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 .a
6 {
7 width:15px;
8 height:25px;}
9 #b1
10 {
11 background-color:#F00;}
12 #b1:hover
13 {
14 background-color:#00F;
15 width:55px;}
16 #b2
17 {
18 background-color:#CF0;}
19 #b2:hover
20 {
21 background-color:#0F0;
22 width:55px;}
23 #b3
24 {
25 background-color:#F0F;}
26 #b3:hover
27 {
28 background-color:#600;
29 width:55px;}
30 </style>
31 </head>
32 <body>
33 <div class="a" id="b1"></div>
34 <div class="a" id="b2"></div>
35 <div class="a" id="b3"></div>
36 </body
时间： 2024-12-24 23:43:29