js动态显示指定的时间

<p id="timeShow">17:0:50</p>

<script>

setInterval("time()", 1000);

 function time()
 {
	 var time=$("#timeShow").html();
     var timeArr= new Array(); //定义一数组
     timeArr=time.split(":"); //字符分割

	 sec=Number(timeArr[2])+Number(1);

	 var d = new Date()
	 d.setHours(timeArr[0],timeArr[1],sec);

	 var hours=d.getHours();
     var minutes=d.getMinutes();
	 var sec=d.getSeconds();

	 var timeStr=hours+":"+minutes+":"+sec;
	 $("#timeShow").html(timeStr);

 } 

</script>