Related properties of node in JavaScript

1,childnodes

The ChildNodes property returns an array that contains the entire child elements of the given element node.

Retrieves the first child node of a BODY element:

var body_element=document.getelementbytagname ("Body") [0];

The BODY element has several child elements

var body_element_length=body_element.lchildnodes.length;

2,notetype

Retrieving the type of a node

alert (Body_element.notetype);

There are 12 types of notetype, but only three are of practical value: element node (attribute value 1), Attribute node (property value 2), text node (property value 3)

3,nodevalue

If you want to change the value of a text node, use the NodeValue property to retrieve and set the value of the node: Node.nodevalue

For example, retrieving <p id= "description" > the text value inside the,<p> element of the NodeValue attribute is a null value, the text contained in the <p> element is another node, is the first child node of the <p> element

alert (Description.childnodes[0].nodevalue);

4,firstchild

Represents the first element of a childnodes[] array, childnodes[0] is equivalent to FirstChild

5,lastchild

Represents the last element of the childnodes[] array, lastchild equivalent to childnodes[node.childnodes.length-1]

Related properties of node in JavaScript