中on('value':

每次移除孩子时都会触发此事件一次.传递给回调的DataSnapshot将是已删除子项的旧数据.

firebaseRef.on('child_removed', function(oldChildSnapshot) {
  console.log('Child '+oldChildSnapshot.key()+' was removed');
});