In Part 1 of this series, we introduced JSONP as an effective cross-domain communication technique, one that lets you bypass the same-origin policy limitations imposed by the current browsers.
在本系列的第1部分中，我们介绍了JSONP是一种有效的跨域通信技术，允许您绕过当前浏览器带来的同源策略限制。
However, users on dial-up might never be able to experience its real advantages, because in many cases, Ajax requires a lot of communication between browsers and servers.
然而，拨号用户可能从来没机会体验其真正的优势，因为在许多情形下，Ajax需要在浏览器与服务器之间大量通信。
Wireless Application protocol WAP - a communication protocol designed for wireless devices browsers.
无线应用协议(Wireless Applicationprotocol, WAp)—为无线设备浏览器设计的通信协议。
We use Socket.IO, which abstracts over websockets and provides fallbacks to support websocket-style communication for browsers that don’t have websockets yet.
我们使用Socket.IO，它对WebSocket进行了抽象，还对尚没有WebSocket的浏览器提供了应变方案，以支持WebSocket式的通信。
You use the XmlHttpRequest or equivalent object that modern browsers provide for this asynchronous background communication.
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.
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。
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