尝试使用此CSS：

  a：active，a：selected，a：visited {
 border：none; 
 outline：none; 
} 
 

注意，这必须在任何 hover 规则。感谢 PEra 在建议使用 a：selected 的意见中，

/ em>在IE 9中工作。删除a：选择导致它在IE9中工作。

Active hyperlink texts are highlighted with dotted border. When using effects on such hyperlinks (fadeIn/fadeOut) it produces strange effects. How do I disable/remove the dotted border?

Try this CSS:

a:active, a:selected, a:visited { 
    border: none;
    outline: none;
}

Note that this has to be after any a:hover rules. Thanks to PEra in the comments for suggesting using the a:selected selector as well.

NOTE

The above does not work in IE 9. Removing a:selected causes it to work in IE9.