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var http_request=false;
function on_search()
{
var content = document.getElementById("searchname").value;

if( content != "" )
document.getElementById("searchresult").innerHTML="ÕýÔÚËÑË÷...";
else
document.getElementById("searchresult").innerHTML="";

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http_request=false;
//¿ªÊ¼³õʼ»¯XMLHttpRequest¶ÔÏó
if(window.XMLHttpRequest)//Mozillaä¯ÀÀÆ÷
{
http_request=new XMLHttpRequest();
if(http_request.overrideMimeType)
{//ÉèÖÃMIMEÀà±ð
http_request.overrideMimeType("text/xml");
}
}
else if(window.ActiveXObject)//IEä¯ÀÀÆ÷
{
try
{
http_request=new ActiveXObject("Msxml2.XMLHttp");
}
catch(e)
{
try
{
http_request=new ActiveXobject("Microsoft.XMLHttp");
}
catch(e){}
}
}
//Òì³££¬´´½¨¶ÔÏóʵÀýʧ°Ü
if(!http_request)
{
document.getElementById("searchresult").innerHTML="<font color=red>Fault error:´´½¨XMLHttp¶ÔÏóʧ°Ü£¡</font>";
return false;
}

//ÔÚURLÌí¼ÓËæ»úÊý·ÀÖ¹ä¯ÀÀÆ÷cacheÒ³Ãæ
var posturl= "Ajax_test.php?keyword=" + encodeURIComponent(content) + "&random=" + Math.random()*(10000)


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function getReturnAjax{
  $.ajax({
    type:"POST",
    url:"ajax/userexist.aspx",
    data:"username="+vusername.value,
    success:function(msg){
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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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