[JaVaScRiPt] 페이지 로딩 시간

<script Language="JavaScript">
var from_time = new Date();
     from_time = from_time.getTime();   

function  show_loading_time(){
       var to_time = new Date();
            to_time = to_time.getTime();
       var secs = (to_time - from_time) /1000;
            document.write("<font size=2>loading : " + secs + "sec</font>");
}
</script>