问怎么转ajax？

if(!isset($_SESSION['authcode'])){

$data["host"]=$_SERVER["HTTP_HOST"];

$data["auth"]=authcode;

$query_en = curl_get("http://xxx.xxxx.com/query.php?data=".base64_encode(des_enjson(json_encode($data))));

$query=json_decode(des_dejson($query_en),true);

if (is_array($query)) {

if ($query["code"] == 1) {

$_SESSION["authcode"] = authcode;

}else{

sysmsg("<h3>".$query["msg"]."</h3>", true);

}

}else{

sysmsg("<h3>检测到客户端环境异常，授权服务器拒绝连接！</h3>", true);

}

}

怎么转ajax求个大佬帮忙