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 |
| 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 |