js实时显示系统时间

刚刚在做后台页面最上面要动态显示时间刚写了这个代码

将这段代码加入<head></head>

<!--时间显示代码 -->
<script>
function clockon(contentDate){    
var now = new Date();    
var year = now.getYear();    
var month = now.getMonth();    
var date = now.getDate();    
var day = now.getDay();    
var hour = now.getHours();    
var minu = now.getMinutes();    
var sec = now.getSeconds();   
var week;     
month = month+1;    
if(month<10)month="0"+month;    
if(date<10)date="0"+date;    
if(hour<10)hour="0"+hour;    
if(minu<10)minu="0"+minu;    
if(sec<10)sec="0"+sec;    
//var arr_week = new Array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday");     
//week = arr_week[day];    这里显示星期几,我不用所以注释掉了
var time = "";    
time = year+"-"+month+"-"+date+"&nbsp;"+hour+":"+minu+":"+sec;

//time = year+"-"+month+"-"+date+"week"+hour+":"+minu+":"+sec;   如果需要显示周几的话可以用这句代码
if(document.all){        
 contentDate.innerHTML=""+time+""    }    
var timer = setTimeout("clockon(contentDate)",200);            
}</script>
<!--时间显示代码 -->

需要显示时间的地方代码如下:<div align="right" id="contentDate" ></div>

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