到底怎么回事啊，是微软弄的吗，还是google 啊，还是哪个浏览器公司啊 The concept behind the XMLHttpRequest object was originally created by the developers of Outlook Web Access for Microsoft Exchange Server 2000.[4] An interface called IXMLHTTPRequest was developed and implemented into the second version of the MSXML library using this concept.[4][5] The second version of the MSXML library was shipped with Internet Explorer 5.0 in March of 1999, allowing access, via ActiveX, to the IXMLHTTPRequest interface using the XMLHTTP wrapper of the MSXML library http://en.wikipedia.org/wiki/XMLHttpRequest
