javascript - Firebase get length of object / number of children in object

Question

Is there a way to get the number of children of an object without downloading the entire object? From what I understand using numChildren would first download the entire object, would it not?

Answer 1

是的，目前会。当前无法在不下载整个对象的情况下获取子对象的数量（尽管它可能是将来添加的功能）。

作为一种解决方法，您可以尝试将长度存储在 Firebase 中的单独位置（并在添加或删除子项时更新其值）。