Ferris教程学习笔记:js示例3.8 简易网页时钟

 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml"><head>
 3 <meta http-equiv="Content-Type" content="text/html; charset=gbk">
 4 <title>简易网页时钟</title>
 5 <style type="text/css">
 6 body,div{margin:0;padding:0;}
 7 body{color:#fff;font:16px/1.5 5fae8f6f96c59ed1;}
 8 #clock{width:300px;text-align:center;background:#1a1a1a;margin:10px auto;padding:20px 0;}
 9 span{color:#000;width:80px;line-height:2;background:#fbfbfb;border:2px solid #b4b4b4;margin:0 10px;padding:0 10px;}
10 
11 </style>
12 </head>
13 <body>
14  <div id="clock">
15    <span>1</span>点
16    <span>1</span>分
17    <span>1</span>秒
18  </div>
19 <script type="text/javascript">
20  window.onload = function(){
21    var spans = document.getElementById("clock").getElementsByTagName("span");
22    
23    //第一种方式,直接创建对象，获取时分秒，赋值即可
24    //function getTime(){
25     // var now = new Date();
26     // spans[0].innerHTML = now.getHours();
27     // spans[1].innerHTML = now.getMinutes();
28     // spans[2].innerHTML = now.getSeconds();
29    //}
30    //setInterval(getTime,1000);
31    function getTime(){
32      var now = new Date();
33      var aList = [now.getHours(),now.getMinutes(),now.getSeconds()];
34      for(p in aList)spans[p].innerHTML = format(aList[p]);
35    }
36    getTime();
37    setInterval(getTime,1000);
38    function format(a){
39      return a.toString().replace(/^(d)$/,"0$1");
40    }
41  }
42 </script> 
43 </body>
44 </html>