a标签超链接点击后无虚边框

 1 a{  
 2 
 3     cursor:pointer;  
 4 
 5   text-decoration:none;  
 6 
 7 hide-focus: expression(this.hideFocus=true);  
 8 
 9 outline:none;  
10 
11 }  
12 
13 a:link,a:visited,a:hover,a:active{  
14 
15    text-decoration:none;  
16 
17 }    
18 
19 a:focus{  
20 
21    outline:0;   
22 
23 }