Firebase：.priority值 [英] Firebase: .priority value

问题描述

• 如何检查.priority值是否在我的Forge中？


• 根据文档，较小的.priority值在较大的.priority值。如果我使用自纪元以来的秒数作为优先级，并且我希望最新的孩子出现在最前面，我应该设置.priority为1 /秒吗？
  
  
  

• How do I check the .priority values are in my "Forge"?
• According to docs, smaller .priority value comes before larger .priority value. If I use seconds since epoch for priority, and I want the latest children to show up on top, should I set .priority to be 1/seconds?

接下来是有数字的孩子。它们按照优先级（小到大）进行数字排序，然后按名称（a到z）按字母顺序排序。

Children with a number as their priority come next. They are sorted numerically by priority (small to large) and then lexicographically by name (a to z).

• 从实验来看，如果我将.priority设置为java.util.Date＃getTime，那么在我的Forge中最老的孩子显示在最上面，但是当我使用排序时，最新的孩子显示在我的Javascript on prevChildName。为什么是这样？
  
  
  • From experimentation, I've determined that if I set .priority to java.util.Date#getTime, oldest children show up on top in my Forge, but latest children show up on top in my Javascript on() when ranking using prevChildName. Why is this?

  推荐答案

  使用
  
  

  use

  snapshot.getPriority();
  

  more at
  https://www.firebase.com/docs/javascript/firebase/setwithpriority.html

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