XML DOM - 的 节点对象
节点对象
Node 对象表示文档树中的单个节点。
节点可以是元素节点、属性节点、文本节点或任何其他在节点类型章节。
请注意，虽然所有对象都继承 Node 属性/方法来处理父级和子级，但并非所有对象都可以有父级或子级。例如，文本节点可能没有子节点，向此类节点添加子节点会导致 DOM 错误。
节点对象属性
| Property | Description |
|---|---|
| attributes | A NamedNodeMap containing the attributes of this node (if it is an Element) |
| baseURI | Returns the absolute base URI of a node |
| childNodes | Returns a NodeList of child nodes for a node |
| firstChild | Returns the first child of a node |
| lastChild | Returns the last child of a node |
| nextSibling | Returns the node immediately following a node |
| nodeName | Returns the name of a node, depending on its type |
| nodeType | Returns the type of a node |
| nodeValue | Sets or returns the value of a node, depending on its type |
| ownerDocument | Returns the root element (document object) for a node |
| parentNode | Returns the parent node of a node |
| prefix | Sets or returns the namespace prefix of a node |
| previousSibling | Returns the node immediately before a node |
| textContent | Sets or returns the textual content of a node and its descendants |
节点对象方法
| Method | Description |
|---|---|
| appendChild() | Appends a new child node to the end of the list of children of a node |
| cloneNode() | Clones a node |
| compareDocumentPosition() | Compares the placement of two nodes in the DOM hierarchy (document) |
| getFeature(feature,version) | Returns a DOM object which implements the specialized APIs of the specified feature and version |
| getUserData(key) | Returns the object associated to a key on a this node. The object must first have been set to this node by calling setUserData with the same key |
| hasAttributes() | Returns true if the specified node has any attributes, otherwise false |
| hasChildNodes() | Returns true if the specified node has any child nodes, otherwise false |
| insertBefore() | Inserts a new child node before an existing child node |
| isDefaultNamespace(URI) | Returns whether the specified namespaceURI is the default |
| isEqualNode() | Tests whether two nodes are equal |
| isSameNode() | Tests whether the two nodes are the same node |
| lookupNamespaceURI() | Returns the namespace URI associated with a given prefix |
| lookupPrefix() | Returns the prefix associated with a given namespace URI |
| normalize() | Puts all Text nodes underneath a node (including attribute nodes) into a "normal" form where only structure (e.g., elements, comments, processing instructions, CDATA sections, and entity references) separates Text nodes, i.e., there are neither adjacent Text nodes nor empty Text nodes |
| removeChild() | Removes a specified child node from the current node |
| replaceChild() | Replaces a child node with a new node |
| setUserData(key,data,handler) | Associates an object to a key on a node |
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