在传统的轮询方法中，客户机发送一个请求到服务器，然后总是可以收到一个即时响应(如果服务器有更新数据)或者一个“无可用数据”的响应。
In the traditional polling method, the client sends a request to the server and always either gets an immediate response if the server has any updated data, or a no-data-available response.
在传统的轮询方法中，客户机发送一个请求到服务器，然后总是可以收到一个即时响应(如果服务器有更新数据)或者一个“无可用数据”的响应。
In the traditional polling method, the client sends a request to the server and always either gets an immediate response if the server has any updated data, or a no-data-available response.
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