如何将$ index observable“绑定”（存储）到我的observable中？(How to “bind” (store) the $index observable to my observable?)

 我有一个foreach绑定，在我的数据中我有一个名为Level的可观察对象。 我怎么能将$index值存储在我的Level observable中？ 我需要它，因为数组转到服务器端脚本，我不能指望订单将在最后保留。 
 
 我一直在谷歌搜索一段时间，但还没有找到任何相关的答案 

I have a foreach binding, and in my data I have an observable called Level. How could I store the $index value in my Level observable? I would need it because the array goes to a server-side script, and Icannot expect that the order will be preserved at the end.
 
I've been googling for a while now but haven't found any related answer yet 

原文：https://stackoverflow.com/questions/26059618