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Îļþ1.ajax_page.php
<script type="text/javascript" language="javascript">
 function createXMLHttp()
 {
  var browser=navigator.appName; //get the current browser
  if(browser=="Microsoft Internet Explorer")
  {
   xmlHttp=new ActiveXObject("Microsoft.XMLHttp"); //if is IE
  }
  else xmlHttp=new XMLHttpRequest();
 }
 function changePage(url)
 {
  xmlHttp.onreadystatechange=newPage;
  xmlHttp.open("GET",url,true);
  xmlHttp.send(null);
 }
 function newPage()
 {
  if(xmlHttp.readyState==4)
  {
   if(xmlHttp.status==200)
   {
    document.getElementById("newPage").innerHTML=xmlHttp.responseText;
   }
  }
 }
 function doPage(url)
 {
  var xmlHttp=false;
  createXMLHttp();
  document.getElementById("newPage").innerHTML="ÕýÔÚ¶ÁÈ¡Êý¾Ý...";
  changePage(url);
 }
</script>
<style type="text/css">
#pageWay{
 background-color:#b5d6e6; background-image:url("tab_19.gif");  width:100%; font-size:15px; padding:5px;
}
span{
 color:red; font-weight:700;
}
.one{
  width:37px; height:15px;
}
.two{
 width:43px; height:15px;
}
img{
 border:0px;
}
</style>
<div id="newPage">
<?php
  include "database.class.php";
  include "page.class.php";
  $db=new database();
  $data_sql="SELECT `exptime`,`realdat`,`predat` from `labrec`";
   $data_res=$db->query($data_sql) or die($db->error());
   $data_nums=$db->num_rows($data_res); //Çó³ö×ܵÄÊý¾ÝÌõÊý
   if($data_nums)
   {
 &nbs


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function getReturnAjax{
  $.ajax({
    type:"POST",
    url:"ajax/userexist.aspx",
    data:"username="+vusername.value,
    success:function(msg){
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Ajax(Asynchronous JavaScript and XML)ÊÇÒ»¸ö½áºÏÁËJava¼¼Êõ¡¢XML¡¢ÒÔ¼°JavaScriptµÄ±à³Ì¼¼Êõ£¬¿ÉÒÔÈÃÄã¹¹½¨»ùÓÚJava¼¼ÊõµÄWebÓ¦Ó㬲¢´òÆÆÁËʹÓÃÒ³ÃæÖØÔØµÄ¹ßÀý¡£
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Ajax ÓÉ HTML¡¢JavaScript™ ¼¼Êõ¡¢DHTML ºÍ DOM ×é³É£¬ÕâÒ»½Ü³öµÄ·½·¨¿ÉÒÔ½«±¿×¾µÄ Web ½çÃæ×ª»¯³É½»»¥Ð﵀ Ajax Ó¦ÓóÌÐò¡£±¾ÎĵÄ×÷ÕßÊÇһλ Ajax ר¼Ò£¬ËûÑÝʾÁËÕâЩ¼¼ÊõÈçºÎЭͬ¹¤×÷ —— ´Ó×ÜÌå¸ÅÊöµ½Ï¸½ÚµÄÌÖÂÛ —— ʹ¸ßЧµÄ Web ¿ª·¢³ÉΪÏÖʵ¡£Ëû»¹½Ò¿ªÁË Ajax ºËÐĸÅÄîµÄÉñÃØÃæÉ´£¬°üÀ¨ ......

AJAXºÍXMLHTTPÔ­Àí

AjaxµÄÔ­Àí¼òµ¥À´ËµÍ¨¹ýXmlHttpRequest¶ÔÏóÀ´Ïò·þÎñÆ÷·¢Òì²½ÇëÇ󣬴ӷþÎñÆ÷»ñµÃÊý¾Ý£¬È»ºóÓÃjavascriptÀ´²Ù×÷DOM¶ø¸üÐÂÒ³Ãæ¡£ÕâÆäÖÐ×î¹Ø¼üµÄÒ»²½¾ÍÊÇ´Ó·þÎñÆ÷»ñµÃÇëÇóÊý¾Ý¡£ÒªÇå³þÕâ¸ö¹ý³ÌºÍÔ­Àí£¬ÎÒÃDZØÐë¶Ô XMLHttpRequestÓÐËùÁ˽⡣
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Google AJAX ÓïÑÔ API ·­Òë´úÂë

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <script type="text/javascript" src="http://www.google.com/jsapi"></script> ......
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