javascript 显示当前系统时间代码

　　<script language=JavaScript>

　　var timerID = null;

　　var timerRunning = false;

　　function stopclock (){

　　if(timerRunning)

　　clearTimeout(timerID);

　　timerRunning = false;}

　　function startclock () {

　　stopclock();

　　showtime();}

　　function showtime () {

　　var now = new Date();

　　var hours = now.getHours();

　　var minutes = now.getMinutes();

　　var seconds = now.getSeconds()

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

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

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

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

　　document.clock.thetime.value = timeValue;

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

　　timerRunning = true;}

　　</SCRIPT>