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Everything in the HTML document is a node !
The entire document is a document node;
Note is a comment node;
Each HTML element is an element node;
The text content within the element is a text node;
Each property of a hyphen element is an attribute node.
It feels familiar to see these things, right, just like everything in JS is an object, everything in the HTML document is a node.
We can use a variety of access nodes to the method of any one of the nodes, such as pruning and checking operations. To achieve a variety of operations on the entire page.
Increase :
If you want to add an element to HTML, you need to first create an element (the element node) and then append it to the existing element.
To create an element node NewNode:
var newNode = document.createelement (String tagName)
To create a text node within an element:
var textnode = document.createTextNode (String data)
Add the text node Textnode to the newly created element node NewNode:
Newnode.appendchild (Textnode)
Add the newly created element node NewNode to the end of the existing element section OldNode point:
Oldnode.appendchild (NewNode)
Or add the newly created element node newnode to a child node of an existing element node OldNode before Childnode:
Oldnode.insertbefore (Newnode,childnode)
Example:
1<! DOCTYPE html>234<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>5<script src= "Jquery.js" ></script>6<script type= "Text/javascript" >7Window.onload =function(){8 varpp = document.createelement ("li");9 varHH1 = document.createelement ("H1");Ten varTtext = document.createTextNode ("This is the newly added element node!")); One Pp.appendchild (HH1); A Hh1.appendchild (ttext); - varull = document.getElementById ("ul"); - ull.appendchild (PP); the } -</script> -<style type= "Text/css" > - ul { + border:1px solid; - margin:100px Auto; + width:400px; Alist-style-Type:none; at } -</style> -<title>JS</title> - -<body> -<ul id= "ul" > in<li> -<li> to</ul> +</body> -Effect:
By deleting:
After finding the node that will be deleted Removenode and the parent node of the node parentnode
Parentnode.removechild (RemoveNode)
Example:
1<! DOCTYPE html>234<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>5<script src= "Jquery.js" ></script>6<script type= "Text/javascript" >7Window.onload =function(){8 varpp = document.createelement ("li");9 varHH1 = document.createelement ("H1");Ten varTtext = document.createTextNode ("This is the newly added element node!")); One Pp.appendchild (HH1); A Hh1.appendchild (ttext); - varull = document.getElementById ("ul"); - ull.appendchild (PP); the - varLi1 = document.getElementById ("Li1"); - Ull.removechild (LI1); - } +</script> -<style type= "Text/css" > + ul { A border:1px solid; at margin:100px Auto; - width:400px; -list-style-Type:none; - } -</style> -<title>JS</title> in -<body> to<ul id= "ul" > +<li id= "Li1" > -<li> the</ul> *</body> $Effect:
Change:
Find the element node that needs to be changed, and then change its text, style, and so on
Change its style:
Node.style.color= "Red"
Change its text:
Node.innerhtml= "string"
Instance:
1<! DOCTYPE html>234<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>5<script src= "Jquery.js" ></script>6<script type= "Text/javascript" >7Window.onload =function(){8 varpp = document.createelement ("li");9 varHH1 = document.createelement ("H1");Ten varTtext = document.createTextNode ("This is the newly added element node!")); One Pp.appendchild (HH1); A Hh1.appendchild (ttext); - varull = document.getElementById ("ul"); - ull.appendchild (PP); the - varLi1 = document.getElementById ("Li1"); - Ull.removechild (LI1); - + varLi2 = document.getElementById ("Li2"); -Li2.style.color= "Red"; +Li2.innerhtml= "changed the color and text of the second line! " A } at</script> -<style type= "Text/css" > - ul { - border:1px solid; - margin:100px Auto; - width:400px; inlist-style-Type:none; - } to</style> +<title>JS</title> - the<body> *<ul id= "ul" > $<li id= "Li1" >Panax Notoginseng<li id= "Li2" > -</ul> the</body> +Effect:
Check:
In addition to using getElementById (), getElementsByTagName (), and Getelementclassname () to get a specific element node, we can also use the getattribute (String attribute) to get the value of a property of a particular element node and change the value of the property by SetAttribute (Attrname,attrvalue).
Instance:
1<script type= "Text/javascript" >2Window.onload =function(){3 varpp = document.createelement ("li");4 varHH1 = document.createelement ("H1");5 varTtext = document.createTextNode ("This is the newly added element node!"));6 Pp.appendchild (HH1);7 Hh1.appendchild (ttext);8 varull = document.getElementById ("ul");9 ull.appendchild (PP);Ten One varLi1 = document.getElementById ("Li1"); A Ull.removechild (LI1); - - varLi2 = document.getElementById ("Li2"); theLi2.style.color= "Red"; -Li2.innerhtml= "changed the color and text of the second line! " - -Alert (Li2.getattribute ("style")));19 } -</script>Effect:
In addition, we can get more information about a node through the nodename, NodeType, and NodeValue of a node:
The NodeName attribute specifies the name of the node:
Note: NodeName always contains the uppercase label name of an HTML element.
The NodeValue property specifies the value of the node:
The NodeValue property specifies the value of the node:
Javascript DOM node
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