We have implemented a simple chat room feature in Rails using Simple Ajax updates. Now in every chat room a message belongs to particular user. We want to show the list of users(something like user presence). Please suggest ways. We are not using Jabber,XMPP etc. We have implemented a simple chat room feature
阅读背景：
用户在线聊天室（通过简单轮询更新聊天）
来源：互联网
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