ejemplo practico JavaScript: Reloj



<script language="JavaScript">



<!--

var timerID = null;

var timerRunning = false;



function stopclock (){

        if(timerRunning)

                clearTimeout(timerID);

        timerRunning = false;

}



function showtime () {

        var now = new Date();

        var hours = now.getHours();

        var minutes = now.getMinutes();

        var seconds = now.getSeconds()

        var timeValue = "" + ((hours >12) ? hours -12 :hours)

        timeValue += ((minutes <10) ? ":0" : ":") + minutes

        timeValue += ((seconds < 10) ? ":0" : ":") + seconds

        timeValue += (hours >= 12) ? " p.m." : " a.m."

        document.clock.face.value = timeValue;

        timerID = setTimeout("showtime()",1000);

        timerRunning = true;

}



function startclock () {

        stopclock();

        showtime();

}

//-->



</script>
copyleft 2002: Gerald Kogler