最通用的定义为：XmlHttp是一套可以在Javascr ipt、Vbscr ipt、Jscr ipt等脚本语言中通过http协议传送或从接收XML及其他数据的一套API。XmlHttp最大的用处是可以更新网页的部分内容而不需要刷新整个页面。

-The most common is defined as: XmlHttp is a set in Javascr ipt, Vbscr ipt, Jscr ipt scr ipting languages, such as through the http protocol to send or receive XML and other data set of API. XmlHttp usefulness is the largest part of the contents of web pages to update without having to refresh the entire page.