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JS Basic 10-dom Access HTML method

Source: Internet
Author: User
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First, DOM

1.DOM isthe short name of the Document Object Model. When a Web page loads, you can convert the structured document into a tree of objects in memory.

to put it simply DOM is not a technology, but an idea to access structured documents. With the Dom model, we can Modify, delete, and add to the DOM tree to make the structured document dynamic.

a node in a DOM model--a document can be said to be a collection of nodes. There are 3 Types of nodes in the DOM model:

    1. ELEMENT nodes: Various tags are the names of these element nodes, such as <p>,<ul> , etc.
    2. Text nodes: Text nodes are always included inside the element node
    3. Attribute node: Typically used to decorate an element node is called an attribute node.

Second, how the DOM accesses HTML

Dom has two main ways of accessing HTML.

  2. according to ID access HTML element: Call the getElementById () method through the document object to find a unique The element of the id attribute value.  
  3. <title> Untitled document </title><style> </style> <script type= "Text/javascript" >functionShow () {varContent1=document.getelementbyid (' Son1 '). InnerText; varContent2=document.getelementbyid (' Grandson2 '). Value; varContent3=document.getelementbyid (' Grandson3 '). Value; varContent4=document.getelementsbyclassname (' Grandson4 '). Value; Alert (Content1+ "\ n" +content2+ "\ n" +content3+ "\ n" +content4); }    </script>The first way
  5. 2. Access with node relationships HTML element. The common properties and methods are as follows:

ParentNode

Returns the parent node of the current node

PreviousSibling

Returns the previous sibling node of the current node

NextSibling

Returns the next sibling node of the current node

ChildNodes

Returns all child nodes of the current node

FirstChild

Returns the first child node of the current node

LastChild

Returns the last child node of the current node

getElementsByTagName (TagName)

Returns all child nodes of the current node with the specified label name

 

<!doctype html>/*taking Zhao Liu as the reference material*/#n4 {color:red}</style>varCurrent=document.getelementbyid ("N4"); functionshowcontent (target) {alert (target.innerhtml); }    functionShowcount () {alert (document.getElementsByTagName ("Li"). length); }</script></body>The second way
JS Basic 10-dom Access HTML method

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