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Understanding of ELEMENT nodes, attribute nodes, text nodes in the DOM 13.3

Source: Internet
Author: User
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Node information

Each node has properties that contain some information about the node. These properties are:
NodeName (node name)
NodeValue (node value)
NodeType (node type)
NodeType

The NodeType property returns the type of the node.

The most important node types are:

Element type

Node type

Element (Element_node)

1

Properties (Attribute_node)

2

Text (Text_node)

3

Note (comment_node)

8

Document (Document_node)

9

In the actual application, is often used is the element node, attribute node and text node, below we through the small section code to explain

1: Element node
ELEMENT Node code

  2. <HTML>
  4. <HEAD>
  6. <title> Empty Valley leisurely </title>
  8. </HEAD>
  10. <BODY>
  12. <table>
  14. <tr>
  16. <TD Id="John" name="myname">john</td>
  18. <TD>doe</td>
  20. <TD Id="Jack">jack</td>
  22. </tr>
  24. </Table>
  26. <script>
  28. var d = document.getElementById ("John");
  30. Alert (D.nodetype)
  32. Alert (D.nodename)
  34. Alert (D.nodevalue)
  36. </Script>
  38. </BODY>
  40. </HTML>


Analyze the result of the run with the values of the three properties:

Nodetype:element_node

NodeType Value: 1

NodeName: Element tag name//here is TD

Nodevalue:null

2: Attribute node


Attribute Node code

  2. <HTML>
  4. <HEAD>
  6. <title> Empty Valley leisurely </title>
  8. </HEAD>
  10. <BODY>
  12. <table>
  14. <tr>
  16. <TD Id="John" name="myname">john</td>
  18. <TD>doe</td>
  20. <TD Id="Jack">jack</td>
  22. </tr>
  24. </Table>
  26. <script>
  28. var d = document.getElementById ("John"). GetAttributeNode ("name");
  30. Alert (D.nodetype)
  32. Alert (D.nodename)
  34. Alert (D.nodevalue)
  36. </Script>
  38. </BODY>
  40. </HTML>


Analyze the result of the run with the values of the three properties:

Nodetype:attribute_node

NodeType Value: 2

NodeName: Attribute name//name

NodeValue: Attribute value//myname

3: Text node


Text Node code

  2. <HTML>
  4. <HEAD>
  6. <title>new Document</title>
  8. </HEAD>
  10. <BODY>
  12. <table>
  14. <tr>
  16. <TD Id="John" name="myname">john</td>
  18. <TD>doe</td>
  20. <TD Id="Jack">jack</td>
  22. </tr>
  24. </Table>
  26. <script>
  28. var d = document.getelementsbytagname ("TD") [0].firstchild
  30. Alert (D.nodetype)
  32. Alert (D.nodename)
  34. Alert (D.nodevalue)
  36. </Script>
  38. </BODY>
  40. </HTML>


Analyze the result of the run with the values of the three properties:

Nodetype:text_node

NodeType Value: 3

NodeName: #text

NodeValue: Text content//John

Understanding of ELEMENT nodes, attribute nodes, text nodes in the DOM 13.3

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