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Start studying Ajax. First day _ajax related

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Author: User
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Start studying Ajax. First day

First of all, I am not suitable for the study program of the person, also do not like, because I am very careless, every time will write a lot of code wrong. But out of love for Dom,js,css, I started to study Ajax.

What is Ajax?
I answer: First of all, the four components of Ajax are [XMLHTTPREQUEST],[JAVASCRIPT],[DOM],[CSS]. These four things are not explained for the moment. The effect of these four things is [XMLHttpRequest] is responsible for communicating with the Web server, [Javascript] controlling the page by controlling [DOM], [CSS] doing page retouching, and of course being controlled by the image. This is Ajax. What I understand.

Here is an example!
The Hello page of Ajax! Hello the world!

CODE:
[Copy to Clipboard]
<title>hello.the world</title>

<style type= "Text/css" ><!--
. declared {color:red; font-size:14px;}
. programmed {color:blue; font-size:12px; font-weight:bold;}
--></style>

<script>
Window.onload=function () {
var hello=document.getelementbyid (' Hello '); Finding elements by ID
Hello.classname= ' declared ';

var Empty=document.getelementbyid (' empty ');
AddNode (Empty, "reader of");
AddNode (Empty, "Ajax in action!");

var children=empty.childnodes;
for (Var i=0;i<children.length;i++) {
Children[i].classname= ' programmed ';
}

Empty.style.border= ' solid green 2px '; Set the style directly for the node
Empty.style.width= "200px";
}

function AddNode (el,text) {
var childel=document.createelement ("div"); Create a new element
El.appendchild (Childel);
var txtnode=document.createtextnode (text); Creating text elements
Childel.appendchild (Txtnode);
}
</script>
<body>
<p id= "Hello" >Hello</p>
<div id= "Empty" ></div>
</body>
This example is the use of JavaScript to control the DOM, in the page to write content and the content of the page is decorated with CSS.

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