class写法[tip] 

 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4     <title>test</title>
 5     <style type="text/css">
 6         
 7         .red{
 8             color: red;
 9         }
10 
11         .red.big{
12             font-size: 20em;
13         }
14 
15         .red#small{
16             font-size: 1em;
17         }
18     </style>
19 </head>
20 <body>
21     <h1 class="red ok big" id="small">你好！</h1>
22 </body>
23 </html>

 

posted @ 2015-03-17 21:31  z s k  阅读(515)  评论(0)  编辑  收藏  举报