While responseText returns the HTTP response as a string, responseXML returns the response as XML responseText”属性以字符串形式返回HTTP响应；“ responseXML”属性以XML形式返回HTTP响应。

The ResponseXML property returns an XML document object, which can be examined and parsed using W3C DOM node tree methods and properties.
“responseXML”属性返回了一份XML文档对象，可以使用W3C DOM节点树方法和属性对该XML文档对象进行检查和解析。