是不是调用前没有再次open?看了下MSDN,如下解释:
Important note Important
You cannot call multiple send methods for a single open method. Instead, for each send method, you must call a corresponding open method. For example:
osrvXmlHttp.open()
osrvXmlHttp.send()
osrvXmlHttp.open()
osrvXmlHttp.send()