javascript实现简易数码时钟

<div id="clock">
 <p></p>
 <p></p>
 <p></p>
</div>

 *{margin:0;padding:0;}
 #clock{width:300px;height:150px;position: relative;margin:50px auto;background: #eeeeee;cursor: default;}
 #clock p{margin-top:5px;width:300px;height: 40px;text-align: center;
 font:italic bold 36px/40px arial,sans-serif;letter-spacing: 3px;color:blueviolet;}

window.onload = function ()
 {
 var oDiv = document.getElementById('clock');
 var aP = oDiv.getElementsByTagName('p');
 setInterval(clock,1000);
 function clock()
 {
 var oDate = new Date(); //创建日期对象
 var date = oDate.getFullYear()+'-'+ convert(oDate.getMonth()+1) +'-'+ convert(oDate.getDate());
 var time = convert(oDate.getHours()) +':'+convert(oDate.getMinutes()) + ':' +convert(oDate.getSeconds());
 aP[0].innerHTML = date;
 aP[1].innerHTML = time;
 aP[2].innerHTML = '星期' + convertWeek(oDate.getDay());
 }
 clock(); //加载完页面后立刻执行一次,不用等1秒后才显示
 };

 //把一位数字转换为两位字符串，补0
 function convert(num)
 {
 return num < 9?'0'+num:''+num;
 }
 //把week转换为中文
 function convertWeek(num)
 {
 return num==0?'日':num==1?'一':num==2?'二':num==3?'三':num==4?'四':num==5?'五':'六';
 }