1 <head>
2 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
3 <title>无标题文档</title>
4 <style type="text/css">
5 *{margin:0px auto; padding:0px;}
6 #wai{width:200px; height:20px; margin-top:100px; border:1px solid #666;}
7 #nei{width:0%; height:20px; background-color:#F00; float:left;}
8 </style>
9 </head>
10
11 <body>
12 <div id="wai">
13 <div id="nei"></div>
14 </div>
15 <input type="button" value="开始" onclick="zou()"/>
16 </body>
17 <script type="text/javascript">
18 var a=0;
19 function zou(){
20 if(a<100){
21 a++;
22 }
23 document.getElementById("nei").style.width =a+"%";
24 window.setTimeout("zou()",5);
25 }
26 </script>
27 </html>
