XMLDOM及XMLHTTP学习手册

XMLDOM学习笔记

　　XMLDOM是用来访问和操作XML文档的编程接口规范。

　　1、简介
　　XMLDOM被设计为可用于任何语言和任何操作系统。借助DOM，程序员可以创建XML文档、遍历其结构，增、改、删其元素。DOM将整个XML文档视作一棵树，文档级的元素是树的根。

　　2、MS的XML解析，IE5.0以上。
　　是一个COM组件，至少包含下列对象：
　　（1）Micosoft.XMLDOM
　　（2）Micosoft.XMLDOM.parseError，有如下属性：

Property	Description
errorCode	Returns a long integer error code

reason	Returns a string explaining the reason for the error
line	Returns a long integer representing the line number for the error
linePos	Returns a long integer representing the line position for the error
srcText	Returns a string containing the line that caused the error
url	Returns the url pointing the loaded document
filePos	Returns a long integer file position of the error

　　（3）Microsoft.XMLHTTP，有如下属性：

Property	Description
readyState	Returns the state of the document
responseBody	Returns the response as an array of unsigned bytes
responseStream	Returns the response as an IStream
responseText	Returns the response as a string
responseXML	Returns the response as an xml document
status	Returns the status code as a number
statusText	Returns the status as a string

有如下方法：

Property	Description
abort()	Cancel the current http request
getAllResponseHeaders()	Returns the value of the http headers
getResponseHeader(headerName)	Returns the value of one specified http header
open(method, url, async, userid, password)	Opens http request, and specifies the information
send()	Send?the http request to the server
setRequestHeader(headerName,headerValue)	Specifies the name of a http header

　　（4）Node的类型

nodeType	Named Constant	nodeTypeString	nodeName	nodeValue
1	ELEMENT_NODE	element	tagName	null
2	ATTRIBUTE_NODE	attribute	name	value
3	TEXT_NODE	text	#text	content of node
4	CDATA_SECTION_NODE	cdatasection	#cdata-section	content of node
5	ENTITY_REFERENCE_NODE	entityreference	entity reference name	null
6	ENTITY_NODE	entity	entity name	null

7	PROCESSING_INSTRUCTION_NODE	processinginstruction	target	content of node
8	COMMENT_NODE	comment	#comment	comment text
9	DOCUMENT_NODE	document	#document	null
10	DOCUMENT_TYPE_NODE	documenttype	doctype name	null
11	DOCUMENT_FRAGMENT_NODE	documentfragment	#document fragment	null
12	NOTATION_NODE	notation	notation name	null

　　W3C规定的属性：

Property	Description
attributes	Returns a NamedNodeMap containing all attributes for this node
childNodes	Returns a NodeList containing all the child nodes for this node
firstChild	Returns the first child node for this node
lastChild	Returns the last child node for this node
nextSibling	Returns the next sibling node. Two nodes are siblings if they have the same parent node
nodeName	Returns the nodeName, depending on the type
nodeType	Returns the nodeType as a number
nodeValue	Returns, or sets, the value of this node, depending on the type
ownerDocument	Returns the root node of the document
parentNode	Returns the parent node for this node
previousSibling	Returns the previous sibling node. Two nodes are siblings if they have the same parent node

　　W3C规定的方法：

Method	Description
appendChild(newChild)	Appends the node newChild at the end of the child nodes for this node
cloneNode(boolean)	Returns an exact clone of this node. If the boolean value is set to true, the cloned node contains all the child nodes as well
hasChildNodes()	Returns true if this node has any child nodes
insertBefore(newNode,refNode)	Inserts a new node, newNode, before the existing node, refNode
removeChild(nodeName)	Removes the specified node, nodeName
replaceChild(newNode,oldNode)	Replaces the oldNode, with the newNode

　　（5）NodeList的W3C规定的属性和方法。

Property	Description
length	Returns the number of nodes in a nodeList

Method	Description
item	Returns a specific node in the nodeList