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Dom operations some commonly used attribute rollup _javascript tips

Source: Internet
Author: User
Tags object model
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1.DOM: Document Object Model DOM defines the standard way to access and process HTML documents. The DOM renders an HTML document as a tree structure (a node tree) with elements, attributes, and text.

Some of the commonly used properties of 2.DOM

　　2.1 Getting elements by ID

(1) Syntax:

Copy Code code as follows:

document.getElementById ("id");

(2) Function: ID on a person's ID, we can find the ID of the tag to find the label, and then do the appropriate operation.

(3) Note: Don't forget to write document!

　　2.2 innerHTML Properties

(1) Syntax:

Copy Code code as follows:

Obgect.innerhtml= "Hello World"

(2) Function: mainly to the contents of the label to get or replace

(3) Examples:

Copy Code code as follows:

<! DOCTYPE html>
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title>innerHTML</title>
<body>

<p> JavaScript is an object-based, event-driven simple scripting language, embedded in the HTML document, the browser is responsible for interpretation and execution, on the Web page to produce dynamic display effects and user interaction functions. </p>
<script type= "Text/javascript" >
var Mychar=document.getelementbyid ("Con");
document.write ("original title:" +mychar.innerhtml+ "<br>"); Output original H2 label content
Mychar.innerhtml= "Hello world!";
document.write ("Revised title:" +mychar.innerhtml); H2 label content after output modification
</script>
</body>

(4) Note: object is an element object that gets, such as an element obtained by document.getElementById ("ID").

　　2.3 Changing the HTML style

(1) Syntax:

Copy Code code as follows:

Object.style.property

(2) Role: for modifying HTML styles

(3) Examples:

Copy Code code as follows:

<body>

<p> JavaScript enables Web pages to display dynamic effects and interact with users. </p>
<script type= "Text/javascript" >
var mychar= document.getelementbyid ("con");
Mychar.style.color= "Red";
Mychar.style.backgroundcolor= "#ccc";
Mychar.style.width= "300px";
</script>
</body>

(4) Note: The property has a lot of styles, such as color,height and so on can be modified in this way, in one is not to forget the attribute after all to add a semicolon.

　　2.4 Show and hide (display property)

(1) Syntax:

Object.style.display=value
(2) Function: The Web page often see display and hidden, is to use display properties to achieve

(3) Examples:

Copy Code code as follows:

<script type= "Text/javascript" >
function HideText ()
{
var MyChar = document.getElementById ("con");
Mychar.style.display= "None";
}
function Showtext ()
{
var MyChar = document.getElementById ("con");
mychar.style.display= "Block";
}
</script>

(4) Note: value is none and block, none of which does not display content, and block is displayed

　　2.5 ClassName Properties

(1) Syntax:

Copy Code code as follows:

Object.classname=classname

(2) Function: 1. Gets the class attribute of the element; 2. Specify a CSS style for an element in the Web page to change the appearance of the modified element

(3) Examples:

Copy Code code as follows:

<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 ">
<title>classname Properties </title>
<style>
body{font-size:16px;}
. one{
border:1px solid #eee;
width:230px;
height:50px;
Background: #ccc;
color:red;
}
. two{
border:1px solid #ccc;
width:230px;
height:50px;
Background: #9CF;
Color:blue;
}
</style>
<body>
<p id= "P1" > JavaScript enables Web pages to display dynamic effects and interact with users. </p>
<input type= "button" value= "Add Style" onclick= ' Add () '/>
<p id= "P2" class= "one" >javascript enables Web pages to display dynamic effects and interact with users. </p>
<input type= "button" value= "Change Appearance" onclick= "Modify ()"/>
<script type= "Text/javascript" >
function Add () {
var P1 = document.getElementById ("P1");
P1.classname= "one";
}
function Modify () {
var P2 = document.getElementById ("P2");
P2.classname= "two";
}
</script>
</body>

The above is the entire content of this article, I hope you can enjoy.

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