[問題] 實做聊天室 get userlist every 1 second
請問如何每隔一秒, 自動用 Ajax 偵測目前在線人次?
因為有些人離線可能是因為網路突然斷掉害的,
如果是用 onunload 之後丟個 send() 叫 php 清 session,
就沒辦法避免這種狀況了。
所以得用使用者固定丟某種訊息告訴 server "我還在" 才行
請問有什麼想法嗎?
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