ajax 예제

function ajax_call() {
        if (window.XMLHttpRequest) {
                // code for IE7+, Firefox, Chrome, Opera, Safari
                xmlhttp=new XMLHttpRequest();
        } else {
                // code for IE6, IE5
                xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }

        xmlhttp.onreadystatechange=function() {
                if(xmlhttp.readyState==4 && xmlhttp.status==200) {
                        var resp = xmlhttp.responseText;
                        alert(resp);
                }
        }

        // Method, URL, 비동기처리
        xmlhttp.open("GET", url, true);
        xmlhttp.send(null);

        // Post 방식은 다음과 같이 사용.
        //xmlhttp.open("POST", url, true);
        //xmlhttp.send(param);
}