dwr实现的在线即时聊天demo,比较简化的一个反向ajax例子,<br><br>everse Ajax主要是在BS架构中，从服务器端向多个浏览器主动推数据的一种技术



。它的一种实现就是客户端向服务器请求后，服务器不立即回应，从而导致一个http长连接，等到有更新数据的时候，再利用这个连接“主动”向客户



端回送。-Online live chat implementation dwr demo, compare the simplified example of a reverse ajax, <br><br> everse Ajax mainly in the BS framework, from the server to push data in multiple browsers, a technology initiative. It' s a realization that the client request to the server, the server does not respond immediately, leading to a long http connection, waiting for the update data, then use this connection " active"　sent back to the client.