Çó¾Èphp+ajaxÑéÖ¤ - PHP / »ù´¡±à³Ì

ajax.js
var xmlHttp;

function CreateXMLHttpRequest(){
if(window.XMLHttpRequest){
//Mozilla ä¯ÀÀÆ÷
xmlHttp=new XMLHttpRequest();
}else if(window.ActiveXObject){
//IEä¯ÀÀÆ÷
try{
xmlHttp=new ActiveXObject("Msxml2.XMLHttp");
}
catch(e){
try{
cmlHttp=new ActiveXObject("Microsoft.XMLHttp");
}catch(e){}
}
}
if(xmlHttp==null){
alert("²»ÄÜ´´½¨XMLHttpRequest¶ÔÏó");
return false;
}
}
function sendAsynchronRequest(url,parameter,callback){
//´´½¨Ò»¸öXMLHttpRequest¶ÔÏó
createXMLHttpRequest();
if(parameter==null){
//ÉèÖÃXMLHttpRequest¶ÔÏóµÄÊôÐÔ²ÎÊý
//ÉèÖÃonreadystatechange
//±£´æÒ»¸ö»Øµ÷º¯ÊýÖ¸Õë
xmlHttp.onreadystatechange=callback;
//ÉèÖöԷþÎñÆ÷µ÷ÓõIJÎÊý
xmlHttp.open("GET",url,true);
//µ÷ÓÃsend·½·¨¾Í»áÏò·þÎñÆ÷¶Ë·¢ÆðÒ»¸öÒì²½ÇëÇó
//È¥·ÃÎÊÓÉURLÖ¸¶¨µÄ×ÊÔ´
xmlHttp.sned(null);
//·þÎñÆ÷¶Ï´¦ÀíÍêÇëÇóºó¿ªÊ¼·µ»Øresponse
//²¢ÓÉXMLHttpRequest¶ÔÏó¿ªÊ¼½ÓÊÕ
}else{
xmlHttp.onreadystatechange=callback;
xmlHttp.open("POST",url,true);
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");
//²ÎÊý·ÅÖÃÔÚÇëÇóÌå
xmlHttp.send(parameter);
}
}

check.js
function checkname(){
var url="check.php";
var