xmlHttpRequest对象XHR请求一个页面时，需要对该页面进行判断 在firefox中XHR.responseXML有如下属性 nodeName nodeValue nodeType parentNode childNodes firstChild lastChild previousSibling nextSibling attributes ownerDocument insertBefore replaceChild removeChild appendChild hasChildNodes cloneNode normalize isSupported namespaceURI prefix localName hasAttributes doctype implementation documentElement createElement createDocumentFragment createTextNode createComment createCDATASection createProcessingInstruction createAttribute createEntityReference getElementsByTagName importNode createElementNS createAttributeNS getElementsByTagNameNS getElementById ELEMENT_NODE ATTRIBUTE_NODE TEXT_NODE CDATA_SECTION_NODE ENTITY_REFERENCE_NODE ENTITY_NODE PROCESSING_INSTRUCTION_NODE COMMENT_NODE DOCUMENT_NODE DOCUMENT_TYPE_NODE DOCUMENT_FRAGMENT_NODE NOTATION_NODE async [...]
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