XML DOM - 的 元素对象
元素对象
Element 对象表示 XML 文档中的元素。元素可以包含属性、其他元素或文本。如果元素包含文本，则该文本在文本节点中表示。
重要的！文本始终存储在文本节点中。 DOM 处理中的一个常见错误是导航到元素节点并期望它包含文本。然而，即使是最简单的元素节点下面也有一个文本节点。例如，在<year>2005</year>中，有一个元素节点（年份），其下有一个文本节点，其中包含文本（2005）。
因为Element对象也是一个Node，所以它继承了Node对象的属性和方法。
元素对象属性
| Property | Description |
|---|---|
| attributes | Returns a NamedNodeMap of attributes for the element |
| baseURI | Returns the absolute base URI of the element |
| childNodes | Returns a NodeList of child nodes for the element |
| firstChild | Returns the first child of the element |
| lastChild | Returns the last child of the element |
| localName | Returns the local part of the name of the element |
| namespaceURI | Returns the namespace URI of the element |
| nextSibling | Returns the node immediately following the element |
| nodeName | Returns the name of the node, depending on its type |
| nodeType | Returns the type of the node |
| ownerDocument | Returns the root element (document object) for an element |
| parentNode | Returns the parent node of the element |
| prefix | Sets or returns the namespace prefix of the element |
| previousSibling | Returns the node immediately before the element |
| schemaTypeInfo | Returns the type information associated with the element |
| tagName | Returns the name of the element |
| textContent | Sets or returns the text content of the element and its descendants |
元素对象方法
| Method | Description |
|---|---|
| appendChild() | Adds a new child node to the end of the list of children of the node |
| cloneNode() | Clones a node |
| compareDocumentPosition() | Compares the document position of two nodes |
| getAttribute() | Returns the value of an attribute |
| getAttributeNS() | Returns the value of an attribute (with a namespace) |
| getAttributeNode() | Returns an attribute node as an Attribute object |
| getAttributeNodeNS() | Returns an attribute node (with a namespace) as an Attribute object |
| getElementsByTagName() | Returns a NodeList of matching element nodes, and their children |
| getElementsByTagNameNS() | Returns a NodeList of matching element nodes (with a namespace), and their children |
| 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 |
| hasAttribute() | Returns whether an element has any attributes matching a specified name |
| hasAttributeNS() | Returns whether an element has any attributes matching a specified name and namespace |
| hasAttributes() | Returns whether the element has any attributes |
| hasChildNodes() | Returns whether the element has any child nodes |
| insertBefore() | Inserts a new child node before an existing child node |
| isDefaultNamespace(URI) | Returns whether the specified namespaceURI is the default |
| isEqualNode() | Checks if two nodes are equal |
| lookupNamespaceURI() | Returns the namespace URI matching a specified prefix |
| lookupPrefix() | Returns the prefix matching a specified namespace URI |
| normalize() | Puts all text nodes underneath this element (including attributes) 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 |
| removeAttribute() | Removes a specified attribute |
| removeAttributeNS() | Removes a specified attribute (with a namespace) |
| removeAttributeNode() | Removes a specified attribute node |
| removeChild() | Removes a child node |
| replaceChild() | Replaces a child node |
| setUserData(key,data,handler) | Associates an object to a key on the element |
| setAttribute() | Adds a new attribute |
| setAttributeNS() | Adds a new attribute (with a namespace) |
| setAttributeNode() | Adds a new attribute node |
| setAttributeNodeNS(attrnode) | Adds a new attribute node (with a namespace) |
| setIdAttribute(name,isId) | If the isId property of the Attribute object is true, this method declares the specified attribute to be a user-determined ID attribute |
| setIdAttributeNS(uri,name,isId) | If the isId property of the Attribute object is true, this method declares the specified attribute (with a namespace) to be a user-determined ID attribute |
| setIdAttributeNode(idAttr,isId) | If the isId property of the Attribute object is true, this method declares the specified attribute to be a user-determined ID attribute |
截取页面反馈部分，让我们更快修复内容！也可以直接跳过填写反馈内容!