Day10----------alphaPic

 //----------使用opacity属性完成对图片透明度渐变的效果
 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">
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 5 <title></title>
 6 </head>
 7 <style type="text/css">
 8     img{height: 500px; 800px;margin: 20px 100px;filter:alpha(opacity:30);opacity: 0.3;}
 9 </style>
10 <script type="text/javascript">
11     window.onload=function(){
12         var degree=0.3;
13         oImg=document.getElementsByTagName('img')[0];
14         oImg.onmouseover=function(){
15             setInterval(function(){
16                 degree+=0.05;
17                 oImg.style.opacity=degree;//NIE;
18                 oImg.style.filter="alpha(opacity:"+degree*100+")";//IE
19             },50);            
20         }
21     }
22 </script>
23 <body>
24     <div><img src="pic/alpha.jpg"></div>
25 </body>
26 </html>