该类为服务器和产生的响应提供后台通信通道。

This class provides a background communication channel to a server and for the resulting response.

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可以使用现在的浏览器提供的XmlHttpRequest或等效对象进行此异步后台通信。

You use the XmlHttpRequest or equivalent object that modern browsers provide for this asynchronous background communication.

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完成了系统中语音数据和海量地图数据的存储、地图显示的优化、语音同步播报、后台通信服务等关键技术。

The kernel of this paper is to discuss the key technology of publication and interactive browsing for massive terrain data.

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