css链接

 1 a:link{
 2     color:#FF0000;
 3 }
 4 a:visited{
 5     color:#00FF00;
 6 }
 7 a:hover {
 8     color:#0000FF;
 9 }
10 a:active{
11     color:#0000FF;
12 }

 1 a:link{
 2     color:#FF0000;
 3     text-decoration: none;
 4     background-color:aqua;: 
 5 }
 6 a:visited{
 7     color:#00FF00;
 8 }
 9 a:hover {
10     color:#0000FF;
11 }
12 a:active{
13     color:#0000FF;
14 }