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£¨1£©Xmlhttprequest AJAXÖ®ºËÐÄ
function S_Xmlhttprequest(){
if(window.ActiveXObject) //IE
xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
else if(window.XmlHTTPRequest) //·ÇIE
xmlhttp = XmlHTTPRequest();
}
£¨2£©AJAXº¯Êý£¬Ò²¾ÍÊÇÔÚHTMLÖÐonblur=ajax()µÄº¯Êý
function ajax(){
/*
if(form1.textfield.value == ''){
document.getElementById('div1').innerHTML = "ÇëÊäÈëÓû§Ãû";
return false;
}
*/
S_Xmlhttprequest(); //µ÷ÓÃXmlhttprequest
var f = document.form1.textfield.value;
xmlhttp.onreadystatechange = show; //onreadyStateChangeʼþ¿ÉÖ¸¶¨Ò»¸öʼþ´¦Àíº¯ÊýÀ´´¦ÀíXMLHttpRequest¶ÔÏóµÄÖ´Ðнá¹û
xmlhttp.open('GET','for.php?id='+f,true);
xmlhttp.send(null);
}
£¨3£©ajax()µ÷ÓõÄshow()·½·¨£¬¾ÍÊǶÔreadyState¸÷ÖÖ²»Í¬×´Ì¬²ÉÓò»Í¬ÐÐΪµÄ·½·¨
 function show(){
if(xmlhttp.readyState == 1)
document.getElementById('div1').innerHTML = "<img src="loading.gif" mce_src="loading.gif">";
else if(xmlhttp.readyState == 4){
var result = xmlhttp.responseText;
document.getElementById('div1').innerHTML = result;
}
}
readyStateµÄ4ÖÖ״̬£º
0 £­ £¨Î´³õʼ»¯£©»¹Ã»Óе÷ÓÃsend()·½·¨
1 £­ £¨ÔØÈ룩Òѵ÷ÓÃsend()·½·¨£¬ÕýÔÚ·¢ËÍÇëÇó
2 £­ £¨ÔØÈëÍê³É£©send()·½·¨Ö´ÐÐÍê³É£¬ÒѾ­½ÓÊÕµ½È«²¿ÏìÓ¦ÄÚÈÝ
3 £­ £¨½»»¥£©ÕýÔÚ½âÎöÏìÓ¦ÄÚÈÝ
4 £­ £¨Íê³É£©ÏìÓ¦ÄÚÈݽâÎöÍê³É£¬¿ÉÒÔÔÚ¿Í»§¶Ëµ÷ÓÃÁË
 
responseText()·½·¨ÔÚÎÒ¿´À´£¬Ó¦¸ÃÊÇ·µ»ØPHPÎļþÊä³öµÄÄÚÈÝ¡£
 
 
 
×îºó¸½ÉÏÄǸöfor.phpµÄÄÚÈÝ£º
<?
@header("content-Type: text/html; charset=gb2312");
include("MyDb.php");
$db = new MyDb($DB_LOCATION,$DB_USER,$DB_PWD);
$db->select_db('student');
if($user = $_GET['id']){
if( strlen($user)<6 || strlen($user)>12){
echo "<img src="error.gif" mce_src="error.gif"/><font color=red size=2>³¤¶È²»·ûºÏ</font>";
exit();
}
$zz = "^[_a-zA-Z0-9]+([_]?[a-zA-Z0-9]+)$";
if(!ereg($zz,$user)){
echo "


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Ajax ÊÖдJS

var httpRequest = false;
var mesdivs = null
function sendRequest(url, mesdiv) {
 
    mesdivs = mesdiv;
    httpRequest = false;
    if (window.XMLHttpRequest) {
        httpRequest = new XMLHttpRequest();
......
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